Android播放音乐案例分享

//媒体播放器
private MediaPlayer player;

public void onCreate() {
  File file=new File(Environment.getExternalStorageDirectory(),"a.mp3");
  player =new MediaPlayer();
  try {
   //设置播放源
   player.setDataSource(file.getAbsolutePath());
  } catch (Exception e) {
   e.printStackTrace();
  } 
  Log.d("fanfan", "onCreate");
  super.onCreate();
 }

public int onStartCommand(Intent intent, int flags, int startId) {
  
  try {
   //设置准备资源监听器，当资源准备完毕，回调监听器的onPrepared函数
   player.setOnPreparedListener(new OnPreparedListener() {
    @Override
    //准备资源准备好了会调用这个
    public void onPrepared(MediaPlayer arg0) {
     //播放音乐
     player.start();
    }
   });
   
   //准备资源，好来播放音乐
   //异步函数，这个函数内部会开启一个子线程
   player.prepareAsync();
   
  } catch (Exception e) {
   e.printStackTrace();
  } 
  
  Log.d("fanfan", "onStartCommand");
  return super.onStartCommand(intent, flags, startId);
 }

public void onDestroy() {
    //结束音乐
    player.stop();
    //释放资源，如果播放下一首的话，就用不着释放资源
    player.release();
    Log.d("fanfan", "onDestroy");
    super.onDestroy();
  }

package fry;

import java.io.File;
import java.io.IOException;

import android.app.Service;
import android.content.Intent;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnPreparedListener;
import android.os.Environment;
import android.os.IBinder;
import android.util.Log;

public class myService extends Service{

  //媒体播放器
  private MediaPlayer player;
  /**
   * 当绑定这个服务的时候调用
   */
  @Override
  public IBinder onBind(Intent arg0) {
    Log.d("fanfan", "onBind");
    return null;
  }
  /**
   * service被创建后调用
   */
  @Override
  public void onCreate() {
    File file=new File(Environment.getExternalStorageDirectory(),"a.mp3");
    player =new MediaPlayer();
    try {
      //设置播放源
      player.setDataSource(file.getAbsolutePath());
    } catch (Exception e) {
      e.printStackTrace();
    } 
    Log.d("fanfan", "onCreate");
    super.onCreate();
  }
  
  /**
   * service被start后调用
   */
  @Override
  public int onStartCommand(Intent intent, int flags, int startId) {
    
    try {
      //设置准备资源监听器，当资源准备完毕，回调监听器的onPrepared函数
      player.setOnPreparedListener(new OnPreparedListener() {
        @Override
        //准备资源准备好了会调用这个
        public void onPrepared(MediaPlayer arg0) {
          //播放音乐
          player.start();
        }
      });
      
      //准备资源，好来播放音乐
      //异步函数，这个函数内部会开启一个子线程
      player.prepareAsync();
      
    } catch (Exception e) {
      e.printStackTrace();
    } 
    
    Log.d("fanfan", "onStartCommand");
    return super.onStartCommand(intent, flags, startId);
  }
  
  /**
   * service被停止后调用
   */
  @Override
  public void onDestroy() {
    //结束音乐
    player.stop();
    //释放资源，如果播放下一首的话，就用不着释放资源
    player.release();
    Log.d("fanfan", "onDestroy");
    super.onDestroy();
  }

}

<manifest xmlns:android="http://schemas.android.com/apk/res/android"
  package="com.example.playMusic"
  android:versionCode="1"
  android:versionName="1.0" >

  <uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="19" />

  <application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
      android:name="fry.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>
    <activity android:name="fry.Activity01" android:exported="true"></activity>
    
    <service android:name="fry.myService">
      
    </service>
    
  </application>

</manifest>

package fry;

import com.example.playMusic.R;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;

public class Activity01 extends Activity{
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    // TODO Auto-generated method stub
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity01);
  }
  
  public void onClick(View view){
    Intent intent=new Intent();
    intent.setClass(this, myService.class);
    switch(view.getId()){
    case R.id.btn_start://播放音乐，启动服务
      startService(intent);
      break;
    case R.id.btn_stop://结束音乐，停止服务
      stopService(intent);
      break;
    }
  }
}