遇到难题求高手帮忙解决--Android P开始监听不到关机广播

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.tcldou.dou">
 4 
 5     <application
 6         android:allowBackup="true"
 7         android:icon="@mipmap/ic_launcher"
 8         android:label="@string/app_name"
 9         android:roundIcon="@mipmap/ic_launcher_round"
10         android:supportsRtl="true"
11         android:theme="@style/AppTheme">
12 
13         <receiver
14             android:name=".ShutDownBroadcastReceiver"
15             android:exported="true">
16             <!--<intent-filter>-->
17                 <!--<action android:name="android.intent.action.BOOT_COMPLETED" />-->
18                 <!--<category android:name="android.intent.category.HOME" />-->
19             <!--</intent-filter>-->
20 
21             <intent-filter>
22                 <action android:name="android.intent.action.ACTION_SHUTDOWN" />
23                 <!--<category android:name="android.intent.category.HOME" />-->
24             </intent-filter>
25         </receiver>
26     </application>
27 
28     <uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE" />
29     <uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
30     <uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
31     <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
32     <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
33     <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
34 
35 </manifest>

 1 import android.content.BroadcastReceiver;
 2 import android.content.Context;
 3 import android.content.Intent;
 4 
 5 import java.io.File;
 6 import java.io.FileWriter;
 7 import java.io.IOException;
 8 import java.text.SimpleDateFormat;
 9 import java.util.Date;
10 
11 public class ShutDownBroadcastReceiver extends BroadcastReceiver {
12     @Override
13     public void onReceive(Context context, Intent intent){
14         System.out.println("---------Shut down-------------");
15         File file = new File ("/sdcard/result.txt");
16         try {
17             if(!file.exists())
18             {
19                 file.createNewFile();
20             }
21             FileWriter writer = null;
22 
23                 writer = new FileWriter(file, true);
24 
25             writer.write("Shut_down [" + new SimpleDateFormat("yyyy-MM-dd HH:mm:ss").format((new Date()).getTime()) + "]\n");
26             writer.close();
27         } catch (IOException e) {
28             e.printStackTrace();
29         }
30     }
31 }