列出所有的Andr​​oid设备一个文件类型的？ [英] List all of one file type on Android device?

问题描述

例如，我要找回对内部和外部存储的所有.mp3文件的列表。我也想了路径参考每个.MP3文件（字符串）（它们存储在一个列表？）我怎么能这样做？这是一个相对昂贵的操作？如果是的话，它应该被放在一个线程同时运行，present与加载用户 ProgressDialog ？

For example, I want to retrieve a list of all .mp3 files on the internal AND external storage. I would also like the path (String) of each .mp3 file for reference (store them in a List?) How could I do this? Is this a relatively expensive operation? If so, should it be put on a thread and while that is running, present the user with a "Loading" ProgressDialog?

推荐答案

请找到以下的功能。它会得到所有存储在外部和内部存储器中的MP3文件。

Please find the function below . It will get all the mp3 files stored in external and Internal memory .

public void getAllSongs() {

    Uri allsongsuri = MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;
    String selection = MediaStore.Audio.Media.IS_MUSIC + " != 0";

    cursor = managedQuery(allsongsuri, STAR, selection, null, null);

    if (cursor != null) {
        if (cursor.moveToFirst()) {
            do {
                song_name = cursor
                        .getString(cursor
                                .getColumnIndex(MediaStore.Audio.Media.DISPLAY_NAME));
                int song_id = cursor.getInt(cursor
                        .getColumnIndex(MediaStore.Audio.Media._ID));

                String fullpath = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.DATA));
                fullsongpath.add(fullpath);

                album_name = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ALBUM));
                int album_id = cursor.getInt(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));

                artist_name = cursor.getString(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ARTIST));
                int artist_id = cursor.getInt(cursor
                        .getColumnIndex(MediaStore.Audio.Media.ARTIST_ID));


            } while (cursor.moveToNext());

        }
        cursor.close();
        db.closeDatabase();
    }
}

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