学步园

当我们的Activity继承了TabActivity,在该类中重写onKeyDown是监听不到返回键的,

具体解决方法如下:

重写dispatchKeyEvent

	/**
	 * 退出
	 */
	@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);
	}

---------------------------------------------------------------后续2012-8-23-----------------------------------------

如果仅仅是监听某个Activity的后退键,只需要覆写该方法即可.

	@Override
	public void onBackPressed() {
		super.onBackPressed();
	}

我们可以看看super.onBackPressed()方法默认的实现:

    /**
     * Called when the activity has detected the user's press of the back
     * key.  The default implementation simply finishes the current activity,
     * but you can override this to do whatever you want.
     */
    public void onBackPressed() {
        finish();
    }

如果想屏蔽后退键只需要把super.onBackPressed()方法注释即可

但是该方法不适用于TabActivity.