利用Service后台播放音乐实例

AndroidManifest.xml     //在这个文件中建立service标签

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    package="com.example.ok2"
    android:versionCode="1"
    android:versionName="1.0" >

    <uses-sdk
        android:minSdkVersion="8"
        android:targetSdkVersion="18" />

    <application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppTheme" >
        <activity
            android:name="com.example.ok2.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="com.example.ok2.wudi" android:exported="false">  //建立service标签名称是wudi 这个地方的名称就是 com.example.ok2中的程序.java文件名称
            <intent-filter>
                <action android:name=".player2"></action>  //建立动作名称  在程序中运行名字叫".player2"的intent 就可以调用上面的.java文件
            </intent-filter>
           
        </service>
    </application>

</manifest>

 

MainActivity.java 文件

package com.example.ok2;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.widget.Button;
import android.view.View;
import android.view.View.OnClickListener;
import android.content.Intent;

public class MainActivity extends Activity {

 private Intent intent=new Intent(".player2");  //获取AndroidManifest.xml    中的action定义的名称
 @Override
 protected void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_main);
  findview();              //运行下面 获取button1和button2
  viewHolder.button1.setOnClickListener(new OnClickListener(){     //设置button1在服务中播放音乐
   
   public void onClick(View v)
   {
    startService(intent);
   }
  });
  
  viewHolder.button2.setOnClickListener(new OnClickListener(){    //设置button2在服务停止音乐
   
   public void onClick(View v)
   {
    stopService(intent);
   }
  });
 }

 private void findview() {
  viewHolder.button1=(Button)findViewById(R.id.button1);
  viewHolder.button2=(Button)findViewById(R.id.button2);
  
 }

 @Override
 public boolean onCreateOptionsMenu(Menu menu) {
  // Inflate the menu; this adds items to the action bar if it is present.
  getMenuInflater().inflate(R.menu.main, menu);
  return true;
 }

}

 

wudi.java

package com.example.ok2;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.os.IBinder;

public class wudi extends Service {

 private MediaPlayer player;
 public IBinder onBind(Intent intent) {
  // TODO Auto-generated method stub
  return null;
 }

 public void onStart(Intent intent, int startId) {      //startService(intent);运行onStart()
  // TODO Auto-generated method stub
  super.onStart(intent, startId);
 if(player==null)
 {
  player=MediaPlayer.create(this, R.raw.start22);    //在res下建立raw文件夹，然后把音乐放到这里面；系统会自动在gen/J.java里面建立raw对立的音乐名称
  player.start();
 }
 }
 
 @Override
 public void onDestroy() {                                    //stopService(intent);  //运行onDestroy();
  // TODO Auto-generated method stub
  super.onDestroy();
  player.stop();
 }
}

 

viewHolder.java

package com.example.ok2;
import android.widget.Button;

public class viewHolder {                     //声明button1和button2
 public static Button button1;
 public static Button button2;
}

 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=".MainActivity" >

    <Button
        android:id="@+id/button1"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/value_button1"
        />
    <Button
        android:id="@+id/button2"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:text="@string/value_button2"
        android:layout_below="@+id/button1"
        />

</RelativeLayout>