Question

我正在构建一个具有多个按钮的小部件，每个按钮都将自己的意图发送给广播接收器。广播接收器假设基于按下哪个按钮显示Toast消息。代码目前看起来像这样：

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);
        }
    }
}

和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();    
    }
}

我的问题是，无论按下哪个按钮，它始终会显示Widget pressed: 4。如果我将四行intent4，intent4.putExtra()，pendingIntent4和remoteViews.setOnClickPendingIntent()置于所有其他意图之上，则会始终说Widget pressed: 3。换句话说，无论最后的意图注册是什么，都是Toast消息中显示的小部件。

任何人都知道为什么这不符合我的要求？

Answer 1

您需要为每个pendingintent ex提供单独的请求代码：

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

Answer 2

你的PendingIntents被下一个被覆盖。这是因为它们比较了被封装的Intent，并且在比较Intents时不考虑额外的内容。为每个意图执行此操作：

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);

Answer 3

似乎PendingIntent.getBroadcast（）会忽略requestCode（与PendingIntent.getActivity不同）。

因此，要创建唯一的PendingIntents，您可以为Intent提供数据。

示例：

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

然后按照惯例制作你的Pending Intent，包括requestCode。

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

在Intent中有一个Data元素，AndroidManifest.xml中匹配的Intent Filter也必须有一个Data元素：

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

上述意图过滤器仅用于识别方案（即＆＃34; http＆＃34;）。因此，任何具有该方案的Uri都将匹配此过滤器＆＃34;数据＆＃34;将调用元素和相应的Receiver类。

注意：

NotificationReceiver是我的类，扩展了BroadcastReceiver
NotificationReceiver.INTENT是我在NotificationReceiver中声明的String常量。在这个例子中，它将等于＆＃34; my.package.my_action_string＆＃34 ;;
request_code可以是任何东西。让它独一无二如果你想在将来引用同样的Pending Intent（比如取消使用它的警报），请保存它。

有关使用意图过滤器进行数据测试的更多信息：

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

小部件发送多种类型的意图

3 个答案: