android获取手机和sd卡上音乐列表

歌曲列表是来显示SD卡或手机内存中的歌曲，因为android会自动扫描媒体对象，直接使用MediaStore就可以显示歌曲名称、艺术家、缩略图等。再次使用ListView来显示这些信息，xml布局很简单就是一个ListView：

 

1. 歌曲ID：MediaStore.Audio.Media._ID  
2. Int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID));   
3.    
4. 歌曲的名称 ：MediaStore.Audio.Media.TITLE  
5. String tilte = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));   
6.    
7. 歌曲的专辑名：MediaStore.Audio.Media.ALBUM  
8. String album = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM));   
9.    
10.    
11. 歌曲的歌手名： MediaStore.Audio.Media.ARTIST  
12. String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));   
13.    
14. 歌曲文件的路径 ：MediaStore.Audio.Media.DATA  
15. String url = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));   
16.    
17. 歌曲的总播放时长 ：MediaStore.Audio.Media.DURATION  
18. Int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));   
19.    
20. 歌曲文件的大小 ：MediaStore.Audio.Media.SIZE  
21. Int size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE));   

 

[html] 

<SPAN style="FONT-SIZE: 14px"><?xml version="1.0" encoding="utf-8"?>  

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"  

    android:layout_width="fill_parent"  

    android:layout_height="fill_parent"  

    android:orientation="vertical" >  

  

    <ListView  

        android:id="@+id/music_list"  

        android:layout_width="fill_parent"  

        android:layout_height="fill_parent"  

        android:background="@drawable/listbg"  

        android:cacheColorHint="#00000000" >  

    </ListView>  

  

</LinearLayout></SPAN><PRE class=java name="code"><SPAN style="FONT-SIZE: 14px">  

</SPAN></PRE>  

 

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:layout_width="fill_parent"

    android:layout_height="fill_parent"

    android:orientation="vertical" >

 

    <ListView

        android:id="@+id/music_list"

        android:layout_width="fill_parent"

        android:layout_height="fill_parent"

        android:background="@drawable/listbg"

        android:cacheColorHint="#00000000" >

    </ListView>

 

</LinearLayout>[java] view plaincopyprint?<SPAN style="FONT-SIZE: 14px">  </SPAN>  

  既然使用ListView来显示歌曲信息，例如歌曲标题、歌手、缩略图以及时长等等。那么如何获取这些信息以及如何显示到ListView中呢？要分为两个步骤：

 

  (1)使用MediaStore获取歌曲信息

 

  (2)自定义Adapter将MediaStore获取歌曲信息显示出来

 

  

 

[html]

/**  

 *   

 */  

package com.android.musicplayer.activity;  

  

import java.io.File;  

import com.android.musicplayer.adapter.MusicListAdapter;  

import com.android.musicplayer.util.ScanSdReceiver;  

import android.app.Activity;  

import android.app.AlertDialog;  

import android.content.BroadcastReceiver;  

import android.content.Context;  

import android.content.DialogInterface;  

import android.content.Intent;  

import android.content.IntentFilter;  

import android.database.Cursor;  

import android.media.AudioManager;  

import android.os.Bundle;  

import android.provider.MediaStore;  

import android.view.ContextMenu;  

import android.view.KeyEvent;  

import android.view.Menu;  

import android.view.MenuItem;  

import android.view.View;  

import android.view.ContextMenu.ContextMenuInfo;  

import android.view.View.OnCreateContextMenuListener;  

import android.widget.AdapterView;  

import android.widget.ListView;  

import android.widget.AdapterView.OnItemClickListener;  

  

/**  

 * @author Administrator  

 *   

 */  

public class SongsActivity extends Activity {  

  

    private int[] _ids;// 保存音乐ID临时数组  

    private String[] _artists;// 保存艺术家  

    private String[] _titles;// 标题临时数组  

    private ListView listView;// 列表对象  

    private Cursor cursor;  

    private MusicListAdapter musicListAdapter;  

    private AlertDialog ad = null;  

    private AlertDialog.Builder builder = null;  

    private static final String MUSIC_LIST = "com.android.musicplayer.activity.list";  

    /**  

     * 定义查找音乐信息数组，1.标题 2.音乐时间 3.艺术家 4.音乐id 5.显示名字 6.数据  

     */  

    String[] media_music_info = new String[] { MediaStore.Audio.Media.TITLE,  

            MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.ARTIST,  

            MediaStore.Audio.Media._ID, MediaStore.Audio.Media.DISPLAY_NAME,  

            MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.ALBUM_ID };  

