Making facebook login work with an Android Webview

I am just trying to implement the facebook login on a WebView in Android. The problem is after I click the facebook button on my HTML page and insert the username and password on Facebook dialog. The url redirect is just giving me a black page.

   @Override
public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    WebView webview = new WebView(this);        
    webview.setWebChromeClient(new WebChromeClient());  
    webview.getSettings().setPluginState(PluginState.ON);
    webview.getSettings().setJavaScriptEnabled(true); 
    webview.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
    webview.getSettings().setJavaScriptCanOpenWindowsAutomatically(true);
    webview.setWebViewClient(new WebViewClient());
    webview.loadUrl("http://peoplehunt.crowdscanner.com/hunt"); 
    setContentView(webview);

This is the Facebook regular javascript API on my HTML page and this function gets called when the facebook button is clicked.

$("#login_facebook").click(function() {

                    FB.login(function(response) {
                            //This function should be called
                            if (response.authResponse) {
                            FB.api('/me?fields=name,email,picture,id&type=large', function(response) {
                                    //console.log("email "+response.email);
                                    $("#submitHandle").hide();
                                    $("#loader").show();
                                    //console.log('Good to see you, ' + response.picture + '.');
                                    var theUsername = response.name;
                                    theUsername = theUsername.replace(/ /g, '_')+"_"+response.id+"@meetforeal.com";
                                    //console.log(theUsername);
                                    $("input[name=email]").val(encodeURIComponent(response.email));
                                    $("input[name=lastName]").val(encodeURIComponent(response.name));
                                    $("input[name=avatarImage]").val(response.picture);
                                    $("input[name=userName]").val(encodeURIComponent(theUsername));
                                    $("#msg_twitter").fadeIn("slow");
                                    $("#submitHandle").show();
                                    $("#loader").hide();
                                    $("#user").attr("action","/crowdmodule/auth/registerattendeefacebook");
                                    $("#user").submit();
                            });
                            } else {
  //console.log('User cancelled login or did not fully authorize.');
 }
}, {scope: 'email'});

ANY ideas on how to get the response back after the redirect on the Facebook dialog page? THANKS.

I had the same issue on my android application. The cause of the issue is FB login javascript opens a new page on a new window. Then it tries to close it and send some javascript auth codes back, after login success. WebView is typically "single window only" so it has no place to go back to, hence the blank screen.

Please follow flowing example from my working codes.

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#0099cc"
tools:context=".MyActivity" 
android:id="@+id/webview_frame">

<WebView
    android:id="@+id/webview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
/>

The Webview of id "webview" is the main view for my content. Below is my activity codes.

public class MyActivity extends Activity {

/* URL saved to be loaded after fb login */
private static final String target_url="http://www.example.com";
private static final String target_url_prefix="www.example.com";
private Context mContext;
private WebView mWebview;
private WebView mWebviewPop;
private FrameLayout mContainer;
private long mLastBackPressTime = 0;
private Toast mToast;

@Override
protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.activity_urimalo);
    // final View controlsView =
    // findViewById(R.id.fullscreen_content_controls);
    CookieManager cookieManager = CookieManager.getInstance(); 
    cookieManager.setAcceptCookie(true); 
    mWebview = (WebView) findViewById(R.id.webview);
    //mWebviewPop = (WebView) findViewById(R.id.webviewPop);
    mContainer = (FrameLayout) findViewById(R.id.webview_frame);
    WebSettings webSettings = mWebview.getSettings();
    webSettings.setJavaScriptEnabled(true);
    webSettings.setAppCacheEnabled(true);
    webSettings.setJavaScriptCanOpenWindowsAutomatically(true);
    webSettings.setSupportMultipleWindows(true);
    mWebview.setWebViewClient(new UriWebViewClient());
    mWebview.setWebChromeClient(new UriChromeClient());
    mWebview.loadUrl(target_url);

    mContext=this.getApplicationContext();

}


private class UriWebViewClient extends WebViewClient {
    @Override
    public boolean shouldOverrideUrlLoading(WebView view, String url) {
        String host = Uri.parse(url).getHost();
        //Log.d("shouldOverrideUrlLoading", url);
        if (host.equals(target_url_prefix)) 
        {
            // This is my web site, so do not override; let my WebView load
            // the page
            if(mWebviewPop!=null)
            {
                mWebviewPop.setVisibility(View.GONE);
                mContainer.removeView(mWebviewPop);
                mWebviewPop=null;
            }
            return false;
        }

        if(host.equals("m.facebook.com"))
        {
            return false;
        }
        // Otherwise, the link is not for a page on my site, so launch
        // another Activity that handles URLs
        Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
        startActivity(intent);
        return true;
    }

    @Override
    public void onReceivedSslError(WebView view, SslErrorHandler handler,
            SslError error) {
        Log.d("onReceivedSslError", "onReceivedSslError");
        //super.onReceivedSslError(view, handler, error);
    }
}

class UriChromeClient extends WebChromeClient {

    @Override
    public boolean onCreateWindow(WebView view, boolean isDialog,
            boolean isUserGesture, Message resultMsg) {
        mWebviewPop = new WebView(mContext);
        mWebviewPop.setVerticalScrollBarEnabled(false);
        mWebviewPop.setHorizontalScrollBarEnabled(false);
        mWebviewPop.setWebViewClient(new UriWebViewClient());
        mWebviewPop.getSettings().setJavaScriptEnabled(true);
        mWebviewPop.getSettings().setSavePassword(false);
        mWebviewPop.setLayoutParams(new FrameLayout.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT));
        mContainer.addView(mWebviewPop);
        WebView.WebViewTransport transport = (WebView.WebViewTransport) resultMsg.obj;
        transport.setWebView(mWebviewPop);
        resultMsg.sendToTarget();

        return true;
    }

    @Override
    public void onCloseWindow(WebView window) {
        Log.d("onCloseWindow", "called");
    }

}
}

The key for this issue is onCreateWindow. A new window is created and inserted to the frame layout and removed upon success. I added the removal at shouldOverrideUrlLoading.

Here is an example Android project: Github: Android_Popup_Webview_handler_example

This is an Android Studio project showing how to handle popups in Android Webview. Most open Source browsers do not support opening popups.

Popups are especially important in OAuth login used in a lot of websites (e.g., www.feedly.com). The popups in this project opened in a dialog and can be dismissed by a close button or pressing Back or if the popup window closes itself (like what happens on most login authentication flow).