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Service是后台运行，不可见，没有界面的页面，优先级高于Activity，可以用来播放音乐、记录地理信息位置的改变、监听某种动作，类型有两种，一是本地服务，有start和bind两种启动方式，另一种是远程服务。
目标效果：
程序运行显示所有的按钮控件，分为两类，上边是start的启动和停止，下边是bind的启动和停止，点击输出对应的生命周期的方法内容。
1.activity_main.xml页面放置所有按钮控件。
activity_main.xml页面：
<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"
tools:context=".MainActivity" >
<TextView
android:id="@+id/tvStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentTop="true"
android:text="Start:" />
<Button
android:id="@+id/btStart"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/tvStart"
android:text="StartService" />
<Button
android:id="@+id/btStop"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/btStart"
android:text="StopService" />
<TextView
android:id="@+id/tvBind"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_below="@+id/btStop"
android:text="Bind:" />
<Button
android:id="@+id/btBind"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/tvBind"
android:text="BindService" />
<LinearLayout
android:id="@+id/changeOne"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/btBind"
android:orientation="horizontal" >
<Button
android:id="@+id/btPrevious"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_weight="1"
android:text="上一首" />
<Button
android:id="@+id/btNext"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_weight="1"
android:text="下一首" />
</LinearLayout>
<LinearLayout
android:id="@+id/changeTwo"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/changeOne"
android:orientation="horizontal" >
<Button
android:id="@+id/btPlay"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_weight="1"
android:text="播放" />
<Button
android:id="@+id/btPause"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_weight="1"
android:text="暂停" />
</LinearLayout>
<Button
android:id="@+id/btUnBind"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_below="@+id/changeTwo"
android:text="UnBindService" />
</RelativeLayout>
package com.example.service;
import android.app.Service;
import android.content.Intent;
import android.os.IBinder;
import android.util.Log;
public class myStartService extends Service{
@Override
public IBinder onBind(Intent arg0) {
Log.i("MainActivity","startService--onBind()");
return null;
}
@Override
public void onCreate() {
Log.i("MainActivity","startService--onCeate()");
super.onCreate();
}
@Override
public int onStartCommand(Intent intent, int flags, int startId) {
Log.i("MainActivity","startService--onStartCommand()");
return super.onStartCommand(intent, flags, startId);
}
@Override
public void onDestroy() {
super.onDestroy();
Log.i("MainActivity","startService--onDestroy()");
}
}
package com.example.service;
import android.app.Service;
import android.content.Intent;
import android.content.ServiceConnection;
import android.os.Binder;
import android.os.IBinder;
import android.util.Log;
public class myBindService extends Service{
/*定义类继承Binder返回服务对象*/
public class MyBinder extends Binder{
public myBindService getService(){
return myBindService.this;
}
}
@Override
public IBinder onBind(Intent arg0) {
Log.i("MainActivity","bindService--onBind()");
return new MyBinder();//实例服务对象并返回
}
@Override
public void onCreate() {
super.onCreate();
Log.i("MainActivity","bindService--onCeate()");
}
@Override
public void unbindService(ServiceConnection conn) {
super.unbindService(conn);
Log.i("MainActivity","bindService--unbindService()");
}
@Override
public void onDestroy() {
super.onDestroy();
Log.i("MainActivity","bindService--onDestroy()");
}
public void play(){
Log.i("MainActivity","播放");
}
public void pause(){
Log.i("MainActivity","暂停");
}
public void previous(){
Log.i("MainActivity","上一首");
}
public void next(){
Log.i("MainActivity","下一首");
}
}
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.service"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="17"
android:targetSdkVersion="19" />
<application
android:allowBackup="true"
android:icon="@drawable/ic_launcher"
android:label="@string/app_name"
android:theme="@style/AppTheme" >
<activity
android:name="com.example.service.MainActivity"
android:label="@string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<!-- 注册Service -->
<service android:name="com.example.service.myStartService"></service>
<service android:name="com.example.service.myBindService"></service>
</application>
</manifest>
package com.example.service;
import com.example.service.myBindService.MyBinder;
import android.os.Bundle;
import android.os.IBinder;
import android.app.Activity;
import android.app.Service;
import android.content.ComponentName;
import android.content.Intent;
import android.content.ServiceConnection;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
public class MainActivity extends Activity implements OnClickListener {
private Button btStart, btStop, btBind, btPrevious, btNext, btPlay,
btPause, btUnBind;
private Intent intentStart,intentBind;
private myBindService service;
/*得到服务对象*/
private ServiceConnection conn=new ServiceConnection() {
/*当启动源跟Service的连接意外丢失的时候会调用这个方法，比如当Service崩溃了或者被强行杀死了*/
@Override
public void onServiceDisconnected(ComponentName arg0) {
}
/*当启动源跟Service成功连接之后将会自动调用这个方法*/
@Override
public void onServiceConnected(ComponentName name, IBinder binder) {
service=((MyBinder)binder).getService();//得到服务对象
}
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
getId();
bindClick();
}
private void getId() {
btStart = (Button) findViewById(R.id.btStart);
btStop = (Button) findViewById(R.id.btStop);
btBind = (Button) findViewById(R.id.btBind);
btPrevious = (Button) findViewById(R.id.btPrevious);
btNext = (Button) findViewById(R.id.btNext);
btPlay = (Button) findViewById(R.id.btPlay);
btPause = (Button) findViewById(R.id.btPause);
btUnBind = (Button) findViewById(R.id.btUnBind);
}
private void bindClick() {
btStart.setOnClickListener(this);
btStop.setOnClickListener(this);
btBind.setOnClickListener(this);
btPrevious.setOnClickListener(this);
btNext.setOnClickListener(this);
btPlay.setOnClickListener(this);
btPause.setOnClickListener(this);
btUnBind.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.btStart:
intentStart=new Intent(MainActivity.this,myStartService.class);
startService(intentStart);
break;
case R.id.btStop:
stopService(intentStart);
break;
case R.id.btPlay:
service.play();
break;
case R.id.btPause:
service.pause();
break;
case R.id.btPrevious:
service.previous();
break;
case R.id.btNext:
service.next();
break;
case R.id.btBind://绑定
intentBind=new Intent(MainActivity.this,myBindService.class);
//第一个参数为实例的intent对象，第二个参数为得到的服务对象
bindService(intentBind, conn,Service.BIND_AUTO_CREATE);
break;
case R.id.btUnBind://解绑，只可点击一次，并且如果想要结束启动源，必须解绑
unbindService(conn);
break;
}
}
}
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原文地址：http://blog.csdn.net/hester_hester/article/details/51345651
