java - 如何从小部件本身内部手动调用 `onUpdate`

public class VWid extends AppWidgetProvider {

    public static String WIDGET_UPDATE = "WIDGET_UPDATE";

    @Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);

        if (WIDGET_UPDATE.equals(intent.getAction())) {
            Toast.makeText(context, "onReceiver()", Toast.LENGTH_LONG).show();
        }
    }

    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        final int N = appWidgetIds.length;

        // Perform this loop procedure for each App Widget that belongs to this
        // provider
        for (int i = 0; i < N; i++) {
            int appWidgetId = appWidgetIds[i];
            int k, p;
            SimpleDateFormat dateFormat = new SimpleDateFormat("MM-dd-yyyy hh:mm a");

            AudioManager audioManager = (AudioManager) context.getSystemService(Context.AUDIO_SERVICE);
            int k = audioManager.getStreamVolume(AudioManager.STREAM_SYSTEM);
            Toast.makeText(getActivity(), k+"", Toast.LENGTH_LONG).show();

            Intent imageview2Intent= new Intent(context, VWid.class);
            PendingIntent pendingIntent2= PendingIntent.getBroadcast(context,0, imageview2Intent,0);

            views.setOnClickPendingIntent(R.id.imagebuttonrefresh, pendingIntent2); //

            views.setTextViewText(R.id.textview1, "Last Refresh: " + dateFormat.format(new Date()).toString());

            pushWidgetUpdate(context, views);
        }
    }

    public static void pushWidgetUpdate(Context context, RemoteViews remoteViews) {
        ComponentName myWidget = new ComponentName(context, VWid.class);
        AppWidgetManager manager = AppWidgetManager.getInstance(context);
        manager.updateAppWidget(myWidget, remoteViews);
        Log.d("UPDATED", "testing");
    }
}

当我第一次将小部件添加到主屏幕时，textview1显示:Last Refresh: {current date and time}。它还在Toast中显示系统音量。

假设我增加/减少了系统音量，当我点击刷新时，onUpdate()函数应该触发以显示更新的Toast并将textview1文本更新为新的数据和时间，但这没有发生。

我如何修改代码，以便可以实现刷新，实质上是调用onUpdate()函数。

最佳答案

试试这个:

public class WidgetProvider extends AppWidgetProvider {

 public static final String REFRESH_ACTION = "com.packagename.REFRESH_ACTION";

@Override
    public void onReceive(Context context, Intent intent) {
        super.onReceive(context, intent);

   if (intent.getAction().equals(WidgetProvider.REFRESH_ACTION)) {
        Bundle extras = intent.getExtras();
        if (extras != null) {
            int[] appWidgetIds = extras.getIntArray(AppWidgetManager.EXTRA_APPWIDGET_IDS);

            if (appWidgetIds != null && appWidgetIds.length > 0) {
                Toast.makeText(context, "REFRESH", Toast.LENGTH_SHORT).show();
                this.onUpdate(context, AppWidgetManager.getInstance(context), appWidgetIds);
            }
        }
    }

}


@Override
public void onUpdate(final Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
    final int N = appWidgetIds.length;


    for (int i = 0; i < N; ++i) {

        RemoteViews rv = new RemoteViews(context.getPackageName(), R.layout.widget_layout);

        Intent intentServiceCall = new Intent(context, WidgetService.class);
        intentServiceCall.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetIds[i]);

     //Refresh
        Intent refreshIntent = new Intent(context, WidgetProvider.class);
        refreshIntent.setAction(WidgetProvider.REFRESH_ACTION);
        refreshIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_IDS, appWidgetIds);
        intentServiceCall.setData(Uri.parse(intentServiceCall.toUri(Intent.URI_INTENT_SCHEME)));
        PendingIntent pendingIntent = PendingIntent.getBroadcast(context, 0, refreshIntent, PendingIntent.FLAG_UPDATE_CURRENT);
        rv.setOnClickPendingIntent(R.id.ivRefreshWidget, pendingIntent);

  appWidgetManager.updateAppWidget(appWidgetIds[i], rv);
    }
    super.onUpdate(context, appWidgetManager, appWidgetIds);
}