Java 应用程序choose上具有BroadcastReceiver调用活动的意向选择器

我正在使用意图选择器，我需要知道选择了哪一个可用的应用程序。为此，我在活动中创建了如下意图选择器：

List<Intent> targetedShareIntents = new ArrayList<>();
targetedShareIntents.add(intent1);
targetedShareIntents.add(intent2);
Intent receiver = new Intent(this, BReceiver.class);
PendingIntent pendingIntent = PendingIntent.getBroadcast(this, 0, receiver, PendingIntent.FLAG_UPDATE_CURRENT);
Intent chooserIntent = Intent.createChooser(targetedShareIntents.remove(0), "Choose an app", pendingIntent.getIntentSender());
chooserIntent.putExtra(Intent.EXTRA_INITIAL_INTENTS, targetedShareIntents.toArray(new Parcelable[]{}));
startActivity(chooserIntent);

这非常有效，但我需要广播接收器调用传递appName的主活动的方法。为此，我需要向接收方传递活动的引用，但是，由于我没有使用构造函数创建接收方，我不知道如何实现它。我需要这样的东西作为广播接收器的代码：

public class BReceiver extends BroadcastReceiver {
    MainActivity activity;
    @Override
    public void onReceive(Context context, Intent intent) {
        for (String key : Objects.requireNonNull(intent.getExtras()).keySet()) {
            try {
                ComponentName componentInfo = (ComponentName) intent.getExtras().get(key);
                PackageManager packageManager = context.getPackageManager();
                String appName = (String) packageManager.getApplicationLabel(packageManager.getApplicationInfo(componentInfo.getPackageName(), PackageManager.GET_META_DATA));
                activity.appChosen(appName);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

public class BReceiver extends BroadcastReceiver {
    @Override
    public void onReceive(Context context, Intent intent) {
        for (String key : Objects.requireNonNull(intent.getExtras()).keySet()) {
            try {
                ComponentName componentInfo = (ComponentName) intent.getExtras().get(key);
                PackageManager packageManager = context.getPackageManager();
                String appName = (String) packageManager.getApplicationLabel(packageManager.getApplicationInfo(componentInfo.getPackageName(), PackageManager.GET_META_DATA));
                if(appName.equals("appX")){
                    // Do something
                }
                else if(appName.equals("appY")){
                    // Do something
                }
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}

public class BReceiver extends BroadcastReceiver {
    MainActivity activity;
    @Override
    public void onReceive(Context context, Intent intent) {
        for (String key : Objects.requireNonNull(intent.getExtras()).keySet()) {
            try {
                ComponentName componentInfo = (ComponentName) intent.getExtras().get(key);
                PackageManager packageManager = context.getPackageManager();
                String appName = (String) packageManager.getApplicationLabel(packageManager.getApplicationInfo(componentInfo.getPackageName(), PackageManager.GET_META_DATA));
                activity.appChosen(appName);
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }
}