Null pointer exception on doing webview.loadUrl()

Issue

I've been getting this error in my developer portal. I'm not sure why. Stack trace tracks back into some internal function call inside WebView object.

java.lang.NullPointerException
at android.webkit.WebView.loadUrlImpl(WebView.java:3008)
at android.webkit.WebView.loadUrlImpl(WebView.java:3047)
at android.webkit.WebView.loadUrl(WebView.java:3040)
at com.myapp.android.PreviewActivity.notifyJS(PreviewActivity.java:175)
at com.myapp.android.PreviewActivity.access$14(PreviewActivity.java:174)
at com.myapp.android.PreviewActivity$ActionBarItemClickListener.onClick(PreviewActivity.java:901)
at android.view.View.performClick(View.java:3644)
at android.view.View$PerformClick.run(View.java:14313)
at android.os.Handler.handleCallback(Handler.java:605)
at android.os.Handler.dispatchMessage(Handler.java:92)
at android.os.Looper.loop(Looper.java:137)
at android.app.ActivityThread.main(ActivityThread.java:4517)
at java.lang.reflect.Method.invokeNative(Native Method)
at java.lang.reflect.Method.invoke(Method.java:511)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:993)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:760)
at dalvik.system.NativeStart.main(Native Method)

In my code at com.myapp.android.PreviewActivity.notifyJS(PreviewActivity.java:175), there is this line webView.loadUrl("javascript:MyApp.onClick('" + action + "');");

I'm actually invoking a javascript call from my java code. Has anyone faced this issue before?

Solution

I found the answer myself. If webView.destroy() has already been called then calling webView.loadUrl() will cause this exception.

Answered By - Sudarshan Bhat