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Can't create handler inside thread that has not called Looper.prepare()
java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()	at android.os.Handler.(Handler.java:200)	at android.os.Handler.(Handler.java:114)	at com.wolter.WebViewActivity$OpenWebviewTask.doInBackground(WebViewActivity.java:541)	at com.wolter.WebViewActivity$OpenWebviewTask.doInBackground(WebViewActivity.java:512)	at android.os.AsyncTask$2.call(AsyncTask.java:288)	at java.util.concurrent.FutureTask.run(FutureTask.java:237)	at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:231)	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1112)	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:587)	at java.lang.Thread.run(Thread.java:841)