實現功能：

1.實現音樂的播放，暫停，上一首，下一首

2.生成播放列表

3.提示音樂信息

4.顯示播放進度條，且進度條可拖拽

實現截圖：

關鍵代碼分析

public ArrayList<MusicMedia> scanAllAudioFiles(){

        ArrayList<MusicMedia> mylist = new ArrayList<MusicMedia>();


        Cursor cursor = getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null
 
, null, null, MediaStore.Audio.Media.DEFAULT_SORT_ORDER);

        if(cursor.moveToFirst()){
            while (!cursor.isAfterLast()) {

                int id = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media._ID));

                String tilte = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.TITLE));

                String album 
 
= cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ALBUM));
                int albumId = cursor.getInt(cursor.getColumnIndex(MediaStore.Audio.Media.ALBUM_ID));

                String artist = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));

                String url 
 
= cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));

                int duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));

                Long size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE));


                if (size >1024*800){
                    MusicMedia musicMedia = new MusicMedia();
                    musicMedia.setId(id);
                    musicMedia.setArtist(artist);
                    musicMedia.setSize(size);
                    musicMedia.setTitle(tilte);
                    musicMedia.setTime(duration);
                    musicMedia.setUrl(url);
                    musicMedia.setAlbum(album);
                    musicMedia.setAlbumId(albumId);

                    mylist.add(musicMedia);

                }
                cursor.moveToNext();
            }
        }
        return mylist;
    }

此段代碼用於遍歷sd卡的多媒體庫，將所有音樂文件及其各種屬性獲取，並將其顯示在列表中

代碼鏈接：

https://git.dev.tencent.com/gao2039/1600802039.git

apk鏈接：

https://git.dev.tencent.com/gao2039/apk.git

1600802039