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    via vogella.com by Unknown author

    Any worker thread runs in background, since it is not intended to loop, is not connected to a Looper.for example doInBackground(). its implementation returns will be passed to onPostExecute() which runs on the UI thread.

Solutions on the web

via Coderanch by simone giusti, 1 year ago
An error occurred while executing doInBackground()
via GitHub by billmeek
, 1 year ago
An error occurred while executing doInBackground()
via GitHub by Neamar
, 1 year ago
An error occurred while executing doInBackground()
via GitHub by sarvajeet294
, 10 months ago
An error occurred while executing doInBackground()
via GitHub by Madis0
, 11 months ago
An error occurred while executing doInBackground()
via GitHub by Lineflyer
, 9 months ago
An error occurred while executing doInBackground()
java.lang.RuntimeException: An error occurred while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:309) at java.util.concurrent.FutureTask.finishCompletion(FutureTask.java:354) at java.util.concurrent.FutureTask.setException(FutureTask.java:223) at java.util.concurrent.FutureTask.run(FutureTask.java:242) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:234) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1113) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:588) at java.lang.Thread.run(Thread.java:818)Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>(Handler.java:200) at android.os.Handler.<init>(Handler.java:114) at android.app.Activity.<init>(Activity.java:754) at it.rockopera.SCSremote.TcpClient.<init>(TcpClient.java:60) at it.rockopera.SCSremote.ClientActivity$ConnectTask.doInBackground(ClientActivity.java:237) at it.rockopera.SCSremote.ClientActivity$ConnectTask.doInBackground(ClientActivity.java:231) at android.os.AsyncTask$2.call(AsyncTask.java:295) at java.util.concurrent.FutureTask.run(FutureTask.java:237) ... 4 more