[英]Android Mediastore: How to efficiently retrieve all songs of a certain genre?
Uri uri = Audio.Genres.Members.getContentUri("external", genreID);
String[] projection = new String[]{Audio.Media.TITLE, Audio.Media._ID};
Cursor cur = contentResolver.query(uri, projection, null, null, null);
您可以通过组合内容URI并查询MediaStore来完成此操作。 这是从Android音乐播放器借来的一些代码:
String [] cols = new String [] {MediaStore.Audio.Genres.NAME};
Cursor cursor = MusicUtils.query(this,
ContentUris.withAppendedId(MediaStore.Audio.Genres.EXTERNAL_CONTENT_URI, Long.valueOf(mGenre)),
cols, null, null, null);
这是MusicUtils中的代码:
public static Cursor query(Context context, Uri uri, String[] projection,
String selection, String[] selectionArgs, String sortOrder, int limit) {
try {
ContentResolver resolver = context.getContentResolver();
if (resolver == null) {
return null;
}
if (limit > 0) {
uri = uri.buildUpon().appendQueryParameter("limit", "" + limit).build();
}
return resolver.query(uri, projection, selection, selectionArgs, sortOrder);
} catch (UnsupportedOperationException ex) {
ErrorReporter.getInstance().putCustomData("UnsupportedOperationException", "true");
return null;
}
}
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