Question

我正在制作一个声卡应用程序。我有一个填充listView的声音描述的字符串列表。我的onItemClick接受一个switch语句，它从列表中为每个声音分配它的字符串描述。单击列表项时声音有效，但经过这么多次点击后，所有声音都会停止。 switch语句在我的ItemOnClick中显示如下：

switch (soundName){
    case "magic whoosh":
        mediaPlayer = MediaPlayer.create(context, R.raw.magic_whoosh);
        mediaPlayer.start();
        break;
   case "magic poof":
        mediaPlayer = MediaPlayer.create(context, R.raw.magic_poof);
        mediaPlayer.start();
        break;
}

Answer 1

根据要求提供可能的答案;

//declare instance variable
static MediaPlayer mediaPlayer;

//handle listview on item click
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                   if(mediaPlayer==null){
                      mediaPlayer=new MediaPlayer();
                      try{
                         mediaPlayer.setDataSource(//datasource based on position);
                         mediaPlayer.prepare(); //this uses  the same UI thread
                         mediaPlayer.start();
                      }catch(Throwable e){
                         //handle possible errors
                      }
                   }else{
                      if(mediaPlayer.isPlaying())mediaPlayer.stop();
                      mediaPlayer.reset();
                      try{
                         mediaPlayer.setDataSource(//datasource based on position);
                         mediaPlayer.prepare(); //this uses  the same UI thread
                         mediaPlayer.start();
                      }catch(Throwable e){
                         //handle possible errors
                      }
                   }   
                }
});

listView的每个项目播放不同的（短）媒体文件。经过这么多片段，我听不到声音

1 个答案: