如何从MediaStore.File和MediaStore.File.FileColumn获取数据

Question

我正在尝试获取包含音频文件的所有文件名，我使用Mediastore获得了纵隔音频、专辑、播放列表和音频数据，但是如何获得包含音频文件.Here的文件或文件夹标题是我尝试过的代码，但它是不正确的，因为我无法设置External_Content_uri。这是我试过的密码。

  private void External() {
    try {
        String[] proj = {MediaStore.Files.FileColumns.TITLE,
                MediaStore.Files.FileColumns._ID,
                MediaStore.Files.FileColumns.PARENT,
                MediaStore.Files.FileColumns.DATA
        };// Can include more data for more details and check it.

        String selection =MediaStore.Files.FileColumns.MEDIA_TYPE+"=?";

        String[] selectionArgs = {"MediaStore.Files.FileColumns.MEDIA_TYPE_AUDIO"};

        String sortOrder = MediaStore.Audio.Media.TITLE + " ASC";

        Cursor audioCursor = getContentResolver().query(MediaStore.Files.getContentUri("\"external\""), proj, selection, selectionArgs, sortOrder);

        if (audioCursor != null) {
            if (audioCursor.moveToFirst()) {
                do {
                    int filetitle = audioCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.TITLE);
                    int file_id = audioCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns._ID);
                    int fileparent = audioCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.PARENT);
                    int filedata = audioCursor.getColumnIndexOrThrow(MediaStore.Files.FileColumns.DATA);
                    Mediafileinfo info = new Mediafileinfo();
                    info.setData(new File(new File(audioCursor.getString(filedata)).getParent()).getName());
                    info.setTitle(audioCursor.getString(filetitle));
                    info.set_id(audioCursor.getString(file_id));
                    info.setParent(audioCursor.getString(fileparent));
                   // info.setData(audioCursor.getString(filedata));
                    audioList.add(info);
                } while (audioCursor.moveToNext());
            }
        }
        assert audioCursor != null;
        audioCursor.close();
    } catch (Exception e) {
        e.printStackTrace();
    }
}

我尝试了这和这示例，但是我无法得到解决方案。

Answer 1

写一个新的答案，因为你想要的只是音频文件的文件夹名。

所以这里使用的最好的东西是MediaStore.Audio.Media，而不是MediaStore.File。使用音频文件路径上的以下内容获取文件夹名。

new File(new File(audioCursor.getString(filedata)).getParent()).getName()

private void External() {
try {
    Uri externalUri= MediaStore.Audio.Media.EXTERNAL_CONTENT_URI;

    projection=new String[]{MediaStore.Audio.Media._ID,
            MediaStore.Audio.Media.TITLE,
            MediaStore.Audio.Media.DATA,;

    String selection =null;

    String[] selectionArgs = null;

    String sortOrder = MediaStore.Audio.Media.TITLE + " ASC";

    Cursor audioCursor = getContentResolver().query(externalUri, proj, selection, selectionArgs, sortOrder);

    if (audioCursor != null) {
        if (audioCursor.moveToFirst()) {
            do {
                int filetitle = audioCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE);
                int file_id = audioCursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID);
                int filePath = audioCursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA);
                Mediafileinfo info = new Mediafileinfo();
                info.setData(new File(new File(audioCursor.getString(filedata)).getParent()).getName());
                info.setTitle(audioCursor.getString(filetitle));
                info.set_id(audioCursor.getString(file_id));
                audioList.add(info);
            } while (audioCursor.moveToNext());
        }
    }
    assert audioCursor != null;
    audioCursor.close();
} catch (Exception e) {
    e.printStackTrace();
}
}

Answer 2

嗨，使用和查询媒体文件，如音频、图像和视频，请查看本教程

http://www.androiddevelopersolutions.com/2015/12/android-media-store-tutorial-list-all.html

列出所有图像的：

private void parseAllImages() {
    try {
        String[] projection = {MediaStore.Images.Media.DATA};
        cursor = getContentResolver().query(MediaStore.Images.Media.EXTERNAL_CONTENT_URI,
                projection, // Which columns to return
                null,       // Return all rows
                null,
                null);


        int size = cursor.getCount();

