在android系统下开启App的沉浸模式。（在cocos2d 3.6 中实现游戏全屏/隐藏系统菜单）

网上大量资料指出在AndroidManifest中进行修改，但是我尝试之后发觉并没有效。

经过实践证明，谷歌在安卓4.4之后提出了一个Immersive Full-Screen Mode的概念(官方文档)，我们需要做的是进行和它相关的设置。
你可以在AppActivity中写一个函数

java // This snippet hides the system bars.
private void hideSystemUI() {
    // Set the IMMERSIVE flag.
    // Set the content to appear under the system bars so that the content
    // doesn't resize when the system bars hide and show.
    mDecorView.setSystemUiVisibility(
            View.SYSTEM_UI_FLAG_LAYOUT_STABLE
            | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
            | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
            | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
            | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
            | View.SYSTEM_UI_FLAG_IMMERSIVE);
}

然后在AppActivity中调用setContentView的代码之前，调用它即可。

更多细节可以参考网友提供的完整代码。
http://discuss.cocos2d-x.org/t/how-to-set-full-screen-on-android-4-4/1...

我个人要解决的问题是在cocos2d-js 3.6中实现游戏的全屏。
如果读者的情况和我一样则可以简单的用以下代码来替换掉项目中的frameworks/runtime-src/proj.android/src/org/cocos2dx/javascript/AppActivity.java

java/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2014 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
package org.cocos2dx.javascript;

import org.cocos2dx.lib.Cocos2dxActivity;
import org.cocos2dx.lib.Cocos2dxGLSurfaceView;

public class AppActivity extends Cocos2dxActivity {

    private Cocos2dxGLSurfaceView glSurfaceView;

    @Override
    public Cocos2dxGLSurfaceView onCreateView() {

        glSurfaceView = new Cocos2dxGLSurfaceView(this);

        this.hideSystemUI();

        // TestCpp should create stencil buffer
        glSurfaceView.setEGLConfigChooser(5, 6, 5, 0, 16, 8);

        return glSurfaceView;
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus)
    {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus)
        {
            this.hideSystemUI();
        }
    }

    private void hideSystemUI()
    {
        // Set the IMMERSIVE flag.
        // Set the content to appear under the system bars so that the content
        // doesn't resize when the system bars hide and show.
        glSurfaceView.setSystemUiVisibility(
                Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_LAYOUT_STABLE 
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }
}

如果是cocos2d-x 3.6项目的话，用以下代码来替换掉项目中的proj.android/src/org/cocos2dx/cpp/AppActivity.java

java/****************************************************************************
Copyright (c) 2008-2010 Ricardo Quesada
Copyright (c) 2010-2012 cocos2d-x.org
Copyright (c) 2011      Zynga Inc.
Copyright (c) 2013-2014 Chukong Technologies Inc.

http://www.cocos2d-x.org

Permission is hereby granted, free of charge, to any person obtaining a copy
of this software and associated documentation files (the "Software"), to deal
in the Software without restriction, including without limitation the rights
to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
copies of the Software, and to permit persons to whom the Software is
furnished to do so, subject to the following conditions:

The above copyright notice and this permission notice shall be included in
all copies or substantial portions of the Software.

THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
THE SOFTWARE.
****************************************************************************/
package org.cocos2dx.cpp;

import org.cocos2dx.lib.Cocos2dxActivity;
import org.cocos2dx.lib.Cocos2dxGLSurfaceView;

public class AppActivity extends Cocos2dxActivity {

    private Cocos2dxGLSurfaceView glSurfaceView;

    @Override
    public Cocos2dxGLSurfaceView onCreateView() {

        glSurfaceView = super.onCreateView();

        this.hideSystemUI();

        return glSurfaceView;
    }

    @Override
    public void onWindowFocusChanged(boolean hasFocus)
    {
        super.onWindowFocusChanged(hasFocus);
        if (hasFocus)
        {
            this.hideSystemUI();
        }
    }

    private void hideSystemUI()
    {
        // Set the IMMERSIVE flag.
        // Set the content to appear under the system bars so that the content
        // doesn't resize when the system bars hide and show.
        glSurfaceView.setSystemUiVisibility(
                Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_LAYOUT_STABLE 
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
                | Cocos2dxGLSurfaceView.SYSTEM_UI_FLAG_IMMERSIVE_STICKY);
    }
}