WebView setWebChromeClient - top ranked examples from Open Source projects

These code examples were ranked by Codota’s semantic indexing as the best open source examples for WebView setWebChromeClient method.

Code example from Github project AndroidAlliance/EdgeEffectOverride, WebViewActivity.java »

This code example shows how to use the following methods:getSettings, loadUrl, setWebChromeClient, setWebViewClient

    mWebView = ((WebView) findViewById(R.id.webview));
    initWebView(); 
  } 
 
  private void initWebView() { 
    mWebView.setWebViewClient(new WebViewClient());
    mWebView.setWebChromeClient(new WebChromeClient());
    WebSettings settings = mWebView.getSettings();
    settings.setSavePassword(true);
    settings.setSaveFormData(true);
    settings.setJavaScriptEnabled(true);
    settings.setSupportZoom(false);
    settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
    settings.setDomStorageEnabled(true);
    settings.setSupportMultipleWindows(false);
 
 
    mWebView.loadUrl("http://developer.android.com");
  }

    mWebView = ((WebView) findViewById(R.id.webview));
    initWebView(); 
  } 
 
  private void initWebView() { 
    mWebView.setWebViewClient(new WebViewClient());
    mWebView.setWebChromeClient(new WebChromeClient());
    WebSettings settings = mWebView.getSettings();
    settings.setSavePassword(true);
    settings.setSaveFormData(true);
    settings.setJavaScriptEnabled(true);
    settings.setSupportZoom(false);
    settings.setCacheMode(WebSettings.LOAD_NO_CACHE);
    settings.setDomStorageEnabled(true);
    settings.setSupportMultipleWindows(false);
 
 
    mWebView.loadUrl("http://developer.android.com");
  } 
 
  @Override 
  public void onBackPressed() { 
    if (mWebView.canGoBack())

CodeRank

Code example from Github project AOKP/frameworks_base_disabled, ReliabilityTestActivity.java »

This code example shows how to use the following methods:getSettings, setWebChromeClient, setWebViewClient

        LinearLayout contentView = new LinearLayout(this);
        contentView.setOrientation(LinearLayout.VERTICAL);
        setContentView(contentView);
        setTitle("Idle");
 
        webView = new WebView(this);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(false);
        webView.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NORMAL);
 
        webViewClient = new SimpleWebViewClient();
        chromeClient = new SimpleChromeClient();
        webView.setWebViewClient(webViewClient);
        webView.setWebChromeClient(chromeClient);
 
        contentView.addView(webView, new LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT, 0.0f));
 
        handler = new Handler() {

CodeRank

Add Tag...Class WebView Package android.webkit

Code example from Github project toggl/timer-for-android, GoogleAuthActivity.java »

This code example shows how to use the following methods:getSettings, loadUrl, setWebChromeClient, setWebViewClient

   
  @Override 
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_PROGRESS);
    webView = new WebView(this);
    setContentView(webView);
     
    cookieManager = CookieManager.getInstance();     
     
    initWebClient(); 
  } 
   
  private void initWebClient() { 
    webView.getSettings().setJavaScriptEnabled(true);
     
    webView.setWebChromeClient(new WebChromeClient() {
      public void onProgressChanged(WebView view, int progress) {
        // progress measures don't match web client progress measures 
        GoogleAuthActivity.this.setProgress(progress * 100);

   
  @Override 
  public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    requestWindowFeature(Window.FEATURE_PROGRESS);
    webView = new WebView(this);
    setContentView(webView);
     
    cookieManager = CookieManager.getInstance();     
     
    initWebClient(); 
  } 
   
  private void initWebClient() { 
    webView.getSettings().setJavaScriptEnabled(true);
     
    webView.setWebChromeClient(new WebChromeClient() {
      public void onProgressChanged(WebView view, int progress) {
        // progress measures don't match web client progress measures 
        GoogleAuthActivity.this.setProgress(progress * 100);
      } 
    }); 
    webView.setWebViewClient(new GoogleAuthWebViewClient());
     
    webView.loadUrl(AUTH_URL);
  } 
   
  private class GoogleAuthWebViewClient extends WebViewClient {
 
    @Override

CodeRank

Code example from Github project Pretz/SNesoid, HelpActivity.java »

This code example shows how to use the following methods:loadUrl, setWebChromeClient

