一般情況下我們使用startService(Intent service)來啟動一個服務,但這種情況下無法得到Service對象的引用,通過bindService方法啟動服務則可以實現此功能。下面給一個小例子演示一下:
1.調用者
- package com.zhf.local;
-
-
- import Android.app.Activity;
- import android.content.ComponentName;
- import android.content.Context;
- import android.content.Intent;
- import android.content.ServiceConnection;
- import android.os.Bundle;
- import android.os.IBinder;
-
- /**
- * 此例的目的就是拿到MyService的引用,從而可以引用其內部的方法和變量
- * @author Administrator
- *
- */
- public class LocalServiceActivity extends Activity {
- /** Called when the activity is first created. */
- private MyService myService;
-
- @Override
- public void onCreate(Bundle savedInstanceState) {
- super.onCreate(savedInstanceState);
- setContentView(R.layout.main);
-
- Intent intent = new Intent(this, MyService.class);
- bindService(intent, connection, Context.BIND_AUTO_CREATE);
- }
-
- private ServiceConnection connection = new ServiceConnection() {
-
- @Override
- public void onServiceDisconnected(ComponentName name) {
- myService = null;
- }
-
- @Override
- public void onServiceConnected(ComponentName name, IBinder service) {
- myService = ((MyService.MyBinder) service).getService();
- System.out.println("Service連接成功");
- //執行Service內部自己的方法
- myService.excute();
- }
- };
-
- protected void onDestroy() {
- super.onDestroy();
- unbindService(connection);
- };
- }
2.服務者
- package com.zhf.local;
-
- import android.app.Service;
- import android.content.Intent;
- import android.os.Binder;
- import android.os.IBinder;
-
- public class MyService extends Service {
- private final IBinder binder=new MyBinder();
- @Override
- public IBinder onBind(Intent intent) {
- return binder;
- }
-
- public class MyBinder extends Binder{
- MyService getService(){
- return MyService.this;
- }
- }
-
- public void excute(){
- System.out.println("通過Binder得到Service的引用來調用Service內部的方法");
- }
-
- @Override
- public void onDestroy() {
- //當調用者退出(即使沒有調用unbindService)或者主動停止服務時會調用
- super.onDestroy();
- }
-
- @Override
- public boolean onUnbind(Intent intent) {
- //當調用者退出(即使沒有調用unbindService)或者主動停止服務時會調用
- System.out.println("調用者退出了");
- return super.onUnbind(intent);
- }
- }