  

    @Override  

    protected void onCreate(Bundle savedInstanceState) {  

        super.onCreate(savedInstanceState);  

        setContentView(R.layout.activity_songs);  

        listView = (ListView) findViewById(R.id.music_list);  

        listView.setOnItemClickListener(new MusicListOnClickListener());// 创建一个ListView监听器对象  

        showMusicList();  

    }  

  

    private void showMusicList() {  

        cursor = getContentResolver().query(  

                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, media_music_info,  

                null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);  

        cursor.moveToFirst();// 将游标移动到初始位置  

        _ids = new int[cursor.getCount()];// 返回int的一个列  

        _artists = new String[cursor.getCount()];// 返回String的一个列  

        _titles = new String[cursor.getCount()];// 返回String的一个列  

        for (int i = 0; i < cursor.getCount(); i++) {  

            _ids[i] = cursor.getInt(3);  

            _titles[i] = cursor.getString(0);  

            _artists[i] = cursor.getString(2);  

            cursor.moveToNext();// 将游标移到下一行  

        }  

        musicListAdapter = new MusicListAdapter(this, cursor);  

        listView.setAdapter(musicListAdapter);// 用setAdapter装载数据  

        listView.setOnCreateContextMenuListener(new ContextMenuListener());  

    }  

  

      

    public boolean onKeyDown(int keyCode, KeyEvent event) {  

        if (keyCode == KeyEvent.KEYCODE_BACK) {  

            if (scanSdReceiver != null)  

                unregisterReceiver(scanSdReceiver);  

            Intent intent = new Intent();  

            intent.setClass(this, MainActivity.class);  

            startActivity(intent);  

            finish();  

        }  

        return true;  

    }  

  

}  

 

/**

 * 

 */

package com.android.musicplayer.activity;

 

import java.io.File;

import com.android.musicplayer.adapter.MusicListAdapter;

import com.android.musicplayer.util.ScanSdReceiver;

import android.app.Activity;

import android.app.AlertDialog;

import android.content.BroadcastReceiver;

import android.content.Context;

import android.content.DialogInterface;

import android.content.Intent;

import android.content.IntentFilter;

import android.database.Cursor;

import android.media.AudioManager;

import android.os.Bundle;

import android.provider.MediaStore;

import android.view.ContextMenu;

import android.view.KeyEvent;

import android.view.Menu;

import android.view.MenuItem;

import android.view.View;

import android.view.ContextMenu.ContextMenuInfo;

import android.view.View.OnCreateContextMenuListener;

import android.widget.AdapterView;

import android.widget.ListView;

import android.widget.AdapterView.OnItemClickListener;

 

/**

 * @author Administrator

 * 

 */

public class SongsActivity extends Activity {

 

private int[] _ids;// 保存音乐ID临时数组

private String[] _artists;// 保存艺术家

private String[] _titles;// 标题临时数组

private ListView listView;// 列表对象

private Cursor cursor;

private MusicListAdapter musicListAdapter;

private AlertDialog ad = null;

private AlertDialog.Builder builder = null;

private static final String MUSIC_LIST = "com.android.musicplayer.activity.list";

/**

* 定义查找音乐信息数组，1.标题 2.音乐时间 3.艺术家 4.音乐id 5.显示名字 6.数据

*/

String[] media_music_info = new String[] { MediaStore.Audio.Media.TITLE,

MediaStore.Audio.Media.DURATION, MediaStore.Audio.Media.ARTIST,

MediaStore.Audio.Media._ID, MediaStore.Audio.Media.DISPLAY_NAME,

MediaStore.Audio.Media.DATA, MediaStore.Audio.Media.ALBUM_ID };

 

@Override

protected void onCreate(Bundle savedInstanceState) {

super.onCreate(savedInstanceState);

setContentView(R.layout.activity_songs);

listView = (ListView) findViewById(R.id.music_list);

listView.setOnItemClickListener(new MusicListOnClickListener());// 创建一个ListView监听器对象

showMusicList();

}

 

private void showMusicList() {

cursor = getContentResolver().query(

MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, media_music_info,

null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);

cursor.moveToFirst();// 将游标移动到初始位置

_ids = new int[cursor.getCount()];// 返回int的一个列

_artists = new String[cursor.getCount()];// 返回String的一个列

_titles = new String[cursor.getCount()];// 返回String的一个列

for (int i = 0; i < cursor.getCount(); i++) {

_ids[i] = cursor.getInt(3);

_titles[i] = cursor.getString(0);

_artists[i] = cursor.getString(2);

cursor.moveToNext();// 将游标移到下一行

}

musicListAdapter = new MusicListAdapter(this, cursor);

listView.setAdapter(musicListAdapter);// 用setAdapter装载数据

listView.setOnCreateContextMenuListener(new ContextMenuListener());

}

 

 

public boolean onKeyDown(int keyCode, KeyEvent event) {

if (keyCode == KeyEvent.KEYCODE_BACK) {

if (scanSdReceiver != null)

unregisterReceiver(scanSdReceiver);

Intent intent = new Intent();

intent.setClass(this, MainActivity.class);

startActivity(intent);

finish();

}

return true;

}

 

}

 

 

 

 

  同样的使用自定义Adapter来显示歌曲：MusicListAdapter，这里有一点要说明的是，获取歌曲内置的图片比较麻烦一些。

 

 

 

[java] 

<SPAN style="FONT-SIZE: 14px">/** 

 *  

 */  

package com.android.musicplayer.adapter;  

  

import java.io.FileDescriptor;  

import java.io.FileNotFoundException;  

import java.io.IOException;  

import java.io.InputStream;  

import com.android.musicplayer.activity.R;  

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.os.ParcelFileDescriptor;  

import android.provider.MediaStore;  

import android.util.Log;  

import android.view.LayoutInflater;  

import android.view.View;  

import android.view.ViewGroup;  

import android.widget.BaseAdapter;  

import android.widget.ImageView;  

import android.widget.TextView;  

  

/** 

 * @author Administrator 

 *  

 */  

public class MusicListAdapter extends BaseAdapter {  

  

    private Context myContext;  

    private Cursor myCursor;  

    private int pos = -1;  

  

    public MusicListAdapter(Context context, Cursor cursor) {  

        myContext = context;  

        myCursor = cursor;  

    }  

  

    @Override  

    public int getCount() {  

        return myCursor.getCount();  

    }  

  

    @Override  

    public Object getItem(int position) {  

        return position;  

    }  

  

    @Override  

    public long getItemId(int position) {  

        return position;  

    }  

  

    @Override  

    public View getView(int position, View convertView, ViewGroup parent) {  

        ViewHolder holder = null;  

        View vi = convertView;  

        if (convertView == null) {  

            holder = new ViewHolder();  

            vi = LayoutInflater.from(myContext).inflate(R.layout.musiclist,  

                    null);  

            holder.tv_music = (TextView) vi.findViewById(R.id.music1);  

            holder.tv_singer = (TextView) vi.findViewById(R.id.singer);  

            holder.tv_time = (TextView) vi.findViewById(R.id.time);  

            holder.img = (ImageView) vi.findViewById(R.id.listitem);  

            vi.setTag(holder);  

        } else {  

            holder = (ViewHolder) convertView.getTag();  

        }  

        myCursor.moveToPosition(position);  

        if (myCursor.getString(0).length() > 15) {  

            try {  

                String musicTitle = myCursor.getString(0).trim()  

                        .substring(0, 12)  

                        + "...";  

                holder.tv_music.setText(musicTitle);  

            } catch (Exception e) {  

  

                e.printStackTrace();  

            }  

        } else {  

            holder.tv_music.setText(myCursor.getString(0).trim());  

        }  

        if (myCursor.getString(2).equals("<unknown>")) {  

            holder.tv_singer.setText("未知艺术家?");  

        } else {  

            holder.tv_singer.setText(myCursor.getString(2));  

        }  

        if (position == pos) {  

            holder.img.setImageResource(R.drawable.isplaying);  

        } else {  

            // img.setImageResource(R.drawable.item);   

            Bitmap bm = getArtwork(myContext, myCursor.getInt(3),  

                    myCursor.getInt(myCursor  

                            .getColumnIndex(MediaStore.Audio.Media.ALBUM_ID)),  

                    true);  

            holder.img.setImageBitmap(bm);  

        }  

        return vi;  

    }  

  

    public void setItemIcon(int position) {  

        pos = position;  

