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";
        }
    }
}