android中继承TableActivity后onKeyDown事件失效

解决方法

 重写dispatchKeyEvent

@Override

public boolean dispatchKeyEvent(KeyEvent event) {
if (event.getKeyCode() == KeyEvent.KEYCODE_BACK
&& event.getAction() == KeyEvent.ACTION_DOWN
&& event.getRepeatCount() == 0) {
//具体的操作代码

}
return super.dispatchKeyEvent(event);
}