android - Caused by: android.view.ViewRootImpl$CalledFromWrongThreadException [duplicate]

Answer 1

will add some points to what @user370305 Said,

You can not touch UI Elements in non-ui thread.

If you are using AsyncTask doInBackground is executed in non-ui thread so you can't access ImageView in that .

You can access UI elements in onPreExecute,onProgressUpdate & onPostExcecute.

Answer 2

Bad practice of use of AsyncTask,

You are trying to update your Main UI Thread from doInBackGround() as AsyncTask never allowed that.

Never update your UI from doInBackGround() of AsyncTask as its only worker thread. So write your Main UI updatation code in onPostExecute() method of AsyncTask..

@Override
        protected Void doInBackground(Void... params) {             
            try {
                URL myFileUrl = new URL("http://sposter.smartag.my/images/chicken_soup.jpg");
                HttpURLConnection conn= (HttpURLConnection)myFileUrl.openConnection();
                conn.setDoInput(true);
                conn.connect();
                InputStream is = conn.getInputStream();
                downloadBitmap = BitmapFactory.decodeStream(is);
                            } catch (FileNotFoundException e) {             
                e.printStackTrace();
            }
            catch (IOException e) {         
                e.printStackTrace();
            }               
            return null;
        }

@Override
onPostExecute()
{
 ImageView image = (ImageView) findViewById(R.id.imview);            
            image.setImageBitmap(downloadBitmap);
}