Android Java 桌面功能示例

// Android Java Message Box Examples
// Using AlertDialog for various dialog types

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.widget.EditText;
import android.widget.LinearLayout;
import android.text.InputType;
import android.view.LayoutInflater;
import android.view.View;

// 1. Alert Dialog Builder
public class MessageBoxHelper {
    private Activity activity;

    public MessageBoxHelper(Activity activity) {
        this.activity = activity;
    }

    // Simple alert dialog
    public void showAlert(String title, String message) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                System.out.println("OK clicked");
            }
        });
        builder.setCancelable(false);
        builder.show();
    }

    // Alert with callback
    public void showAlertWithCallback(String title, String message, final OnDialogClickListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onPositiveClick();
                }
            }
        });
        builder.show();
    }

    // Confirmation dialog
    public void showConfirmation(String title, String message, final OnConfirmListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onConfirm(true);
                }
            }
        });
        builder.setNegativeButton("No", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onConfirm(false);
                }
            }
        });
        builder.setCancelable(false);
        builder.show();
    }

    // Three-button dialog
    public void showThreeButtonDialog(String title, String message,
                                      String positiveText, String negativeText, String neutralText,
                                      final OnThreeButtonListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.setPositiveButton(positiveText, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onPositiveClick();
                }
            }
        });
        builder.setNegativeButton(negativeText, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onNegativeClick();
                }
            }
        });
        builder.setNeutralButton(neutralText, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onNeutralClick();
                }
            }
        });
        builder.show();
    }

    // Input dialog
    public void showInputDialog(String title, String hint, final OnInputListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);

        final EditText input = new EditText(activity);
        input.setHint(hint);
        input.setInputType(InputType.TYPE_CLASS_TEXT);
        builder.setView(input);

        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onInput(input.getText().toString());
                }
            }
        });
        builder.setNegativeButton("Cancel", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.cancel();
            }
        });

        builder.show();
    }

    // Number input dialog
    public void showNumberInputDialog(String title, String hint, final OnInputListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);

        final EditText input = new EditText(activity);
        input.setHint(hint);
        input.setInputType(InputType.TYPE_CLASS_NUMBER | InputType.TYPE_NUMBER_FLAG_SIGNED);
        builder.setView(input);

        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onInput(input.getText().toString());
                }
            }
        });
        builder.setNegativeButton("Cancel", null);

        builder.show();
    }

    // Multi-choice dialog
    public void showMultiChoiceDialog(String title, final String[] items,
                                      final boolean[] checkedItems,
                                      final OnMultiChoiceListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);
        builder.setMultiChoiceItems(items, checkedItems,
            new DialogInterface.OnMultiChoiceClickListener() {
                @Override
                public void onClick(DialogInterface dialog, int which, boolean isChecked) {
                    checkedItems[which] = isChecked;
                }
            });
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onItemsSelected(checkedItems);
                }
            }
        });
        builder.setNegativeButton("Cancel", null);
        builder.show();
    }

    // Single-choice dialog
    public void showSingleChoiceDialog(String title, final String[] items, int checkedItem,
                                      final OnSingleChoiceListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);
        builder.setSingleChoiceItems(items, checkedItem, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onItemSelected(which);
                }
            }
        });
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
            }
        });
        builder.show();
    }

    // List dialog
    public void showListDialog(String title, final String[] items, final OnItemClickListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle(title);
        builder.setItems(items, new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onItemClick(which);
                }
            }
        });
        builder.show();
    }

    // Progress dialog
    public void showProgressDialog(String title, String message) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        LayoutInflater inflater = activity.getLayoutInflater();
        View dialogView = inflater.inflate(android.R.layout.simple_list_item_1, null);
        builder.setView(dialogView);
        builder.setTitle(title);
        builder.setMessage(message);
        builder.setCancelable(false);
        builder.show();
    }

    // Custom dialog with layout
    public void showCustomDialog(String title, int layoutRes, final OnCustomDialogListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        LayoutInflater inflater = activity.getLayoutInflater();
        View dialogView = inflater.inflate(layoutRes, null);

        builder.setTitle(title);
        builder.setView(dialogView);
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onCustomView(dialogView);
                }
            }
        });
        builder.setNegativeButton("Cancel", null);
        builder.show();
    }
}

// 2. Dialog Callback Interfaces
interface OnDialogClickListener {
    void onPositiveClick();
    void onNegativeClick();
}

interface OnConfirmListener {
    void onConfirm(boolean confirmed);
}

interface OnThreeButtonListener {
    void onPositiveClick();
    void onNegativeClick();
    void onNeutralClick();
}

interface OnInputListener {
    void onInput(String input);
}

interface OnMultiChoiceListener {
    void onItemsSelected(boolean[] checkedItems);
}

interface OnSingleChoiceListener {
    void onItemSelected(int which);
}

interface OnItemClickListener {
    void onItemClick(int which);
}

interface OnCustomDialogListener {
    void onCustomView(View customView);
}

// 3. Predefined Dialogs
public class CommonDialogs {
    private Activity activity;
    private MessageBoxHelper messageBox;

    public CommonDialogs(Activity activity) {
        this.activity = activity;
        this.messageBox = new MessageBoxHelper(activity);
    }

    // Error dialog
    public void showError(String message) {
        messageBox.showAlert("Error", message);
    }

    // Warning dialog
    public void showWarning(String message) {
        messageBox.showAlert("Warning", message);
    }

    // Info dialog
    public void showInfo(String message) {
        messageBox.showAlert("Information", message);
    }

    // Success dialog
    public void showSuccess(String message) {
        messageBox.showAlert("Success", message);
    }

    // Confirm delete
    public void confirmDelete(final OnConfirmListener listener) {
        messageBox.showConfirmation("Confirm Delete",
            "Are you sure you want to delete this item?",
            listener);
    }

    // Confirm save
    public void confirmSave(final OnConfirmListener listener) {
        messageBox.showConfirmation("Confirm Save",
            "Do you want to save changes?",
            listener);
    }

    // Confirm exit
    public void confirmExit(final OnConfirmListener listener) {
        messageBox.showConfirmation("Confirm Exit",
            "Are you sure you want to exit?",
            listener);
    }

    // Input name
    public void inputName(final OnInputListener listener) {
        messageBox.showInputDialog("Enter Name", "Name", listener);
    }

    // Input email
    public void inputEmail(final OnInputListener listener) {
        messageBox.showInputDialog("Enter Email", "[email protected]", listener);
    }

    // Input password
    public void inputPassword(final OnInputListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle("Enter Password");

        final EditText input = new EditText(activity);
        input.setHint("Password");
        input.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
        builder.setView(input);

        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                if (listener != null) {
                    listener.onInput(input.getText().toString());
                }
            }
        });
        builder.setNegativeButton("Cancel", null);
        builder.show();
    }
}

// 4. Toast Messages
public class ToastHelper {
    private Activity activity;

    public ToastHelper(Activity activity) {
        this.activity = activity;
    }

    // Short toast
    public void showShort(String message) {
        android.widget.Toast.makeText(activity, message, android.widget.Toast.LENGTH_SHORT).show();
    }

    // Long toast
    public void showLong(String message) {
        android.widget.Toast.makeText(activity, message, android.widget.Toast.LENGTH_LONG).show();
    }

    // Custom position toast
    public void showAtPosition(String message, int gravity, int xOffset, int yOffset) {
        android.widget.Toast toast = android.widget.Toast.makeText(activity, message, android.widget.Toast.LENGTH_SHORT);
        toast.setGravity(gravity, xOffset, yOffset);
        toast.show();
    }
}

// 5. Snackbar Messages (requires design library)
public class SnackbarHelper {
    private Activity activity;

    public SnackbarHelper(Activity activity) {
        this.activity = activity;
    }

    // Note: This requires com.google.android.material.snackbar.Snackbar
    // For simplicity, we'll use Toast as fallback
    public void show(String message) {
        // In real implementation, use Snackbar
        android.widget.Toast.makeText(activity, message, android.widget.Toast.LENGTH_LONG).show();
    }

    public void showWithAction(String message, String actionText) {
        // In real implementation:
        // Snackbar.make(view, message, Snackbar.LENGTH_LONG)
        //     .setAction(actionText, clickListener).show();
        android.widget.Toast.makeText(activity, message + " (" + actionText + ")", android.widget.Toast.LENGTH_LONG).show();
    }
}

// 6. Dialog with Custom View
public class CustomDialogHelper {
    private Activity activity;

    public CustomDialogHelper(Activity activity) {
        this.activity = activity;
    }

    // Create dialog with username and password fields
    public void showLoginDialog(final OnLoginListener listener) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle("Login");

        LinearLayout layout = new LinearLayout(activity);
        layout.setOrientation(LinearLayout.VERTICAL);
        layout.setPadding(50, 40, 50, 10);

        final EditText usernameInput = new EditText(activity);
        usernameInput.setHint("Username");
        layout.addView(usernameInput);

        final EditText passwordInput = new EditText(activity);
        passwordInput.setHint("Password");
        passwordInput.setInputType(InputType.TYPE_CLASS_TEXT | InputType.TYPE_TEXT_VARIATION_PASSWORD);
        layout.addView(passwordInput);

        builder.setView(layout);

        builder.setPositiveButton("Login", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
                String username = usernameInput.getText().toString();
                String password = passwordInput.getText().toString();
                if (listener != null) {
                    listener.onLogin(username, password);
                }
            }
        });
        builder.setNegativeButton("Cancel", null);

        builder.show();
    }
}

interface OnLoginListener {
    void onLogin(String username, String password);
}

// 7. Dialog Manager
public class DialogManager {
    private Activity activity;
    private MessageBoxHelper messageBox;
    private CommonDialogs commonDialogs;
    private ToastHelper toastHelper;

    public DialogManager(Activity activity) {
        this.activity = activity;
        this.messageBox = new MessageBoxHelper(activity);
        this.commonDialogs = new CommonDialogs(activity);
        this.toastHelper = new ToastHelper(activity);
    }

    // Show error with toast
    public void notifyError(String message) {
        commonDialogs.showError(message);
        toastHelper.showShort("Error occurred");
    }

    // Show success with toast
    public void notifySuccess(String message) {
        commonDialogs.showSuccess(message);
        toastHelper.showShort("Operation successful");
    }

    // Show loading
    public AlertDialog showLoadingDialog(String message) {
        AlertDialog.Builder builder = new AlertDialog.Builder(activity);
        builder.setTitle("Please Wait");
        builder.setMessage(message);
        builder.setCancelable(false);

        AlertDialog dialog = builder.show();
        return dialog;
    }
}

// Main demonstration
public class MessageBoxDemo {
    public static void demonstrateMessageBoxes(Activity activity) {
        System.out.println("=== Android Java Message Box Examples ===\n");

        MessageBoxHelper messageBox = new MessageBoxHelper(activity);
        CommonDialogs commonDialogs = new CommonDialogs(activity);
        ToastHelper toastHelper = new ToastHelper(activity);

        // 1. Simple alert
        System.out.println("--- 1. Simple Alert Dialog ---");
        messageBox.showAlert("Alert", "This is a simple alert message");

        // 2. Confirmation dialog
        System.out.println("\n--- 2. Confirmation Dialog ---");
        commonDialogs.confirmDelete(new OnConfirmListener() {
            @Override
            public void onConfirm(boolean confirmed) {
                if (confirmed) {
                    System.out.println("User confirmed deletion");
                } else {
                    System.out.println("User cancelled deletion");
                }
            }
        });