    }  

  

    public String toTime(int time) {  

  

        time /= 1000;  

        int minute = time / 60;  

        int hour = minute / 60;  

        int second = time % 60;  

        minute %= 60;  

        return String.format("%02d:%02d", minute, second);  

    }  

  

    public static Bitmap getArtwork(Context context, long song_id,  

            long album_id, boolean allowdefault) {  

        Log.v("ADW", "getArtwork");  

        if (album_id < 0) {  

            // This is something that is not in the database, so get the album   

            // art directly   

            // from the file.   

            if (song_id >= 0) {  

                Bitmap bm = getArtworkFromFile(context, song_id, -1);  

                if (bm != null) {  

                    return bm;  

                }  

            }  

            if (allowdefault) {  

                return getDefaultArtwork(context);  

            }  

            return null;  

        }  

        ContentResolver res = context.getContentResolver();  

        Uri uri = ContentUris.withAppendedId(sArtworkUri, album_id);  

        if (uri != null) {  

            InputStream in = null;  

            try {  

                in = res.openInputStream(uri);  

                BitmapFactory.Options options = new BitmapFactory.Options();  

                options.inSampleSize = 1;  

                options.inJustDecodeBounds = true;  

                BitmapFactory.decodeStream(in, null, options);  

                options.inSampleSize = computeSampleSize(options, 30);  

                options.inJustDecodeBounds = false;  

                options.inDither = false;  

                options.inPreferredConfig = Bitmap.Config.ARGB_8888;  

                in = res.openInputStream(uri);  

                return BitmapFactory.decodeStream(in, null, options);  

            } catch (FileNotFoundException ex) {  

                // The album art thumbnail does not actually exist. Maybe the   

                // user deleted it, or   

                // maybe it never existed to begin with.   

                Bitmap bm = getArtworkFromFile(context, song_id, album_id);  

                if (bm != null) {  

                    if (bm.getConfig() == null) {  

                        bm = bm.copy(Bitmap.Config.RGB_565, false);  

                        if (bm == null && allowdefault) {  

                            return getDefaultArtwork(context);  

                        }  

                    }  

                } else if (allowdefault) {  

                    bm = getDefaultArtwork(context);  

                }  

                return bm;  

            } finally {  

                try {  

                    if (in != null) {  

                        in.close();  

                    }  

                } catch (IOException ex) {  

                }  

            }  

        }  

  

        return null;  

    }  

  

    private static Bitmap getArtworkFromFile(Context context, long songid,  

            long albumid) {  

        Bitmap bm = null;  

        byte[] art = null;  

        String path = null;  

        if (albumid < 0 && songid < 0) {  

            throw new IllegalArgumentException(  

                    "Must specify an album or a song id");  

        }  

        try {  

  

            BitmapFactory.Options options = new BitmapFactory.Options();  

  

            FileDescriptor fd = null;  

            if (albumid < 0) {  

                Uri uri = Uri.parse("content://media/external/audio/media/"  

                        + songid + "/albumart");  

                ParcelFileDescriptor pfd = context.getContentResolver()  

                        .openFileDescriptor(uri, "r");  

                if (pfd != null) {  

                    fd = pfd.getFileDescriptor();  

                    // bm = BitmapFactory.decodeFileDescriptor(fd,null,options);   

                }  

            } else {  

                Uri uri = ContentUris.withAppendedId(sArtworkUri, albumid);  

                ParcelFileDescriptor pfd = context.getContentResolver()  

                        .openFileDescriptor(uri, "r");  

                if (pfd != null) {  

                    fd = pfd.getFileDescriptor();  

                    // bm = BitmapFactory.decodeFileDescriptor(fd,null,options);   

                }  

            }  

            Log.v("ADW", "getArtworkFromFile");  

            options.inSampleSize = 1;  

            options.inJustDecodeBounds = true;  

            BitmapFactory.decodeFileDescriptor(fd, null, options);  

            options.inSampleSize = 500;// computeSampleSize(options, 800);             

            options.inJustDecodeBounds = false;  

            options.inDither = false;  

            options.inPreferredConfig = Bitmap.Config.ARGB_8888;  

  

            bm = BitmapFactory.decodeFileDescriptor(fd, null, options);  

        } catch (FileNotFoundException ex) {  

  

        }  

        if (bm != null) {  

            mCachedBit = bm;  

        }  

        return bm;  

