Getting null object reference in onPostExecute in Asynctask?

Question

Im trying to display my result in asynctask using webview but i got nullpointExc any help will be appreciated.

 @Override
    //Display my result via webview
    protected void onPostExecute(String result) { //where i get my result
        setContentView(R.layout.paynamics_layout);
        WebView myweb = (WebView) view.findViewById(R.id.paynamics_site);
        myweb.loadData(result, "text/html", null); // i got error here
        myweb.canGoBack();
        super.onPostExecute(result);

    }

Here is my error

java.lang.NullPointerException: Attempt to invoke virtual method 'void android.webkit.WebView.loadData(java.lang.String, java.lang.String, java.lang.String)' on a null object reference

Stacktrace and `doInbackground()` method will help better to know the problem. — Nilesh Deokar, Apr 18 '18 at 09:17
Your webView (paynamicsite) was not created yet, and you are trying to access it. — Pedro Massango, Apr 18 '18 at 09:21
`paynamicsite` is null. check the binding code of the object `paynamicsite` — Nilesh Deokar, Apr 18 '18 at 09:21
i update my code guys please take a look still got the same error thank you. — Shan, Apr 18 '18 at 09:45
why are you calling setContentView in onPostExecute and not onCreate of your activity by the way? — Zun, Apr 18 '18 at 09:46
@ZUNJAE , im trying to call my webview layout to show my asynctask result. thank you — Shan, Apr 18 '18 at 09:51

score 1 · Answer 1 · answered Apr 18 '18 at 09:55

1

There's no need to use setContentView. Use it only in onCreate();

You can try any one of the following methods -

Add WebView in your layout if its not already added!
Initialize the WebView variable in onCreate();
Keep the WebView's visibility as View.GONE;
loadData for WebView in OnPostExecute() & make it Visible by setVisibility(View.VISIBLE);

Or

Create another Activity which has a WebView in it;
Get the Data in onPostExecute();
Send the Data with Intent to the other Activity & display the same in the WebView.

answered Apr 18 '18 at 09:55

Darshan

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thanks for this you give me a great idea thank you bro – Shan Apr 18 '18 at 10:18
@ShanMichaelReyes You're Welcome :) – Darshan Apr 18 '18 at 10:19

Getting null object reference in onPostExecute in Asynctask?

1 Answers1