嗨，我是 android 新手，我正在通过示例学习。我正在尝试创建一个活动，其中包含我的原始文件夹中所有歌曲的列表视图，底部有媒体播放器控件。到目前为止，我一切正常，但我似乎无法SeekBar停止强制关闭。
这是代码：
public class music extends ListActivity implements Runnable {
private ArrayList<sound> mSounds = null;
private soundadapter mAdapter = null;
private ImageButton playbtn;
private SeekBar seekbar;
private int total;
private MediaPlayer mp = null;
private TextView selelctedFile = null;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.music);
selelctedFile = (TextView) findViewById(R.id.selectedfile);
seekbar = (SeekBar) findViewById(R.id.seekbar);
seekbar.setProgress(0);
// create a simple list
mSounds = new ArrayList<sound>();
sound s = new sound();
s.setDescription("Rudolph The Red Nosed Reindeer");
s.setSoundResourceId(R.raw.rudolphtherednosereindeer);
mSounds.add(s);
s = new sound();
s.setDescription("Battery");
s.setSoundResourceId(R.raw.battery);
mSounds.add(s);
mAdapter = new soundadapter(this, R.layout.listitem, mSounds);
setListAdapter(mAdapter);
playbtn = (ImageButton) findViewById(R.id.play);
playbtn.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
try {
if (mp.isPlaying()) {
mp.pause();
playbtn.setImageResource(android.R.drawable.ic_media_play);
} else {
mp.start();
playbtn.setImageResource(android.R.drawable.ic_media_pause);
}
} catch (Exception e) {
e.printStackTrace();
// TODO: handle exception
}
}
});
}
@Override
public void onListItemClick(ListView parent, View v, int position, long id) {
sound s = (sound) mSounds.get(position);
if (mp != null) {
mp.reset();
mp.release();
}
mp = MediaPlayer.create(this, s.getSoundResourceId());
selelctedFile.setText(s.getDescription());
playbtn.setImageResource(android.R.drawable.ic_media_pause);
mp.start();
total = mp.getDuration();
seekbar.setMax(total);
seekbar.setOnSeekBarChangeListener(new SeekBar.OnSeekBarChangeListener() {
@Override
public void onStopTrackingTouch(SeekBar seekbar) {
// TODO Auto-generated method stub
}
@Override
public void onStartTrackingTouch(SeekBar seekbar) {
// TODO Auto-generated method stub
}
@Override
public void onProgressChanged(SeekBar seekBar, int progress,
boolean fromUser) {
// TODO Auto-generated method stub
if (fromUser) {
mp.seekTo(progress);
seekBar.setProgress(progress);
}
}
});
Thread currentThread = new Thread(this);
currentThread.start();
}
@Override
public void run() {
// TODO Auto-generated method stub
try {
while (mp != null) {
int currentPosition = mp.getCurrentPosition();
Message msg = new Message();
msg.what = currentPosition;
threadHandler.sendMessage(msg);
Thread.sleep(100);
}
}
catch (InterruptedException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} finally {
}
}
private Handler threadHandler = new Handler() {
public void handleMessage(Message msg) {
// super.handleMessage(msg);
// txt.setText(Integer.toString(msg.what));
seekbar.setProgress(msg.what);
}
};
@Override
protected void onPause() {
// TODO Auto-generated method stub
mp.stop();
mp.release();
mp = null;
}
@Override
protected void onDestroy() {
// TODO Auto-generated method stub
if(mp != null) {
mp.stop();
mp.release();
mp = null;
}
}
}
这是我多次点击不同歌曲时不断出现的错误：
04-14 02:53:00.452: W/dalvikvm(27452): threadid=19: thread exiting with uncaught exception (group=0x40018560)
04-14 02:53:00.466: E/AndroidRuntime(27452): FATAL EXCEPTION: Thread-22
04-14 02:53:00.466: E/AndroidRuntime(27452): java.lang.IllegalStateException
04-14 02:53:00.466: E/AndroidRuntime(27452): at android.media.MediaPlayer.getCurrentPosition(Native Method)
04-14 02:53:00.466: E/AndroidRuntime(27452): at net.cybercore.collapsingfromwithin.music.run(music.java:145)
04-14 02:53:00.466: E/AndroidRuntime(27452): at java.lang.Thread.run(Thread.java:1019)
行错误 145 是：
int currentPosition = mp.getCurrentPosition();
我一生都无法弄清楚为什么它可以播放 3 或 4 次然后它会杀死应用程序。
任何帮助表示赞赏。我已经查看了其他几个网站的示例，包括http://www.androidhive.info/2012/03/android-building-audio-player-tutorial/和http://www.androiddevblog.net/android/playing- android中的音频
**
更新
** 我想我修好了。感谢您的帮助，我发现Thread 在 android mediaplayer 上用于 seekbar，所以我将其更改为
@Override
public void run() {
// TODO Auto-generated method stub
try {
while (mp != null) {
int currentPosition = mp.getCurrentPosition();
Message msg = new Message();
msg.what = currentPosition;
threadHandler.sendMessage(msg);
try {
Thread.sleep(100);
} catch (InterruptedException e) {
e.printStackTrace();
System.out.println("interrupt exeption" + e);
}
}
}
catch (Exception e) {
// TODO Auto-generated catch block
e.printStackTrace();
System.out.println("My exeption" + e);
}
}
我仍然收到错误，但它们并没有杀死我的应用程序。我认为这不是正确的方法，但它的工作原理。