    }  

  

    static int computeSampleSize(BitmapFactory.Options options, int target) {  

        int w = options.outWidth;  

        int h = options.outHeight;  

        int candidateW = w / target;  

        int candidateH = h / target;  

        int candidate = Math.max(candidateW, candidateH);  

        if (candidate == 0)  

            return 1;  

        if (candidate > 1) {  

            if ((w > target) && (w / candidate) < target)  

                candidate -= 1;  

        }  

        if (candidate > 1) {  

            if ((h > target) && (h / candidate) < target)  

                candidate -= 1;  

        }  

        Log.v("ADW", "candidate:" + candidate);  

        return candidate;  

    }  

  

    private static Bitmap getDefaultArtwork(Context context) {  

        BitmapFactory.Options opts = new BitmapFactory.Options();  

        opts.inPreferredConfig = Bitmap.Config.RGB_565;  

        return BitmapFactory.decodeStream(context.getResources()  

                .openRawResource(R.drawable.item), null, opts);  

    }  

  

    private static final Uri sArtworkUri = Uri  

            .parse("content://media/external/audio/albumart");  

    private static final BitmapFactory.Options sBitmapOptions = new BitmapFactory.Options();  

    private static Bitmap mCachedBit = null;  

  

    class ViewHolder {  

        public TextView tv_music, tv_singer, tv_time;  

        public ImageView img;  

    }  

}  

</SPAN>  

 

/**

 * 

 */

package com.android.musicplayer.adapter;

 

import java.io.FileDescriptor;

import java.io.FileNotFoundException;

import java.io.IOException;

import java.io.InputStream;

import com.android.musicplayer.activity.R;

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.os.ParcelFileDescriptor;

import android.provider.MediaStore;

import android.util.Log;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

import android.widget.BaseAdapter;

import android.widget.ImageView;

import android.widget.TextView;

 

/**

 * @author Administrator

 * 

 */

public class MusicListAdapter extends BaseAdapter {

 

private Context myContext;

private Cursor myCursor;

private int pos = -1;

 

public MusicListAdapter(Context context, Cursor cursor) {

myContext = context;

myCursor = cursor;

}

 

@Override

public int getCount() {

return myCursor.getCount();

}

 

@Override

public Object getItem(int position) {

return position;

}

 

@Override

public long getItemId(int position) {

return position;

}

 

@Override

public View getView(int position, View convertView, ViewGroup parent) {

ViewHolder holder = null;

View vi = convertView;

if (convertView == null) {

holder = new ViewHolder();

vi = LayoutInflater.from(myContext).inflate(R.layout.musiclist,

null);

holder.tv_music = (TextView) vi.findViewById(R.id.music1);

holder.tv_singer = (TextView) vi.findViewById(R.id.singer);

holder.tv_time = (TextView) vi.findViewById(R.id.time);

holder.img = (ImageView) vi.findViewById(R.id.listitem);

vi.setTag(holder);

} else {

holder = (ViewHolder) convertView.getTag();

}

myCursor.moveToPosition(position);

if (myCursor.getString(0).length() > 15) {

try {

String musicTitle = myCursor.getString(0).trim()

.substring(0, 12)

+ "...";

holder.tv_music.setText(musicTitle);

} catch (Exception e) {

 

e.printStackTrace();

}

} else {

holder.tv_music.setText(myCursor.getString(0).trim());

}

if (myCursor.getString(2).equals("<unknown>")) {

holder.tv_singer.setText("未知艺术家?");

} else {

holder.tv_singer.setText(myCursor.getString(2));

}

if (position == pos) {

holder.img.setImageResource(R.drawable.isplaying);

} else {

// img.setImageResource(R.drawable.item);

Bitmap bm = getArtwork(myContext, myCursor.getInt(3),

myCursor.getInt(myCursor

.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID)),

true);

holder.img.setImageBitmap(bm);

}

return vi;

}

 

public void setItemIcon(int position) {

pos = position;

}

 

public String toTime(int time) {

 

time /= 1000;

int minute = time / 60;

int hour = minute / 60;

int second = time % 60;

minute %= 60;

return String.format("%02d:%02d", minute, second);

}

 

public static Bitmap getArtwork(Context context, long song_id,

long album_id, boolean allowdefault) {

Log.v("ADW", "getArtwork");

if (album_id < 0) {

// This is something that is not in the database, so get the album

// art directly

// from the file.

if (song_id >= 0) {

Bitmap bm = getArtworkFromFile(context, song_id, -1);

if (bm != null) {

return bm;

