android服务组件之生命周期1

Service生命周期

启动服务的时候调用onCreate()和onStartCommand，onCreate()方法只执行一次。若多次启动服务则只执行onStartCommand方法。停止服务则只是执行onDestroy()方法

onStartCommand可以携带数据

public class MyService extends Service {



private final String TAG="MyService";

@Override

public void onCreate() {

Log.i(TAG, "<<<onCreate");

super.onCreate();

}



//获得资源

@Override

public int onStartCommand(Intent intent, int flags, int startId) {

Log.i(TAG, "<<<onStartCommand"+intent.getStringExtra("service"));

return super.onStartCommand(intent, flags, startId);

}



@Override

public IBinder onBind(Intent arg0) {

Log.i(TAG, "<<<onBind");

return null;

}



//释放资源

@Override

public void onDestroy() {

Log.i(TAG, "<<<onDestroy");

super.onDestroy();

}





}



public class MainActivity extends Activity implements OnClickListener{



private Button btnStart=null;

private Button btnStop=null;

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_main);

btnStart=(Button)this.findViewById(R.id.button1);

btnStop=(Button)this.findViewById(R.id.button2);

btnStart.setOnClickListener(this);

btnStop.setOnClickListener(this);

}



@Override

public boolean onCreateOptionsMenu(Menu menu) {

// Inflate the menu; this adds items to the action bar if it is present.

getMenuInflater().inflate(R.menu.main, menu);

return true;

}



@Override

public void onClick(View v) {

switch(v.getId())

{

//启动服务

case R.id.button1:

Intent intent=new Intent(MainActivity.this,MyService.class);

intent.putExtra("service","服务器");

startService(intent);

break;

//关闭服务

case R.id.button2:

Intent intent1=new Intent(MainActivity.this,MyService.class);

stopService(intent1);

}

}



}