来自广播接收器的 android 更新小部件-移动开发问题

android update widget from broadcast receiver(来自广播接收器的 android 更新小部件)

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问题描述

I have an widget and I must update the widget when action android.media.RINGER_MODE_CHANGED occurs. I have the folowing broadcast receiver:

public void onReceive(Context context, Intent intent) {
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context.getApplicationContext());
        ComponentName thisWidget = new ComponentName(context.getApplicationContext(), ExampleAppWidgetProvider.class);
        int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
        if (appWidgetIds != null && appWidgetIds.length > 0) {
            for (int widgetId : appWidgetIds) {
                RemoteViews remoteViews = new RemoteViews(context
                        .getApplicationContext().getPackageName(),
                        R.layout.widget1);
                appWidgetManager.updateAppWidget(widgetId, remoteViews);
            }
        }
    }

and this si code for my widget

public class ExampleAppWidgetProvider extends AppWidgetProvider {
    DateFormat df = new SimpleDateFormat("hh:mm:ss");

    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        final int N = appWidgetIds.length;
        for (int i = 0; i < N; i++) {
            int appWidgetId = appWidgetIds[i];
            //my pudate widget code
            appWidgetManager.updateAppWidget(appWidgetId, views);
        }
    }
}

<receiver android:name=".ExampleAppWidgetProvider" android:label="demo widget">
  <intent-filter>
        <action android:name="android.appwidget.action.APPWIDGET_UPDATE" />
  </intent-filter>
  <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget1_info" />
</receiver>

so my problem is that even if the instruction appWidgetManager.updateAppWidget(widgetId, remoteViews); from my broadcast receiver is executed, the update method inside the widget is not executed. Does anybody knows why?

解决方案

it seems that AppWidgetProvider extends BroadcastReceiver so here is my code :

public class ExampleAppWidgetProvider extends AppWidgetProvider {
    DateFormat df = new SimpleDateFormat("hh:mm:ss");

    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds) {
        //my update code here
    }

    @Override
    public void onReceive(Context context, Intent intent) {
        AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(context.getApplicationContext());
        ComponentName thisWidget = new ComponentName(context.getApplicationContext(), ExampleAppWidgetProvider.class);
        int[] appWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
        if (appWidgetIds != null && appWidgetIds.length > 0) {
            onUpdate(context, appWidgetManager, appWidgetIds);
        }
    }
}

<receiver android:name=".ExampleAppWidgetProvider" android:label="demo widget">
    <intent-filter>
        <action android:name="android.appwidget.action.APPWIDGET_UPDATE"/>
    </intent-filter>
    <intent-filter>
        <action android:name="android.media.RINGER_MODE_CHANGED"/>
    </intent-filter>
    <meta-data android:name="android.appwidget.provider" android:resource="@xml/widget1_info"/>
</receiver>

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