016_02startService与bindService的比较

　　使用startService()方法启动service，调用者与service之间没有关联，即使调用者退出了，服务仍然运行。

　　使用bindService()方法启动service，调用者与service绑定在一起，调用者一旦退出，服务也就终止。

　　Service使用了onBind 的方法去绑定服务，并返回一个Ibinder对象。具体的Service对象首先需要实现Binder对象，然后利用bindService的方法对Service进行绑定。当Ibinder对象返回具体的Service对象后，才可以获取service方法的内容。

com.example.day16_02servicedemo.MainActivity

1     public void bindservice(View v){
2         Intent  service = new Intent(this, MyService.class);
3         conn =new MyServiceConnection();
4         bindService(service, conn, Context.BIND_AUTO_CREATE);
5     }
 1     class MyServiceConnection implements ServiceConnection{
 2         @Override
 3         public void onServiceConnected(ComponentName name, IBinder service) {
 4             binder =  (MyBinder) service;
 5             System.out.println("MainActivity.MyServiceConnection.onServiceConnected()");
 6         }
 7 
 8         @Override
 9         public void onServiceDisconnected(ComponentName name) {        
10             System.out.println("MainActivity.MyServiceConnection.onServiceDisconnected()");
11         }    
12     }

com.example.day16_02servicedemo.MyService

1     public IBinder onBind(Intent intent) {
2         // TODO Auto-generated method stub
3         System.out.println("MyService.onBind()");
4         //当且仅当此处返回一个非空的Ibinder对象时，bindservice一端的Connection内的onserviceConnected函数才会被系统call到
5         return new MyBinder();        
6     }
1     class MyBinder extends Binder{
2         //内部类里面可以直接调用外部类的方法
3         public String forworadgetruntimeinfo(){            
4             return getruntimeinfo();
5         }    
6     }

1，当点击“启动服务”，Logcat输出：

2，退出该APP后，服务仍然存在；当重新回来点击“停止服务”，Logcat输出：

3，点击“绑定服务”，Logcat输出：

4，点击“解绑服务”或者退出App，Logcat输出：

相关源码如下：

 1 package com.example.day16_02servicedemo;
 2 
 3 import com.example.day16_02servicedemo.MyService.MyBinder;
 4 import android.app.Activity;
 5 import android.content.ComponentName;
 6 import android.content.Context;
 7 import android.content.Intent;
 8 import android.content.ServiceConnection;
 9 import android.os.Bundle;
10 import android.os.IBinder;
11 import android.view.View;
12 
13 public class MainActivity extends Activity {
14     MyServiceConnection conn;
15     MyBinder binder;
16     @Override
17     protected void onCreate(Bundle savedInstanceState) {
18         super.onCreate(savedInstanceState);
19         setContentView(R.layout.activity_main);
20     }
21 
22     public void startservice(View v){
23         Intent  service = new Intent(this, MyService.class);
24         startService(service);    
25     }
26     
27     public void stopservice(View v){    
28         Intent  service = new Intent(this, MyService.class);
29         stopService(service);
30     }
31      
32     public void bindservice(View v){
33         Intent  service = new Intent(this, MyService.class);
34         conn =new MyServiceConnection();
35         bindService(service, conn, Context.BIND_AUTO_CREATE);
36     }
37     
38     public void unbindservice(View v){        
39          unbindService(conn);
40          conn =null;
41     }
42     
43     
44     @Override
45     protected void onDestroy() {
46         // TODO Auto-generated method stub
47         super.onDestroy();
48          if (conn!=null) {
49             unbindService(conn);
50         }     
51     }
52     
53     class MyServiceConnection implements ServiceConnection{
54         @Override
55         public void onServiceConnected(ComponentName name, IBinder service) {
56             binder =  (MyBinder) service;
57             System.out.println("MainActivity.MyServiceConnection.onServiceConnected()");
58         }
59 
60         @Override
61         public void onServiceDisconnected(ComponentName name) {        
62             System.out.println("MainActivity.MyServiceConnection.onServiceDisconnected()");
63         }    
64     }
65 
66     public void callservicefunc(View v){        
67         //调用service内的方法
68         //直接new service对象这种方式不行
69         //需要从service给你传回来的这个内部类着手，解决问题        
70        String info=    binder.forworadgetruntimeinfo();
71        System.out.println("MainActivity.callservicefunc()"+info);     
72     }
73 }
 1 package com.example.day16_02servicedemo;
 2 
 3 import android.app.Service;
 4 import android.content.Intent;
 5 import android.os.Binder;
 6 import android.os.IBinder;
 7  
 8 public class MyService extends Service {
 9     @Override
10     public IBinder onBind(Intent intent) {
11         // TODO Auto-generated method stub
12         System.out.println("MyService.onBind()");
13         //当且仅当此处返回一个非空的Ibinder对象时，bindservice一端的Connection内的onserviceConnected函数才会被系统call到
14         return new MyBinder();        
15     }
16         
17     public String getruntimeinfo(){
18         String info = "momory usage 5%";
19         return info;
20     }
21     
22     @Override
23     public boolean onUnbind(Intent intent) {
24         // TODO Auto-generated method stub
25         System.out.println("MyService.onUnbind()");
26         return super.onUnbind(intent);
27     }
28 
29     @Override
30     public void onRebind(Intent intent) {
31         // TODO Auto-generated method stub
32         super.onRebind(intent);
33         System.out.println("MyService.onRebind()");
34     }
35 
36     @Override
37     public void onCreate() {
38         // TODO Auto-generated method stub
39         super.onCreate();
40         System.out.println("MyService.onCreate()");
41     }
42     
43     @Override
44     public int onStartCommand(Intent intent, int flags, int startId) {
45         // TODO Auto-generated method stub
46         System.out.println("MyService.onStartCommand()");
47         return super.onStartCommand(intent, flags, startId);
48     }
49 
50     @Override
51     public void onDestroy() {
52         // TODO Auto-generated method stub
53         super.onDestroy();
54         System.out.println("MyService.onDestroy()");
55     }
56 
57     class MyBinder extends Binder{
58         //内部类里面可以直接调用外部类的方法
59         public String forworadgetruntimeinfo(){            
60             return getruntimeinfo();
61         }    
62     }
63 }
 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.example.day16_02servicedemo"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6 
 7     <uses-sdk
 8         android:minSdkVersion="14"
 9         android:targetSdkVersion="21" />
10 
11     <application
12         android:allowBackup="true"
13         android:icon="@drawable/ic_launcher"
14         android:label="@string/app_name"
15         android:theme="@style/AppTheme" >
16         <activity
17             android:name=".MainActivity"
18             android:label="@string/app_name" >
19             <intent-filter>
20                 <action android:name="android.intent.action.MAIN" />
21 
22                 <category android:name="android.intent.category.LAUNCHER" />
23             </intent-filter>
24         </activity>
25         <service android:name=".MyService">
26             <intent-filter>
27                 <action android:name="com.cskaoyan.service" />
28          </intent-filter>           
29         </service>
30     </application>
31 
32 </manifest>
 1 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
 2     xmlns:tools="http://schemas.android.com/tools"
 3     android:layout_width="match_parent"
 4     android:layout_height="match_parent"
 5     android:paddingBottom="@dimen/activity_vertical_margin"
 6     android:paddingLeft="@dimen/activity_horizontal_margin"
 7     android:paddingRight="@dimen/activity_horizontal_margin"
 8     android:paddingTop="@dimen/activity_vertical_margin"
 9     tools:context="com.example.day16_04remoteservicedemo.MainActivity" 
10     android:orientation="vertical">
11 
12     <TextView
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:text="@string/hello_world" />
16     <Button
17         android:layout_width="wrap_content"
18         android:layout_height="wrap_content"
19         android:text="启动服务" 
20         android:onClick="startservice"/>
21     <Button
22         android:layout_width="wrap_content"
23         android:layout_height="wrap_content"
24         android:text="停止服务" 
25         android:onClick="stopservice"/>     
26     <Button
27         android:layout_width="wrap_content"
28         android:layout_height="wrap_content"
29         android:text="绑定服务" 
30         android:onClick="bindservice"/>
31     <Button
32         android:layout_width="wrap_content"
33         android:layout_height="wrap_content"
34         android:text="解绑服务" 
35         android:onClick="unbindservice"/>    
36     <Button
37         android:layout_width="wrap_content"
38         android:layout_height="wrap_content"
39         android:text="获取memory usage" 
40         android:onClick="callservicefunc"/>
41 </LinearLayout>
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原文地址：https://www.cnblogs.com/woodrow2015/p/4533663.html