android 返回键两次退出 -电脑资料

    返回键两次退出

<code class="hljs" cs="">private long exitTime = 0;    @Override    public boolean onKeyDown(int keyCode, KeyEvent event) {        if(keyCode == KeyEvent.KEYCODE_BACK && event.getAction() == KeyEvent.ACTION_DOWN){               if((System.currentTimeMillis()-exitTime) > 2000){                  Toast.makeText(getApplicationContext(), 再按一次退出程序, Toast.LENGTH_SHORT).show();                                                exitTime = System.currentTimeMillis();               } else {                finish();                android.os.Process.killProcess(android.os.Process.myPid()); //获取PID                 System.exit(0);            }            return true;           }        return super.onKeyDown(keyCode, event);    }</code>