Program: 81488
Project: 81488
Buggy source:
/** 
 * This handles all events in which the user touches the screen. For example, the user can touch a square and drag it to a new position, or the user can touch a disk and flick it toward the target.
 */
public boolean onTouch(View v,MotionEvent event){
  float x, y;
synchronized (gameModel) {
    x=event.getX();
    y=height - event.getY();
    Log.d(TAG,"String_Node_Str" + x + "String_Node_Str"+ y+ "String_Node_Str"+ (height - y)+ "String_Node_Str"+ currState+ "String_Node_Str"+ firstX+ "String_Node_Str"+ firstY);
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
      Disk d;
      Square s;
      firstX=x;
      firstY=y;
      d=gameModel.touchingDisk(x,y);
      s=gameModel.touchingSquare(x,y);
      Log.d(TAG,"String_Node_Str" + d);
      Log.d(TAG,"String_Node_Str" + s);
      if ((d != null) && (!d.isStatic)) {
        currDisk=d;
        currDisk.vx=currDisk.vy=0;
        currDisk.weightless=true;
        currState=State.TOUCH_DISK;
        Log.d(TAG,"String_Node_Str" + d);
      }
 else       if (s != null) {
        currSquare=s;
        currState=State.TOUCH_SQUARE;
        Log.d(TAG,"String_Node_Str" + s);
      }
      return true;
    }
 else     if (event.getAction() == MotionEvent.ACTION_MOVE) {
      if (currState == State.TOUCH_DISK) {
        currDisk.move(firstX,firstY);
      }
 else       if (currState == State.TOUCH_SQUARE) {
        currSquare.move(x,y);
      }
      return true;
    }
 else     if (event.getAction() == MotionEvent.ACTION_UP) {
      if (currState == State.TOUCH_DISK) {
        currState=State.WAIT;
        float dx=x - firstX;
        float dy=y - firstY;
        currDisk.vx=dx;
        currDisk.vy=dy;
        currDisk.weightless=false;
        currDisk=null;
        return true;
      }
 else       if (currState == State.TOUCH_SQUARE) {
        currState=State.WAIT;
        currSquare=null;
        return true;
      }
    }
    return false;
  }
}

Fixed version (ground truth):
/** 
 * This handles all events in which the user touches the screen. For example, the user can touch a square and drag it to a new position, or the user can touch a disk and flick it toward the target.
 */
public boolean onTouch(View v,MotionEvent event){
  float x, y;
synchronized (gameModel) {
    x=event.getX();
    y=height - event.getY();
    Log.d(TAG,"String_Node_Str" + x + "String_Node_Str"+ y+ "String_Node_Str"+ (height - y)+ "String_Node_Str"+ currState+ "String_Node_Str"+ firstX+ "String_Node_Str"+ firstY);
    if (event.getAction() == MotionEvent.ACTION_DOWN) {
      Disk d;
      Square s;
      d=gameModel.touchingDisk(x,y);
      s=gameModel.touchingSquare(x,y);
      Log.d(TAG,"String_Node_Str" + d);
      Log.d(TAG,"String_Node_Str" + s);
      if ((d != null) && (!d.isStatic)) {
        currDisk=d;
        currDisk.vx=currDisk.vy=0;
        currDisk.weightless=true;
        currState=State.TOUCH_DISK;
        firstX=d.x;
        firstY=d.y;
        Log.d(TAG,"String_Node_Str" + d);
      }
 else       if (s != null) {
        currSquare=s;
        currState=State.TOUCH_SQUARE;
        Log.d(TAG,"String_Node_Str" + s);
      }
      return true;
    }
 else     if (event.getAction() == MotionEvent.ACTION_MOVE) {
      if (currState == State.TOUCH_DISK) {
        currDisk.move(firstX,firstY);
      }
 else       if (currState == State.TOUCH_SQUARE) {
        currSquare.move(x,y);
      }
      return true;
    }
 else     if (event.getAction() == MotionEvent.ACTION_UP) {
      if (currState == State.TOUCH_DISK) {
        currState=State.WAIT;
        float dx=x - firstX;
        float dy=y - firstY;
        currDisk.vx=dx;
        currDisk.vy=dy;
        currDisk.weightless=false;
        currDisk=null;
        return true;
      }
 else       if (currState == State.TOUCH_SQUARE) {
        currState=State.WAIT;
        currSquare=null;
        return true;
      }
    }
    return false;
  }
}