Can't create handler inside thread that has not called Looper

Question

I get the following error:

08-27 17:49:17.995: E/AndroidRuntime(10085): java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()
08-27 17:49:17.995: E/AndroidRuntime(10085):    at android.os.Handler.<init>(Handler.java:121)
08-27 17:49:17.995: E/AndroidRuntime(10085):    at android.widget.Toast$TN.<init>(Toast.java:361)
08-27 17:49:17.995: E/AndroidRuntime(10085):    at android.widget.Toast.<init>(Toast.java:97)
08-27 17:49:17.995: E/AndroidRuntime(10085):    at android.widget.Toast.makeText(Toast.java:254)

when running the first line of:

public static void alertUser(String str) {
    Toast toast = Toast.makeText(mInstance.getApplicationContext(), str,
            Toast.LENGTH_LONG);
    toast.show();

}

how can i fix this?

seems you are updating ui from a thread – Raghunandan Aug 27 '13 at 14:57 — Raghunandan, Aug 27 '13 at 14:57

score 1 · Accepted Answer · answered Aug 27 '13 at 15:01

1

Something like this should work:

public static void alertUser(String str) {

runOnUiThread(setErrorMessage); 

}


private Runnable setErrorMessage = new Runnable() {
    @Override
    public void run() {

        Toast toast = Toast.makeText(mInstance.getApplicationContext(), str,
        Toast.LENGTH_LONG);
toast.show();
    }
};

answered Aug 27 '13 at 15:01

Johan Nordli

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26

but on this answer, they have suggested something else : http://stackoverflow.com/questions/18467470/threading-cant-create-handler-inside-thread-that-has-not-called-looper-prepar – Elad Benda Aug 28 '13 at 07:10

Can't create handler inside thread that has not called Looper

1 Answers1