android null pointer error: can't get context

Question

HI when a new a alert dialog in android app, and there is a null point exception, saying that the viewroot can't get context, and the return of context is null. so has anyone meet the same problem. and give me some help. thx.

Please post the codes that you have here.

xandy
– xandy

2012-04-26 02:43:42 +00:00
Commented Apr 26, 2012 at 2:43 — xandy
– xandy, Commented Apr 26, 2012 at 2:43
also put code how you are creating dialog

Shankar Agarwal
– Shankar Agarwal

2012-04-26 02:46:32 +00:00
Commented Apr 26, 2012 at 2:46 — Shankar Agarwal
– Shankar Agarwal, Commented Apr 26, 2012 at 2:46

Mathi · Accepted Answer · 2012-11-05 15:35:03Z

2

You shouldn't use getapplicationcontext() for alertdialog box. Instead of this, Use the activity class name.

if your activity name is AlertBuilderActivity use

          (AlertBuilderActivity.this) for context

answered Nov 5, 2012 at 15:35

Mathi

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Shankar Agarwal · Accepted Answer · 2012-04-26 02:50:15Z

0

AlertDialog alertDialog = new AlertDialog.Builder(YourActivity.this).create();

for creating alert dialog you cant use getApplicationContext() you must use as in the above line.

AlertDialog alertDialog = new AlertDialog.Builder(getApplicationContext()).create();

answered Apr 26, 2012 at 2:50

Shankar Agarwal

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2 Comments

sarah Over a year ago

HI Agarwal , thanks a lot. Your method could solve the dialog creating in apk. Because there is a looper in this main thread, then dialog could be showed.

sarah Over a year ago

^_^, sorry for late reply. I mean that you method works well in apk.

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