android - 在 onMessageReceived 中显示警报对话框 - FCM

Question

我试图在 MyFirebaseMessagingService 类的 onMessageReceived 中显示警告消息，但我收到错误消息:

    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();
}

}

基础 Activity

  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();
    }

有关如何在 onMessageReceived 中打开警告对话框的任何建议。

谢谢R

Answer 1

这是我为您的问题支付的两分钱:

1. 使用 Activity 上下文来显示对话框或与此相关的任何 UI 相关内容。还有你开始 Activity 的方式，而不是它的打开方式。您可以选择在顶部栏上显示通知并在其上设置 PendingIntent，以便单击它打开所需的 Activity。 Open specific Activity when notification clicked in FCM

2. 与其从 onMessageReceived 获取对 BaseActivity 的引用，不如让它们分离。使用 LocalBroadcastManager 或 Handler 向 Activity 发送消息以显示对话框。这样，如果 Activity 处于打开状态，它将对其进行操作，否则它不会执行任何操作。检查GCM IntentService how to display a pop up on notification receive