ANDROID_MARS学习笔记_S01原始版_017

ANDROID_MARS学习笔记_S01原始版_017_绑定SERVICE

一、流程

1.编写service,重写onBind(Intent intent)，返回自定义的Binder

2.自写义Binder，提供一个可访问的方法，以传递数据

3.点击界面按钮会开启service,过程为,通过Intent的setClass指定要开启的service，再通过bindService(intent, conn, BIND_AUTO_CREATE);开启service,其中参数conn是ServiceConnection，需要实现它的onServiceConnected(ComponentName name, IBinder service)，service开启成功后，会回调这个函数，会把binder传给参数IBinder,从而实现数据传递，这就是所谓的给service提供了client-server模式

二、代码
1.xml
(1)activity_main.xml

 1 <RelativeLayout 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.service2.MainActivity" >
10 
11     <Button
12         android:id="@+id/bindBtn"
13         android:layout_width="wrap_content"
14         android:layout_height="wrap_content"
15         android:text="完成绑定操作" />
16 
17 </RelativeLayout>

(2)AndroidManifest.xml

 1 <?xml version="1.0" encoding="utf-8"?>
 2 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
 3     package="com.service2"
 4     android:versionCode="1"
 5     android:versionName="1.0" >
 6 
 7     <uses-sdk
 8         android:minSdkVersion="8"
 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=".SecondService"></service>
26     </application>
27 
28 </manifest>

2.java
(1)MainActivity.java

 1 package com.service2;
 2 
 3 import android.app.Activity;
 4 import android.content.ComponentName;
 5 import android.content.Intent;
 6 import android.content.ServiceConnection;
 7 import android.os.Bundle;
 8 import android.os.IBinder;
 9 import android.view.View;
10 import android.view.View.OnClickListener;
11 import android.widget.Button;
12 
13 import com.service2.SecondService.FirstBinder;
14 
15 public class MainActivity extends Activity {
16 
17     private Button bindBtn = null;
18     @Override
19     protected void onCreate(Bundle savedInstanceState) {
20         super.onCreate(savedInstanceState);
21         setContentView(R.layout.activity_main);
22         bindBtn = (Button)findViewById(R.id.bindBtn);
23         bindBtn.setOnClickListener(new OnClickListener() {
24             @Override
25             public void onClick(View v) {
26                 Intent intent = new Intent();
27                 intent.setClass(MainActivity.this, SecondService.class);
28                 bindService(intent, conn, BIND_AUTO_CREATE);
29             }
30         });
31     }
32     
33     ServiceConnection conn = new ServiceConnection() {
34         @Override
35         public void onServiceDisconnected(ComponentName name) {
36             System.out.println("onServiceDisconnected>>>>>>");
37         }
38         @Override
39         public void onServiceConnected(ComponentName name, IBinder service) {
40             FirstBinder binder = (FirstBinder)service;
41             System.out.println("onServiceConnected>>>>>"+binder.getData());
42         }
43     };
44 }

(2)SecondService.java

 1 package com.service2;
 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 SecondService extends Service {
 9 
10     @Override
11     public IBinder onBind(Intent intent) {
12         IBinder binder = new FirstBinder();
13         return binder;
14     }
15 
16     class FirstBinder extends Binder {
17         public String getData() {
18             return "test data";
19         }
20     }
21 }