android - 为什么 AppWidgetManager 会为 Widgets 更新所有 RemoteViews 的 Intent？

Question

我在我的 Android 应用程序中定义了一个小部件，该小部件映射到由配置 Activity 选择的特定电灯开关。小部件的每个实例都可以映射到不同的灯开关，点击小部件可以打开和关闭灯。以下是设置小部件的 Activity 中的代码:

@Override
public boolean onOptionsItemSelected(MenuItem item) {
    if (item.getItemId() != R.id.action_choose) {
        return super.onOptionsItemSelected(item);
    RemoteViews remoteViews = new RemoteViews(this.getPackageName(), R.layout.device_widget);
    remoteViews.setImageViewResource(R.id.widgetOnOffButton, android.R.drawable.star_big_off);

    SharedPreferences.Editor prefs = getApplicationContext().getSharedPreferences(MyWidgetService.WIDGET_PREFS, MODE_PRIVATE).edit();
    prefs.putInt(MyWidgetService.WIDGET_DEVICE_ID + Integer.toString(mAppWidgetId), mDeviceId);
    prefs.apply();

    Intent clickIntent = new Intent(this.getApplicationContext(), MyWidgetProvider.class);
    clickIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
    clickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
    clickIntent.putExtra(MyWidgetService.ON_LEVEL, 100);

    PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, clickIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    remoteViews.setOnClickPendingIntent(R.id.widgetOnOffButton, pendingIntent);

    mAppWidgetManager.updateAppWidget(mAppWidgetId, remoteViews);
}

我已验证 mAppWidgetId 是小部件的新 ID。这是我的 AppWidgetProvider 的代码，我使用 onReceive 方法以便我可以访问 Intent 中的额外内容，但是我为任何超出正常点击条件的 Intent 定义了一个 onUpdate 和 onDelete:

@Override
public void onReceive(Context context, Intent intent) {

    String action = intent.getAction();
    int widgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
    int onLevel = intent.getIntExtra(MyWidgetService.ON_LEVEL, -1);

    if(action == AppWidgetManager.ACTION_APPWIDGET_UPDATE && widgetId > -1 && onLevel > -1) {

        Intent newIntent = new Intent(context.getApplicationContext(), WishFullWidgetService.class);
        newIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);
        newIntent.putExtra(MyWidgetService.ON_LEVEL, onLevel);
        context.startService(newIntent);
    }
    super.onReceive(context, intent);

    Intent resultValue = new Intent();
    resultValue.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, mAppWidgetId);
    setResult(RESULT_OK, resultValue);
    finish();

    return true;
}

这是来自 MyWidgetService 的代码。每次单击一个小部件时，我都会使用它自己的 WidgetId 和 OnLevel 重置其 OnClickPendingIntent，但是所有小部件都会使用最新的小部件 ID 和 OnLevel 触发 PendingIntent。

@Override
public int onStartCommand(Intent intent, int flags, int startId) {

    AppWidgetManager appWidgetManager = AppWidgetManager.getInstance(this.getApplicationContext());
    int widgetId = intent.getIntExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, -1);
    int onLevel = intent.getIntExtra(ON_LEVEL, -1);

    RemoteViews remoteViews = new RemoteViews(this.getApplicationContext().getPackageName(), R.layout.device_widget);
    Intent clickIntent = new Intent(this.getApplicationContext(), WishFullWidgetProvider.class);
    clickIntent.setAction(AppWidgetManager.ACTION_APPWIDGET_UPDATE);
    clickIntent.putExtra(AppWidgetManager.EXTRA_APPWIDGET_ID, widgetId);

    if(onLevel > 0) {
        remoteViews.setImageViewResource(R.id.widgetOnOffButton, android.R.drawable.star_big_on);
        clickIntent.putExtra(ON_LEVEL, 0);
    } else {
        remoteViews.setImageViewResource(R.id.widgetOnOffButton, android.R.drawable.star_big_off);
        clickIntent.putExtra(ON_LEVEL, 100);
    }

    if(onLevel > -1) {
        int deviceId = mPrefs.getInt(WIDGET_DEVICE_ID + Integer.toString(widgetId), -1);
        sendMessageToDevice(onLevel, deviceId);
    }

    PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), 0, clickIntent, PendingIntent.FLAG_UPDATE_CURRENT);
    remoteViews.setOnClickPendingIntent(R.id.widgetOnOffButton, pendingIntent);
    appWidgetManager.updateAppWidget(widgetId, remoteViews);

    stopSelf();
    return super.onStartCommand(intent, flags, startId);
}

此时，如果我有 Widget 1 和 Widget 2，单击 Widget 1 将触发包含 Widget 2 的 ID 和 OnLevel 的 Intent。如何独立更新每个 widget 的 OnClickPendingIntent，而不用最新的覆盖其他的？

Answer 1

传递一个唯一的整数作为 pendingIntent 的第一个标志(第二个参数)，最好是 widgetID。

PendingIntent pendingIntent = PendingIntent.getBroadcast(getApplicationContext(), uniqueID, clickIntent, PendingIntent.FLAG_UPDATE_CURRENT);

这将导致 android 不会覆盖现有的 pendingIntent，而是创建一个新的。

这是一个 link到有类似问题的不同帖子。