        // 3. Input dialog
        System.out.println("\n--- 3. Input Dialog ---");
        messageBox.showInputDialog("Enter Text", "Type something here", new OnInputListener() {
            @Override
            public void onInput(String input) {
                System.out.println("User entered: " + input);
            }
        });

        // 4. List dialog
        System.out.println("\n--- 4. List Dialog ---");
        final String[] colors = {"Red", "Green", "Blue", "Yellow", "Black"};
        messageBox.showListDialog("Choose a Color", colors, new OnItemClickListener() {
            @Override
            public void onItemClick(int which) {
                System.out.println("Selected color: " + colors[which]);
            }
        });

        // 5. Multi-choice dialog
        System.out.println("\n--- 5. Multi-Choice Dialog ---");
        final String[] toppings = {"Cheese", "Pepperoni", "Mushrooms", "Olives", "Onions"};
        final boolean[] checkedItems = {false, false, false, false, false};
        messageBox.showMultiChoiceDialog("Select Toppings", toppings, checkedItems,
            new OnMultiChoiceListener() {
                @Override
                public void onItemsSelected(boolean[] checkedItems) {
                    System.out.print("Selected toppings: ");
                    for (int i = 0; i < checkedItems.length; i++) {
                        if (checkedItems[i]) {
                            System.out.print(toppings[i] + " ");
                        }
                    }
                    System.out.println();
                }
            });

        // 6. Toast messages
        System.out.println("\n--- 6. Toast Messages ---");
        toastHelper.showShort("This is a short toast");
        toastHelper.showLong("This is a long toast message");

        // 7. Common dialogs
        System.out.println("\n--- 7. Common Dialogs ---");
        commonDialogs.showError("This is an error message");
        commonDialogs.showWarning("This is a warning message");
        commonDialogs.showInfo("This is an info message");
        commonDialogs.showSuccess("Operation completed successfully!");

        // 8. Custom dialog
        System.out.println("\n--- 8. Custom Dialog ---");
        CustomDialogHelper customDialog = new CustomDialogHelper(activity);
        customDialog.showLoginDialog(new OnLoginListener() {
            @Override
            public void onLogin(String username, String password) {
                System.out.println("Login attempt: " + username);
            }
        });

        System.out.println("\n=== All Message Box Examples Completed ===");
    }
}

// Android Java File Dialog Examples
// Using Android Intent and Storage Access Framework for file selection

import android.app.Activity;
import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;
import android.provider.DocumentsContract;
import android.provider.OpenableColumns;
import android.database.Cursor;
import android.webkit.MimeTypeMap;
import java.io.*;
import java.util.ArrayList;
import java.util.List;

// 1. File Picker Helper
public class FilePickerHelper {
    public static final int PICK_FILE_REQUEST = 1001;
    public static final int PICK_DIRECTORY_REQUEST = 1002;
    public static final int SAVE_FILE_REQUEST = 1003;

    private Activity activity;
    private OnFileSelectedListener fileSelectedListener;

    public interface OnFileSelectedListener {
        void onFileSelected(Uri fileUri);
        void onFilesSelected(List<Uri> fileUris);
        void onDirectorySelected(Uri directoryUri);
        void onCancelled();
    }

    public FilePickerHelper(Activity activity) {
        this.activity = activity;
    }

    public void setOnFileSelectedListener(OnFileSelectedListener listener) {
        this.fileSelectedListener = listener;
    }

    // Open single file picker
    public void openFilePicker(String mimeType) {
        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType(mimeType != null ? mimeType : "*/*");

        activity.startActivityForResult(intent, PICK_FILE_REQUEST);
    }

    // Open multiple files picker
    public void openMultipleFilesPicker(String mimeType) {
        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType(mimeType != null ? mimeType : "*/*");
        intent.putExtra(Intent.EXTRA_ALLOW_MULTIPLE, true);

        activity.startActivityForResult(Intent.createChooser(intent, "Select files"), PICK_FILE_REQUEST);
    }

    // Open directory picker (API 21+)
    public void openDirectoryPicker() {
        Intent intent = new Intent(Intent.ACTION_OPEN_DOCUMENT_TREE);
        activity.startActivityForResult(intent, PICK_DIRECTORY_REQUEST);
    }

    // Create file for saving
    public void createFile(String mimeType, String fileName) {
        Intent intent = new Intent(Intent.ACTION_CREATE_DOCUMENT);
        intent.addCategory(Intent.CATEGORY_OPENABLE);
        intent.setType(mimeType != null ? mimeType : "text/plain");
        intent.putExtra(Intent.EXTRA_TITLE, fileName);

        activity.startActivityForResult(intent, SAVE_FILE_REQUEST);
    }

    // Handle activity result
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        if (resultCode != Activity.RESULT_OK) {
            if (fileSelectedListener != null) {
                fileSelectedListener.onCancelled();
            }
            return;
        }

        switch (requestCode) {
            case PICK_FILE_REQUEST:
                handleFilePickerResult(data);
                break;
            case PICK_DIRECTORY_REQUEST:
                handleDirectoryPickerResult(data);
                break;
            case SAVE_FILE_REQUEST:
                handleSaveFileResult(data);
                break;
        }
    }

    private void handleFilePickerResult(Intent data) {
        if (data != null) {
            // Check for multiple files
            if (data.getClipData() != null) {
                List<Uri> uris = new ArrayList<>();
                int count = data.getClipData().getItemCount();
                for (int i = 0; i < count; i++) {
                    uris.add(data.getClipData().getItemAt(i).getUri());
                }
                if (fileSelectedListener != null) {
                    fileSelectedListener.onFilesSelected(uris);
                }
            } else if (data.getData() != null) {
                if (fileSelectedListener != null) {
                    fileSelectedListener.onFileSelected(data.getData());
                }
            }
        }
    }

    private void handleDirectoryPickerResult(Intent data) {
        if (data != null && data.getData() != null) {
            Uri treeUri = data.getData();
            // Persist permission
            final int takeFlags = data.getFlags() & Intent.FLAG_GRANT_READ_URI_PERMISSION;
            activity.getContentResolver().takePersistableUriPermission(treeUri, takeFlags);

            if (fileSelectedListener != null) {
                fileSelectedListener.onDirectorySelected(treeUri);
            }
        }
    }

    private void handleSaveFileResult(Intent data) {
        if (data != null && data.getData() != null) {
            if (fileSelectedListener != null) {
                fileSelectedListener.onFileSelected(data.getData());
            }
        }
    }
}

