android的四大组件之一Service(服务的绑定)
怎么绑定服务,又怎么解除服务,代码如下:
MainActivity.java源码:
package com.example.lesson14_binder;
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;
import android.view.View;
/**
* 2013-6-18 下午2:22:00
*
* @author 乔晓松
*/
public class MainActivity extends Activity {
public MyService myService;
// 内部类获取连接对象
public ServiceConnection conn = new ServiceConnection() {
// 连接失败后调用的方法
@Override
public void onServiceDisconnected(ComponentName name) {
myService = null;
System.out.println("-----service Faild");
}
// 连接成功后调用的方法
@Override
public void onServiceConnected(ComponentName name, IBinder service) {
myService = ((MyService.MyBinder) service).getService();
System.out.println("-----service connection");
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
}
// 绑定服务
public void bindService(View v) {
Intent serviceIntent = new Intent(this, MyService.class);
this.bindService(serviceIntent, conn, Context.BIND_AUTO_CREATE);
System.out.println("---------bindService");
}
// 解除绑定
public void unBindService(View v) {
this.unbindService(conn);
System.out.println("---------unBindService");
}
}
MyService.java源码:
package com.example.lesson14_binder;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
/**
* 2013-6-18 下午2:16:37
*
* @author 乔晓松
*/
public class MyService extends Service {
public MyBinder myBinder = new MyBinder();
// 绑定的时候执行
@Override
public IBinder onBind(Intent intent) {
System.out.println("------onBind");
return myBinder;
}
// 重新绑定的时候执行
@Override
public void onRebind(Intent intent) {
super.onRebind(intent);
System.out.println("------onRebind");
}
// 解除绑定的时候执行
@Override
public boolean onUnbind(Intent intent) {
System.out.println("------onUnbind");
return super.onUnbind(intent);
}
// 创建服务的时候执行
@Override
public void onCreate() {
super.onCreate();
System.out.println("------onCreate");
}
// 开启服务的时候执行
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
System.out.println("------onStartCommand");
return super.onStartCommand(intent, flags, startId);
}
// 销毁服务的时候执行
@Override
public void onDestroy() {
super.onDestroy();
System.out.println("------onDestroy");
}
// 继承绑定类的内部类
public class MyBinder extends Binder {
public MyService getService() {
return MyService.this;
}
}
}
布局文件的代码:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:paddingBottom="@dimen/activity_vertical_margin"
android:paddingLeft="@dimen/activity_horizontal_margin"
android:paddingRight="@dimen/activity_horizontal_margin"
android:paddingTop="@dimen/activity_vertical_margin"
tools:context=".MainActivity" >
<Button
android:id="@+id/btn_start"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_alignParentTop="true"
android:layout_marginTop="59dp"
android:onClick="bindService"
android:text="@string/btn_start" />
<Button
android:id="@+id/btn_end"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignLeft="@+id/btn_start"
android:layout_alignRight="@+id/btn_start"
android:layout_below="@+id/btn_start"
android:layout_marginTop="58dp"
android:onClick="unBindService"
android:text="@string/btn_end" />
</RelativeLayout>