java.lang.RuntimeException

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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.

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    • 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.widget.Toast$TN.<init>(Toast.java:345) at android.widget.Toast.<init>(Toast.java:101) at android.widget.Toast.makeText(Toast.java:259) at oracle.cloud.mobile.gettingstarted.UploadPictureActivity.launchMainActivity(UploadPictureActivity.java:76) at oracle.cloud.mobile.gettingstarted.UploadPictureActivity.access$400(UploadPictureActivity.java:24) at oracle.cloud.mobile.gettingstarted.UploadPictureActivity$UploadImageTask.doInBackground(UploadPictureActivity.java:110) at oracle.cloud.mobile.gettingstarted.UploadPictureActivity$UploadImageTask.doInBackground(UploadPictureActivity.java:95) at android.os.AsyncTask$2.call(AsyncTask.java:295) at java.util.concurrent.FutureTask.run(FutureTask.java:237) ... 4 more

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