// 2. File Information
public class FileInfoExtractor {
    private Activity activity;

    public FileInfoExtractor(Activity activity) {
        this.activity = activity;
    }

    public static class FileInfo {
        public String name;
        public long size;
        public String mimeType;
        public Uri uri;

        public FileInfo(String name, long size, String mimeType, Uri uri) {
            this.name = name;
            this.size = size;
            this.mimeType = mimeType;
            this.uri = uri;
        }

        public void print() {
            System.out.println("File: " + name);
            System.out.println("Size: " + size + " bytes");
            System.out.println("Type: " + mimeType);
        }
    }

    // Get file info from URI
    public FileInfo getFileInfo(Uri uri) {
        String fileName = null;
        long fileSize = 0;
        String mimeType = activity.getContentResolver().getType(uri);

        Cursor cursor = activity.getContentResolver().query(uri, null, null, null, null);
        if (cursor != null && cursor.moveToFirst()) {
            int nameIndex = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
            int sizeIndex = cursor.getColumnIndex(OpenableColumns.SIZE);

            if (nameIndex != -1) {
                fileName = cursor.getString(nameIndex);
            }
            if (sizeIndex != -1) {
                fileSize = cursor.getLong(sizeIndex);
            }

            cursor.close();
        }

        return new FileInfo(fileName, fileSize, mimeType, uri);
    }

    // Get file name
    public String getFileName(Uri uri) {
        String result = null;
        if (uri.getScheme().equals("content")) {
            Cursor cursor = activity.getContentResolver().query(uri, null, null, null, null);
            try {
                if (cursor != null && cursor.moveToFirst()) {
                    int index = cursor.getColumnIndex(OpenableColumns.DISPLAY_NAME);
                    if (index != -1) {
                        result = cursor.getString(index);
                    }
                }
            } finally {
                if (cursor != null) {
                    cursor.close();
                }
            }
        }
        if (result == null) {
            result = uri.getLastPathSegment();
        }
        return result;
    }

    // Get file size
    public long getFileSize(Uri uri) {
        long size = 0;
        Cursor cursor = activity.getContentResolver().query(uri, null, null, null, null);
        try {
            if (cursor != null && cursor.moveToFirst()) {
                int index = cursor.getColumnIndex(OpenableColumns.SIZE);
                if (index != -1) {
                    size = cursor.getLong(index);
                }
            }
        } finally {
            if (cursor != null) {
                cursor.close();
            }
        }
        return size;
    }

    // Get MIME type
    public String getMimeType(Uri uri) {
        String mimeType = activity.getContentResolver().getType(uri);
        if (mimeType == null) {
            String extension = MimeTypeMap.getFileExtensionFromUrl(uri.toString());
            mimeType = MimeTypeMap.getSingleton().getMimeTypeFromExtension(extension.toLowerCase());
        }
        return mimeType;
    }
}

// 3. File Reader and Writer
public class FileIO {
    private Activity activity;

    public FileIO(Activity activity) {
        this.activity = activity;
    }

    // Read content from URI
    public String readTextFromUri(Uri uri) throws IOException {
        StringBuilder stringBuilder = new StringBuilder();
        try (InputStream inputStream = activity.getContentResolver().openInputStream(uri);
             BufferedReader reader = new BufferedReader(new InputStreamReader(inputStream))) {
            String line;
            while ((line = reader.readLine()) != null) {
                stringBuilder.append(line);
                stringBuilder.append("\n");
            }
        }
        return stringBuilder.toString();
    }

    // Read bytes from URI
    public byte[] readBytesFromUri(Uri uri) throws IOException {
        ByteArrayOutputStream byteBuffer = new ByteArrayOutputStream();
        try (InputStream inputStream = activity.getContentResolver().openInputStream(uri)) {
            int bufferSize = 1024;
            byte[] buffer = new byte[bufferSize];

            int len;
            while ((len = inputStream.read(buffer)) != -1) {
                byteBuffer.write(buffer, 0, len);
            }
        }
        return byteBuffer.toByteArray();
    }

    // Write text to URI
    public void writeTextToUri(Uri uri, String text) throws IOException {
        try (OutputStream outputStream = activity.getContentResolver().openOutputStream(uri)) {
            outputStream.write(text.getBytes());
        }
    }

    // Write bytes to URI
    public void writeBytesToUri(Uri uri, byte[] bytes) throws IOException {
        try (OutputStream outputStream = activity.getContentResolver().openOutputStream(uri)) {
            outputStream.write(bytes);
        }
    }

    // Copy file from URI to app storage
    public boolean copyToAppStorage(Uri sourceUri, String destinationFileName) {
        try {
            byte[] data = readBytesFromUri(sourceUri);

            FileOutputStream outputStream = activity.openFileOutput(destinationFileName, Activity.MODE_PRIVATE);
            outputStream.write(data);
            outputStream.close();

            System.out.println("File copied to: " + destinationFileName);
            return true;
        } catch (IOException e) {
            System.out.println("Error copying file: " + e.getMessage());
            return false;
        }
    }
}

