读取手机里的音乐

//音乐进度条更新

private Handler handler=new Handler(new Handler.Callback() {
    @Override
    public boolean handleMessage(Message msg) {
      //  int progress  = msg.arg1;
        if (msg.what==1){
            int position = mediaPlayer.getCurrentPosition();
            seek_bar.setProgress(position);
            currenttime_tv.setText(parseTime(position));
            updateProgress();
        }
        return true;
    }
});

    private void updateProgress(){
        handler.sendEmptyMessageDelayed(1,1000);
    }

// 解析时间
private String parseTime(int oldTime) {
    SimpleDateFormat sdf = new SimpleDateFormat("mm:ss");// 时间格式
    String newTime = sdf.format(new Date(oldTime));
    return newTime;
}

 

public class MainActivity extends AppCompatActivity {

    protected ListView mListView;
    private List<MediaInfo> mMediaInfoList;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        super.setContentView(R.layout.activity_main);
        initView();

        mMediaInfoList = getDatas();
    }

    private void initView() {
        mListView = (ListView) findViewById(R.id.list_view);
    }

    // 获取系统媒体数据库中的音频多媒体信息
    private List<MediaInfo> getDatas() {
        List<MediaInfo> list = new ArrayList<>();

        // 使用内容解析者访问系统提供的数据库
        Cursor cursor = getContentResolver()
                .query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI,
                        null,
                        null,
                        null,
                        MediaStore.Audio.Media.DEFAULT_SORT_ORDER);// 默认排序顺序
        // 如果游标读取时还有下一个数据，读取

        int idIndex = cursor.getColumnIndex(MediaStore.Audio.Media._ID);//获取列名对应的索引
        int titleIndex = cursor.getColumnIndex(MediaStore.Audio.Media.TITLE);// 标题
        int artistIndex = cursor.getColumnIndex(MediaStore.Audio.Media.ARTIST);// 艺术家
        int uriIndex = cursor.getColumnIndex(MediaStore.Audio.Media.DATA);// 文件路径
        while (cursor.moveToNext()) {
            // 根据索引值获取对应列名中的数值
            long _id = cursor.getLong(idIndex);
            String title = cursor.getString(titleIndex);
            String artist = cursor.getString(artistIndex);
            String uri = cursor.getString(uriIndex);

            MediaInfo mediaInfo = new MediaInfo(_id, uri, title, artist);

            list.add(mediaInfo);
        }

        for (MediaInfo mediaInfo : list) {
            Log.d("1507", "" + mediaInfo.toString());
        }
        return list;
    }

}

//播放音乐以及切换上一首下一首歌曲，当播放完毕之后自动播放下一首

private void changeMusic(int position) {
    if (position < 0) {
        position = list.size() - 1;
        mCurrentPosition = position;
    } else if (position > list.size() - 1) {
        position = 0;
        mCurrentPosition = position;
    }

    if (mediaPlayer == null) {
        mediaPlayer = new MediaPlayer();
        mediaPlayer.setOnCompletionListener(this);

    }

    try {
        mediaPlayer.reset();
        mediaPlayer.setDataSource(list.get(position).getUri());
        mediaPlayer.prepare();
        mediaPlayer.start();
    } catch (IOException e) {
        e.printStackTrace();
    }
    seek_bar.setProgress(0);
    seek_bar.setMax(mediaPlayer.getDuration());
    alltimes_tv.setText(parseTime(mediaPlayer.getDuration()));
    updateProgress();

}
//