android 使用Service进行双进程守护，防止进程被杀

以下所用的方法只适用于防止app太久在后台太久而被系统杀死，在系统的一键清除功能下进程还是会被杀死的。

若要防止进程被系统的一键清除功能杀死，要设置允许当前app自启动。如何设置请看 跳转自启动管理页

定义MyService

public class MyService extends Service {String msg;public MyService() {msg = "Msg from MyService";}@Overridepublic IBinder onBind(Intent intent) {return new MyBinder();}public class MyBinder extends Binder{public String getMsg(){return msg;}}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Intent service = new Intent(this, OtherService.class);startService(service);bindService(service, sc, Context.BIND_IMPORTANT);NotificationCompat.Builder builder = new NotificationCompat.Builder(getApplicationContext());//设置为0，通知栏不可见。设置为1，通知栏可见startForeground(0, builder.build());//返回此参数可以在Service因系统资源紧张被杀死的时候尝试重启return START_STICKY;}private ServiceConnection sc = new ServiceConnection() {@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {//由于配置之后OtherService不在同一线程，无法进行交互
//            OtherService.OtherBinder otherBinder = (OtherService.OtherBinder) service;
//            Toast.makeText(MyService.this, otherBinder.getMsg(), Toast.LENGTH_SHORT).show();Toast.makeText(getApplicationContext(),"绑定MyService",Toast.LENGTH_SHORT).show();}@Overridepublic void onServiceDisconnected(ComponentName name) {// 连接出现了异常断开了，OtherService被杀掉了Toast.makeText(getApplicationContext(),"OtherService挂了",Toast.LENGTH_SHORT).show();Intent service = new Intent(MyService.this, OtherService.class);startService(service);bindService(service, sc, Context.BIND_IMPORTANT);}};
}

定义OtherService

public class OtherService extends Service {String msg;public OtherService() {msg = "Msg from OtherService";}@Overridepublic IBinder onBind(Intent intent) {return new OtherBinder();}public class OtherBinder extends Binder {public String getMsg(){return msg;}}@Overridepublic int onStartCommand(Intent intent, int flags, int startId) {Intent service = new Intent(this, MyService.class);startService(service);bindService(service, sc, Context.BIND_IMPORTANT);return START_STICKY;}private ServiceConnection sc = new ServiceConnection() {@Overridepublic void onServiceConnected(ComponentName name, IBinder service) {
//            MyService.MyBinder myBinder = (MyService.MyBinder) service;
//            Toast.makeText(OtherService.this,myBinder.getMsg(),Toast.LENGTH_SHORT).show();Toast.makeText(getApplicationContext(),"绑定OtherService",Toast.LENGTH_SHORT).show();}@Overridepublic void onServiceDisconnected(ComponentName name) {// 连接出现了异常断开了，MyService被杀掉了Toast.makeText(getApplicationContext(),"MyService挂了",Toast.LENGTH_SHORT).show();Intent service = new Intent(OtherService.this, MyService.class);startService(service);bindService(service, sc, Context.BIND_IMPORTANT);}};
}

配置manifest

开启服务

public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);Intent intent = new Intent(this, MyService.class);startService(intent);Intent intent2 = new Intent(this, OtherService.class);startService(intent2);}}



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