// 4. File Type Filter
public class FileTypeFilter {

    public static class MimeTypeFilter {
        private String mimeType;
        private String[] extensions;

        public MimeTypeFilter(String mimeType, String[] extensions) {
            this.mimeType = mimeType;
            this.extensions = extensions;
        }

        public String getMimeType() {
            return mimeType;
        }

        public String[] getExtensions() {
            return extensions;
        }
    }

    // Common file type filters
    public static MimeTypeFilter imageFilter() {
        return new MimeTypeFilter("image/*", new String[]{"jpg", "jpeg", "png", "gif", "bmp", "webp"});
    }

    public static MimeTypeFilter videoFilter() {
        return new MimeTypeFilter("video/*", new String[]{"mp4", "avi", "mkv", "mov", "wmv"});
    }

    public static MimeTypeFilter audioFilter() {
        return new MimeTypeFilter("audio/*", new String[]{"mp3", "wav", "ogg", "flac", "aac"});
    }

    public static MimeTypeFilter textFilter() {
        return new MimeTypeFilter("text/*", new String[]{"txt", "csv", "json", "xml", "html", "md"});
    }

    public static MimeTypeFilter pdfFilter() {
        return new MimeTypeFilter("application/pdf", new String[]{"pdf"});
    }

    public static MimeTypeFilter documentFilter() {
        return new MimeTypeFilter("*/*", new String[]{"doc", "docx", "xls", "xlsx", "ppt", "pptx"});
    }

    // Create custom filter
    public static MimeTypeFilter customFilter(String mimeType, String[] extensions) {
        return new MimeTypeFilter(mimeType, extensions);
    }
}

// 5. Advanced File Operations
public class AdvancedFileOperations {
    private Activity activity;

    public AdvancedFileOperations(Activity activity) {
        this.activity = activity;
    }

    // List files in directory (from tree URI)
    public List<Uri> listDirectoryFiles(Uri directoryUri) {
        List<Uri> files = new ArrayList<>();

        Uri childrenUri = DocumentsContract.buildChildDocumentsUriUsingTree(directoryUri,
            DocumentsContract.getTreeDocumentId(directoryUri));

        Cursor cursor = activity.getContentResolver().query(
            childrenUri,
            new String[]{DocumentsContract.Document.COLUMN_DOCUMENT_ID},
            null, null, null);

        if (cursor != null) {
            while (cursor.moveToNext()) {
                String documentId = cursor.getString(0);
                Uri fileUri = DocumentsContract.buildDocumentUriUsingTree(directoryUri, documentId);
                files.add(fileUri);
            }
            cursor.close();
        }

        return files;
    }

    // Create subdirectory in directory
    public Uri createSubdirectory(Uri parentUri, String directoryName) {
        try {
            Uri newDirUri = DocumentsContract.createDocument(
                activity.getContentResolver(),
                parentUri,
                DocumentsContract.Document.MIME_TYPE_DIR,
                directoryName);
            return newDirUri;
        } catch (Exception e) {
            System.out.println("Error creating directory: " + e.getMessage());
            return null;
        }
    }

    // Delete file
    public boolean deleteFile(Uri fileUri) {
        try {
            return DocumentsContract.deleteDocument(activity.getContentResolver(), fileUri);
        } catch (Exception e) {
            System.out.println("Error deleting file: " + e.getMessage());
            return false;
        }
    }

    // Rename file
    public Uri renameFile(Uri fileUri, String newName) {
        try {
            return DocumentsContract.renameDocument(activity.getContentResolver(), fileUri, newName);
        } catch (Exception e) {
            System.out.println("Error renaming file: " + e.getMessage());
            return null;
        }
    }
}

// 6. File Picker with Preview
public class FilePickerWithPreview {
    private Activity activity;
    private FilePickerHelper filePicker;
    private FileInfoExtractor fileInfoExtractor;
    private FileIO fileIO;

    public FilePickerWithPreview(Activity activity) {
        this.activity = activity;
        this.filePicker = new FilePickerHelper(activity);
        this.fileInfoExtractor = new FileInfoExtractor(activity);
        this.fileIO = new FileIO(activity);
    }

    public void openImagePickerWithPreview() {
        filePicker.setOnFileSelectedListener(new FilePickerHelper.OnFileSelectedListener() {
            @Override
            public void onFileSelected(Uri fileUri) {
                FileInfoExtractor.FileInfo info = fileInfoExtractor.getFileInfo(fileUri);
                info.print();

                // Check if it's an image
                if (info.mimeType != null && info.mimeType.startsWith("image/")) {
                    System.out.println("Image file selected - can display preview");
                    // Load and display preview image here
                }
            }

            @Override
            public void onFilesSelected(List<Uri> fileUris) {
                System.out.println("Multiple files selected: " + fileUris.size());
                for (Uri uri : fileUris) {
                    FileInfoExtractor.FileInfo info = fileInfoExtractor.getFileInfo(uri);
                    System.out.println("  - " + info.name);
                }
            }

            @Override
            public void onDirectorySelected(Uri directoryUri) {
                System.out.println("Directory selected: " + directoryUri);
                AdvancedFileOperations ops = new AdvancedFileOperations(activity);
                List<Uri> files = ops.listDirectoryFiles(directoryUri);
                System.out.println("Files in directory: " + files.size());
            }

            @Override
            public void onCancelled() {
                System.out.println("File selection cancelled");
            }
        });

        filePicker.openFilePicker("image/*");
    }
}

// 7. File Picker Configuration
public class FilePickerConfig {
    public String mimeType = "*/*";
    public boolean allowMultiple = false;
    public String initialFileName = null;
    public String title = null;

    public static class Builder {
        private FilePickerConfig config;

        public Builder() {
            config = new FilePickerConfig();
        }

        public Builder setMimeType(String mimeType) {
            config.mimeType = mimeType;
            return this;
        }

        public Builder allowMultiple(boolean allow) {
            config.allowMultiple = allow;
            return this;
        }

        public Builder setInitialFileName(String fileName) {
            config.initialFileName = fileName;
            return this;
        }

        public Builder setTitle(String title) {
            config.title = title;
            return this;
        }

        public FilePickerConfig build() {
            return config;
        }
    }

    public static Builder builder() {
        return new Builder();
    }
}

// Main demonstration
public class FileDialogDemo {
    public static void demonstrateFileDialogs(Activity activity) {
        System.out.println("=== Android Java File Dialog Examples ===\n");

