在媒体播放器中加载多个音乐媒体

Question

它不会加载开关大小写中声明的歌曲

final ArrayList<Integer> playlist;

playlist = new ArrayList<>();
playlist.add(R.raw.honey);
playlist.add(R.raw.anger);
playlist.add(R.raw.contempt);
playlist.add(R.raw.disgust);
playlist.add(R.raw.fear);
playlist.add(R.raw.happy);
playlist.add(R.raw.sadness);
playlist.add(R.raw.surprise);

MediaPlayer mediaPlayer = null;
Button play = findViewById(R.id.play);
Button pause = findViewById(R.id.pause);
Button jumpToMainActivity = findViewById(R.id.jumpToMainActivity);
mediaPlayer = MediaPlayer.create(this,playlist.get(0));
switch (final_detected_emotion){
case "anger":
mediaPlayer.reset();
mediaPlayer.create(this,playlist.get(1));
break;
case "contempt":
mediaPlayer.reset();
mediaPlayer.create(this,playlist.get(2));
break;
case "disgust":
mediaPlayer.reset();
mediaPlayer.create(this,playlist.get(3));
break;
case "fear":
mediaPlayer.reset();
mediaPlayer.create(this,playlist.get(4));
break;
case "happy":
mediaPlayer.reset();
mediaPlayer.create(this,playlist.get(5));
break;
case "sadness":
mediaPlayer.reset();
mediaPlayer.create(this,playlist.get(6));
break;
case "surprise":
mediaPlayer.reset();
mediaPlayer.create(this,playlist.get(7));
break;
}
final MediaPlayer finalMediaPlayer = mediaPlayer;
play.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
finalMediaPlayer.start();
}
});

它只播放蜂蜜歌曲，弦(final_detected_emotion(通过更改，但歌曲没有更改。

我会删除媒体播放器对象吗

我已经制作了在检测到的情绪上播放歌曲的应用程序

Answer 1

switch (final_detected_emotion){
case "anger":
mediaPlayer = MediaPlayer.create(this,playlist.get(1));
break;
case "contempt":
mediaPlayer = MediaPlayer.create(this,playlist.get(2));
break;
case "disgust":
mediaPlayer = MediaPlayer.create(this,playlist.get(3));
break;
case "fear":
mediaPlayer = MediaPlayer.create(this,playlist.get(4));
break;
case "happy":
mediaPlayer = MediaPlayer.create(this,playlist.get(5));
break;
case "sadness":
mediaPlayer = MediaPlayer.create(this,playlist.get(6));
break;
case "surprise":
mediaPlayer = MediaPlayer.create(this,playlist.get(7));
break;
default :
mediaPlayer = MediaPlayer.create(this,playlist.get(0));
}