Android9.0保活后台service

Android8.0之后Service变为后台后很开就会被杀死。因此要采取一定的措施进行保活。
启动service:

Intent i=new Intent(context,TestIntentService.class);
if(Build.VERSION.SDK_INT>=Build.VERSION_CODES.O){
context.startForegroundService(i);
}else{
context.startService(i);
}

Service类为：
package com.example.myapplicationww;

import android.app.IntentService;
import android.app.Notification;
import android.app.NotificationChannel;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.app.Service;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.BatteryManager;
import android.os.Build;
import android.os.Handler;
import android.os.IBinder;
import android.util.Log;
import android.widget.Toast;

import androidx.annotation.Nullable;
import androidx.core.app.NotificationCompat;

public class TestIntentService extends Service {
private static final String TAG = TestIntentService.class.getSimpleName();
private USBBroadcastReceiver usbBroadcastReceiver;
@Nullable
@Override
public IBinder onBind(Intent intent) {
return null;
}

@Override
public void onCreate() {
    super.onCreate();
    //设置点击跳转
    Context context=getApplicationContext();
    Intent intent = new Intent(context, MainActivity.class);
    intent.setFlags(Intent.FLAG_ACTIVITY_SINGLE_TOP);
    PendingIntent pendingIntent = PendingIntent.getActivity(context, 0, intent, PendingIntent.FLAG_CANCEL_CURRENT);

    String id = "1";
    String name = "channel_name_1";
    NotificationManager notificationManager = (NotificationManager) context.getSystemService(Context.NOTIFICATION_SERVICE);
    Notification notification = null;
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
        NotificationChannel mChannel = new NotificationChannel(id, name, NotificationManager.IMPORTANCE_DEFAULT);
        mChannel.setSound(null, null);
        notificationManager.createNotificationChannel(mChannel);
        notification = new Notification.Builder(context)
                .setChannelId(id)
                .setContentTitle(context.getResources().getString(R.string.app_name))
                .setContentIntent(pendingIntent)
                .setAutoCancel(false)// 设置这个标志当用户单击面板就可以让通知将自动取消
                .setOngoing(true)// true，设置他为一个正在进行的通知。他们通常是用来表示一个后台任务,用户积极参与(如播放音乐)或以某种方式正在等待,因此占用设备(如一个文件下载,同步操作,主动网络连接)
                .setSmallIcon(R.drawable.ic_launcher_background).build();
    } else {
        NotificationCompat.Builder notificationBuilder = new NotificationCompat.Builder(context)
                .setContentTitle(context.getResources().getString(R.string.app_name))
                .setContentIntent(pendingIntent)
                .setPriority(Notification.PRIORITY_DEFAULT)// 设置该通知优先级
                .setAutoCancel(false)// 设置这个标志当用户单击面板就可以让通知将自动取消
                .setOngoing(true)// true，设置他为一个正在进行的通知。他们通常是用来表示一个后台任务,用户积极参与(如播放音乐)或以某种方式正在等待,因此占用设备(如一个文件下载,同步操作,主动网络连接)
                .setSmallIcon(R.drawable.ic_launcher_background);
        notification = notificationBuilder.build();
    }
    startForeground(1, notification);

    Log.d(TAG,"service onCreate");

}

@Override
public int onStartCommand(Intent intent, int flags, int startId) {
    Log.d(TAG,"service onStartCommand");
    usbBroadcastReceiver=new USBBroadcastReceiver();
    /*IntentFilter intentFilter = new IntentFilter();
    intentFilter.addAction(Intent.ACTION_POWER_CONNECTED);
    intentFilter.addAction(Intent.ACTION_POWER_DISCONNECTED);
    intentFilter.addAction(BatteryManager.ACTION_CHARGING);
    intentFilter.addAction(BatteryManager.ACTION_DISCHARGING);
    getApplicationContext().registerReceiver(usbBroadcastReceiver, intentFilter);*/
    return START_STICKY;
}

@Override
public void onDestroy() {
    super.onDestroy();
    Log.d(TAG,"service onDestroy");
    unregisterReceiver(usbBroadcastReceiver);
}

}