Android Open Source - openPDS-HelloWorld Web View Fragment

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License

The source code is released under:

MIT License

Java Source Code

package edu.mit.media.hellopds;
//w  w  w . j  a  v  a 2s.c  o  m
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Bitmap;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.view.ViewPager;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.webkit.WebViewClient;
import android.widget.FrameLayout;

@SuppressLint("ValidFragment")
public class WebViewFragment extends Fragment {

  private static final String TAG = "LivingLabActivity";
  private String mUrl;
  private FrameLayout mView;
  private WebView mWebView;
  private View mLoadingStatusView;
  private String mTitle;
  private Activity mActivity;
  private ViewPager mViewPager;
  private WebViewFragmentJavascriptInterface mJavascriptInterface;
  private WebViewFragmentClient mWebViewClient;
  
  public static WebViewFragment Create(String url, String title, Activity activity, ViewPager viewPager) {
    return Create(url, title, activity, viewPager, new WebViewFragmentJavascriptInterface(viewPager, activity));
  }
  
  public static WebViewFragment Create(String url, String title, Activity activity, ViewPager viewPager, WebViewFragmentJavascriptInterface jsInterface) {
    WebViewFragment fragment = new WebViewFragment(url, title, activity, viewPager);
    fragment.mJavascriptInterface = jsInterface;
    fragment.mWebViewClient = new WebViewFragmentClient(activity, fragment);
    
    return fragment;
  }
  
  public WebViewFragmentClient getWebViewClient() {
    return mWebViewClient;
  }

  public void setWebViewClient(WebViewFragmentClient webViewClient) {
    mWebViewClient = webViewClient;
  }

  public static WebViewFragment Create(String url, String title, Activity activity, ViewPager viewPager, WebViewFragmentJavascriptInterface jsInterface, WebViewFragmentClient webViewClient) {
    WebViewFragment fragment = new WebViewFragment(url, title, activity, viewPager);
    fragment.mJavascriptInterface = jsInterface;
    webViewClient.setContext(activity);
    webViewClient.setWebViewFragment(fragment);
    fragment.mWebViewClient = webViewClient;
    
    return fragment;
  }
  
  public WebViewFragment() {
    super();
    mUrl = mTitle = "";
    mWebViewClient = new WebViewFragmentClient();
    mWebViewClient.setWebViewFragment(this);
  }
  
  protected WebViewFragment(String url, String title, Activity activity, ViewPager viewPager) {
    mUrl = url;
    mTitle = title;
    mActivity = activity;
    mViewPager = viewPager;
  }

  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
      Bundle savedInstanceState) {
    mView = (FrameLayout) inflater.inflate(R.layout.webview_fragment_layout, container, false); 
    mLoadingStatusView = mView.findViewById(R.id.loading_status);
  
    // NOTE: code below for programmatically adding the webview may be necessary to avoid a 
    // memory leak related to using the main activity as the context when constructing a webview
    // This is what occurs when the webview is specified declaratively in the layout xml
    
    mWebView = (WebView) mView.findViewById(R.id.fragment_webview);
    //mWebView.setVisibility(View.VISIBLE);
    //mWebView.setLayoutParams(new FrameLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.getSettings().setCacheMode(WebSettings.LOAD_NO_CACHE);
    //mWebViewClient.setWebView(mWebView);
    //mWebViewClient.setErrorString("Problem contacting server");
    //mWebViewClient.setLoadingStatusView(mLoadingStatusView);
    mWebView.setWebViewClient(mWebViewClient);
          
    mWebView.addJavascriptInterface(mJavascriptInterface, "android");
    
    if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
        //WebView.setWebContentsDebuggingEnabled(true);
    }
  
    if (savedInstanceState != null) {
      mWebView.restoreState(savedInstanceState);
    } else {
      mWebView.loadUrl(mUrl);
    }    
    
    //mView.addView(mWebView);
    return mView;
  }  
  
  public String getTitle() {
    return mTitle;
  }
  
  public void showLoadingScreen() {
    mWebView.setVisibility(View.GONE);
    mLoadingStatusView.setVisibility(View.VISIBLE);
  }
  
  public void hideLoadingScreen() {
    mWebView.setVisibility(View.VISIBLE);
    mLoadingStatusView.setVisibility(View.GONE);
  }
  
  public void showErrorScreen() {
    mWebView.loadData(getString(R.string.problem_contacting_server), "text/html", "UTF-8");
  }
}

Java Source Code List

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