Widget sending multiple types of intents

问题:

I am building a widget that has multiple buttons, each one sending off its own intent to a broadcast receiver. The broadcast receiver is suppose to display a Toast message based on which button was pushed. The code currently looks like this:

public class WidgetProvider extends AppWidgetProvider {

    @Override
    public void onUpdate(Context context, AppWidgetManager appWidgetManager, int[] appWidgetIds){

        ComponentName thisWidget = new ComponentName(context, WidgetProvider.class);
        int[] allWidgetIds = appWidgetManager.getAppWidgetIds(thisWidget);
        for (int widgetId : allWidgetIds) {
            RemoteViews remoteViews = new RemoteViews(context.getPackageName(), R.layout.widget_layout);

            SharedPreferences prefs = PreferenceManager.getDefaultSharedPreferences(context);

            // Set the text of the buttons
            remoteViews.setTextViewText(R.id.widgetPreset1Button, prefs.getString("widget1", "Not set"));
            remoteViews.setTextViewText(R.id.widgetPreset2Button, prefs.getString("widget2", "Not set"));
            remoteViews.setTextViewText(R.id.widgetPreset3Button, prefs.getString("widget3", "Not set"));
            remoteViews.setTextViewText(R.id.widgetPreset4Button, prefs.getString("widget4", "Not set"));

            // Register the buttons with an OnClick event
            Intent intent1 = new Intent("myapp.SendWidgetPreset");
            intent1.putExtra("Widget", 1);
            PendingIntent pendingIntent1 = PendingIntent.getBroadcast(context, 0, intent1, PendingIntent.FLAG_UPDATE_CURRENT);
            remoteViews.setOnClickPendingIntent(R.id.widgetPreset1Button, pendingIntent1);

            Intent intent2 = new Intent("myapp.SendWidgetPreset");
            intent2.putExtra("Widget", 2);
            PendingIntent pendingIntent2 = PendingIntent.getBroadcast(context, 0, intent2, PendingIntent.FLAG_UPDATE_CURRENT);
            remoteViews.setOnClickPendingIntent(R.id.widgetPreset2Button, pendingIntent2);

            Intent intent3 = new Intent("myapp.SendWidgetPreset");
            intent3.putExtra("Widget", 3);
            PendingIntent pendingIntent3 = PendingIntent.getBroadcast(context, 0, intent3, PendingIntent.FLAG_UPDATE_CURRENT);
            remoteViews.setOnClickPendingIntent(R.id.widgetPreset3Button, pendingIntent3);

            Intent intent4 = new Intent("myapp.SendWidgetPreset");
            intent4.putExtra("Widget", 4);
            PendingIntent pendingIntent4 = PendingIntent.getBroadcast(context, 0, intent4, PendingIntent.FLAG_UPDATE_CURRENT);
            remoteViews.setOnClickPendingIntent(R.id.widgetPreset4Button, pendingIntent4);

            new WidgetBroadcastReceiver();

            appWidgetManager.updateAppWidget(widgetId, remoteViews);
        }
    }
}

and the BroadcastReceiver:

public class WidgetBroadcastReceiver extends BroadcastReceiver{

    public WidgetBroadcastReceiver(){
    }

    @Override
    public void onReceive(Context context, Intent arg1) {
        int widget = arg1.getIntExtra("Widget", -1);

        Toast.makeText(context, "Widget pressed: " + widget, Toast.LENGTH_SHORT).show();    
    }
}

My problem is it always displays Widget pressed: 4 regardless of which button is pressed. If I put the four lines intent4, intent4.putExtra(), pendingIntent4, and remoteViews.setOnClickPendingIntent() above all of the other intents, it will then always say Widget pressed: 3. In other words, whatever the last intent registration is, that is the widget displayed in the Toast message.

Anyone know why this isn't working how I want it?

回答1:

you need to provide seperate request code for each pendingintent ex:

PendingIntent pendingIntent1 = PendingIntent.getBroadcast(context, 0, intent1, PendingIntent.FLAG_UPDATE_CURRENT); 
PendingIntent pendingIntent1 = PendingIntent.getBroadcast(context, 1/*request code*/, intent1, PendingIntent.FLAG_UPDATE_CURRENT);

回答2:

Your PendingIntents are being overwritten by the next one. THis is because they compare the Intent being encapsulated, and extras are not considered when comparing Intents. Do this for each intent:

Intent intent1 = new Intent("myapp.SendWidgetPreset");
intent1.putExtra("Widget", 1);

// This line makes your intents different
intent1.setData(Uri.parse(intent1.toUri(Intent.URI_INTENT_SCHEME)));

PendingIntent pendingIntent1 = PendingIntent.getBroadcast(context, 0, intent1, PendingIntent.FLAG_UPDATE_CURRENT);
remoteViews.setOnClickPendingIntent(R.id.widgetPreset1Button, pendingIntent1);

回答3:

Seems like PendingIntent.getBroadcast() will ignore requestCode (unlike PendingIntent.getActivity).

Thus, to make unique PendingIntents you could supply Data for the Intent.

Example:

public static Intent makeUniqueIntent(String action, int requestCode) {
        Intent intent = new Intent(action);
        intent.setData(Uri.parse("http://"+ String.valueOf(requestCode)));
        return intent;
    }

Then make your Pending Intent as per usual, including the requestCode.

PendingIntent.getBroadcast(ctx, request_code,
                makeUniqueIntent(NotificationReceiver.INTENT, request_code),
                PendingIntent.FLAG_CANCEL_CURRENT);

With a Data element in an Intent, a matching Intent Filter within AndroidManifest.xml must also have a Data element:

<receiver android:name=".service.NotificationReceiver">
       <intent-filter>
           <action android:name="my.package.my_action_string"/>
           <data android:scheme="http"/>
       </intent-filter>
</receiver>

The above intent-filter works as only a scheme (i.e. "http") was identified. So any Uri with that scheme will match this filter's "data" element and the corresponding Receiver class will be called.

Notes:

• NotificationReceiver is my class, extending BroadcastReceiver
• NotificationReceiver.INTENT is a String constant I declared in NotificationReceiver. In this example it would equal "my.package.my_action_string";
• request_code can be anything. Make it unique & save it if you want to reference this same Pending Intent in the future (say for canceling an alarm that uses it).

More info on Data test with Intent Filters:

http://developer.android.com/guide/components/intents-filters.html#DataTest