        /*******  If size is 0, there are no images on the SD Card. *****/

        if (size == 0) {

        } else {

            int thumbID = 0;
            while (cursor.moveToNext()) {

                int file_ColumnIndex = cursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);

                /**************** Captured image details ************/

                /*****  Used to show image on view in LoadImagesFromSDCard class ******/
                String path = cursor.getString(file_ColumnIndex);

                String fileName = path.substring(path.lastIndexOf("/") + 1, path.length());

                MediaFileInfo mediaFileInfo = new MediaFileInfo();
                mediaFileInfo.setFilePath(path);
                mediaFileInfo.setFileName(fileName);
                mediaFileInfo.setFileType(type);
                mediaList.add(mediaFileInfo);
            }
        }


    } catch (Exception e) {
        e.printStackTrace();
    }

}

用于列出所有视频(.mp4)

private void parseAllVideo() {
    try {
        String name = null;
        String[] thumbColumns = {MediaStore.Video.Thumbnails.DATA,
                MediaStore.Video.Thumbnails.VIDEO_ID};

        int video_column_index;
        String[] proj = {MediaStore.Video.Media._ID,
                MediaStore.Video.Media.DATA,
                MediaStore.Video.Media.DISPLAY_NAME,
                MediaStore.Video.Media.SIZE};
        Cursor videocursor = getContentResolver().query(MediaStore.Video.Media.EXTERNAL_CONTENT_URI,
                proj, null, null, null);
        int count = videocursor.getCount();
        Log.d("No of video", "" + count);
        for (int i = 0; i < count; i++) {
            MediaFileInfo mediaFileInfo = new MediaFileInfo();
            video_column_index = videocursor
                    .getColumnIndexOrThrow(MediaStore.Video.Media.DISPLAY_NAME);
            videocursor.moveToPosition(i);
            name = videocursor.getString(video_column_index);

            mediaFileInfo.setFileName(name);

            int column_index = videocursor.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
            videocursor.moveToPosition(i);
            String filepath = videocursor.getString(column_index);

            mediaFileInfo.setFilePath(filepath);
            mediaFileInfo.setFileType(type);
            mediaList.add(mediaFileInfo);
            // id += " Size(KB):" +
            // videocursor.getString(video_column_index);


        }
        videocursor.close();

    } catch (Exception e) {
        e.printStackTrace();
    }

}

用于列出所有音频

private void parseAllAudio() {
    try {
        String TAG = "Audio";
        Cursor cur = getContentResolver().query(
                MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null, null,
                null);

        if (cur == null) {
            // Query failed...
            Log.e(TAG, "Failed to retrieve music: cursor is null :-(");

        }
        else if (!cur.moveToFirst()) {
            // Nothing to query. There is no music on the device. How boring.
            Log.e(TAG, "Failed to move cursor to first row (no query results).");

        }else {
            Log.i(TAG, "Listing...");
            // retrieve the indices of the columns where the ID, title, etc. of the song are

            // add each song to mItems
            do {
                int artistColumn = cur.getColumnIndex(MediaStore.Audio.Media.ARTIST);
                int titleColumn = cur.getColumnIndex(MediaStore.Audio.Media.TITLE);
                int albumColumn = cur.getColumnIndex(MediaStore.Audio.Media.ALBUM);
                int durationColumn = cur.getColumnIndex(MediaStore.Audio.Media.DURATION);
                int idColumn = cur.getColumnIndex(MediaStore.Audio.Media._ID);
                int filePathIndex = cur.getColumnIndexOrThrow(MediaStore.Images.Media.DATA);
                Log.i(TAG, "Title column index: " + String.valueOf(titleColumn));
                Log.i(TAG, "ID column index: " + String.valueOf(titleColumn));

                Log.i("Final ", "ID: " + cur.getString(idColumn) + " Title: " + cur.getString(titleColumn) + "Path: " + cur.getString(filePathIndex));
                MediaFileInfo audio = new MediaFileInfo();
                audio.setFileName(cur.getString(titleColumn));
                audio.setFilePath(cur.getString(filePathIndex));
                audio.setFileType(type);
                mediaList.add(audio);

            } while (cur.moveToNext());
        }

    } catch (Exception e) {
        e.printStackTrace();
    }

}