一般情况下,我们使用startService(Intent service)来启动一个服务,但这种情况下无法得到Service对象的引用,通过Android bindService方法启动服务则可以实现此功能。下面通过一个小例子来演示一下:
1:调用者
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,从而可以引用其内部的方法和变量
*
* @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连接成功");
// 执行Service内部自己的方法
myService.excute();
}
};
protected void onDestroy() {
super.onDestroy();
unbindService(connection);
};
}
2:服务者
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("通过Binder得到Service的引用来调用Service内部的方法");
}
@Override
public void onDestroy() {
// 当调用者退出(即使没有调用unbindService)或者主动停止服务时会调用
super.onDestroy();
}
@Override
public boolean onUnbind(Intent intent) {
// 当调用者退出(即使没有调用unbindService)或者主动停止服务时会调用
System.out.println("调用者退出了");
return super.onUnbind(intent);
}
}