appWidget点击发起程序问题

最新推荐文章于 2024-07-05 11:38:52 发布

原创最新推荐文章于 2024-07-05 11:38:52 发布 · 218 阅读

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本文详细解析了Android中AppWidget的更新机制，并针对一个具体的AppWidgetProvider实现进行了解读，指出了常见错误及其修正方法。

以前使用一直没问题今天使用竟然来了问题

public class VolumeChangerWidget extends AppWidgetProvider {

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];

                Log.d("Steve", "Running for appWidgetId " + appWidgetId);
                Toast.makeText(context, "Hello from onUpdate", Toast.LENGTH_SHORT);
                Log.d("Steve", "After the toast line");

                Intent intent = new Intent(context, WidgetTest.class);

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

                RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.widget);
                views.setOnClickPendingIntent(R.id.button, pendingIntent);

                appWidgetManager.updateAppWidget(appWidgetId, views);
        }
}

错误的地方在于不能引用自带的参数

 AppWidgetManager mgr = AppWidgetManager.getInstance(context); 
    mgr.updateAppWidget(comp, views);

这是主要原因了。当然你也可以在不同的地方使用

onEnabled and onUpdated

@Override 
    public void onEnabled(Context context) {  
         
          AppWidgetManager mgr = AppWidgetManager.getInstance(context); 
          //retrieve a ref to the manager so we can pass a view update 

          Intent i = new Intent(); 
          i.setClassName("yourdoman.yourpackage", "yourdomain.yourpackage.yourclass"); 
          PendingIntent myPI = PendingIntent.getService(context, 0, i, 0); 
          //intent to start service 

        // Get the layout for the App Widget 
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.togglelayout); 

        //attach the click listener for the service start command intent 
        views.setOnClickPendingIntent(R.id.toggleButton, myPI); 

        //define the componenet for self 
        ComponentName comp = new ComponentName(context.getPackageName(), ToggleWidget.class.getName()); 

        //tell the manager to update all instances of the toggle widget with the click listener 
        mgr.updateAppWidget(comp, views); 
}