android 怎么获取音乐专辑图像

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

musicColumnIndex = musicCursor

getColumnIndex(MediaStoreAudioAudioColumnsDATA);

musicPath = musicCursorgetString(musicColumnIndex);

musicDataMapput("musicPath", musicPath);

// 取得音乐的名字

musicColumnIndex = musicCursor

getColumnIndex(MediaStoreAudioAudioColumnsTITLE);

musicName = musicCursorgetString(musicColumnIndex);

musicDataMapput("musicName", musicName);

// 取得音乐的专辑名称

musicColumnIndex = musicCursor

getColumnIndex(MediaStoreAudioAudioColumnsALBUM);

musicAlbum = musicCursorgetString(musicColumnIndex);

musicDataMapput("musicAlbum", musicAlbum);

// 取得音乐的演唱者

musicColumnIndex = musicCursor

getColumnIndex(MediaStoreAudioAudioColumnsARTIST);

musicArtist = musicCursorgetString(musicColumnIndex);

musicDataMapput("musicArtist", musicArtist);

// 取得歌曲对应的专辑对应的Key

musicColumnIndex = musicCursor

getColumnIndex(MediaStoreAudioAudioColumnsALBUM_KEY);

musicAlbumKey = musicCursorgetString(musicColumnIndex);

String[] argArr = { musicAlbumKey };

ContentResolver albumResolver = thisgetContentResolver();

Cursor albumCursor = albumResolverquery(

MediaStoreAudioAlbumsEXTERNAL_CONTENT_URI, null,

MediaStoreAudioAudioColumnsALBUM_KEY + " = ",

argArr, null);

if (null != albumCursor && albumCursorgetCount() > 0) {

albumCursormoveToFirst();

int albumArtIndex = albumCursor

getColumnIndex(MediaStoreAudioAlbumColumnsALBUM_ART);

musicAlbumArtPath = albumCursorgetString(albumArtIndex);

if (null != musicAlbumArtPath

&& !""equals(musicAlbumArtPath)) {

musicDataMapput("musicAlbumImage", musicAlbumArtPath);

} else {

musicDataMapput("musicAlbumImage",

"file:///mnt/sdcard/albjpg");

}

} else {

// 没有专辑定义，给默认

musicDataMapput("musicAlbumImage",

"file:///mnt/sdcard/albjpg");

}

musicListadd(musicDataMap);

}

}

return musicList;

}

用下面这种方式能实现查询实现查询sd卡某一个子目录下的文件详细信息 ：

//selection: 指定查询条件

String selection = MediaStoreImagesMediaDATA + " like %";

//设定查询目录

String path="/mnt/sdcard/youpicpath";

//定义selectionArgs：

String[] selectionArgs = {path+"%"};

c = thisgetContentResolver()query(MediaStoreImagesMediaEXTERNAL_CONTENT_URI, null,

selection, selectionArgs, null);

其实原理就是改变了下查询语句，在查询条件中增加了MediaStoreImagesMediaDATA字段的限制条件，必须是和指定目录能匹配的才被查询，注意selection和selectionArgs参数是配合使用的。

Intent intentFromCapture = new Intent( MediaStoreACTION_IMAGE_CAPTURE);

// checkHasSdcard 自定义函数，判断存储卡是否可用

if (checkHasSdcard()) {

File file = new File(“/mnt/SDCard/temp/”);

if (!fileexists())

filemkdirs();

// /mnt/SDCard/temp/tmp_imagejpg 这是拍照后保存的文件，也就是说要自定义拍照后的文件名

intentFromCaptureputExtra(MediaStoreEXTRA_OUTPUT,

UrifromFile(new File(“/mnt/SDCard/temp/”, "tmp_imagejpg")));

}

startActivityForResult(intentFromCapture, 11);

然后在 onActivityResult 里就可以对读取该文件了。

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