java - unfortunately app has stopped in android emulator after adding webview -


i trying build android application takes input[array values] java , passing java script , html file. have created web view concept. when execute app not working. here code. html file take array values , plot graph

package com.example.helloworld;  import android.os.bundle; import android.webkit.javascriptinterface; import android.webkit.webview;   import org.apache.cordova.*;  public class mainactivity extends droidgap { webview webview; final class chartdataloader{ @javascriptinterface public double[][] getdata(){ double[][] data = { {10,10}, {20, 10} }; return data; }                }  public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); //setcontentview(r.layout.activity_main); webview.addjavascriptinterface(new chartdataloader(), "dataloader"); webview.loadurl("file:///android_asset/www/index.html");  } }

html file

<html> <head> <script type="text/javascript" src="jscharts.js"></script> </head>  <body> <div id="chartcontainer">you should see chart here.</div>  <script type="text/javascript">  mydata = dataloader.getdata();  alert("datareceived: " + mydata.length); alert("element 0 : " + mydata[0]);  var mychart = new jschart('chartcontainer', 'line'); mychart.setdataarray(mydata); mychart.draw();  </script> </body> </html>

from comments droidgap emulator name.

so change to

public class mainactivity extends activity {

this 

//setcontentview(r.layout.activity_main); // uncomment

is commented

and webview not initialized.

example:

webview webview; public void oncreate(bundle savedinstancestate) { super.oncreate(savedinstancestate); setcontentview(r.layout.activity_main); webview = (webview) findviewbyid(r.id.webview1); // missing

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