        // 1. Basic file picker
        System.out.println("--- 1. Basic File Picker ---");
        FilePickerHelper filePicker = new FilePickerHelper(activity);

        filePicker.setOnFileSelectedListener(new FilePickerHelper.OnFileSelectedListener() {
            @Override
            public void onFileSelected(Uri fileUri) {
                System.out.println("File selected: " + fileUri);
                FileInfoExtractor extractor = new FileInfoExtractor(activity);
                FileInfoExtractor.FileInfo info = extractor.getFileInfo(fileUri);
                info.print();
            }

            @Override
            public void onFilesSelected(List<Uri> fileUris) {
                System.out.println("Multiple files selected: " + fileUris.size());
            }

            @Override
            public void onDirectorySelected(Uri directoryUri) {
                System.out.println("Directory selected: " + directoryUri);
            }

            @Override
            public void onCancelled() {
                System.out.println("File selection cancelled");
            }
        });

        // Open text file picker
        filePicker.openFilePicker("text/*");

        // 2. Multiple files picker
        System.out.println("\n--- 2. Multiple Files Picker ---");
        filePicker.openMultipleFilesPicker("*/*");

        // 3. Directory picker
        System.out.println("\n--- 3. Directory Picker ---");
        filePicker.openDirectoryPicker();

        // 4. Create/save file
        System.out.println("\n--- 4. Create/Save File ---");
        filePicker.createFile("text/plain", "my_document.txt");

        // 5. File type filters
        System.out.println("\n--- 5. File Type Filters ---");

        // Image picker
        filePicker.openFilePicker(FileTypeFilter.imageFilter().getMimeType());

        // Video picker
        filePicker.openFilePicker(FileTypeFilter.videoFilter().getMimeType());

        // PDF picker
        filePicker.openFilePicker(FileTypeFilter.pdfFilter().getMimeType());

        // 6. Advanced operations
        System.out.println("\n--- 6. Advanced File Operations ---");
        AdvancedFileOperations advancedOps = new AdvancedFileOperations(activity);

        // These would be called after directory selection
        // List<Uri> files = advancedOps.listDirectoryFiles(directoryUri);
        // Uri newDir = advancedOps.createSubdirectory(directoryUri, "new_folder");
        // boolean deleted = advancedOps.deleteFile(fileUri);
        // Uri renamed = advancedOps.renameFile(fileUri, "new_name.txt");

        // 7. File I/O
        System.out.println("\n--- 7. File I/O ---");
        FileIO fileIO = new FileIO(activity);

        // Read from selected file
        // try {
        //     String content = fileIO.readTextFromUri(fileUri);
        //     System.out.println("File content: " + content);
        // } catch (IOException e) {
        //     System.out.println("Error reading file: " + e.getMessage());
        // }

        System.out.println("\n=== All File Dialog Examples Completed ===");
    }
}

// Android Java System Integration Examples
// Using NotificationManager and system integration features

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.BitmapFactory;
import android.os.Build;
import androidx.core.app.NotificationCompat;
import androidx.core.app.NotificationManagerCompat;
import android.widget.RemoteViews;

// 1. Notification Helper
public class NotificationHelper {
    private static final String CHANNEL_ID = "my_app_channel";
    private static final String CHANNEL_NAME = "My App Notifications";
    private static final String CHANNEL_DESC = "Notifications from My App";

    private Context context;
    private NotificationManager notificationManager;

    public NotificationHelper(Context context) {
        this.context = context;
        this.notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        createNotificationChannel();
    }

    // Create notification channel (required for API 26+)
    private void createNotificationChannel() {
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            NotificationChannel channel = new NotificationChannel(
                CHANNEL_ID,
                CHANNEL_NAME,
                NotificationManager.IMPORTANCE_DEFAULT
            );
            channel.setDescription(CHANNEL_DESC);
            channel.enableVibration(true);
            channel.setVibrationPattern(new long[]{1000, 1000});
            notificationManager.createNotificationChannel(channel);
        }
    }

    // Simple notification
    public void showSimpleNotification(int notificationId, String title, String message) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(message)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setAutoCancel(true);

        notificationManager.notify(notificationId, builder.build());
    }

    // Notification with tap action
    public void showNotificationWithAction(int notificationId, String title, String message,
                                           Class<?> targetActivity) {
        Intent intent = new Intent(context, targetActivity);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK | Intent.FLAG_ACTIVITY_CLEAR_TASK);

        PendingIntent pendingIntent = PendingIntent.getActivity(
            context,
            0,
            intent,
            PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE
        );

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(message)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setContentIntent(pendingIntent)
            .setAutoCancel(true);

        notificationManager.notify(notificationId, builder.build());
    }

    // Big text notification
    public void showBigTextNotification(int notificationId, String title, String message, String bigText) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(message)
            .setStyle(new NotificationCompat.BigTextStyle().bigText(bigText))
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setAutoCancel(true);

        notificationManager.notify(notificationId, builder.build());
    }

    // Notification with buttons
    public void showNotificationWithButtons(int notificationId, String title, String message) {
        // Yes action
        Intent yesIntent = new Intent(context, NotificationReceiver.class);
        yesIntent.setAction("YES_ACTION");
        yesIntent.putExtra("notificationId", notificationId);

        PendingIntent yesPendingIntent = PendingIntent.getBroadcast(
            context,
            0,
            yesIntent,
            PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE
        );

        // No action
        Intent noIntent = new Intent(context, NotificationReceiver.class);
        noIntent.setAction("NO_ACTION");
        noIntent.putExtra("notificationId", notificationId);

        PendingIntent noPendingIntent = PendingIntent.getBroadcast(
            context,
            1,
            noIntent,
            PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE
        );

