音乐工具类
/**
* 音乐工具类,
*/
public class MusicUtils { public static ListgetMusicData(Context context) { Listlist = new ArrayList();
// 媒体库查询语句（写一个工具类MusicUtils）
Cursor cursor = context.getContentResolver().query(MediaStore.Audio.Media.EXTERNAL_CONTENT_URI, null, null,
null, MediaStore.Audio.AudioColumns.IS_MUSIC);
if (cursor != null) {
while (cursor.moveToNext()) {
Song song = new Song();
song.song = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DISPLAY_NAME));
song.singer = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.ARTIST));
song.path = cursor.getString(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DATA));
song.duration = cursor.getInt(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.DURATION));
song.size = cursor.getLong(cursor.getColumnIndexOrThrow(MediaStore.Audio.Media.SIZE));
if (song.size > 1000 * 800) {
if (song.song.contains("-")) {
String[] str = song.song.split("-");
song.singer = str[0];
song.song = str[1];
}
list.add(song);
}
}
cursor.close();
}
return list;
}
public static String formatTime(int time) {
if (time / 1000 % 60 < 10) {
return time / 1000 / 60 + ":0" + time / 1000 % 60;
} else {
return time / 1000 / 60 + ":" + time / 1000 % 60;
}
}
}
自定义存储音乐的Bean类
public class Song {
@Override
public String toString() {
return "Song{" +
"singer='" + singer + '\'' +
", song='" + song + '\'' +
", path='" + path + '\'' +
", duration=" + duration +
", size=" + size +
'}';
}
public String getSinger() {
return singer;
}
public void setSinger(String singer) {
this.singer = singer;
}
public String getSong() {
return song;
}
public void setSong(String song) {
this.song = song;
}
public String getPath() {
return path;
}
public void setPath(String path) {
this.path = path;
}
public int getDuration() {
return duration;
}
public void setDuration(int duration) {
this.duration = duration;
}
public long getSize() {
return size;
}
public void setSize(long size) {
this.size = size;
}
public Song() {
this.singer = singer;
this.song = song;
this.path = path;
this.duration = duration;
this.size = size;
}
/**
* 歌手
*/
public String singer;
/**
* 歌曲名
*/
public String song;
/**
* 歌曲的地址
*/
public String path;
/**
* 歌曲长度
*/
public int duration;
/**
* 歌曲的大小
*/
public long size;
}
主页面实现音乐播放器功能
public class MainActivity extends AppCompatActivity implements View.OnClickListener,SeekBar.OnSeekBarChangeListener, MediaPlayer.OnCompletionListener { private MediaPlayer mMediaPlayer; protected Button mPreviousBtn; protected Button mPlayBtn; protected Button mNextBtn; protected TextView mCurrentTimeTv; protected TextView mTotalTimeTv; protected SeekBar mSeekBar; private ListView mListView; private Listlist;
private MyAdapter adapter;
// 记录当前播放歌曲的位置
private int mCurrentPosition;
private Handler mHandler = new Handler(new Handler.Callback() {
@Override
public boolean handleMessage(Message msg) {
// 展示给进度条和当前时间
int progress = mMediaPlayer.getCurrentPosition();
mSeekBar.setProgress(progress);
mCurrentTimeTv.setText(parseTime(progress));
// 继续定时发送数据
updateProgress();
return true;
}
});
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
mMediaPlayer= new MediaPlayer();
initView();
}
private void initView() {
mListView = (ListView) findViewById(R.id.main_listview);
mPreviousBtn = (Button) findViewById(R.id.previous_btn);
mPreviousBtn.setOnClickListener(MainActivity.this);
mPlayBtn = (Button) findViewById(R.id.play_btn);
mPlayBtn.setOnClickListener(MainActivity.this);
mNextBtn = (Button) findViewById(R.id.next_btn);
mNextBtn.setOnClickListener(MainActivity.this);
mCurrentTimeTv = (TextView) findViewById(R.id.current_time_tv);
mTotalTimeTv = (TextView) findViewById(R.id.total_time_tv);
mSeekBar = (SeekBar) findViewById(R.id.seek_bar);
// SeekBar绑定监听器，监听拖动到指定位置
