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

 <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="com.service2.MainActivity" >

     <Button
         android:id="@+id/bindBtn"
         android:layout_width="wrap_content"
         android:layout_height="wrap_content"
         android:text="完成绑定操作" />

 </RelativeLayout>

(2)AndroidManifest.xml

 <?xml version="1.0" encoding="utf-8"?>
 <manifest xmlns:android="http://schemas.android.com/apk/res/android"
     package="com.service2"
     android:versionCode="1"
     android:versionName="1.0" >

     <uses-sdk
         android:minSdkVersion="8"
         android:targetSdkVersion="21" />

     <application
         android:allowBackup="true"
         android:icon="@drawable/ic_launcher"
         android:label="@string/app_name"
         android:theme="@style/AppTheme" >
         <activity
             android:name=".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>
         <service android:name=".SecondService"></service>
     </application>

 </manifest>

2.java
(1)MainActivity.java

 package com.service2;

 import android.app.Activity;
 import android.content.ComponentName;
 import android.content.Intent;
 import android.content.ServiceConnection;
 import android.os.Bundle;
 import android.os.IBinder;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;

 import com.service2.SecondService.FirstBinder;

 public class MainActivity extends Activity {

     private Button bindBtn = null;
     @Override
     protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
         setContentView(R.layout.activity_main);
         bindBtn = (Button)findViewById(R.id.bindBtn);
         bindBtn.setOnClickListener(new OnClickListener() {
             @Override
             public void onClick(View v) {
                 Intent intent = new Intent();
                 intent.setClass(MainActivity.this, SecondService.class);
                 bindService(intent, conn, BIND_AUTO_CREATE);
             }
         });
     }

     ServiceConnection conn = new ServiceConnection() {
         @Override
         public void onServiceDisconnected(ComponentName name) {
             System.out.println("onServiceDisconnected>>>>>>");
         }
         @Override
         public void onServiceConnected(ComponentName name, IBinder service) {
             FirstBinder binder = (FirstBinder)service;
             System.out.println("onServiceConnected>>>>>"+binder.getData());
         }
     };
 }

(2)SecondService.java

 package com.service2;

 import android.app.Service;
 import android.content.Intent;
 import android.os.Binder;
 import android.os.IBinder;

 public class SecondService extends Service {

     @Override
     public IBinder onBind(Intent intent) {
         IBinder binder = new FirstBinder();
         return binder;
     }

     class FirstBinder extends Binder {
         public String getData() {
             return "test data";
         }
     }
 }