Android 4.0音乐问题

在做monkey test时出现比较高概率的死机现象，分析认为是音乐播放器出现死循环，查看代码后发现为原生设计。
 
   代码路径：src/com/android/music/MediaPlaybackService.java

   死循环发生位置为1634行，诱因为mPlayList[i] == id，mPlayerList[i]没有发生变化。根本原因在于方法removeTracksInternal(int first, int last)

   场景模拟，假设first=7，last = 7，mPlayListen = 8, mPlayPos = 4,那么当代码走到1596行时，gotonext = false, num = 0,导致1595行循环不会执行，即mPlayList不会发生变化

   解决方案在1594行与1595行之间添加代码
   if（num == 0）{
    mPlayList[last] = 0;
   }


1631     public int removeTrack(long id) {
1632         int numremoved = 0;
1633         synchronized (this) {
1634             for (int i = 0; i < mPlayListLen; i++) {
1635                 if (mPlayList[i] == id) {
1636                     numremoved += removeTracksInternal(i, i);
1637                     i--;
1638                 }
1639             }
1640         }
1641         if (numremoved > 0) {
1642             notifyChange(QUEUE_CHANGED);
1643         }
1644         return numremoved;
1645     }

1581     private int removeTracksInternal(int first, int last) {
1582         synchronized (this) {
1583             if (last < first) return 0;
1584             if (first < 0) first = 0;
1585             if (last >= mPlayListLen) last = mPlayListLen - 1;
1586
1587             boolean gotonext = false;
1588             if (first <= mPlayPos && mPlayPos <= last) {
1589                 mPlayPos = first;
1590                 gotonext = true;
1591             } else if (mPlayPos > last) {
1592                 mPlayPos -= (last - first + 1);
1593             }
1594             int num = mPlayListLen - last - 1;
1595             for (int i = 0; i < num; i++) {
1596                 mPlayList[first + i] = mPlayList[last + 1 + i];
1597             }
1598             mPlayListLen -= last - first + 1;
1599
1600             if (gotonext) {
1601                 if (mPlayListLen == 0) {
1602                     stop(true);
1603                     mPlayPos = -1;
1604                     if (mCursor != null) {
1605                         mCursor.close();
1606                         mCursor = null;
1607                     }
1608                 } else {
1609                     if (mPlayPos >= mPlayListLen) {
1610                         mPlayPos = 0;
1611                     }
1612                     boolean wasPlaying = isPlaying();
1613                     stop(false);
1614                     openCurrentAndNext();
1615                     if (wasPlaying) {
1616                         play();
1617                     }
1618                 }
1619                 notifyChange(META_CHANGED);
1620             }
1621             return last - first + 1;
1622         }
1623     }