Question

我正在尝试制作一个基本的音乐应用程序，但是由于某种原因，我的getContentResolver似乎没有在模拟器上返回mp3。

代码如下：

columns = new String[] {
        MediaStore.Audio.AudioColumns.ARTIST,
        MediaStore.Audio.AudioColumns.TITLE,
        MediaStore.Audio.AudioColumns.ALBUM,
        MediaStore.Audio.AudioColumns.ALBUM_ID,
        MediaStore.Audio.AudioColumns.IS_MUSIC
};

cursor = context.getContentResolver().query(
        MediaStore.Audio.Media.INTERNAL_CONTENT_URI,
        columns,
        MediaStore.Audio.Media.IS_MUSIC + " = 1",
        null,
        null
);

现在，我将mp3文件夹拖到手机上，并将其移动到内部存储器的“音乐”文件夹中。他们在那里，他们有一个文件大小。当我遍历光标时，会得到以下列表：

<unknown>: KeypressSpacebar, ui, isMusic: 1
<unknown>: Lock, ui, isMusic: 1
<unknown>: Unlock, ui, isMusic: 1
(c) 2012 Android Open Source Project: Video Record, ui, isMusic: 1
(c) 2012 Android Open Source Project: Camera Shutter, ui, isMusic: 1
<unknown>: Effect_Tick, ui, isMusic: 1
<unknown>: camera_focus, ui, isMusic: 1
(c) 2012 Android Open Source Project: Video Stop, ui, isMusic: 1
<unknown>: Dock, ui, isMusic: 1
Copyright 2013 Android Open Source Project: KeypressInvalid, ui, isMusic: 1
<unknown>: Trusted, ui, isMusic: 1
<unknown>: KeypressStandard, ui, isMusic: 1
<unknown>: KeypressReturn, ui, isMusic: 1
<unknown>: Low Battery, ui, isMusic: 1
<unknown>: Undock, ui, isMusic: 1
<unknown>: KeypressDelete, ui, isMusic: 1
<unknown>: WirelessChargingStarted, ui, isMusic: 1

应该是artist: title, album, is_music。

为什么不接我的mp3？我需要刷新吗？重新启动仿真器也没有任何区别。

编辑：我将文件移至外部存储，并切换了getContentResolver到那里，现在显示了文件。但是我不明白为什么它不会从内部显示？而且，为什么显示的文件被列为Is_Music，它们肯定是UI？

Edit2：我像这样遍历光标：

if(cursor != null) {
    while(cursor.moveToNext()) {
            String artist = cursor.getString(0);
            String title = cursor.getString(1);
            String album = cursor.getString(2);

        Log.d("MediaContent::", "getMusicFiles: " + artist + ": " + title + ", " + album + ", isMusic: " + String.valueOf(cursor.getInt(4)));
    }
    cursor.close();
}

getContentResolver（）不返回mp3吗？

0 个答案: