[ 原创 ]新手作品--简单版音乐播放器

为了完成别人交给的小任务，作为一个新手看了很多的视频教程，实在是难死宝宝了，好在终于找到一篇合适我的布局的关于音乐播放器布局的文章，所以用了两天，就照猫画虎的学了下来，为了完全适配我的布局文件，删删减减，查了很多资料....才算是搞出个基本样子，废话不多说，直接上代码和效果图，新人作品，不喜勿喷。

功能很简单：

1.扫描sd卡内的音乐文件，将扫描到的音乐文件加载到音乐列表中。

2.点击音乐列表，实现播放音乐的功能

3.点击播放控制按钮（播放/暂停 上/下一曲）实现相关功能

首先是三个Java文件

package com.example.yangmusicplayer;


import com.example.yangmusicplayer.MusicAdapter;


import android.app.Activity;
import android.media.MediaPlayer;
import android.media.MediaPlayer.OnCompletionListener;
import android.net.Uri;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.Window;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ImageButton;
import android.widget.ListView;

public class MainActivity extends Activity implements OnItemClickListener, OnClickListener {
    
    private ImageButton playmusic,lastmusic,nextmusic;
    
    
    public MusicAdapter mAdapter;
    private ListView mListView;
    public static int mIndex = 0;
    public static MediaPlayer myMediaPlayer;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        requestWindowFeature(Window.FEATURE_NO_TITLE);
      
        setContentView(R.layout.activity_main);
        mListView = (ListView) findViewById(R.id.listview);
        playmusic=(ImageButton) findViewById(R.id.playorpause);
        nextmusic=(ImageButton) findViewById(R.id.next);
        lastmusic=(ImageButton) findViewById(R.id.last);
        mAdapter = new MusicAdapter(this);
        mListView.setAdapter(mAdapter);
        mListView.setOnItemClickListener(this);
        playmusic.setOnClickListener(this);
        nextmusic.setOnClickListener(this);
        lastmusic.setOnClickListener(this);
        
      

       }
    @Override
    public void onClick(View v) {
        switch (v.getId()) {
        case R.id.playorpause:
            playMusic();// 播放歌曲、暂停歌曲
            break;
        case R.id.next:
            playNextMusic();// 播放下一首歌曲
            break;
        case R.id.last:
            playlastMusic();// 播放下一首歌曲
            break;
        default:
            break;
        }
    }
    private void playlastMusic() {
        if (mIndex == mAdapter.musicList.size() - 1) {
            initMp3Source(initMusicUri(0));
        } else {
            initMp3Source(initMusicUri(--mIndex));
        }
        playMusic();
    }
    private void playNextMusic() {
        if (mIndex == mAdapter.musicList.size() - 1) {
            initMp3Source(initMusicUri(0));
        } else {
            initMp3Source(initMusicUri(++mIndex));
        }
        playMusic();
    }
    private void playMusic() {
        if (myMediaPlayer != null) {
            if (myMediaPlayer.isPlaying()) {
                playmusic.setImageResource(R.drawable.play);
                myMediaPlayer.pause();
            } else {
                getMusciInfo();
                playmusic.setImageResource(R.drawable.pause);
                myMediaPlayer.start();
            }

            
        } else {
            initMp3Source(initMusicUri(0));
            playmusic.setImageResource(R.drawable.pause);
            myMediaPlayer.start();
        }

    }
    
    
    private String initMusicUri(int _id) {
        mIndex = _id;
        getMusciInfo();
        return mAdapter.musicList.get(mIndex).getMusicPath();
    }
    
    
    private void getMusciInfo() {
        String songName = mAdapter.musicList.get(mIndex).getMusicName();// 歌曲名称
        String songSinger = mAdapter.musicList.get(mIndex).getMusicSinger();// 歌手名称
    }
    
    
    @Override
    public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) {
        mIndex = arg2;
        String path = mAdapter.musicList.get(arg2).getMusicPath(); // 获得歌曲地址
        getMusciInfo();
        initMp3Source(path);
        playMusic();
    }
    
    
    private void initMp3Source(String path) {
        Uri mp3Uri = Uri.parse(path);
        if (myMediaPlayer != null) {
            myMediaPlayer.stop();
            myMediaPlayer.reset();
            myMediaPlayer = null;
        }
        myMediaPlayer = MediaPlayer.create(this, mp3Uri);
        myMediaPlayer.setOnCompletionListener(new OnCompletionListener() {

