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  1. ,
    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 GitHub by srvrguy
, 1 year ago
An error occured while executing doInBackground()
via GitHub by guimellon
, 1 year ago
An error occured while executing doInBackground()
via GitHub by justincpollard
, 10 months ago
An error occured while executing doInBackground()
java.lang.RuntimeException: An error occured while executing doInBackground() at android.os.AsyncTask$3.done(AsyncTask.java:299) at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273) at java.util.concurrent.FutureTask.setException(FutureTask.java:124) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307) at java.util.concurrent.FutureTask.run(FutureTask.java:137) at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:230) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569) at java.lang.Thread.run(Thread.java:856)Caused by: java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() at android.os.Handler.<init>(Handler.java:121) at android.widget.Toast$TN.<init>(Toast.java:361) at android.widget.Toast.<init>(Toast.java:97) at android.widget.Toast.makeText(Toast.java:254) at android.widget.Toast.makeText(Toast.java:304) at com.nextgis.maplibui.util.LayerUtil$ExportGeoJSONTask.doInBackground(LayerUtil.java:208) at com.nextgis.maplibui.util.LayerUtil$ExportGeoJSONTask.doInBackground(LayerUtil.java:113) at android.os.AsyncTask$2.call(AsyncTask.java:287) at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305) ... 5 more