 
	@Override 
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
 
		WebView view = new WebView(this);
		view.setWebChromeClient(new WebChromeClient() {
			public void onReceivedTitle(WebView view, String title) {
				HelpActivity.this.setTitle(title);
			} 
		}); 
		setContentView(view);
 
		view.loadUrl(getIntent().getData().toString());
	} 
}

CodeRank

Add Tag...Displaying web pages Class WebView Package android.webkit

Code example from Github project uservoice/uservoice-android-sdk, Utils.java »

This code example shows how to use the following methods:getSettings, loadUrl, setBackgroundColor, setWebChromeClient

 
	@SuppressLint("SetJavaScriptEnabled") 
	public static void displayArticle(WebView webView, Article article, Context context) {
		String styles = "iframe, img { width: 100%; }";
		if (isDarkTheme(context)) {
			webView.setBackgroundColor(Color.BLACK);
			styles += "body { background-color: #000000; color: #F6F6F6; } a { color: #0099FF; }";
		} 
		String html = String.format("<html><head><meta charset=\"utf-8\"><link rel=\"stylesheet\" type=\"text/css\" href=\"http://cdn.uservoice.com/stylesheets/vendor/typeset.css\"/><style>%s</style></head><body class=\"typeset\" style=\"font-family: sans-serif; margin: 1em\"><h3>%s</h3>%s</body></html>", styles, article.getTitle(), article.getHtml());
		webView.setWebChromeClient(new WebChromeClient());
		webView.getSettings().setJavaScriptEnabled(true);
		webView.getSettings().setPluginState(PluginState.ON);
		webView.loadUrl(String.format("data:text/html;charset=utf-8,%s", Uri.encode(html)));
	} 
 
    public static boolean isDarkTheme(Context context) {
        TypedValue tv = new TypedValue();
        float [] hsv =  new float[3];
        context.getTheme().resolveAttribute(android.R.attr.textColorPrimary, tv, true);
        Color.colorToHSV(context.getResources().getColor(tv.resourceId), hsv);

CodeRank

Add Tag...Displaying web pages Class WebView Package android.webkit

Code example from Github project tapit/TapIt-Android-SDK-Source, OldAdActivity.java »

This code example shows how to use the following methods:getSettings, loadUrl, setLayoutParams, setScrollBarStyle, setWebChromeClient

		getWindow().requestFeature(Window.FEATURE_PROGRESS);
 
		// Makes Progress bar Visible 
		getWindow().setFeatureInt(Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON);
 
		WebView webView = new WebView(this);
		webView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
				LayoutParams.FILL_PARENT, 1f));
		webView.loadUrl(getIntent().getDataString());
		webView.getSettings().setJavaScriptEnabled(true);
		webView.getSettings().setSupportZoom(true);
		webView.getSettings().setBuiltInZoomControls(true);
//		webView.getSettings().setLoadWithOverviewMode(true); // not supported by older versions of Android 
		webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
		webView.getSettings().setUseWideViewPort(true);
 
		setContentView(webView);
		 
		webView.setWebViewClient(new WebViewClient() {
			@Override

		getWindow().requestFeature(Window.FEATURE_PROGRESS);
 
		// Makes Progress bar Visible 
		getWindow().setFeatureInt(Window.FEATURE_PROGRESS, Window.PROGRESS_VISIBILITY_ON);
 
		WebView webView = new WebView(this);
		webView.setLayoutParams(new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT,
				LayoutParams.FILL_PARENT, 1f));
		webView.loadUrl(getIntent().getDataString());
		webView.getSettings().setJavaScriptEnabled(true);
		webView.getSettings().setSupportZoom(true);
		webView.getSettings().setBuiltInZoomControls(true);
//		webView.getSettings().setLoadWithOverviewMode(true); // not supported by older versions of Android 
		webView.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
		webView.getSettings().setUseWideViewPort(true);
 
		setContentView(webView);
		 
		webView.setWebViewClient(new WebViewClient() {
			@Override 
			public boolean shouldOverrideUrlLoading(WebView view, String url) {
				if (!url.toLowerCase().startsWith("http://") && !url.toLowerCase().startsWith("https://")){
					Intent intent = new Intent(Intent.ACTION_VIEW, Uri.parse(url));
					startActivity(intent);
					finish();
					return true; 
				} 
				view.loadUrl(url);
				setTitle(url);
				return false; 
			} 
 
