android读取指定目录下音乐文件并显示在xml中_框架

mData = new ArrayList<ChoseMusicBean>();

File f = new File(DEFAULT_SOUND_PATH);

File[] files = flistFiles();

if (files != null) {

int count = fileslength;

for (int i = 0; i < count; i++) {

File file = files[i];

ChoseMusicBean bean = new ChoseMusicBean(filegetName());

mDataadd(bean);

}

Adapter adapter=new adapter(context,mData);

listviewsetAdapter(adapter);

DEFAULT_SOUND_PATH是音乐文件路径

ContentResolver mResolver = getContentResolver();

Cursor cursor = mResolverquery(MediaStoreAudioMediaEXTERNAL_CONTENT_URI, null, null, null, MediaStoreAudioMediaDEFAULT_SORT_ORDER);

int i = 0;

int cursorCount = cursorgetCount();

if (cursorCount >0 )

{

cursormoveToFirst();

while (i < cursorCount)

{

//歌曲文件的路径：MediaStoreAudioMediaDATA

url = cursorgetString(cursorgetColumnIndexOrThrow(MediaStoreAudioMediaDATA));

if(urltoLowerCase()indexOf("指定的歌曲路径") > 0)

{

}

i++;

cursormoveToNext();

}

cursorclose();

}

安卓系统在开机的时候就会自动检测SD卡的文件，并将音乐文件搜集生成一个数据库文件。我们只需访问数据库表中的信息就能得到所需的文件

代码如下：

<span style="font-size:14px; white-space: pre;"> </span><span style="font-size:14px;">// 获取所有歌曲

Cursor cursor = crquery(

MediaStoreAudioMediaEXTERNAL_CONTENT_URI, null, null,

null, MediaStoreAudioMediaDEFAULT_SORT_ORDER);</span>

得到cursor对象就能访问cursor里的媒体资源

Intent intent=new Intent(IntentACTION_PICK,androidproviderMediaStoreAudioMediaEXTERNAL_CONTENT_URI); //打开音乐库

startActivityForResult(intent, reqCode);

这是抽取专辑的方法，扫描歌曲的时候自己把歌曲的id和专辑的id传进去就能获取

private static final Uri sArtworkUri = Uri

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

将MP3里读取出来

@param context

@param songid

@param albumid

@return

public static Bitmap getMusicBitemp(Context context, long songid,

long albumid) {

Bitmap bm = null;

// 专辑id和歌曲id小于0说明没有专辑、歌曲，并抛出异常

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

throw new IllegalArgumentException(

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

}

try {

if (albumid < 0) {

Uri uri = Uriparse("content://media/external/audio/media/"

+ songid + "/albumart");

ParcelFileDescriptor pfd = contextgetContentResolver()

openFileDescriptor(uri, "r");

if (pfd != null) {

FileDescriptor fd = pfdgetFileDescriptor();

bm = BitmapFactorydecodeFileDescriptor(fd);

}

} else {

Uri uri = ContentUriswithAppendedId(sArtworkUri, albumid);

ParcelFileDescriptor pfd = contextgetContentResolver()

openFileDescriptor(uri, "r");

if (pfd != null) {

FileDescriptor fd = pfdgetFileDescriptor();

bm = BitmapFactorydecodeFileDescriptor(fd);

} else {

return null;

}

} catch (FileNotFoundException ex) {

}

return bm;

}

另一种：

// 查找sdcard卡上的所有歌曲信息

public List> getMultiData() {

ArrayList> musicList = new ArrayList>();

// 加入封装音乐信息的代码

// 查询所有歌曲

ContentResolver musicResolver = thisgetContentResolver();

Cursor musicCursor = musicResolverquery(

MediaStoreAudioMediaEXTERNAL_CONTENT_URI, null, null, null,

null);

int musicColumnIndex;

if (null != musicCursor && musicCursorgetCount() > 0) {

for (musicCursormoveToFirst(); !musicCursorisAfterLast(); musicCursor

moveToNext()) {

Map musicDataMap = new HashMap();

Random random = new Random();

int musicRating = Mathabs(randomnextInt()) % 10;

musicDataMapput("musicRating", musicRating);

// 取得音乐播放路径