setOnKeyListener之所以执行两次是因为都down和up占用了，解决方法是KeyEvent.getAction()==KeyEvent.ACTION\_DOWN或者KeyEvent.getAction()==KeyEvent.ACTION\_UP的时候让他执行return true；而且其他的操作需要获取getKeyCode()事件，不是getAction()动作； ~~~ webviewInstance.setOnKeyListener(new View.OnKeyListener() { @Override public boolean onKey(View v, int keyCode, KeyEvent event) { if (event.getAction() == KeyEvent.ACTION_DOWN) { if (webviewInstance.canGoBack()) { webviewInstance.goBack(); } else { finish(); } } return true; } }); ~~~