java.lang.ExceptionInInitializerError

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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.ExceptionInInitializerError at android.content.ContentProvider.attachInfo(ContentProvider.java:929) at android.app.ActivityThread.installProvider(ActivityThread.java:4260) at android.app.ActivityThread.acquireProvider(ActivityThread.java:4058) at android.app.ContextImpl$ApplicationContentResolver.acquireProvider(ContextImpl.java:1618) at android.content.ContentResolver.acquireProvider(ContentResolver.java:949) at android.content.ContentResolver.acquireContentProviderClient(ContentResolver.java:984) at android.content.AbstractThreadedSyncAdapter$SyncThread.run(AbstractThreadedSyncAdapter.java:245) 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.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:607) at android.os.AsyncTask$InternalHandler.<init>(AsyncTask.java:607) at android.os.AsyncTask.<clinit>(AsyncTask.java:190) ... 7 more

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