背景音乐播放器

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Activity_main.xml

</RelativeLayout>

MainActivity.Java

package com.example.musicplayer;

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

public class MainActivity extends Activity implements OnClickListener{

    private Button Btnprev;
    private Button Btnplay;
    private Button Btnstop;
    private Button Btnnext;
    private ComponentName component;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        findView();
        setListener();
    }

    //得到布局中的控件
    private void findView(){
    component=new ComponentName(this,MusicService.class);
    Btnprev=(Button) findViewById(R.id.btnprev);
    Btnplay=(Button) findViewById(R.id.btnplay);
    Btnstop=(Button) findViewById(R.id.btnstop);
    Btnnext=(Button) findViewById(R.id.btnnext);
    }

    //绑定控件事件
    private void setListener(){
    Btnprev.setOnClickListener(this);
    Btnplay.setOnClickListener(this);
    Btnstop.setOnClickListener(this);
    Btnnext.setOnClickListener(this);
    }

    @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;
    }

    //按钮单击事件响应
@Override
public void onClick(View v) {
  //单击上一首时，就在intent中传递上一首歌曲的参数
  if(v==Btnprev){
   Intent intent=new Intent(MusicService.BTNPREV_ACTION);
   intent.setComponent(component);
   startService(intent);
  }else if(v==Btnplay){
   Intent intent=new Intent(MusicService.BTNPLAY_ACTION);
   intent.setComponent(component);
   startService(intent);
  }else if(v==Btnstop){
   Intent intent=new Intent(MusicService.BTNSTOP_ACTION);
   intent.setComponent(component);
   startService(intent);
  }else{
   Intent intent=new Intent(MusicService.BTNNEXT_ACTION);
   intent.setComponent(component);
   startService(intent);
  }

}

}

MusicServices.Java

package com.example.musicplayer;

import java.io.IOException;

import android.app.Service;
import android.content.Intent;
import android.database.Cursor;
import android.media.MediaPlayer;
import android.net.Uri;
import android.os.IBinder;
import android.provider.MediaStore;
import android.widget.Toast;

public class MusicService extends Service{
//定义需要显示的音乐的字段
String[]CursorCols=new String[]{
  "audio._id AS_id",MediaStore.Audio.Media.ARTIST,MediaStore.Audio.Media.ALBUM,
  MediaStore.Audio.Media.TITLE,MediaStore.Audio.Media.DATA,
  MediaStore.Audio.Media.MIME_TYPE,MediaStore.Audio.Media.ALBUM_ID,
  MediaStore.Audio.Media.ARTIST_ID,MediaStore.Audio.Media.DURATION
};
private MediaPlayer mediaPlayer;
private Cursor cursor;
private int PlayPosition=0;

//注册意图
public static final String BTNPLAY_ACTION="com.wyl.music.BTNPLAY_ACTION";
public static final String BTNSTOP_ACTION="com.wyl.music.BTNSTOP_ACTION";
public static final String BTNNEXT_ACTION="com.wyl.music.BTNNEXT_ACTION";
public static final String BTNPREV_ACTION="com.wyl.music.BTNPPREV_ACTION";

@Override
public IBinder onBind(Intent intennt
   ) {
  // TODO Auto-generated method stub
  return null;
}

public void onCreate(){
super.onCreate();
mediaPlayer=new MediaPlayer();
//通过一个URI可以获取所有音频文件
Uri MUSIC_URL=MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
cursor=getContentResolver().query(MUSIC_URL, CursorCols, "duration > 60000", null, null);
}
public void onStart(Intent intent,int startId){
  //根据不同的action，做出不同的响应
  String action=intent.getAction();
//播放
if(action.equals(BTNPLAY_ACTION)){
  play();
    //停止
}else if(action.equals(BTNSTOP_ACTION)){
   stop();
//下一首
}else if(action.equals(BTNNEXT_ACTION)){
    next();
    //上一首
}else if(action.equals(BTNPREV_ACTION)){
  prev();

}
}

private void prev() {
  //得到上一首的歌曲
  if(PlayPosition==0){
   PlayPosition=cursor.getCount()-1;
  }else {
   PlayPosition--;
  }

}

private void next() {
  //得到下一首歌曲
  if(PlayPosition==cursor.getCount()-1){
   PlayPosition=0;
  }else {
   PlayPosition++;
  }

}

private void stop() {
//停止音乐播放
stopSelf();
}

private void play() {
//初始化音乐播放器
inite();
}

private void inite() {
  //充值MediaPlayer
  mediaPlayer.reset();
  //获取歌曲位置
  String dataSource=getDateByPosition(cursor,PlayPosition);
  //歌曲信息
  String info=getInfoByPosition(cursor,PlayPosition);
  Toast.makeText(getApplicationContext(), info, Toast.LENGTH_SHORT).show();
  try{
   //播放器绑定资源
   mediaPlayer.setDataSource(dataSource);
   //播放器准备
   mediaPlayer.prepare();
   //播放
   mediaPlayer.start();
  }catch(IllegalArgumentException el){
   el.printStackTrace();
  }catch(IllegalStateException el){
   el.printStackTrace();
  }catch(IOException el){
   el.printStackTrace();
   }
}
    //获取当前播放歌曲演唱者及歌名
private String getInfoByPosition(Cursor c, int position) {
  c.moveToPosition(position);
  int titleColumn=c.getColumnIndex(MediaStore.Audio.Media.TITLE);
  int artistColumn=c.getColumnIndex(MediaStore.Audio.Media.ARTIST);
  String info=c.getString(artistColumn)+" "+c.getString(titleColumn);
  return info;
}
   //根据位置来获取歌曲位置
private String getDateByPosition(Cursor c, int position) {
  // TODO Auto-generated method stub
  c.moveToPosition(position);
  int dataColumn=c.getColumnIndex(MediaStore.Audio.Media.DATA);
  String data=c.getString(dataColumn);
  return data;
}
public void onDestroy(){
  super.onCreate();
  mediaPlayer.release();
}
}

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