当应用程序处于后台时，如何从通知中打开特定屏幕？

Question

我正在尝试打开特定屏幕，该屏幕的启动取决于通知。 我收到通知，但打不开屏幕，请帮我找出解决方案。

    public static void sendChatNotification(Context context, String title, String messageBody, int notificaionId) {
        Intent intent = new Intent(context, ChattingActivity.class);
        intent.putExtra("isFromNotification",true);
        intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP | Intent.FLAG_RECEIVER_FOREGROUND);
         PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_ONE_SHOT);
       Uri defaultSoundUri = Uri.parse(ContentResolver.SCHEME_ANDROID_RESOURCE
        + "://" + context.getPackageName() + "/raw/incoming");
           Bitmap largeIcon = BitmapFactory.decodeResource(context.getResources(),
    R.mipmap.ic_launcher);
      NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context, notificationChannelIdChat)
        .setSmallIcon(R.drawable.vector_app_logo_notification_status_bar)
        .setLargeIcon(largeIcon)
        .setContentTitle(title)
        .setStyle(new NotificationCompat.BigTextStyle()
                .bigText(messageBody))
        .setPriority(NotificationCompat.PRIORITY_MAX)
        .setVibrate(new long[]{1000, 1000})
        .setAutoCancel(true)
        .setTicker(context.getString(R.string.newMessageFrom))
        .setGroup("chat")
        .setGroupSummary(true)
        .setContentIntent(pendingIntent);
  }

Answer 1

• 在Android应用程序中正确设置通知任务。
• 向您有应用程序打开屏幕的设备发送通知。
• 打开代码。并在启动屏幕中写入命令。

Splashscreen.java -> onCreate()

       @Override
        protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_splash);
       
        onNewIntent(getIntent());          //  onNewIntent  is the Main line.
       }

• 退出 onCreate() 方法后，按 Alt + Insert 按钮覆盖 newIntent() 方法。

• 在newIntent()方法

  中编写代码

      @Override
      protected void onNewIntent(Intent intent) {
      super.onNewIntent(intent);
      if(intent.hasExtra("action")){
      if (intent.getStringExtra("action").equals("112")){
           Intent intent1 = new Intent(this, MainActivity.class);  // opening in **Main Activity** to *redirect* in **Chat Screen**
           intent1.putExtra("action","112");   //  here "112" is the chat notification action.
           startActivity(intent1);
         }
        }
      }
  

• 打开 MainActivity.java -> onCreate()

• 如果意图有可用数据，则编写代码以找出其动作的意图。

       protected void onCreate(Bundle savedInstanceState) {
           super.onCreate(savedInstanceState);
           setContentView(R.layout.activity_main);
          // check if intent have action in data.
          if(getIntent().hasExtra("action")){  
  
          // check if data available then action == 112 is available or not.
          if(getIntent().getStringExtra("action").equals("112")){   
  
          // opening ChattingActivity.java if all scenario is not nullable.
          startActivity(new Intent(this,ChattingActivity.class));  
        }
       }