			@Override 
			public void onPageFinished(WebView view, String url) {
				super.onPageFinished(view, url);
			} 
 
			@Override 
			public void onPageStarted(WebView view, String url, Bitmap favicon) {
				super.onPageStarted(view, url, favicon);
			} 
		}); 
 
		webView.setWebChromeClient(new WebChromeClient() {
			@Override 
			public void onProgressChanged(WebView view, int newProgress) {
				setProgress(newProgress * 100); // Make the bar disappear after
												// URL is loaded 
			}

CodeRank

Code example from Github project teamgummy/frameworks_base, PowerTestActivity.java »

This code example shows how to use the following methods:getSettings, setWebChromeClient, setWebViewClient

        LinearLayout contentView = new LinearLayout(this);
        contentView.setOrientation(LinearLayout.VERTICAL);
        setContentView(contentView);
        setTitle("Idle");
 
        webView = new WebView(this);
        webView.getSettings().setJavaScriptEnabled(true);
        webView.getSettings().setJavaScriptCanOpenWindowsAutomatically(false);
        webView.getSettings().setLayoutAlgorithm(LayoutAlgorithm.NORMAL);
 
        webViewClient = new SimpleWebViewClient();
        chromeClient = new SimpleChromeClient();
        webView.setWebViewClient(webViewClient);
        webView.setWebChromeClient(chromeClient);
 
        contentView.addView(webView, new LayoutParams(
                ViewGroup.LayoutParams.MATCH_PARENT,
                ViewGroup.LayoutParams.MATCH_PARENT, 0.0f));
 
        handler = new Handler() {

CodeRank

Add Tag...Class WebView Package android.webkit

Code example from Github project calabash/calabash-android, CalabashChromeClient.java »

This code example shows how to use the following methods:setWebChromeClient

            webView.setWebChromeClient(this);
        } else { 
            InstrumentationBackend.instrumentation.runOnMainSync(new Runnable() {
                @Override 
                public void run() { 
                    webView.setWebChromeClient(CalabashChromeClient.this);
                } 
            }); 
        } 
	} 
 
	@Override 
	public boolean onJsPrompt(WebView view, String url, String message,
			String defaultValue, JsPromptResult r) {
		if (message != null && message.startsWith("calabash:")) {
			r.confirm("CALABASH_ACK");
			System.out.println("onJsPrompt: " + message);
			String jsonResponse = message.replaceFirst("calabash:", "");
			scriptFuture.setResult(jsonResponse);			
			return true;

CodeRank

Add Tag...Class WebView Package android.webkit

Code example from Github project musart/HybridApplication, HybridAppActivity.java »

This code example shows how to use the following methods:addJavascriptInterface, getSettings, loadUrl, setLayoutParams, setWebChromeClient

 
    @Override 
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
      //mWebView = (WebView) findViewById(R.id.webView); 
		mWebView = new WebView(this);
 
		mWebView.setLayoutParams(new LinearLayout.LayoutParams(
				LayoutParams.FILL_PARENT, LayoutParams.FILL_PARENT));
		setContentView(mWebView);
		mWebView.loadUrl("file:///android_asset/www/index2.html");
		mWebView.getSettings().setJavaScriptEnabled(true);
		mWebView.addJavascriptInterface(new MyHybrid(), "MyHybrid");
		mWebView.setWebChromeClient(new WebChromeClient() {
			@Override 
			public void onConsoleMessage(String message, int lineNumber,
					String sourceID) {
				super.onConsoleMessage(message, lineNumber, sourceID);
			} 
		});

CodeRank

Add Tag...Displaying web pages Class WebView Package android.webkit

Code example from Github project zhangyongjiang/SORMA, SormaBrowser.java »

This code example shows how to use the following methods:addJavascriptInterface, getSettings, loadUrl, setScrollBarStyle, setWebChromeClient

 
    @Override 
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         
        web = new WebView(this);
        web.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        setContentView(web);
         
        web.getSettings().setJavaScriptEnabled(true);
        web.getSettings().setAllowFileAccess(true);
        WebViewJavascriptInterface javascriptInterface = new WebViewJavascriptInterface();
        web.addJavascriptInterface(javascriptInterface, "android");
        web.setWebChromeClient(new WebChromeClient());
        web.setWebViewClient(new GenericWebViewClient());
         
