Webview and javascript use

Question

Hi Im trying to get a certain variable value from a local HTML page. The function simply returns the value of a simple variable called x ( x is set to 5 ) so I want to call this function in android. Here is my code so far:

  @Override
public void onCreate(Bundle savedInstanceState) 
{
    super.onCreate(savedInstanceState);
    setContentView(R.layout.main);
    mWebView = (WebView) findViewById(R.id.webview);

    WebSettings webSettings = mWebView.getSettings();
    webSettings.setSaveFormData( false );
    mWebView.getSettings().setJavaScriptEnabled(true);
    mWebView.loadUrl( "file:///android_asset/tester.html" );

    getScript = (Button) findViewById( R.id.test );
    getScript.setOnClickListener( new View.OnClickListener() 
    {
        @Override
        public void onClick(View v) 
        {
            mWebView.loadUrl( "javascript:getX()" );
        }
    });
    Toast.makeText( this, "Hello World", duration );
}

So the idea is that when the getScript button is called it calls the function on the HTML page but how would i get that value displayed? Like in the toast message below it?

Cheers

CommonsWare · Accepted Answer · 2012-03-07 14:03:59Z

1

Option #1: Add a WebChromeClient to your WebView, implement onJSAlert() in the WebChromeClient, and have your JavaScript code use alert()

Option #2: Add a custom JavaScript->Java bridge object to WebKit via addJavaScriptInterface(), and have your JavaScript code call something on that object

answered Mar 7, 2012 at 14:03

CommonsWare

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2 Comments

Katana24 Over a year ago

Thanks mate I'll have to do some research on it all - just seems to be bait complicated at this point

Katana24 Over a year ago

Hello all - Thought I'd leave a great link here that clarified my javascript/webview issues - code.google.com/p/openmobster/wiki/JavascriptBridge The only difference I did was to not load my stuff on the onResume() method. Cheers again CommonsWare

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