使用活动和片段处理推送通知导航

Question

我开发了一个具有Firebase推送通知功能的应用程序。我创建了一个MainActivity和五个片段A，B，C，D，E。当我单击“推送通知”消息时，我想显示片段C，当我的应用程序在屏幕上打开时，它可以正常工作。

但是，当我杀死应用程序，然后推送通知到来时，我单击了推送通知，MainActivity加载了片段A，该片段是我最初带有MainActivity的片段。

我的应用程序流程：

Splash Screen -> Login Screen (Silent Login) -> Main Activity -> Load a Specific Fragment

我的代码：

private void sendNotification(String title, String messageBody, int senderId) {
        Intent intent = new Intent(this, MainActivity.class);
        intent.putExtra(ARG_NOTIFICATION_FOR, ConstantValues.NOTIFICATION_FOR_CHAT_SCREEN);
        intent.putExtra(ARG_SENDER_ID, senderId);
        intent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
        PendingIntent pendingIntent = PendingIntent.getActivity(getApplicationContext(), 0 /* Request code */, intent, PendingIntent.FLAG_UPDATE_CURRENT);

        Uri defaultSoundUri= RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION);
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(this)
                .setSmallIcon(R.mipmap.ic_launcher)
                .setContentTitle(title)
                .setContentText(messageBody)
                .setAutoCancel(true)
                .setSound(defaultSoundUri)
                .setContentIntent(pendingIntent);

        NotificationManager notificationManager = (NotificationManager) getSystemService(Context.NOTIFICATION_SERVICE);
        notificationManager.notify(0 /* ID of notification */, notificationBuilder.build());
}

对于MainActivity，如下所示：

if(getIntent() != null)
{
  if (getIntent().hasExtra(ARG_NOTIFICATION_FOR))
  {
    //Load Fragment C
  }
}

当我单击“推送通知”图标时，应用程序从启动屏幕以静默登录方式打开->主活动->加载片段A

主要活动没有hasExtra（ARG_NOTIFICATION_FOR）

Answer 1

您的推送通知暂挂意图需要向活动发送参数，以确定从图标或通知中打开应用程序。

 Intent notificationIntent = new Intent(getApplicationContext(), YourActivity.class);
    notificationIntent.putExtra("FromNotification", true);//or fragment Id
    notificationIntent.addFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_ACTIVITY_CLEAR_TOP);
    PendingIntent pendingNotificationIntent = PendingIntent.getActivity(getApplicationContext(),notificationIndex,notificationIntent,PendingIntent.FLAG_UPDATE_CURRENT);
    notification.flags |= Notification.FLAG_AUTO_CANCEL;
    notification.setLatestEventInfo(getApplicationContext(), notificationTitle, notificationMessage, pendingNotificationIntent);

为此，您应该创建自定义通知。检出此链接https://developer.android.com/training/notify-user/build-notification.html
也在onCreate方法内，您应该从通知中接收数据。

protected void onCreate(Bundle bundle){
       super.onCreate(bundle);
       //bla bla bla
       boolean fromNotification = getIntent().getBooleanExtra("FromNotification",false);
       if(fromNotification){
            //open fragment c
       }else{
            //open fragment a
       }
}