Activity与本地Service的绑定

标签：绑定service

在Android应用程序中，Activity负责界面的显示，Service负责后台工作，当然后台和界面是需要交互的，所以Activity需要和Service交互.

比较常用的是Activity和本地Service的交互，本文介绍的便是这种，最终实现Activity和Service都能很方便地调用对方的public方法。

其实只要让Activity和Service绑定之后，分别拥有对方的引用就可以了。

以MainActivity和MyService为例

创建一个服务类MyService.java

public class MyService extends Service {

	private MainActivity activity;
	

	@Override
	public IBinder onBind(Intent arg0) {
		return new MyBinder();
	}

	/**
	 * 与activity绑定后返回的Binder
	 */
	public class MyBinder extends Binder {
		// 获取service对象的引用
		public MyService getService() {
			return MyService.this;
		}
	}
   
	public void setActivity( MainActivity _activity){
		this.activity =  _activity;
	}
	
}

让Service中拥有一个Activity类型的成员，并提供setActivity()方法

注意要在androidManifest中声明该Service

<service
            android:name=".MyService"
            ></service>

public class MainActivity extends Activity {

// 本地服务
	private MyService mLocalService;

@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);

		bindLocalService();
	}

	/**
	 * 创建并绑定本地Service
	 * */
	private void bindLocalService() {
		Intent bindIntent = new Intent(this, MyService.class);
		bindService(bindIntent, localServiceConnection, BIND_AUTO_CREATE);
	}

/**
	 * 绑定本地服务的ServiceConnection类
	 */
	ServiceConnection localServiceConnection = new ServiceConnection() {

		@Override
		public void onServiceDisconnected(ComponentName arg0) {
			mLocalService = null;
		}

		@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			MyBinder myBinder = (MyService.MyBinder) service;
			mLocalService = myBinder.getService();
			mLocalService.setActivity(MainActivity.this);

		}
	};

}

@Override
		public void onServiceConnected(ComponentName name, IBinder service) {
			MyBinder myBinder = (MyService.MyBinder) service;
			mLocalService = myBinder.getService();
			mLocalService.setActivity(MainActivity.this);

		}

这样一来，就可以调用对方里的public方法了

比如

1. MyService里有一个方法

public void print(String s){
   System.out.println("is in service --> "+s);
}

mLocalService.print("call from activity");

public void updateTextView(String s){
   textView.setText(s);
}

activity.updateTextView("service call the fun in activity");

	public static Handler handler = new Handler(){
		public void handleMessage(android.os.Message msg) {
			System.out.println("handler say something");
		}
	};

private Handler mHandler = MainActivity.handler;

还有用广播Broadcast来实现Service通知UI更新的，不过这样消耗太大，不建议这么做

上面的做法，即实现了Service与Activity的交互，也让这两个类的尽量独立解藕，方便类的维护。

Activity与本地Service的绑定

标签：绑定service

原文地址：http://blog.csdn.net/guige_csdn/article/details/47809895