Android 服务的入门

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public class MainActivity extends AppCompatActivity {    private Myconn conn;    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }    //点击按钮 开启服务 通过startservice    public void click1(View v) {        Intent intent = new Intent(this, DemoService.class);        startService(intent); // 开启服务    }    public void click2(View v) {        Intent intent = new Intent(this, DemoService.class);        stopService(intent);    }    //点击按钮 绑定服务 开启服务的第二种方式    public void click3(View v) {        Intent intent = new Intent(this,DemoService.class);        //连接到DemoService这个服务        conn = new Myconn();        bindService(intent, conn, BIND_AUTO_CREATE);    }    //点击按钮手动解绑服务    public void click4(View v) {        unbindService(conn);    }    @Override    protected void onDestroy() {        //当Activity销毁的时候 要解绑服务        unbindService(conn);        super.onDestroy();    }    //定义一个类 用来监视服务的状态    private class Myconn implements ServiceConnection{        //当服务连接成功调用        @Override        public void onServiceConnected(ComponentName name, IBinder service) {            Log.d("jojo", "onServiceConnected: ");        }        //失去连接时调用        @Override        public void onServiceDisconnected(ComponentName name) {        }    }}

public class DemoService extends Service {    private static final String TAG = "jojo";    public DemoService() {    }    @Override    public IBinder onBind(Intent intent) {        // TODO: Return the communication channel to the service.//        throw new UnsupportedOperationException("Not yet implemented");        Log.d(TAG, "onBind: ");        return null;    }    //当服务第一次创建的时候调用    @Override    public void onCreate() {        Log.d(TAG, "onCreate: ");        super.onCreate();    }    @Override    public int onStartCommand(Intent intent, int flags, int startId) {        Log.d(TAG, "onStartCommand: ");        return super.onStartCommand(intent, flags, startId);    }    //当服务销毁的时候调用    @Override    public void onDestroy() {        Log.d(TAG, "onDestroy: ");        super.onDestroy();    }    @Override    public boolean onUnbind(Intent intent) {        Log.d(TAG, "onUnbind: ");        return super.onUnbind(intent);    }}

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