            @Override
            public void onCompletion(MediaPlayer mp) {
                playNextMusic();
            }
        });
    }
}
        
        
        
        
        
        
    
    
    

package com.example.yangmusicplayer;

import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;





import java.io.FileNotFoundException;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;



import android.content.ContentResolver;
import android.content.ContentUris;
import android.content.Context;
import android.database.Cursor;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.net.Uri;
import android.provider.MediaStore;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class MusicAdapter extends BaseAdapter {
    // 用来获得ContentProvider(共享数据库)
    public ContentResolver cr;
    // 用来装查询到的音乐文件数据
    public Cursor cur;
    // 歌曲信息列表
    public List<MusicInfo> musicList;
    public Context context;

    public MusicAdapter(Context context) {
        this.context = context;
        // 取得数据库对象
        cr = context.getContentResolver();
        musicList = new ArrayList<MusicInfo>();

        String[] mString = new String[] { MediaStore.Audio.Media.DISPLAY_NAME,
                MediaStore.Audio.Media.ALBUM, MediaStore.Audio.Media.ARTIST,
                MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.SIZE,
                MediaStore.Audio.Media.ALBUM_ID, MediaStore.Audio.Media.DATA };
        // 查询所有音乐信息
        cur = cr.query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, mString,
                null, null, null);

        if (cur != null) {
            // 移动游标到第一个
            cur.moveToFirst();
            int j = 1;
            for (int i = 0; i < cur.getCount(); i++) {
                if (cur.getString(0).endsWith(".mp3")) {// 过滤获取MP3文件
                    MusicInfo mInfo = new MusicInfo();
                    String musicName = cur.getString(0).substring(0,
                            cur.getString(0).lastIndexOf(".mp3"));
                    mInfo.setMusicIndex(j++);
                    mInfo.setMusicName(musicName);
                    mInfo.setMusicAlubm(cur.getString(1));
                    mInfo.setMusicSinger(cur.getString(2));
                    mInfo.setMusicTime(cur.getInt(3));
                    mInfo.setMusicSize(cur.getInt(4));
                    mInfo.setMusicId(cur.getInt(5));
                    mInfo.setMusicPath(cur.getString(6));
                    musicList.add(mInfo);
                }
                cur.moveToNext();
            }

        }
    }

    @Override
    public int getCount() {
        return musicList.size();
    }

    @Override
    public Object getItem(int arg0) {
        return musicList.get(arg0);
    }

    @Override
    public long getItemId(int arg0) {
        return arg0;
    }

    @Override
    public View getView(int arg0, View arg1, ViewGroup arg2) {
        LayoutInflater mlistLayout = LayoutInflater.from(context);
        View mlistView = mlistLayout.inflate(R.layout.musiclist, null);
        TextView songName = (TextView) mlistView.findViewById(R.id.listName);
        TextView singerName = (TextView) mlistView
                .findViewById(R.id.list_Singer);
        ImageView songImage = (ImageView) mlistView
                .findViewById(R.id.listImage);
        int mid = musicList.get(arg0).getMusicIndex();
        String musicName = musicList.get(arg0).getMusicName();
        String musciSinger = musicList.get(arg0).getMusicSinger();
        if (musciSinger.contains("<unknown>")) {
            musciSinger = "<未知>";
        }
        Bitmap img = getAlbumArt(musicList.get(arg0).getMusicId());
        songName.setText(mid + ". " + musicName);
        singerName.setText(musciSinger);
        songImage.setImageBitmap(img);
        return mlistView;
    }

    /**
     * 歌曲专辑图片显示,如果有歌曲图片，才会返回，否则为返回默认的图片
     * 
     * @param albumId
     *            专辑地址
     * @return 返回类型Bitmap
     */
    public Bitmap getAlbumArt(int albumId) {// albumId是音乐专辑的id
        Bitmap bitmap = null;
        Uri sArtworkUri = Uri.parse("content://media/external/audio/albumart");
        Uri albumArtUri = ContentUris.withAppendedId(sArtworkUri, albumId);

        try {
            bitmap = MediaStore.Images.Media.getBitmap(
                    context.getContentResolver(), albumArtUri);
            bitmap = Bitmap.createScaledBitmap(bitmap, 30, 30, true);

