{
int keyStates = getKeyStates();
if ((keyStates & LEFT_PRESSED) != 0)
mTank.turn(-1);
else if ((keyStates & RIGHT_PRESSED) != 0)
mTank.turn(1);
else if ((keyStates & UP_PRESSED) != 0)
mTank.forward(2);
else if ((keyStates & DOWN_PRESSED) != 0)
mTank.forward(-2);
}

private void render(Graphics g)
{
int w = getWidth();
int h = getHeight();

g.setColor(0xffffff);
g.fillRect(0, 0, w, h);

int x = (w - 160) / 2;
int y = (h - 160) / 2;

mLayerManager.paint(g, x, y);

g.setColor(0x000000);
g.drawRect(x, y, 160, 160);

flushGraphics();
}

public void stop()
{
mTrucking = false;
}
}

这里给出源程序的下载代码，供大家学习参考。