将Firebase通知的MessageBody显示为Toast

Question

我在显示Toast消息时遇到运行时异常

java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

当用户从应用中的收到推送通知时，我想将消息正文显示为Toast消息。

任何帮助？

public class MyAppFirebaseMessagingService extends FirebaseMessagingService {

    private static final String TAG = "FCM Service";

    @Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
              if (remoteMessage.getNotification() != null) {
            if (AppConfig.SYSTEM_WIDE_DEBUG) {
                Log.d(TAG, "Message Notification Body: " + remoteMessage.getNotification().getBody());
            }

            sendNotification(remoteMessage.getNotification().getBody());
        }

    }

    private void sendNotification(String messageBody) {
        Toast.makeText(getApplicationContext(),messageBody,Toast.LENGTH_LONG).show();

        Intent intent = new Intent(this, HomeActivity.class);
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(this, 0 /* Request code */, intent, PendingIntent.FLAG_ONE_SHOT);

        Uri defaultSoundUri = Uri.parse("android.resource://" + getPackageName() + "/" + R.raw.pushnotify);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon( R.mipmap.ic_launcher)
                .setContentTitle("My APP")
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);

        notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
    }
}

Answer 1

如果你想要显示Toast。你必须在UI线程上运行;

示例：

Handler handler = new Handler(Looper.getMainLooper());
handler.post(new Runnable() {
    public void run() {
        Toast.makeText(getApplicationContext(),Toast.LENGTH_SHORT).show();
    }
});