mSeekBar.setOnSeekBarChangeListener(MainActivity.this);
list = new ArrayList<>();
list = MusicUtils.getMusicData(this);
adapter = new MyAdapter(this,list);
mListView.setAdapter(adapter);
mListView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView adapterView, View view, int position, long l) {
mCurrentPosition = position;
changeMusic(mCurrentPosition);
}
});
}
// 切歌
private void changeMusic(int position) {
if (position < 0) {
mCurrentPosition = position = list.size() - 1;
} else if (position > list.size() - 1) {
mCurrentPosition = position = 0;
}
if (mMediaPlayer == null) {
mMediaPlayer = new MediaPlayer();
// 绑定播放完毕监听器
mMediaPlayer.setOnCompletionListener(this);
}
try {
// 切歌之前先重置，释放掉之前的资源
mMediaPlayer.reset();
// 设置播放源
mMediaPlayer.setDataSource(list.get(position).getPath());
// 开始播放前的准备工作，加载多媒体资源，获取相关信息
mMediaPlayer.prepare();
// 开始播放
mMediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
Toast.makeText(this, "播放错误", Toast.LENGTH_SHORT).show();
}
// 切歌时重置进度条并展示歌曲时长
mSeekBar.setProgress(0);
mSeekBar.setMax(mMediaPlayer.getDuration());
mTotalTimeTv.setText(parseTime(mMediaPlayer.getDuration()));
updateProgress();
}
@Override
public void onClick(View view) {
if (view.getId() == R.id.previous_btn) {// 上一首
changeMusic(--mCurrentPosition);
} else if (view.getId() == R.id.play_btn) {// 播放/暂停
// 首次点击播放按钮，默认播放第0首
if (mMediaPlayer == null) {
changeMusic(0);
} else {
playOrPause();
}
} else if (view.getId() == R.id.next_btn) {// 下一首
changeMusic(++mCurrentPosition);
}
}
// 播放或暂停
private void playOrPause() {
if (mMediaPlayer.isPlaying()) {
mMediaPlayer.pause();
} else {
mMediaPlayer.start();
}
}
private void updateProgress() {
// 使用Handler每间隔1s发送一次空消息，通知进度条更新
Message msg = Message.obtain();// 获取一个现成的消息
mHandler.sendMessageDelayed(msg, INTERNAL_TIME);
}
private static final int INTERNAL_TIME = 1000;// 音乐进度间隔时间
private String parseTime(int oldTime) {
SimpleDateFormat sdf = new SimpleDateFormat("mm:ss");// 时间格式
String newTime = sdf.format(new Date(oldTime));
return newTime;
}
@Override
public void onCompletion(MediaPlayer mediaPlayer) {
// 当歌曲播放完毕，切歌到下一首
changeMusic(++mCurrentPosition);
}
@Override
public void onProgressChanged(SeekBar seekBar, int i, boolean b) {
}
@Override
public void onStartTrackingTouch(SeekBar seekBar) {
}
@Override
public void onStopTrackingTouch(SeekBar seekBar) {
int progress = seekBar.getProgress();
mMediaPlayer.seekTo(progress);
}
}
List适配器实现item点击事件
public class MyAdapter extends BaseAdapter { private Context context; private Listlist; public MyAdapter(MainActivity mainActivity, Listlist) {
this.context = mainActivity;
this.list = list;
}
@Override
public int getCount() {
return list.size();
}
@Override
public Object getItem(int i) {
return list.get(i);
}
@Override
public long getItemId(int i) {
return i;
}
@Override
public View getView(final int i, View view, ViewGroup viewGroup) {
ViewHolder holder = null;
if (view == null) {
holder = new ViewHolder();
view = View.inflate(context, R.layout.item_music_listview, null);
holder.song = (TextView) view.findViewById(R.id.item_mymusic_song);
holder.singer = (TextView) view.findViewById(R.id.item_mymusic_singer);
holder.duration = (TextView) view.findViewById(R.id.item_mymusic_duration);
holder.position = (TextView) view.findViewById(R.id.item_mymusic_postion);
view.setTag(holder);
} else {
holder = (ViewHolder) view.getTag();
}
holder.song.setText(list.get(i).song.toString());
holder.singer.setText(list.get(i).singer.toString());
int duration = list.get(i).duration;
String time = MusicUtils.formatTime(duration);
holder.duration.setText(time);
holder.position.setText("");
return view;
}
class ViewHolder{
TextView song;
TextView singer;
TextView duration;
TextView position;
String parh;
}
}
