Can't create handler inside thread Thread[Thread-5,5,main] that has not called Looper.prepare()

Question

What does the following exception mean; how can I fix it? This is the code:

    if (response.isSuccessful()) {
                        String message = response.body().string();
                        JSONObject jsonObject = new JSONObject(message);

                        new AlertDialog.Builder(mcontext)
                                .setTitle("title：")
                                .setMessage(TmpPwd)
                                .setPositiveButton("close", new DialogInterface.OnClickListener() {
                                    @Override
                                    public void onClick(DialogInterface dialog, int which) {
                                    }
                                })
                                .show();
                    }

This is the exception:

    W/System.err: java.lang.RuntimeException: Can't create handler inside thread Thread[Thread-5,5,main] that has not called Looper.prepare()
        at android.os.Handler.<init>(Handler.java:205)

Yeah, you might be calling this code on a non-UI thread – Sander Rito Feb 28 '19 at 06:39 — Sander Rito, Feb 28 '19 at 06:39

score 4 · Accepted Answer · answered Feb 28 '19 at 06:54

Inside your onResponse show your dialog like below inside a UI thread

activity.runOnUiThread(new Runnable() {
  public void run() {
  new AlertDialog.Builder(mcontext)
       .setTitle("title：")
       .setMessage(TmpPwd)
       .setPositiveButton("close", new DialogInterface.OnClickListener() {
            @Override
            public void onClick(DialogInterface dialog, int which) {
        }
    })
    .show();
  }
});

score 1 · Answer 2 · answered Feb 28 '19 at 06:38

1

Handler h = new Handler(Looper.getMainLooper());
 h.post(new Runnable() {
  public void run() {
  //here show dialog
}
});

answered Feb 28 '19 at 06:38

Jinal Awaiya

441
3
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Can't create handler inside thread Thread[Thread-5,5,main] that has not called Looper.prepare()

2 Answers2