绑定Service
一个Activity程序启动Service之后，Service就会自动留在后台运行，一般需要一个前台界面来
配置Service的运行，此时则需要将一个Activity和一个Service绑定在一起
Ibinder是通过Service返回到Activity程序上的一个连接的绑定对象，而后这个对象要通过ServiceConnection接口进行控制。
1、先单击“启动Service”，得如下输出：
2、最后单击“绑定Service”，得如下输出：
1、如果不单击“启动Service”，而是直接单击“绑定Service”，得如下输出：
2、最后按后退键（或者是单击“解除Service绑定”）都得如下输出：
在main.xml中：
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:background="#000000"
android:gravity="center_horizontal">
<Button
android:id="@+id/start"
android:layout_marginTop="8dp"
android:layout_width="160dp"
android:layout_height="40dp"
android:background="#3399ff"
android:textColor="#ffffff"
android:text="启动Service" />
<Button
android:id="@+id/stop"
android:layout_marginTop="8dp"
android:layout_width="160dp"
android:layout_height="40dp"
android:background="#3399ff"
android:textColor="#ffffff"
android:text="停止Service" />
<Button
android:id="@+id/bind"
android:layout_marginTop="8dp"
android:layout_width="160dp"
android:layout_height="40dp"
android:background="#3399ff"
android:textColor="#ffffff"
android:text="绑定Service" />
<Button
android:id="@+id/unbind"
android:layout_marginTop="8dp"
android:layout_width="160dp"
android:layout_height="40dp"
android:background="#3399ff"
android:textColor="#ffffff"
android:text="解除Service绑定" />
</LinearLayout>
在MyServiceDemo.java中：
package com.li.service;
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.os.RemoteException;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MyServiceDemo extends Activity {
private Button start,stop,bind,unbind ;
private ServiceConnection serviceConnection = new ServiceConnection() {
public void onServiceDisconnected(ComponentName name) {
System.out.println("### Service Connect Failure");
}
public void onServiceConnected(ComponentName name, IBinder service) {
try {
System.out.println("### Service Connect Success service = " + service.getInterfaceDescriptor());
} catch (RemoteException e) {
e.printStackTrace();
}
}
};
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
super.setContentView(R.layout.main);
this.start = (Button) super.findViewById(R.id.start) ;
this.stop = (Button) super.findViewById(R.id.stop) ;
this.start.setOnClickListener(new StartOnClickListenerImpl()) ;
this.stop.setOnClickListener(new StopOnClickListenerImpl()) ;
this.bind = (Button)super.findViewById(R.id.bind);
this.unbind = (Button)super.findViewById(R.id.unbind);
this.bind.setOnClickListener(new BindOnClickListenerImpl());
this.unbind.setOnClickListener(new UnBindOnClickListenerImpl());
}
private class StartOnClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MyServiceDemo.this.startService(new Intent(MyServiceDemo.this,MyServiceUtil.class)) ;
}
}
private class StopOnClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MyServiceDemo.this.stopService(new Intent(MyServiceDemo.this,MyServiceUtil.class)) ;
}
}
private class BindOnClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MyServiceDemo.this.bindService(new Intent(MyServiceDemo.this,
MyServiceUtil.class), MyServiceDemo.this
.serviceConnection, Context.BIND_AUTO_CREATE);
}
}
private class UnBindOnClickListenerImpl implements OnClickListener{
public void onClick(View v) {
MyServiceDemo.this.unbindService(MyServiceDemo.this.serviceConnection);
}
}
}
在MyServiceUtil.java中：
package com.li.service;
import android.app.Service;
import android.content.Intent;
import android.os.Binder;
import android.os.IBinder;
public class MyServiceUtil extends Service {
private IBinder myBinder = new Binder(){
@Override
public String getInterfaceDescriptor() {
return "MyServiceUtil Class";
}
};
@Override
public IBinder onBind(Intent intent) {
System.out.println("*** Service onBind()") ;
return this.myBinder; //
}
@Override
public void onRebind(Intent intent) {
System.out.println("*** Service onRebind()") ;
super.onRebind(intent);
}
@Override
public boolean onUnbind(Intent intent) {
System.out.println("*** Service onUnbind()") ;
return super.onUnbind(intent);
}
@Override
public void onCreate() {
System.out.println("*** Service onCreate()") ;
}
@Override
public void onDestroy() {
System.out.println("*** Service onDestroy()") ;
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
System.out.println("*** Service onStartCommand") ;
return Service.START_CONTINUATION_MASK; // 继续执行
}
}
修改AndroidManifest.xml：
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.li.service"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="8"
android:targetSdkVersion="15" />
<application
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name=".MyServiceDemo"
android:label="@string/title_activity_my_service_demo" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<service android:name=".MyServiceUtil" />
</application>
</manifest>