代码改变世界

Android第三次作业

2018-12-11 21:19  海海251  阅读(223)  评论(0)    收藏  举报

一、实现的功能

1.读取本地音乐文件

2.实现音乐的播放、暂停、停止、上一首和下一首

二、实现界面截图

 

三、主要代码

1、开始，暂停，停止，上一首，下一首

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public void onClick(View v) {
switch (v.getId()){
case R.id.Play:
if(!mediaPlayer.isPlaying()){
mediaPlayer.start();//开始播放
}
break;
case R.id.Pause:
if(mediaPlayer.isPlaying()){
mediaPlayer.pause();//暂停播放
}
break;
case R.id.Stop:
if(mediaPlayer.isPlaying()){
mediaPlayer.reset();//停止播放
initMediaPlayer();
}
break;
case R.id.last:
Cut_song(--position); //上一曲
break;
case R.id.next:
Cut_song(++position);//下一曲
break;
default:
break;
}
}

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2、切歌

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private void Cut_song(int Position) {
//切歌
if (position < 0) {
position = Position = list.size() - 1;
} else if (position > list.size() - 1) {
position = Position = 0;
}
if (mediaPlayer == null) {
mediaPlayer = new MediaPlayer();
}
try {
mediaPlayer.reset();
mediaPlayer.setDataSource(list.get(position).path);
mediaPlayer.prepare();
mediaPlayer.start();
} catch (IOException e) {
e.printStackTrace();
}
}

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3、从sd卡中搜索到音乐后，输出音乐信息

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if (cursor != null) {
    while (cursor.moveToNext()) {
        main4 song = new main4();
        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);
        }
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4、歌曲选择列表中第一首歌

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private void initMediaPlayer() {
try {
mediaPlayer.setDataSource(list.get(0).path);
mediaPlayer.prepare();//让mediaPlayer进入准备状态
} catch (Exception e) {
e.printStackTrace();
}
}

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3.代码链接：https://coding.net/u/haihai250/p/music/git

4.APK链接：https://coding.net/u/haihai250/p/music/git/blob/master/app-release.apk

5.视频链接：https://v.youku.com/v_show/id_XMzk5Njc3MDg2MA==.html?x&sharefrom=android&sharekey=ea5d0a11af1d5da61e9f84b4d4c9e9140