        Intent intent = getIntent();
        String contentProviderBaseUri = intent.getStringExtra("base_uri");
        try { 
            server = new HttpServer(6789, "/explorer");

 
    @Override 
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
         
        web = new WebView(this);
        web.setScrollBarStyle(WebView.SCROLLBARS_OUTSIDE_OVERLAY);
        setContentView(web);
         
        web.getSettings().setJavaScriptEnabled(true);
        web.getSettings().setAllowFileAccess(true);
        WebViewJavascriptInterface javascriptInterface = new WebViewJavascriptInterface();
        web.addJavascriptInterface(javascriptInterface, "android");
        web.setWebChromeClient(new WebChromeClient());
        web.setWebViewClient(new GenericWebViewClient());
         
        Intent intent = getIntent();
        String contentProviderBaseUri = intent.getStringExtra("base_uri");
        try { 
            server = new HttpServer(6789, "/explorer");
            server.registerHandler("/db", new DatabaseHandler(new AndroidContentResolver(getContentResolver()), contentProviderBaseUri));
        } 
        catch (IOException e) {
            Toast.makeText(this, "Cannot create builtin data browser. Error: " + e.getMessage(), Toast.LENGTH_LONG).show();
            finish();
            return; 
        } 
         
        String url = "http://" + javascriptInterface.getMyIpAddress() + ":6789/index.html";
        if(intent.getData() != null) {
            url = intent.getData().toString();
        } 
        Toast.makeText(this, "Loading \n" + url, Toast.LENGTH_LONG).show();
        web.loadUrl(url);
    } 
     
    @Override 
    protected void onDestroy() { 
        if(server != null) {

CodeRank

Related WebView setWebChromeClient Questions & Answers:

Video streaming in Activity

16:	//video.getSettings().setPluginState(WebSettings.PluginState.ON);
17:	//video.getSettings().setUserAgent(USER_MOBILE);
18:	video.setWebChromeClient(new WebChromeClient() {
19:	});
20:

Umitk's full answer:

I lately found out the solution. Video is streaming on Activity without any 3rd party app or Webpage.

public class VideoActivity extends Activity {

private WebView video;  

public static final int USER_MOBILE = 0;
public static final int USER_DESKTOP = 1;
protected static final String WebSettings = null;

@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_video);

video = (WebView) findViewById(R.id.videoView);
video.getSettings().setJavaScriptEnabled(true);
//video.getSettings().setPluginState(WebSettings.PluginState.ON);
//video.getSettings().setUserAgent(USER_MOBILE);
video.setWebChromeClient(new WebChromeClient() {
});

final String mimeType = "text/html";
final String encoding = "UTF-8";
String html = getHTML("0sFTC7l0okg"); //Only change this video id to change video!
video.loadDataWithBaseURL("", html, mimeType, encoding, "");

}

public String getHTML(String videoId) {


String html =
"<iframe class=\"youtube-player\" "
+ "style=\"border: 0; width: 100%; height: 95%;"
+ "padding:0px; margin:0px\" "
+ "id=\"ytplayer\" type=\"text/html\" "
+ "src=\"https://www.youtube.com/embed/" + videoId
+ "?fs=0\" frameborder=\"0\" " + "allowfullscreen autobuffer "
+ "controls onclick=\"this.play()\">\n" + "</iframe>\n";

return html;
}}

activity_video.xml:

<ScrollView 
xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:id="@+id/scroll" > 

<LinearLayout 

android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context=".VideoActivity" >

<WebView
android:id="@+id/videoView"
android:layout_width="fill_parent"
android:layout_height="319dp" />

</LinearLayout>

</ScrollView>

18:	    webView = (WebView) findViewById(R.id.webView1);
19:	
20:	    webView.setWebChromeClient(new WebChromeClient());
21:	    webView.getSettings().setPluginState(WebSettings.PluginState.ON_DEMAND);
22:	    webView.getSettings().setJavaScriptEnabled(true);

Offbeatmammal's full answer:

the following is a snippet from an application I have for Android API15 and above that plays supported video types (.mp4 is the most reliable). It can serve content from a URL or created in-line (commented out).

