Android 12 Indirect notification activity start (trampoline) from xx blocked solution

foreword

Recently, I am writing a function to open after a click notification is issued Broadcastand Broadcast Receiversome things are processed in it . ActivityThere is no problem when debugging, but it cannot be opened when the notification is clicked after the app is packaged Activity. The following debug information can be seen in Logcat:Indirect notification activity start (trampoline) from xx blocked

about the question

After testing, it is found that the method of broadcast receiver has been successfully triggered , but the problem is that it cannot be opened onReceivewhen the notification is clicked .间接地Activity

After consulting the relevant information, Android 12I think that the application of the target platform has some behavior changes. Among them, the restriction notification trampoline makes it impossible to open indirectly Activity.

Notification trampoline: When a user interacts with a notification, some apps respond to a notification tap by launching an app component such as , which ultimately launches an activity that the user ultimately sees and interacts with. BroadcastThis application component is called the notification trampoline.

How to solve

train of thought

I built one that is not perceived by the user Activity, and opens this directly when the notification is tapped 跳板Activity. Process data, send broadcasts, start services, etc. in 跳板Activitythe onCreatemethod, and finally start the one you want to open Activity. After performing all the above operations, call finishthe method to end this跳板Activity

accomplish

1. Create a new empty one Activity(do not check Generate a Layout File)

2. AndroidManifest.xmlconfigure in Activity_

<activity
    android:name=".TrampolineActivity"
    android:excludeFromRecents="true"
    android:exported="false"
    android:theme="@android:style/Theme.Translucent.NoTitleBar"
    android:label="TrampolineActivity" />

3. TrampolineActivityWrite business code in

package xxx;
import static xxx.NOTIFICATION_PRESS_ACTION;

import androidx.appcompat.app.AppCompatActivity;

import android.content.Intent;
import android.os.Bundle;

public class TrampolineActivity extends AppCompatActivity {
    
    

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    
    
        super.onCreate(savedInstanceState);
        
        // 编写你的代码，发送 Broadcast 等
        
        Intent mainActivityIntent = new Intent(this, MainActivity.class);
        mainActivityIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
        startActivity(mainActivityIntent); // 启动要打开的Activity
        
        finish(); // 结束跳板Activity
    }
}

4. set NotificationupContentIntent

Intent intent = new Intent(context, TrampolineActivity.class);
PendingIntent pendingIntent = PendingIntent.getActivity(context, gatheringEventItem.getId(), intent, PendingIntent.FLAG_UPDATE_CURRENT | PendingIntent.FLAG_IMMUTABLE);

Notification notification = new NotificationCompat.Builder(context, NOTIFICATION_CHANNEL_ID)
        .setContentTitle("通知标题")
        .setContentText("通知内容")
        .setContentIntent(pendingIntent)
        .setAutoCancel(true)
        .build();