Javascript not working for WebView - Android

Question

Currently I have this code where I want to retrieve a content of a webview and also at the same time remove display on some part of the webview but my code didn't do anything at all or showing any error so I'm at loss here. Currently, I'm referring to this and this post for my code.

This is the page where my webview display link

This is my code 'WebViewActivity.java`

public class WebViewActivity extends Activity{

TextToSpeech textToSpeech;


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

    final WebView webview = (WebView) findViewById(R.id.webView);
    TextView contentView = (TextView) findViewById(R.id.contentView);


    Intent intent = getIntent();
    String Address = intent.getStringExtra("URL");
    //Log.d("Valuer", value);
    //tt1.setText(value);

    class MyJavaScriptInterface
    {
        private TextView contentView;

        public MyJavaScriptInterface(TextView aContentView)
        {
            contentView = aContentView;
        }

        @SuppressWarnings("unused")
        @SuppressLint("JavascriptInterface")

        public void processContent(String aContent)
        {
            final String content = aContent;
            contentView.post(new Runnable()
            {
                public void run()
                {
                    contentView.setText(content);
                }
            });
        }
    }

    webview.getSettings().setLoadsImagesAutomatically(true);
    webview.addJavascriptInterface(new MyJavaScriptInterface(contentView), "INTERFACE");
    webview.getSettings().setJavaScriptEnabled(true);
    webview.setScrollBarStyle(View.SCROLLBARS_INSIDE_OVERLAY);
    webview.setWebViewClient(new WebViewClient() {
        @Override
        public void onPageFinished(WebView view, String url)
        {
            webview.loadUrl("javascript:window.INTERFACE.processContent(document.getElementsByClassName('western')[0].innerText);");
            webview.loadUrl("javascript:(function() { " +
                    "document.getElementsByTagName('section')[0].style.display=\"none\"; " +
                    "})()");
        }
    });



    webview.loadUrl(Address);
    //textToSpeech.speak("TALK", TextToSpeech.QUEUE_FLUSH, null);


}



}

score 2 · Accepted Answer · answered Jul 29 '16 at 05:57

2

try this, By adding this line

       " webview.getSettings().setJavaScriptEnabled(true);"

and Go to your "Proguard.rules" file and make that commented code workable for javascript

    # If your project uses WebView with JS, uncomment the following
    # and specify the fully qualified class name to the JavaScript interface
    # class:
    #-keepclassmembers class fqcn.of.javascript.interface.for.webview {
    #   public *;
    #}

answered Jul 29 '16 at 05:57

Akash Dubey

1,340
12
32

Thank you for your respond. Just by removing the # right ? I don't need to edit anything else? Can I know why android didn't just enable this in default settings? Is it due to security reasons? – azriebakri Jul 29 '16 at 07:03
Yes just remove "#". And yes I think JavaScript is very sensitive thing to use, and it might take plenty of burden to manage it, that's why they recommend this. – Akash Dubey Jul 29 '16 at 07:18
What does it means by "specify the fully qualified class name to the JavaScript interface class"? – azriebakri Jul 29 '16 at 07:20
Please do google your questions!! The fully-qualified name for a class or interface is the package name followed by the class/interface name, separated by a period (.). For example, "com.marakana.utils.MyClass" – Akash Dubey Jul 29 '16 at 07:25

Javascript not working for WebView - Android

1 Answers1