}

}

if (allowdefault) {

return getDefaultArtwork(context);

}

return null;

}

ContentResolver res = context.getContentResolver();

Uri uri = ContentUris.withAppendedId(sArtworkUri, album_id);

if (uri != null) {

InputStream in = null;

try {

in = res.openInputStream(uri);

BitmapFactory.Options options = new BitmapFactory.Options();

options.inSampleSize = 1;

options.inJustDecodeBounds = true;

BitmapFactory.decodeStream(in, null, options);

options.inSampleSize = computeSampleSize(options, 30);

options.inJustDecodeBounds = false;

options.inDither = false;

options.inPreferredConfig = Bitmap.Config.ARGB_8888;

in = res.openInputStream(uri);

return BitmapFactory.decodeStream(in, null, options);

} catch (FileNotFoundException ex) {

// The album art thumbnail does not actually exist. Maybe the

// user deleted it, or

// maybe it never existed to begin with.

Bitmap bm = getArtworkFromFile(context, song_id, album_id);

if (bm != null) {

if (bm.getConfig() == null) {

bm = bm.copy(Bitmap.Config.RGB_565, false);

if (bm == null && allowdefault) {

return getDefaultArtwork(context);

}

}

} else if (allowdefault) {

bm = getDefaultArtwork(context);

}

return bm;

} finally {

try {

if (in != null) {

in.close();

}

} catch (IOException ex) {

}

}

}

 

return null;

}

 

private static Bitmap getArtworkFromFile(Context context, long songid,

long albumid) {

Bitmap bm = null;

byte[] art = null;

String path = null;

if (albumid < 0 && songid < 0) {

throw new IllegalArgumentException(

"Must specify an album or a song id");

}

try {

 

BitmapFactory.Options options = new BitmapFactory.Options();

 

FileDescriptor fd = null;

if (albumid < 0) {

Uri uri = Uri.parse("content://media/external/audio/media/"

+ songid + "/albumart");

ParcelFileDescriptor pfd = context.getContentResolver()

.openFileDescriptor(uri, "r");

if (pfd != null) {

fd = pfd.getFileDescriptor();

// bm = BitmapFactory.decodeFileDescriptor(fd,null,options);

}

} else {

Uri uri = ContentUris.withAppendedId(sArtworkUri, albumid);

ParcelFileDescriptor pfd = context.getContentResolver()

.openFileDescriptor(uri, "r");

if (pfd != null) {

fd = pfd.getFileDescriptor();

// bm = BitmapFactory.decodeFileDescriptor(fd,null,options);

}

}

Log.v("ADW", "getArtworkFromFile");

options.inSampleSize = 1;

options.inJustDecodeBounds = true;

BitmapFactory.decodeFileDescriptor(fd, null, options);

options.inSampleSize = 500;// computeSampleSize(options, 800);

options.inJustDecodeBounds = false;

options.inDither = false;

options.inPreferredConfig = Bitmap.Config.ARGB_8888;

 

bm = BitmapFactory.decodeFileDescriptor(fd, null, options);

} catch (FileNotFoundException ex) {

 

}

if (bm != null) {

mCachedBit = bm;

}

return bm;

}

 

static int computeSampleSize(BitmapFactory.Options options, int target) {

int w = options.outWidth;

int h = options.outHeight;

int candidateW = w / target;

int candidateH = h / target;

int candidate = Math.max(candidateW, candidateH);

if (candidate == 0)

return 1;

if (candidate > 1) {

if ((w > target) && (w / candidate) < target)

candidate -= 1;

}

if (candidate > 1) {

if ((h > target) && (h / candidate) < target)

candidate -= 1;

}

Log.v("ADW", "candidate:" + candidate);

return candidate;

}

 

private static Bitmap getDefaultArtwork(Context context) {

BitmapFactory.Options opts = new BitmapFactory.Options();

opts.inPreferredConfig = Bitmap.Config.RGB_565;

return BitmapFactory.decodeStream(context.getResources()

.openRawResource(R.drawable.item), null, opts);

}  www.2cto.com

 

private static final Uri sArtworkUri = Uri

.parse("content://media/external/audio/albumart");

private static final BitmapFactory.Options sBitmapOptions = new BitmapFactory.Options();

private static Bitmap mCachedBit = null;

 

class ViewHolder {

public TextView tv_music, tv_singer, tv_time;

public ImageView img;

}

}