关于cocos2d-x 调用android Intent分享的问题

Cocos2d-x
#1

cocos2d-x 部分：

    //获取屏幕尺寸，初始化一个空的渲染纹理对象 
    auto renderTexture = RenderTexture::create(visibleSize.width, visibleSize.height, Texture2D::PixelFormat::RGBA8888);
    //清空并开始获取 
    renderTexture->beginWithClear(0.0f, 0.0f, 0.0f, 0.0f);
    //遍历场景节点对象，填充纹理到RenderTexture中 
    Director::getInstance()->getRunningScene()->visit();
    //结束获取 
    renderTexture->end();
    //保存文件 
    renderTexture->saveToFile(fileName, format);
    auto fullPath = FileUtils::getInstance()->getWritablePath() + fileName;
    auto scheduleCallback = &, fullPath, screenShotCallback](float dt){
        screenShotCallback(fullPath.c_str());
    };
    auto _schedule = Director::getInstance()->getRunningScene()->getScheduler();
    _schedule->schedule(scheduleCallback, this, 0.0f, 0, 0.0f, false, "screenshot");
```


android部分：

    public static void share(final String subject, final String context,
            final String fullPath) {
        _appActiviy.runOnUiThread(new Runnable() {
            @Override
            public void run() {
                File file = new File(fullPath);
                Intent shareIntent = new Intent();
                shareIntent.setAction(Intent.ACTION_SEND);
                shareIntent.setType("image/*");
                shareIntent.putExtra(Intent.EXTRA_STREAM, Uri.fromFile(file));
                shareIntent.putExtra(Intent.EXTRA_SUBJECT, subject);
                shareIntent.putExtra(Intent.EXTRA_TEXT, context);
                shareIntent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                _appActiviy.startActivity(Intent.createChooser(shareIntent,
                        subject));
            }
        });
    }
```


问题是，现在文字可以分享，但是图片分享不了，大神们知道怎么回事吗？