Android基础之服务的创建启动和停止

矫情吗；* 2022-05-21 00:59 246阅读 0赞

1.创建一个服务，让其继承自Serivce,并重写onBind方法，服务的创建是通过onCreate（）方法实现，启动通过onStartCommand()方法，停止服务通过onDestory()方法。  
2.没创建一个服务都会调用onCreate(),onStartCommand()方法，但是当一直启动服务，并且次数增加时，就会只调用onStartCommand()方法了，服务的停止调用onDestory()方法，停止后启动服务仍会调用onCreate(),onStartCommand()方法。  
下面通过打印日志查看服务的创建启动停止过程。

package com.example.apple.service.service;
    
    import android.app.Service;
    import android.content.Intent;
    import android.os.IBinder;
    import android.util.Log;
    
    public class MyService extends Service { 
    
        private final String TAG="MyService";
    
        public MyService() {
        }
    
        @Override
        public IBinder onBind(Intent intent) {
            // TODO: Return the communication channel to the service.
            throw new UnsupportedOperationException("Not yet implemented");
        }
    
        @Override
        public void onCreate() {
            super.onCreate();
            Log.d(TAG,"onCreate myService");
        }
    
        @Override
        public int onStartCommand(Intent intent, int flags, int startId) {
            Log.d(TAG,"onStartCommand myService");
            return super.onStartCommand(intent, flags, startId);
        }
    
        @Override
        public void onDestroy() {
            super.onDestroy();
            Log.d(TAG,"onDestroy myService");
        }
    }

MainActivity.class:

public class MainActivity extends AppCompatActivity implements View.OnClickListener { 
        private Button btn_start;
        private Button btn_stop;
    
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
            btn_start=(Button)findViewById(R.id.start_service);
            btn_stop=(Button)findViewById(R.id.stop_service);
    
            btn_start.setOnClickListener(this);
            btn_stop.setOnClickListener(this);
        }
    
        @Override
        public void onClick(View v) {
            switch (v.getId()){
                case R.id.start_service:
                    startService(new Intent(this, MyService.class));
                    break;
    
                case R.id.stop_service:
                    stopService(new Intent(this,MyService.class));
                    break;
            }
        }
    }

效果图：  
![这里写图片描述][70]  
Logcat打印日志：

06-27 09:08:04.023 2544-2544/com.example.apple.service D/MyService: onCreate myService
    06-27 09:08:04.025 2544-2544/com.example.apple.service D/MyService: onStartCommand myService
    06-27 09:08:07.586 2544-2544/com.example.apple.service D/MyService: onDestroy myService
    06-27 09:08:09.821 2544-2544/com.example.apple.service D/MyService: onCreate myService
    06-27 09:08:09.822 2544-2544/com.example.apple.service D/MyService: onStartCommand myService
    06-27 09:08:11.246 2544-2544/com.example.apple.service D/MyService: onDestroy myService
    06-27 09:08:13.132 2544-2544/com.example.apple.service D/MyService: onCreate myService
    06-27 09:08:13.137 2544-2544/com.example.apple.service D/MyService: onStartCommand myService
    06-27 09:08:14.673 2544-2544/com.example.apple.service D/MyService: onStartCommand myService
    06-27 09:08:16.858 2544-2544/com.example.apple.service D/MyService: onStartCommand myService
    06-27 09:08:17.703 2544-2544/com.example.apple.service D/MyService: onStartCommand myService
    06-27 09:08:18.460 2544-2544/com.example.apple.service D/MyService: onStartCommand myService
    06-27 09:08:23.127 2544-2544/com.example.apple.service D/MyService: onDestroy myService
    06-27 09:08:25.128 2544-2544/com.example.apple.service D/MyService: onCreate myService
    06-27 09:08:25.140 2544-2544/com.example.apple.service D/MyService: onStartCommand myService

[70]: /images/20220521/b8857b3658b14cf786613fecab7e3f92.png