ultrasonic-app-subsonic-android/src/com/thejoshwa/ultrasonic/androidapp/provider/UltraSonicAppWidgetProvider.java

package com.thejoshwa.ultrasonic.androidapp.provider;

import com.thejoshwa.ultrasonic.androidapp.R;
import com.thejoshwa.ultrasonic.androidapp.activity.DownloadActivity;
import com.thejoshwa.ultrasonic.androidapp.activity.MainActivity;
import com.thejoshwa.ultrasonic.androidapp.domain.MusicDirectory;
import com.thejoshwa.ultrasonic.androidapp.service.DownloadService;
import com.thejoshwa.ultrasonic.androidapp.service.DownloadServiceImpl;
import com.thejoshwa.ultrasonic.androidapp.util.FileUtil;

import android.app.PendingIntent;
import android.appwidget.AppWidgetManager;
import android.appwidget.AppWidgetProvider;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.res.Resources;
import android.graphics.Bitmap;
import android.graphics.drawable.Drawable;
import android.os.Environment;
import android.util.Log;
import android.view.KeyEvent;
import android.widget.RemoteViews;

public class UltraSonicAppWidgetProvider extends AppWidgetProvider {
    
    private final static String TAG = UltraSonicAppWidgetProvider.class.getSimpleName();
	protected int layoutId;
	
	@Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        defaultAppWidget(context, appWidgetIds);
    }
	
    /**
     * Initialize given widgets to default state, where we launch UltraSonic on default click
     * and hide actions if service not running.
     */
    private void defaultAppWidget(Context context, int[] appWidgetIds) {
        final Resources res = context.getResources();
        final RemoteViews views = new RemoteViews(context.getPackageName(), this.layoutId);

        views.setTextViewText(R.id.artist, res.getText(R.string.widget_initial_text));
        
        linkButtons(context, views, false);
        pushUpdate(context, appWidgetIds, views);
    }
    
    private void pushUpdate(Context context, int[] appWidgetIds, RemoteViews views) {
        // Update specific list of appWidgetIds if given, otherwise default to all
        final AppWidgetManager manager = AppWidgetManager.getInstance(context);

        if (manager != null) {
            if (appWidgetIds != null) {
                manager.updateAppWidget(appWidgetIds, views);
            } else {
                manager.updateAppWidget(new ComponentName(context, this.getClass()), views);
            }
        }
    }
    
    /**
     * Handle a change notification coming over from {@link DownloadService}
     */
    public void notifyChange(Context context, DownloadService service, boolean playing, boolean setAlbum) {
        if (hasInstances(context)) {
            performUpdate(context, service, null, playing, setAlbum);
        }
    }
    
    /**
     * Check against {@link AppWidgetManager} if there are any instances of this widget.
     */
    private boolean hasInstances(Context context) {
        AppWidgetManager manager = AppWidgetManager.getInstance(context);
        int[] appWidgetIds = new int[0];

        if (manager != null) {
            appWidgetIds = manager.getAppWidgetIds(new ComponentName(context, getClass()));
        }

        return (appWidgetIds.length > 0);
    }
    
    /**
     * Update all active widget instances by pushing changes
     */
    private void performUpdate(Context context, DownloadService service, int[] appWidgetIds, boolean playing, boolean setAlbum) {
        final Resources res = context.getResources();
        final RemoteViews views = new RemoteViews(context.getPackageName(), this.layoutId);

        MusicDirectory.Entry currentPlaying = service.getCurrentPlaying() == null ? null : service.getCurrentPlaying().getSong();
        String title = currentPlaying == null ? null : currentPlaying.getTitle();
        String artist = currentPlaying == null ? null : currentPlaying.getArtist();
        String album = currentPlaying == null ? null : currentPlaying.getAlbum();
        CharSequence errorState = null;

