我在eclipse上创建一个Android应用程序。当我开始我的活动时,我已经让它在后台播放音乐(song1.wav)。但是,如何更改它以便以随机顺序播放歌曲列表?
这是我的代码:
public class BCTR extends Activity {
protected MediaPlayer song1MediaPlayer;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
this.requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_bctr);
Button homebutton = (Button) findViewById(R.id.homebtn);
final AudioManager audioManager = (AudioManager)getSystemService(Context.AUDIO_SERVICE);
int maxVolume = audioManager.getStreamMaxVolume(AudioManager.STREAM_MUSIC);
int curVolume = audioManager.getStreamVolume(AudioManager.STREAM_MUSIC);
SeekBar volControl = (SeekBar)findViewById(R.id.volbar);
volControl.setMax(maxVolume);
volControl.setProgress(curVolume);
volControl.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar arg0) {
}
@Override
public void onStartTrackingTouch(SeekBar arg0) {
}
@Override
public void onProgressChanged(SeekBar arg0, int arg1, boolean arg2) {
audioManager.setStreamVolume(AudioManager.STREAM_MUSIC, arg1, 0);
}
});
song1MediaPlayer = MediaPlayer.create(BCTR.this, R.raw.song1);
song1MediaPlayer.start();
homebutton.setOnClickListener(new OnClickListener()
{
public void onClick(View v)
{
song1MediaPlayer.stop();
Intent intent = new Intent(BCTR.this, MainActivity.class);
startActivity(intent);
}
});
// TODO Auto-generated method stub
}
}
所以基本上我在我的原始文件夹中有song1 - song10,并且我希望它们在活动开始时以随机顺序播放。
答案 0 :(得分:0)
假设您有一个名为AbstractList<Integer>
的{{1}}变量,其中包含0,1,2,...,n - 1作为其值。现在,让我们有一个方法负责从indexes
变量中随机获取index和index元素:
indexes
您需要构建包含public int getRandomNumber(numberOfElements) {
java.util.Random rnd = new java.util.Random();
return rnd.nextInt(numberOfElements);
}
的{{1}}(例如,您可以使用AbstractList<Integer>
类进行实例化)然后
indexes