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【转】Android 实现“再按一次退出程序”

From:http://blog.csdn.net/ldj299/article/details/7574365

 

个人觉得当用户按下后退键时,出现"再按一次退出"的提示防止误操作比弹出一个对话框是会更人性化的。话不多说上代码:

第一种:重写onKeyDown来监听:

    long waitTime = 2000;    long touchTime = 0;        @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if(event.getAction() == KeyEvent.ACTION_DOWN && KeyEvent.KEYCODE_BACK == keyCode) {            long currentTime = System.currentTimeMillis();            if((currentTime-touchTime)>=waitTime) {                Toast.makeText(this, "再按一次退出", Toast.LENGTH_SHORT).show();                touchTime = currentTime;            }else {                finish();            }            return true;        }        return super.onKeyDown(keyCode, event);    }

 

第二种是重写onBackPressed方法直接监听返回键:

  @Override    public void onBackPressed() {//        super.onBackPressed();        long currentTime = System.currentTimeMillis();        if((currentTime - touchTime) >= waitTime) {            Toast.makeText(this, "再按一次退出", Toast.LENGTH_SHORT).show();            touchTime = currentTime;        }else {            finish();        }    }

 

【转】Android 实现“再按一次退出程序”