        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(message)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .addAction(android.R.drawable.ic_menu_add, "Yes", yesPendingIntent)
            .addAction(android.R.drawable.ic_menu_close_clear_cancel, "No", noPendingIntent)
            .setAutoCancel(true);

        notificationManager.notify(notificationId, builder.build());
    }

    // Progress notification
    public void showProgressNotification(int notificationId, String title, int progress) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(progress + "% completed")
            .setProgress(100, progress, false)
            .setPriority(NotificationCompat.PRIORITY_LOW)
            .setOngoing(true);

        notificationManager.notify(notificationId, builder.build());
    }

    // Complete progress notification
    public void completeProgressNotification(int notificationId, String title, String message) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(message)
            .setProgress(0, 0, false)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setOngoing(false)
            .setAutoCancel(true);

        notificationManager.notify(notificationId, builder.build());
    }

    // High priority notification
    public void showHighPriorityNotification(int notificationId, String title, String message) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_alert)
            .setContentTitle(title)
            .setContentText(message)
            .setPriority(NotificationCompat.PRIORITY_HIGH)
            .setCategory(NotificationCompat.CATEGORY_ALARM)
            .setAutoCancel(true);

        notificationManager.notify(notificationId, builder.build());
    }

    // Silent notification
    public void showSilentNotification(int notificationId, String title, String message) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(message)
            .setPriority(NotificationCompat.PRIORITY_MIN)
            .setSilent(true)
            .setAutoCancel(true);

        notificationManager.notify(notificationId, builder.build());
    }

    // Cancel notification
    public void cancelNotification(int notificationId) {
        notificationManager.cancel(notificationId);
    }

    // Cancel all notifications
    public void cancelAllNotifications() {
        notificationManager.cancelAll();
    }
}

// 2. Notification Broadcast Receiver
public class NotificationReceiver extends android.content.BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        String action = intent.getAction();
        int notificationId = intent.getIntExtra("notificationId", 0);

        if ("YES_ACTION".equals(action)) {
            System.out.println("User clicked YES");
            // Handle yes action
        } else if ("NO_ACTION".equals(action)) {
            System.out.println("User clicked NO");
            // Handle no action
        }

        // Cancel notification
        NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        manager.cancel(notificationId);
    }
}

// 3. Notification Groups
public class NotificationGroupHelper {
    private Context context;
    private NotificationHelper notificationHelper;
    private static final String GROUP_KEY = "my_app_group";

    public NotificationGroupHelper(Context context) {
        this.context = context;
        this.notificationHelper = new NotificationHelper(context);
    }

    // Add notification to group
    public void addNotificationToGroup(int notificationId, String title, String message) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, NotificationHelper.CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(message)
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setGroup(GROUP_KEY)
            .setAutoCancel(true);

        NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(notificationId, builder.build());
    }

    // Create summary notification
    public void createGroupSummary(int summaryId, String title, int messageCount) {
        NotificationCompat.Builder builder = new NotificationCompat.Builder(context, NotificationHelper.CHANNEL_ID)
            .setSmallIcon(android.R.drawable.ic_dialog_info)
            .setContentTitle(title)
            .setContentText(messageCount + " new messages")
            .setPriority(NotificationCompat.PRIORITY_DEFAULT)
            .setGroup(GROUP_KEY)
            .setGroupSummary(true)
            .setAutoCancel(true);

        NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        manager.notify(summaryId, builder.build());
    }
}

// 4. Status Bar Helper
public class StatusBarHelper {
    private Context context;

    public StatusBarHelper(Context context) {
        this.context = context;
    }

    // Update status bar text (not directly supported, uses notification)
    public void showStatusBarMessage(String message) {
        NotificationHelper helper = new NotificationHelper(context);
        helper.showSimpleNotification(1, "Status", message);
    }

    // Check if notifications are enabled
    public boolean areNotificationsEnabled() {
        NotificationManager manager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.N) {
            return manager.areNotificationsEnabled();
        }
        return true;
    }

    // Open notification settings
    public void openNotificationSettings() {
        Intent intent = new Intent();
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
            intent.setAction("android.settings.APP_NOTIFICATION_SETTINGS");
            intent.putExtra("android.provider.extra.APP_PACKAGE", context.getPackageName());
        } else {
            intent.setAction("android.settings.APPLICATION_DETAILS_SETTINGS");
            intent.setData(android.net.Uri.parse("package:" + context.getPackageName()));
        }
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }
}

// 5. System Settings Helper
public class SystemSettingsHelper {
    private Context context;

    public SystemSettingsHelper(Context context) {
        this.context = context;
    }

    // Open WiFi settings
    public void openWifiSettings() {
        Intent intent = new Intent(android.provider.Settings.ACTION_WIFI_SETTINGS);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }

    // Open Bluetooth settings
    public void openBluetoothSettings() {
        Intent intent = new Intent(android.provider.Settings.ACTION_BLUETOOTH_SETTINGS);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }

    // Open application settings
    public void openApplicationSettings() {
        Intent intent = new Intent(android.provider.Settings.ACTION_APPLICATION_DETAILS_SETTINGS);
        intent.setData(android.net.Uri.parse("package:" + context.getPackageName()));
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }

    // Open system settings
    public void openSystemSettings() {
        Intent intent = new Intent(android.provider.Settings.ACTION_SETTINGS);
        intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(intent);
    }

    // Check if airplane mode is on
    public boolean isAirplaneModeOn() {
        return android.provider.Settings.System.getInt(
            context.getContentResolver(),
            android.provider.Settings.Global.AIRPLANE_MODE_ON,
            0
        ) != 0;
    }
}

