java.lang.RuntimeException

Can't create handler inside thread that has not called Looper.prepare()

Samebug tips1

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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Solutions on the web18569

  • Can't create handler inside thread that has not called Looper.prepare()
  • via GitHub by alhdo
    , 10 months ago
    Can't create handler inside thread that has not called Looper.prepare()
  • Can't create handler inside thread that has not called Looper.prepare()
  • Stack trace

    • 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.<init>(Toast.java:68) at android.widget.Toast.makeText(Toast.java:231)

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