如何在Android中通过推送通知打开特定活动

Question

当应用程序关闭时，我在使用FCM的聊天中收到有关新消息的通知。当我点击它时，我想打开聊天活动，但主活动会打开。

点击推送通知将打开主活动。在其中，我可以从intent获得一种类型的通知，并打开另一个活动：

override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    processNotification()
}

private fun processNotification() {
    val notificationCategory = intent?.extras?.getString("category") ?: return
    if (notificationCategory == "new_message") {
        startMessagingActivity()
        finish()
    }
}

在我看来，这种方法既肮脏又不方便。是否可以指定单击推送通知时将打开的活动？

编辑：解决问题的步骤：

>

为要打开的活动添加意图过滤器：

<activity android:name=".messages.chatroom.ChatRoomActivity">
    <intent-filter>
        <action android:name="*your-action-name*"/>
        <category android:name="android.intent.category.DEFAULT"/>
    </intent-filter>
</activity>

向FCM消息添加click_action="you-action-name"字段。

Android将自动打开活动与行动相同click_action

Answer 1

首先你应该有特定的有效负载与您的通知在您的情况下它应该是一个ID为特定的聊天然后您可以使用该ID做什么你想做使用此代码

 type = remoteMessage.getData().get("type");
if(type.equals("1")) { // here you can just detremine the activity you want to open
              Intent intent;
              PendingIntent pendingIntent;
              NotificationCompat.Builder builder;
              if (notifManager == null) {
                  notifManager = (NotificationManager) getSystemService
                          (Context.NOTIFICATION_SERVICE);
              }

              intent = new Intent (this, Admin_page.class); // here chose the activity
              if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
                  int importance = NotificationManager.IMPORTANCE_HIGH;
                  if (mChannel == null) {
                      NotificationChannel mChannel = new NotificationChannel
                              ("0", title, importance);
                      mChannel.setDescription (body);
                      mChannel.enableVibration (true);
                      mChannel.setVibrationPattern (new long[]
                              {100, 200, 300, 400, 500, 400, 300, 200, 400});
                      notifManager.createNotificationChannel (mChannel);
                  }
                  builder = new NotificationCompat.Builder (this, "0");

                  intent.setFlags (Intent.FLAG_ACTIVITY_CLEAR_TOP |
                          Intent.FLAG_ACTIVITY_SINGLE_TOP);
                  pendingIntent = PendingIntent.getActivity (this, 0, intent, 0);
                  builder.setContentTitle (title)  // flare_icon_30
                          .setSmallIcon(R.drawable.logo_app).setTicker(title).setWhen(0)
                          .setContentText (body)  // required
                          .setDefaults (Notification.DEFAULT_ALL)
                          .setAutoCancel (true)
                          .setLargeIcon(BitmapFactory.decodeResource(this.getResources(), R.drawable.logo_app))
                          .setContentIntent (pendingIntent)
                          .setSound (RingtoneManager.getDefaultUri
                                  (RingtoneManager.TYPE_NOTIFICATION))
                          .setVibrate (new long[]{100, 200, 300, 400,
                                  500, 400, 300, 200, 400});
              } else {

                  builder = new NotificationCompat.Builder (this);

                  intent.setFlags (Intent.FLAG_ACTIVITY_CLEAR_TOP |
                          Intent.FLAG_ACTIVITY_SINGLE_TOP);
                  pendingIntent = PendingIntent.getActivity (this, 0, intent, 0);
                  builder.setContentTitle (title)
                          .setSmallIcon(R.drawable.logo_app).setTicker(title).setWhen(0)
                          .setContentText (body)  // required
                          .setDefaults (Notification.DEFAULT_ALL)
                          .setAutoCancel (true)
                          .setLargeIcon(BitmapFactory.decodeResource(this.getResources(), R.drawable.logo_app))

                          .setContentIntent (pendingIntent)
                          .setSound (RingtoneManager.getDefaultUri
                                  (RingtoneManager.TYPE_NOTIFICATION))
                          .setVibrate (new long[]{100, 200, 300, 400, 500,
                                  400, 300, 200, 400})
                          .setPriority (Notification.PRIORITY_HIGH);
              } // else if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
              Notification notification = builder.build ();
              notifManager.notify((int)date.getTime(), notification);
          }

希望这对你有用

Answer 2

你需要使用Android深度链接。

你的通知（FCM）应该有一些数据（消息ID取决于你的设计）的有效载荷，用于你想要使用的给定屏幕，在这种情况下，你的聊天活动。

聊天活动需要在清单中声明主机和模式，下面是深度链接的说明和代码：

https://developer.android.com/training/app-links/deep-linking

快乐编码。