Android 小部件 onUpdate()

Question

所以，我开发了一个 android 小部件，它应该用作按钮。我使用了这里给出的基本代码:http://developer.android.com/guide/topics/appwidgets/index.html单击该按钮时，将启动一个 Activity 。这每次都很好用!但是，当我记录单击按钮的时间时，我只得到了第一次。为什么会这样？

这是我被要求的代码:

public class ExampleAppWidgetProvider extends AppWidgetProvider {

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];
        Log.d("myButton","This is only called once.Why????????")
        // Create an Intent to launch ExampleActivity
        Intent intent = new Intent(context, ExampleActivity.class);
        PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

        // Get the layout for the App Widget and attach an on-click listener
        // to the button
        RemoteViews views = new RemoteViews(context.getPackageName(), R.layout.appwidget_provider_layout);
        views.setOnClickPendingIntent(R.id.button, pendingIntent);

        // Tell the AppWidgetManager to perform an update on the current app widget
        appWidgetManager.updateAppWidget(appWidgetId, views);
    }
}

Answer 1

该日志语句位于小部件的 onUpdate 方法中，并且仅在创建小部件时以及在小部件的更新周期内被调用。要让它在点击时登录，您可以执行以下两项操作之一。

一个。将log语句放在ExampleActivity的onCreate方法中

B.更改挂起的 Intent 以使用标志更新 AppWidgetProvider，然后覆盖 onReceive 方法以执行日志声明，然后启动 ExampleActivity(如果存在标志)。例如:

Intent intent = new Intent(context, ExampleAppWidgetProvider.class);
intent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, appWidgetId);
intent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
intent.putExtra(SOME_FINAL_STRING, true);
PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, 0);

然后在onReceive方法中:

@Override
public void onReceive(Context context, Intent intent) {
    String action = intent.getAction();
    Bundle extras = intent.getExtras();

    if(AppWidgetManager.ACTION_APPWIDGET_UPDATE.equals(action) && extras != null && extras.getBoolean(SOME_FINAL_STRING) == true){
        Log.d("myButton","Should no longer be called once!");
        Intent newIntent = new Intent(context, ExampleActivity.class);
        newIntent.addFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
        context.startActivity(newIntent);
    } else {
        super.onReceive(context, intent);
    }
}