If, with this, the video still won't play, can you post a link to a sample here so we can check if it's compatible.

You need the following in the manifest

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

and

<application
android:hardwareAccelerated="true" 
.... />

and then the code:

package com.offbeatmammal.android.webview;

import android.app.Activity;
import android.os.Bundle;
import android.webkit.WebChromeClient;
import android.webkit.WebSettings;
import android.webkit.WebView;
import android.widget.RelativeLayout;

public class WebViewActivity extends Activity {

private WebView webView;

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.webview);

    webView = (WebView) findViewById(R.id.webView1);

    webView.setWebChromeClient(new WebChromeClient());
    webView.getSettings().setPluginState(WebSettings.PluginState.ON_DEMAND);
    webView.getSettings().setJavaScriptEnabled(true);

    // load the customURL with the URL of the page you want to display
    // String pageURL = "http://url/page.html";
    // webView.loadUrl(pageURL);

    String customHtml = "<html><head><title>Sample</title></head><body><video controls><source src='http://www.broken-links.com/tests/media/BigBuck.m4v'></video></body></html>";
    webView.loadData(customHtml, "text/html", "UTF-8");
}
}

19:	        webView.loadDataWithBaseURL("", new String(rowData.getResource().getData()), "text/html", "UTF-8", "about:blank");
20:	
21:	        webView.setWebChromeClient(new WebChromeClient() {
22:	            @Override
23:	            public void onProgressChanged(WebView view, int newProgress) {

Biraj Zalavadia's full answer:

Try this Tested working demo.

public class URLActivity extends Activity {

    private ProgressDialog progress;

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_webview);

        WebView webView = (WebView) findViewById(R.id.webView);
        webView.setInitialScale(0);
        webView.setWebViewClient(new WebViewClient());

        WebSettings settings = webView.getSettings();
        settings.setJavaScriptEnabled(true);
        settings.setLoadsImagesAutomatically(true);

        webView.loadDataWithBaseURL("", new String(rowData.getResource().getData()), "text/html", "UTF-8", "about:blank");

        webView.setWebChromeClient(new WebChromeClient() {
            @Override
            public void onProgressChanged(WebView view, int newProgress) {
                super.onProgressChanged(view, newProgress);
                if (newProgress > 0) {
                    showProgressDialog("Please Wait");
                }
                if (newProgress >= 100) {
                    hideProgressDialog();

                    // data load successfully. you can go further.
                }
            }
        });

    }

    public void showProgressDialog(final String msg) {

        runOnUiThread(new Runnable() {
            public void run() {
                if (progress == null || !progress.isShowing()) {
                    progress = ProgressDialog.show(URLActivity.this, "", msg);
                }
            }
        });
    }

    public void hideProgressDialog() {
        runOnUiThread(new Runnable() {

            @Override
            public void run() {
                try {
                    if (progress.isShowing())
                        progress.dismiss();
                } catch (Throwable e) {

                }
            }
        });
    }

}

15:	        super.onCreate(savedInstanceState);
16:	        webView = new WebView(this);
17:	        webView.setWebChromeClient(new WebChromeClient());
18:	        webView.setWebViewClient(new WebViewClient());
19:	        String html = "<video width=\"320\" height=\"240\" controls>" +

ADDruid's full answer:

After struggling for over a day on something similar, I have found that you can crash the MediaPlayer inside a WebView by sending the WebView to a page with a HTML5 video tag with a bad video url. The example below is a main activity with a valid video tag. If you press play, the MediaPlayer will take over and start running forever... BUT when you click back or home and leave the app, the onPause() is triggered and the WebView is redirected to a page with a bad video url and told to autoplay. Attempting to play crashes the MediaPlayer and voila! The MediaPlayer is no more.

package com.test.webviewtest;

import android.app.Activity;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.webkit.WebChromeClient;
import android.webkit.WebView;
import android.webkit.WebViewClient;

public class MainActivity extends Activity {
    WebView webView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        webView = new WebView(this);
        webView.setWebChromeClient(new WebChromeClient());
        webView.setWebViewClient(new WebViewClient());
        String html = "<video width=\"320\" height=\"240\" controls>" +
                "<source src=\"http://www.w3schools.com/html/movie.mp4\" " +
                "type=\"video/mp4\"></video>";
        webView.loadData(html, "text/html", null);
        setContentView(webView);
    }

