cocos2d-x 3.2 实现 Andorid “请再按一次退出游戏”，双击返回键退出游戏

首先将cocos2d/cocos/platform/android/src/org/cocos2dx/lib下的Cocos2dxGLSurfaceView.java里的

   public boolean onKeyDown(final int pKeyCode, final KeyEvent pKeyEvent) 函数修改一下，改成如下样式，让KeyEvent.KEYCODE_BACK时直接返回false，防止其阻断我们对返回键的监听。

 public boolean onKeyDown(final int pKeyCode, final KeyEvent pKeyEvent) {
     switch (pKeyCode) {
         case KeyEvent.KEYCODE_BACK:
             return false;
             // Cocos2dxVideoHelper.mVideoHandler.sendEmptyMessage(Cocos2dxVideoHelper.KeyEventBack);
         case KeyEvent.KEYCODE_MENU:
         case KeyEvent.KEYCODE_DPAD_LEFT:
         case KeyEvent.KEYCODE_DPAD_RIGHT:
         case KeyEvent.KEYCODE_DPAD_UP:
         case KeyEvent.KEYCODE_DPAD_DOWN:
         case KeyEvent.KEYCODE_ENTER:
         case KeyEvent.KEYCODE_MEDIA_PLAY_PAUSE:
         case KeyEvent.KEYCODE_DPAD_CENTER:
             this.queueEvent(new Runnable() {
                 @Override
                 public void run() {
                     Cocos2dxGLSurfaceView.this.mCocos2dxRenderer.handleKeyDown(pKeyCode);
                 }
             });
             return true;
         default:
             return super.onKeyDown(pKeyCode, pKeyEvent);
     }
 }

之后在跟根目录的src/org.cocos2dx.cpp/AppActivity.java里面的主函数里添加如下代码即可

 private long mkeyTime = 0;
 public boolean onKeyDown(int keyCode, KeyEvent event) {
     //二次返回退出
     if (keyCode == KeyEvent.KEYCODE_BACK) {
         if ((System.currentTimeMillis() - mkeyTime) > 2000) {
             mkeyTime = System.currentTimeMillis();
             Toast.makeText(this, "请再按一次退出游戏", Toast.LENGTH_LONG).show();
         } else {
             finish();
             System.exit(0);
         }
         return false;
     }
     return super.onKeyDown(keyCode, event);
 }