        } catch (FileNotFoundException exception) {
            exception.printStackTrace();
            bitmap = BitmapFactory.decodeResource(context.getResources(),
                    R.drawable.album);
        } catch (IOException e) {

            e.printStackTrace();
        }

        return bitmap;
    }
}




    

package com.example.yangmusicplayer;



/**
 * @author YFoliage 歌曲信息类
 */
public class MusicInfo {
    private int musicIndex;  //排序号
    private int musicAlubmId;//专辑ID
    private String musicName;// 歌曲名
    private String musicSinger;// 歌手名
    private int musicTime;// 歌曲时间长度
    private String musicAlubm;// 专辑名称
    private int musicSize;// 曲歌大小
    private String musicPath;// 歌曲路径

    public int getMusicIndex() {
        return musicIndex;
    }

    public void setMusicIndex(int musicIndex) {
        this.musicIndex = musicIndex;
    }

    public int getMusicId() {
        return musicAlubmId;
    }

    public void setMusicId(int musicAlubmId) {
        this.musicAlubmId = musicAlubmId;
    }

    public String getMusicName() {
        return musicName;
    }

    public void setMusicName(String musicName) {
        this.musicName = musicName;
    }

    public String getMusicSinger() {
        return musicSinger;
    }

    public void setMusicSinger(String musicSinger) {
        this.musicSinger = musicSinger;
    }

    public int getMusicTime() {
        return musicTime;
    }

    public void setMusicTime(int musicTime) {
        this.musicTime = musicTime;
    }

    public String getMusicAlubm() {
        return musicAlubm;
    }

    public void setMusicAlubm(String musicAlubm) {
        this.musicAlubm = musicAlubm;
    }

    public int getMusicSize() {
        return musicSize;
    }

    public void setMusicSize(int musicSize) {
        this.musicSize = musicSize;
    }

    public String getMusicPath() {
        return musicPath;
    }

    public void setMusicPath(String musicPath) {
        this.musicPath = musicPath;
    }

}

然后是两个.xml文件

<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:background="@drawable/a4"
    tools:context="com.example.yang" >

    
    
    
    
    
    <ImageButton 
        android:id="@+id/playorpause"
        android:layout_width="55dp"
        android:layout_height="55dp"
        android:layout_alignParentBottom="true"
        android:layout_centerHorizontal="true"
        android:layout_marginBottom="20dp"
         android:src="@drawable/play"/>
  <ImageButton 
        android:id="@+id/next"
        android:layout_width="55dp"
        android:layout_height="55dp"
         android:layout_alignParentBottom="true"
         android:layout_alignParentRight="true"
         android:layout_marginRight="60dp"
        android:layout_marginBottom="20dp"
        android:src="@drawable/next"/>
        
   


     <ImageButton 
        android:id="@+id/last"
        android:layout_width="55dp"
        android:layout_height="55dp"
        android:layout_alignParentBottom="true"
        android:layout_alignParentLeft="true"
        android:layout_marginLeft="60dp"
        android:layout_marginBottom="20dp"
         android:src="@drawable/last"/>
    
    
  
    <TextView
        android:id="@+id/tv1"
        android:layout_width="400dp"
        android:layout_height="60dp"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:textSize="50px" 
        android:textColor="#FFFF99"
        android:gravity="center"
        android:text="我的音乐">
        
        

         
</TextView>

    <ListView
        android:id="@+id/listview"
        android:layout_width="wrap_content"
        android:layout_height="30dp"
        android:layout_above="@+id/playorpause"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/tv1"
        android:divider="#FFFFFF"
        android:dividerHeight="4px" >

    </ListView>

</RelativeLayout>
    

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal" >

    <LinearLayout
        android:layout_width="50sp"
        android:layout_height="50sp"
        android:orientation="vertical" android:gravity="center" >

        <ImageView
            android:id="@+id/listImage"
            android:layout_width="40sp"
            android:layout_height="40sp" />
    </LinearLayout>

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="50sp"
        android:orientation="vertical" >

        <TextView
            android:id="@+id/listName"
            android:layout_width="fill_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center_vertical"
            android:paddingLeft="10dp"
            android:singleLine="true"
            android:textSize="16sp" />

        <TextView
            android:id="@+id/list_Singer"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:layout_weight="1"
            android:gravity="center_vertical"
            android:paddingLeft="10dp"
            android:singleLine="true"
            android:textSize="13sp" />
    </LinearLayout>

</LinearLayout>

展示下效果图：