Android Service 不被杀死并提高优先级

Android Service 不被杀死有两种思路，一种是将APP设置为系统应用。还有一种是增强service的生命力。即使屏幕背光关闭时也能执行。

因为设置为系统应用须要root。所以一般使用后一种方法：

1.Androidmanifest.xml权限许可：-----------------------------------------------------------------
<uses-permission android:name="android.permission.WAKE_LOCK"/>

<service android:name="com.xx.MyService" ></service>

2.主Activity：----------------------------------------------------------------------------------------

private ServiceConnection conn=null;
private PowerManager.WakeLock mwl;

@Override
protected void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_mian);
PowerManager pm = (PowerManager) getSystemService(Context.POWER_SERVICE);
mwl = pm.newWakeLock(PowerManager.PARTIAL_WAKE_LOCK, "MyTag");
mwl.acquire();//屏幕关闭后保持活动

Intent service=new Intent(this,MyService.class);
startService(service);
conn = new ServiceConnection() {
@Override
public void onServiceDisconnected(ComponentName name) { }
@Override
public void onServiceConnected(ComponentName name, IBinder service) { //……}
};
bindService(service, conn, BIND_AUTO_CREATE);//绑定服务
}

@Override
protected void onDestroy() {
//mwl.release();//释放
unbindService(conn);//解绑
super.onDestroy();
}

------------------------------------------------------------------------------------------------------

Android Service 提高优先级：

public class MyService extendsService{
@Override
public IBinder onBind(Intent intent) {
Notification notification = new Notification(R.drawable.ic_launcher, "title",System.currentTimeMillis());
        PendingIntent pintent = PendingIntent.getService(this, 0, intent, 0);
        notification.setLatestEventInfo(this, "Service",  "service is running", pintent);
        startForeground(0, notification);//设置最高级进程。 id 为 0状态栏的 notification 将不会显示
return new MyBinder();
}
class MyBinder extendsBinder{ //……  }
@Override
public void onDestroy() {
stopForeground(true);//取消最高级进程
super.onDestroy();
}
}