// 6. Vibration Helper
public class VibrationHelper {
    private Context context;

    public VibrationHelper(Context context) {
        this.context = context;
    }

    // Vibrate for given duration
    public void vibrate(long milliseconds) {
        android.os.Vibrator vibrator = (android.os.Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        if (vibrator != null && vibrator.hasVibrator()) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                vibrator.vibrate(android.os.VibrationEffect.createOneShot(milliseconds, android.os.VibrationEffect.DEFAULT_AMPLITUDE));
            } else {
                vibrator.vibrate(milliseconds);
            }
        }
    }

    // Vibrate with pattern
    public void vibratePattern(long[] pattern) {
        android.os.Vibrator vibrator = (android.os.Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        if (vibrator != null && vibrator.hasVibrator()) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                vibrator.vibrate(android.os.VibrationEffect.createWaveform(pattern, -1));
            } else {
                vibrator.vibrate(pattern, -1);
            }
        }
    }

    // Vibrate with repeating pattern
    public void vibratePatternRepeat(long[] pattern, int repeat) {
        android.os.Vibrator vibrator = (android.os.Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        if (vibrator != null && vibrator.hasVibrator()) {
            if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                vibrator.vibrate(android.os.VibrationEffect.createWaveform(pattern, repeat));
            } else {
                vibrator.vibrate(pattern, repeat);
            }
        }
    }

    // Cancel vibration
    public void cancelVibration() {
        android.os.Vibrator vibrator = (android.os.Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        if (vibrator != null) {
            vibrator.cancel();
        }
    }

    // Check if device can vibrate
    public boolean hasVibrator() {
        android.os.Vibrator vibrator = (android.os.Vibrator) context.getSystemService(Context.VIBRATOR_SERVICE);
        return vibrator != null && vibrator.hasVibrator();
    }
}

// 7. Sound Helper
public class SoundHelper {
    private Context context;

    public SoundHelper(Context context) {
        this.context = context;
    }

    // Play notification sound
    public void playNotificationSound() {
        android.media.Ringtone ringtone = android.media.RingtoneManager.getRingtone(
            context,
            android.media.RingtoneManager.getDefaultUri(android.media.RingtoneManager.TYPE_NOTIFICATION)
        );
        ringtone.play();
    }

    // Play ringtone
    public void playRingtone() {
        android.media.Ringtone ringtone = android.media.RingtoneManager.getRingtone(
            context,
            android.media.RingtoneManager.getDefaultUri(android.media.RingtoneManager.TYPE_RINGTONE)
        );
        ringtone.play();
    }

    // Play alarm sound
    public void playAlarmSound() {
        android.media.Ringtone ringtone = android.media.RingtoneManager.getRingtone(
            context,
            android.media.RingtoneManager.getDefaultUri(android.media.RingtoneManager.TYPE_ALARM)
        );
        ringtone.play();
    }
}

// Main demonstration
public class SystemIntegrationDemo {
    public static void demonstrateSystemIntegration(Context context) {
        System.out.println("=== Android Java System Integration Examples ===\n");

        NotificationHelper notificationHelper = new NotificationHelper(context);
        VibrationHelper vibrationHelper = new VibrationHelper(context);
        SoundHelper soundHelper = new SoundHelper(context);
        StatusBarHelper statusBarHelper = new StatusBarHelper(context);
        SystemSettingsHelper settingsHelper = new SystemSettingsHelper(context);

        // 1. Simple notification
        System.out.println("--- 1. Simple Notification ---");
        notificationHelper.showSimpleNotification(1, "My App", "This is a simple notification");

        // 2. Big text notification
        System.out.println("\n--- 2. Big Text Notification ---");
        notificationHelper.showBigTextNotification(
            2,
            "New Message",
            "You have received a new message",
            "This is a longer text that will be expanded in the notification to show more details to the user."
        );

        // 3. Notification with buttons
        System.out.println("\n--- 3. Notification with Buttons ---");
        notificationHelper.showNotificationWithButtons(
            3,
            "Confirm Action",
            "Do you want to proceed?"
        );

        // 4. Progress notification
        System.out.println("\n--- 4. Progress Notification ---");
        for (int i = 0; i <= 100; i += 20) {
            notificationHelper.showProgressNotification(4, "Downloading", i);
            try {
                Thread.sleep(500);
            } catch (InterruptedException e) {
                // Ignore
            }
        }
        notificationHelper.completeProgressNotification(4, "Download Complete", "File downloaded successfully");

        // 5. Vibration
        System.out.println("\n--- 5. Vibration ---");
        System.out.println("Has vibrator: " + vibrationHelper.hasVibrator());
        vibrationHelper.vibrate(500);

        // Vibrate pattern
        long[] pattern = {0, 200, 100, 200, 100, 200};
        vibrationHelper.vibratePattern(pattern);

        // 6. Sound
        System.out.println("\n--- 6. Sound ---");
        soundHelper.playNotificationSound();

        // 7. Status bar
        System.out.println("\n--- 7. Status Bar ---");
        System.out.println("Notifications enabled: " + statusBarHelper.areNotificationsEnabled());
        statusBarHelper.showStatusBarMessage("Status bar message");

        // 8. System settings
        System.out.println("\n--- 8. System Settings ---");
        System.out.println("Airplane mode: " + settingsHelper.isAirplaneModeOn());

        // Uncomment to open settings
        // settingsHelper.openWifiSettings();
        // settingsHelper.openApplicationSettings();

        // 9. Notification groups
        System.out.println("\n--- 9. Notification Groups ---");
        NotificationGroupHelper groupHelper = new NotificationGroupHelper(context);

        groupHelper.addNotificationToGroup(10, "Message 1", "First message");
        groupHelper.addNotificationToGroup(11, "Message 2", "Second message");
        groupHelper.addNotificationToGroup(12, "Message 3", "Third message");
        groupHelper.createGroupSummary(13, "New Messages", 3);

        // 10. Cancel notifications
        System.out.println("\n--- 10. Cancel Notifications ---");
        // notificationHelper.cancelNotification(1);
        // notificationHelper.cancelAllNotifications();

        System.out.println("\n=== All System Integration Examples Completed ===");
    }
}