        // Show error message?
        String status = Environment.getExternalStorageState();
        if (status.equals(Environment.MEDIA_SHARED) ||
            status.equals(Environment.MEDIA_UNMOUNTED)) {
            errorState = res.getText(R.string.widget_sdcard_busy);
        } else if (status.equals(Environment.MEDIA_REMOVED)) {
            errorState = res.getText(R.string.widget_sdcard_missing);
        } else if (currentPlaying == null) {
            errorState = res.getText(R.string.widget_initial_text);
        }

        if (errorState != null) {
            // Show error state to user
        	views.setTextViewText(R.id.title, null);
            views.setTextViewText(R.id.artist, errorState);
            if (setAlbum) {
            	views.setTextViewText(R.id.album, null);
            }
            views.setImageViewResource(R.id.appwidget_coverart, R.drawable.appwidget_art_default);
        } else {
            // No error, so show normal titles
            views.setTextViewText(R.id.title, title);
            views.setTextViewText(R.id.artist, artist);
            if (setAlbum) {
            	views.setTextViewText(R.id.album, album);
            }
        }

        // Set correct drawable for pause state
        if (playing) {
            views.setImageViewResource(R.id.control_play, R.drawable.media_pause_normal_dark);
        } else {
            views.setImageViewResource(R.id.control_play, R.drawable.media_start_normal_dark);
        }

        // Set the cover art
        try {
            int size;
            Resources resources = context.getResources();
            Drawable drawable = resources.getDrawable(R.drawable.appwidget_art_default);
            size = drawable != null ? drawable.getIntrinsicHeight() : 0;

            Bitmap bitmap = currentPlaying == null ? null : FileUtil.getAlbumArtBitmap(context, currentPlaying, size, true);

            if (bitmap == null) {
                // Set default cover art
                views.setImageViewResource(R.id.appwidget_coverart, R.drawable.appwidget_art_default);
            } else {
                //bitmap = getRoundedCornerBitmap(bitmap);
                views.setImageViewBitmap(R.id.appwidget_coverart, bitmap);
            }
        } catch (Exception x) {
            Log.e(TAG, "Failed to load cover art", x);
            views.setImageViewResource(R.id.appwidget_coverart, R.drawable.appwidget_art_default);
        }

        // Link actions buttons to intents
        linkButtons(context, views, currentPlaying != null);

        pushUpdate(context, appWidgetIds, views);
    }
    
    /**
     * Link up various button actions using {@link PendingIntent}.
     *
     * @param playerActive True if player is active in background, which means
     *                     widget click will launch {@link DownloadActivity},
     *                     otherwise we launch {@link MainActivity}.
     */
    private void linkButtons(Context context, RemoteViews views, boolean playerActive) {

        Intent intent = new Intent(context, playerActive ? DownloadActivity.class : MainActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);
        views.setOnClickPendingIntent(R.id.appwidget_coverart, pendingIntent);
        views.setOnClickPendingIntent(R.id.appwidget_top, pendingIntent);
        
        // Emulate media button clicks.
        intent = new Intent("1");
        intent.setComponent(new ComponentName(context, DownloadServiceImpl.class));
        intent.putExtra(Intent.EXTRA_KEY_EVENT, new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE));
        pendingIntent = PendingIntent.getService(context, 0, intent, 0);
        views.setOnClickPendingIntent(R.id.control_play, pendingIntent);

        intent = new Intent("2");  // Use a unique action name to ensure a different PendingIntent to be created.
        intent.setComponent(new ComponentName(context, DownloadServiceImpl.class));
        intent.putExtra(Intent.EXTRA_KEY_EVENT, new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_NEXT));
        pendingIntent = PendingIntent.getService(context, 0, intent, 0);
        views.setOnClickPendingIntent(R.id.control_next, pendingIntent);
        
        intent = new Intent("3");  // Use a unique action name to ensure a different PendingIntent to be created.
        intent.setComponent(new ComponentName(context, DownloadServiceImpl.class));
        intent.putExtra(Intent.EXTRA_KEY_EVENT, new KeyEvent(KeyEvent.ACTION_DOWN, KeyEvent.KEYCODE_MEDIA_PREVIOUS));
        pendingIntent = PendingIntent.getService(context, 0, intent, 0);
        views.setOnClickPendingIntent(R.id.control_previous, pendingIntent);
    }
}