Android 阻隔返回键
//阻隔 返回键 @Override public boolean onKeyDown(int keyCode, KeyEvent event) { if (keyCode == KeyEvent.KEYCODE_BACK && event.getRepeatCount() == 0) { exitBy2Click();// 双击退出 return true; } return super.onKeyDown(keyCode, event); //true -- 事件传递机制:false不拦截、true拦截 }