无法在Webview应用程序中获取相机 . 它最近从画廊展示，但没有相机选项

我在 WebView 渲染一个网站，我的问题是我在尝试上传 Profiles 图片或任何图片时无法访问相机（相机选项不存在，而在浏览器中打开时，一切都按照预期工作） . 我是android的新手所以我在使用 WebView 时无法弄清楚如何正确地完成它，已经通过教程，其中有一个非常简单的方法 .

我尝试了很多东西，但没有任何效果 . 需要帮忙！

这是我的 MainActivity 代码：

public class MainActivity extends Activity implements 
    AdvancedWebView.Listener, View.OnClickListener {
    private AdvancedWebView mWebView;
    private WebSettings webSettings;

    private DhanVapasiWebChromeClient dhanVapasiWebChromeClient;
    private RelativeLayout childLayout;
    private RelativeLayout browserLayout;
    private Button mainCloseButton;
    private TextView titleText;
    private Context mContext;
    private Activity mActivity;
    protected final Map<String, String> mHttpHeaders = new 
    HashMap<String, String>();

    private static final int FILECHOOSER_RESULTCODE   = 2888;
    private ValueCallback<Uri> mUploadMessage;
    private Uri mCapturedImageURI = null;


    private PermissionRequest mPermissionRequest;

    private static final int REQUEST_CAMERA_PERMISSION = 1;
    private static final String[] PERM_CAMERA =
        {Manifest.permission.CAMERA};
    // declarations ends here !

    @Override
    protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    mContext = getApplicationContext();
    mActivity = MainActivity.this;
    setUpWidgets();

    if(isChildOpen()){
        dhanVapasiWebChromeClient.closeChild();
        mWebView.reload();
    }
    mWebView = (AdvancedWebView) findViewById(R.id.webview);
    mWebView.setListener(this, this);

    mWebView.setWebViewClient(new WebViewClient(){
        @Override
        public boolean shouldOverrideUrlLoading(WebView view, String 
        url){
            //Override those URLs you need and return true.
            //Return false if you don't need to override that URL.
            Log.d("should_override", "THIS IS URL:"+url);
            if (url.endsWith(".mp4")) {
                Intent intent = new Intent(Intent.ACTION_VIEW);
                intent.setDataAndType(Uri.parse(url), "video/*");
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                view.getContext().startActivity(intent);
                // If we return true, onPageStarted, onPageFinished 
                won't be called.
                return true;
            } else if (url.startsWith("whatsapp:")) {
                Intent intent = new Intent(Intent.ACTION_VIEW, 
                Uri.parse(url));
                intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
                view.getContext().startActivity(intent);
                return true; // If we return true, onPageStarted, 
                onPageFinished won't be called.
            }
            else if(url.startsWith("mailto:")){
                handleMailToLink(url, mWebView);

            }
            else{
                view.loadUrl(url,mHttpHeaders);
            }

            return true;
        }



           });



     webSettings = setupWebView(mWebView.getSettings(), this);
     mWebView.addHttpHeader("X-device","AndroidApp");
     mHttpHeaders.put("X-device", "AndroidApp");


     dhanVapasiWebChromeClient = new 
     DhanVapasiWebChromeClient(MainActivity.this, childLayout, 
     browserLayout, titleText, mWebView);
     mWebView.setWebChromeClient(dhanVapasiWebChromeClient);








     mWebView.loadUrl(WEBAPP_URL);
     }


     // handles initial setup of webview  first time initialization , 
     javascript enable bla bla
      public WebSettings setupWebView(WebSettings webSettings, 
      Activity activity) {

      webSettings.setJavaScriptEnabled(true);
      webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
      webSettings.setGeolocationEnabled(false);  // normally set true
      webSettings.setDomStorageEnabled(true);
      webSettings.setPluginState(WebSettings.PluginState.ON);


      webSettings.setSupportMultipleWindows(true);

      // accept cookies keep it in  with cookiemanager
      CookieManager.getInstance().setAcceptCookie(true);
      webSettings.setGeolocationEnabled(true);

      return webSettings;
     }