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POAndroid- using addJavaScriptInterface to return a value from Javascript
 

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  1. POAndroid- using addJavaScriptInterface to return a value from Javascript
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    <p>So i know there are other posts addressing the same issue, and I think I've followed them to the letter but alas to no avail. I'm trying to learn how to get my app to interact with javascript. I just want to be able to return a value from my javascript to my activity.<br> here is my activity:</p> <pre><code>public class JSExample extends Activity { WebView mWebView; String mString; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); mWebView = (WebView)findViewById(R.id.mWebView); mWebView.addJavascriptInterface(new ClsAccessor(), "accessor"); String html = getAssetsContent("jsinterface.html"); mWebView.loadDataWithBaseURL(null, html, "text/html", "UTF-8", null); // Log.d("YO!", mString); } private String getAssetsContent(String filename){ ..... } private void closeStream(BufferedReader stream) { ..... } class ClsAccessor{ public void setValue(String value){ JSExample.this.mString = value; } } </code></pre> <p>Here is the html file loaded by my WebView that contains the javascript i want to run:</p> <pre><code> &lt;!DOCTYPE html&gt; &lt;html&gt; &lt;head&gt; &lt;script language="javascript"&gt; accessor.setValue('Hello!'); &lt;/script&gt; &lt;/head&gt; &lt;body&gt; &lt;h1&gt;Testing&lt;/h1&gt; &lt;/body&gt; &lt;/html&gt; </code></pre> <p>This does not work. When i run the code with "Log.d("YO!", mString);" uncommented I get a null pointer exception, which means that the javascript never assigned a value to mString. what am i doing wrong?</p>
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    2. COoh silly me. yes i am running into a problem. when the line "Log.d("YO!", mString)" is uncommented I get a NullPointerException, meaning that mString was never assigned a value, which means the binding of javascript to java failed. so what am i doing wrong?
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