2
我在設備上使用以下代碼至scan all media/mp3
文件,但設備上音樂太多時需要很長時間。安卓媒體掃描時間太長
我想知道是否有更快捷的方式獲取並顯示所有音樂?
注:該代碼不會導致崩潰或掛斷或任何其他事情......
class GetLocals extends AsyncTask<Void,Void,Void> {
@Override
protected void onPreExecute() {
super.onPreExecute();
SongCover_lc.clear();
SongID_lc.clear();
Singer_lc.clear();
Path_lc.clear();
AlbumName_lc.clear();
SongName_lc.clear();
}
@Override
protected Void doInBackground(Void... voids) {
try {
String[] STAR = {"*"};
Cursor cursor;
Uri uri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";
cursor = context.getContentResolver().query(uri, STAR, selection, null, null);
if (cursor != null) {
if (cursor.moveToFirst()) {
do {
String songName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.TITLE));
String path = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.DATA));
String albumName = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM));
String singer = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST));
String songid = cursor.getString(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));
MediaMetadataRetriever mmr = new MediaMetadataRetriever();
mmr.setDataSource(path);
byte[] artBytes = mmr.getEmbeddedPicture();
if (artBytes != null) {
InputStream is = new ByteArrayInputStream(mmr.getEmbeddedPicture());
Bitmap bm = BitmapFactory.decodeStream(is);
SongCover_lc.add(bm);
} else {
SongCover_lc.add(BitmapFactory.decodeResource(getResources(), R.color.white));
}
SongName_lc.add(songName);
AlbumName_lc.add(albumName);
Path_lc.add(path);
Singer_lc.add(singer);
SongID_lc.add(songid);
} while (cursor.moveToNext());
}
}
} catch (Exception e){
System.out.println("CAAAAAAAAAAATCH");
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
lazyAdapter_localSongs = new LazyAdapter_LocalSongs(activity,SongName_lc,Singer_lc,SongCover_lc,AlbumName_lc,Path_lc);
listviewloclas.setAdapter(lazyAdapter_localSongs);
}
}
請注意,掃描速度可能在很大程度上取決於設備上各自使用的SD卡(如果在外部SD上)(以及使用哪個內部存儲器H/W)。 – Fildor
@Fildor以及我已經測試過許多設備,甚至有免費空間的模擬器!但我仍然有一個低速 –
此外,您可以將其分成:1.獲取音樂列表,2.稍後更新查看專輯封面。您可能不會始終顯示完整列表,因此不需要獲取所有位圖。只需獲取您實際需要的圖片(也許預取接下來的幾個用戶可以到的頁面) – Fildor