    @Override
    protected void onPause(){
        super.onPause();
        // attempt to kill the MediaPlayer here...
        webView.getSettings().setJavaScriptEnabled(true);
        webView.setWebViewClient(new WebViewClient(){
            @Override
            public void onPageStarted(WebView view, String url, Bitmap favicon){
                String js = "javascript:document.getElementsByTagName('video')[0].play();";
                webView.loadUrl(js);
            }
        });
        String html = "<video width=\"320\" height=\"240\" controls>" +
                "<source src=\"http://www.w3schools.com/html/" +
                "NOT_A_MOVIE.mp4" +
                "\" type=\"video/mp4\"></video>";
        webView.loadData(html, "text/html", null);
    }
}

Note the logs:

02-26 13:19:13.010    220-25370/? V/MediaPlayerService﹕ [607] notify (0x43a3aeb8, 100, 1, -1004)
02-26 13:19:13.010  25262-25274/com.test.webviewtest V/MediaPlayer﹕ message received msg=100, ext1=1, ext2=-1004
02-26 13:19:13.010  25262-25274/com.test.webviewtest E/MediaPlayer﹕ error (1, -1004)
02-26 13:19:13.010  25262-25274/com.test.webviewtest V/MediaPlayer﹕ callback application
02-26 13:19:13.020  25262-25274/com.test.webviewtest V/MediaPlayer﹕ back from callback
02-26 13:19:13.020  25262-25262/com.test.webviewtest E/MediaPlayer﹕ Error (1,-1004)

And then the blissful silence of no more MediaPlayer logs...

See Android WebView HTML5 Video Spawns MediaPlayer that lives forever on Samsung S4 [Hacked answer found] for more discussion.

26:	        WebAppInterface jsInterface = new WebAppInterface();
27:	        webview.getSettings().setJavaScriptEnabled(true);
28:	        webview.setWebChromeClient(new WebChromeClient());
29:	        webview.addJavascriptInterface(jsInterface, "WebAppInterface");
30:	        webview.loadUrl("file:///android_asset/index.html");

Copernic's full answer:

Sorry, My bad, I didn't pay attention that the class where i was calling the startActivityForResult was only a class and not an Activity.. So when the data was returned it wasn't returned to it..

I'm posting this code in case someone like me didn't pay attention to that.

1- Remove the WebAppInterface.java class

2- WebActivity.java :

import android.os.Bundle;
import android.annotation.SuppressLint;
import android.app.Activity;
import android.content.Intent;
import android.util.Log;
import android.view.Menu;
import android.webkit.JavascriptInterface;
import android.webkit.WebChromeClient;
import android.webkit.WebView;

public class WebActivity extends Activity {

    public static int WEB_APP = 0;

    private static int REQUEST_FOR_ACTIVITY_CODE_SCAN = 1000;
    private static String qr_data = "";

    @SuppressLint("SetJavaScriptEnabled")
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_web);

        WebView webview = (WebView) findViewById(R.id.aw_webView);

        WebAppInterface jsInterface = new WebAppInterface();
        webview.getSettings().setJavaScriptEnabled(true);
        webview.setWebChromeClient(new WebChromeClient());
        webview.addJavascriptInterface(jsInterface, "WebAppInterface");
        webview.loadUrl("file:///android_asset/index.html");
    }

    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        return false;
    }

    protected void onActivityResult(int requestCode, int resultCode, Intent data) {
        // Scan QR
        if (requestCode == REQUEST_FOR_ACTIVITY_CODE_SCAN) {
            if (resultCode == Activity.RESULT_OK) {
                qr_data = data.getStringExtra("qr_data");

                Log.d("QR", qr_data);
            }
        }
        WEB_APP = 0;
    }

    public class WebAppInterface {

        WebAppInterface() {}

        @JavascriptInterface
        public  String startScan() {
            Intent intent = new Intent(WebActivity.this, ScanActivity.class);
            WEB_APP = 1;

            startActivityForResult(intent, REQUEST_FOR_ACTIVITY_CODE_SCAN);

            while(WEB_APP == 1) {}

            Log.d("qr_return", qr_data);

            return qr_data;
        }
    }
}