在OnMessageCeeive -FCM中显示一个警报对话框

Question

我试图在MyFirebaseMessagingService类的onMessageReceived中显示一条警报消息，我会发现一个错误：

    java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
                                                                                    at android.os.Handler.<init>(Handler.java:200)
                                                                                    at android.os.Handler.<init>(Handler.java:114)
                                                                                    at android.app.Activity.<init>(Activity.java:846)
                                                                                    at android.support.v4.app.SupportActivity.<init>(SupportActivity.java:38)
                                                                                    at android.support.v4.app.BaseFragmentActivityApi14.<init>(BaseFragmentActivityApi14.java:28)
                                                                                    at android.support.v4.app.BaseFragmentActivityApi16.<init>(BaseFragmentActivityApi16.java:34)
                                                                                    at android.support.v4.app.FragmentActivity.<init>(FragmentActivity.java:67)
                                                                                    at android.support.v7.app.AppCompatActivity.<init>(AppCompatActivity.java:61)
                                                                                    at com.dopay.onboarding.activity.BaseActivity.<init>(BaseActivity.java:51)
                                                                                    at com.dopay.onboarding.FMS.MyFirebaseMessagingService.onMessageReceived(MyFirebaseMessagingService.java:75)
                                                                                    at com.google.firebase.messaging.FirebaseMessagingService.handleIntent(Unknown Source)
                                                                                    at com.google.firebase.iid.zzc.run(Unknown Source)
                                                                                    at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1133)
                                                                                    at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:607)
                                                                                    at java.lang.Thread.run(Thread.java:762)
02

我尝试过的。

@Override
    public void onMessageReceived(RemoteMessage remoteMessage) {
        if (remoteMessage.getData().size() > 0) {
 BaseActivity baseActivity = new BaseActivity();
                baseActivity.showDialog();
}
}

baseactivity

  public void showDialog(){
        this.runOnUiThread(new Runnable() {
            public void run() {
                    //Toast.makeText(this, "Hello", Toast.LENGTH_SHORT).show();
                DialogUtil.showAlert(getApplicationContext(), R.string.message_complete_required_fields);
            }
        });
    }

dialogutil

  public static void showAlert(Context context, int messageId) {
        AlertDialog.Builder builder = new AlertDialog.Builder(context);
        builder.setMessage(messageId)
                .setCancelable(true)
                .setPositiveButton(context.getResources().getString(R.string.label_ok), null);
        builder.create().show();
    }

关于如何在OnMessageRecevered中打开警报对话框的任何建议。

谢谢r

Answer 1

这是我问题的两美分：

1. 使用Activity上下文显示对话框或与UI相关的任何内容。同样，您开始活动的方式，这不是开放的方式。您可以选择在顶部栏上显示通知并在其上设置PendingIntent，以便单击它可以打开所需的活动。单击FCM

的通知时打开特定活动

2. ，而不是从onMessageReceived获取对BaseActivity的引用，而是将其解耦。使用LocalBroadcastManager或Handler将消息发送到活动以显示对话框。这样，如果活动开放，它将对此作用，否则不会做任何事情。检查GCM IntentService如何在通知接收中显示弹出

Answer 2

问题是该行：baseeactivity baseactivity = new BaseActivity((;您不应创建活动实例，应该通过系统来创建它。当您通过" new"命令创建实例时，它被视为正常类，所有上下文都是错误的。

这个想法是启动活动并让活动处理对话框。快速修复是这样的：

@Override public void onMessageReceived(remotemessage remotemessage({

    if (remoteMessage.getData().size() > 0) {
         Intent intent = new Intent(this, BaseActivity.class);
         startActivity(intent);
    }

}

在baseactivity.class上，increate((方法中的showdialog((。