WebpageFragment.java

package com.andrewpham.android.khanacademy_learnanything.controllers;

import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.NavUtils;
import android.view.LayoutInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.ProgressBar;

import com.andrewpham.android.khanacademy_learnanything.R;
import com.andrewpham.android.khanacademy_learnanything.oauth.OAuthClient;

import java.net.MalformedURLException;
import java.net.URL;
import java.util.HashMap;

/**
 * Created by andrewpham on 9/27/14.
 */
public class WebpageFragment extends Fragment {

    private static final String FORWARDING_URL = "http://www.khanacademy.org/api/auth/default_callback";

    private String mUrl;
    private WebView mWebView;

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

        setRetainInstance(true);

        mUrl = getActivity().getIntent().getData().toString();

        setHasOptionsMenu(true);
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup parent,
                             Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_webpage, parent, false);

        if (NavUtils.getParentActivityName(getActivity()) != null) {
            getActivity().getActionBar().setDisplayHomeAsUpEnabled(true);
        }

        final ProgressBar progressBar = (ProgressBar) v.findViewById(R.id.progressBar);
        progressBar.setMax(100);

        mWebView = (WebView) v.findViewById(R.id.webView);

        mWebView.getSettings().setLoadWithOverviewMode(true);
        mWebView.getSettings().setUseWideViewPort(true);

        mWebView.getSettings().setJavaScriptEnabled(true);

        mWebView.setWebViewClient(new WebViewClient() {

            public boolean shouldOverrideUrlLoading(WebView view, String url) {
                if (url.startsWith(FORWARDING_URL)) {
                    try {
                        HashMap<String, String> queryMap = getQueryMap(new URL(url).getQuery());
                        view.loadUrl(OAuthClient.authenticate(queryMap.get("oauth_token")));
                    } catch (MalformedURLException e) {
                        e.printStackTrace();
                    } catch (Exception e) {
                        e.printStackTrace();
                    }
                } else {
                    view.loadUrl(url);
                }
                return true;
            }
        });

        mWebView.setWebChromeClient(new WebChromeClient() {
            public void onProgressChanged(WebView webView, int progress) {
                if (progress == 100) {
                    progressBar.setVisibility(View.INVISIBLE);
                } else {
                    progressBar.setVisibility(View.VISIBLE);
                    progressBar.setProgress(progress);
                }
            }
        });

        mWebView.loadUrl(mUrl);

        return v;
    }

    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case android.R.id.home:
                if (NavUtils.getParentActivityName(getActivity()) != null) {
                    NavUtils.navigateUpFromSameTask(getActivity());
                }
                return true;
            default:
                return super.onOptionsItemSelected(item);
        }
    }

    public static HashMap<String, String> getQueryMap(String query) {
        HashMap<String, String> queryMap = new HashMap<String, String>();
        for (String param : query.split("&")) {
            queryMap.put(param.split("=")[0], param.split("=")[1]);
        }
        return queryMap;
    }

}