Service的使用（三）绑定服务

创建Bound Service

定义服务

public class MyService extends Service {

private DownloadBinder mBinder = new DownloadBinder();

//定义Binder接口
class DownloadBinder extends Binder {
public void startDownload() {
Log.d("MyService", "startDownload executed");
}
public int getProgress() {
Log.d("MyService", "getProgress executed");
return 0;
}
}
@Override
public IBinder onBind(Intent intent) {
return mBinder;
}

……
}

启动服务

定义ServiceConnection

@Override
public void onServiceDisconnected(ComponentName name) {

}

@Override
public void onServiceConnected(ComponentName name,IBinder service) {

//获取Service里面的binder接口实例，进行通信
downloadBinder = (MyService.DownloadBinder) service;
downloadBinder.startDownload();
downloadBinder.getProgress();
}

绑定与解绑

绑定

Intent bindIntent = new Intent(this, MyService.class);

//第一个参数是Intent，第二个是ServiceConnection，第三个是标志位：
//这里表示在活动和服务进行绑定后自动创建服务,即会调用onCreate但不会调用startCommand
bindService(bindIntent, connection, BIND_AUTO_CREATE);

解绑

//只要一个参数就是ServiceConntion
unbindService(connection)