MediaScanner.java

public class MediaScanner {
	private static String AUDIO_PATH = MediaStore.Audio.AudioColumns.DATA;
	private static String AUDIO_DISPLAYHNAME = MediaStore.Audio.AudioColumns.DISPLAY_NAME;
	private static String AUDIO_COLUMN_STRS[] = { AUDIO_PATH, AUDIO_DISPLAYHNAME };

	private static String VIDEO_PATH = MediaStore.Video.VideoColumns.DATA;
	private static String VIDEO_DISPLAYHNAME = MediaStore.Video.VideoColumns.DISPLAY_NAME;
	private static String VIDEO_COLUMN_STRS[] = { VIDEO_PATH, VIDEO_DISPLAYHNAME };

	private static String IMAGE_PATH = MediaStore.Images.ImageColumns.DATA;
	private static String IMAGE_DISPLAYHNAME = MediaStore.Images.ImageColumns.DISPLAY_NAME;
	private static String IMAGE_COLUMN_STRS[] = { IMAGE_PATH, IMAGE_DISPLAYHNAME };

	private MediaScanner() {
	}

	public static List<MediaFile> scanAudio() {
		return scanMedia(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, AUDIO_COLUMN_STRS, AUDIO_DISPLAYHNAME, AUDIO_DISPLAYHNAME, AUDIO_PATH);
	}

	public static List<MediaFile> scanVideo() {
		return scanMedia(MediaStore.Video.Media.EXTERNAL_CONTENT_URI, VIDEO_COLUMN_STRS, VIDEO_DISPLAYHNAME, VIDEO_DISPLAYHNAME, VIDEO_PATH);
	}

	public static List<MediaFile> scanImage() {
		return scanMedia(MediaStore.Images.Media.EXTERNAL_CONTENT_URI, IMAGE_COLUMN_STRS, IMAGE_DISPLAYHNAME, IMAGE_DISPLAYHNAME, IMAGE_PATH);
	}

	public static List<MediaFile> scanMedia(Uri uri, String[] projection, String sortOrder, String nameColumn, String pathColumn) {
		List<MediaFile> results = new ArrayList<MediaFile>();
		Cursor cursor = App.getInstance().getContentResolver().query(uri, projection, null, null, sortOrder);
		if (cursor != null && cursor.getCount() != 0) {
			int nameIndex = cursor.getColumnIndexOrThrow(nameColumn);
			int dirIndex = cursor.getColumnIndexOrThrow(pathColumn);
			while (cursor.moveToNext()) {
				results.add(new MediaFile(cursor.getString(nameIndex), cursor.getString(dirIndex)));
			}
			cursor.close();
		}
		return results;
	}

}