Comments on: Why does findViewById return null? http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/ Bali Stupa Blog Fri, 03 Feb 2012 17:22:57 +0000 hourly 1 http://wordpress.org/?v=3.2.1 By: lonewolf http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-1084 lonewolf Tue, 15 Nov 2011 20:59:21 +0000 http://www.balistupa.com/blog/?p=69#comment-1084 Thank you for the post, it got me on the right track. I used the following in main.xml: android:id=”@+id/deviceidtext” and got the same null pointer. After changing the code to: android:id=”@+id/devicetext” The program was able to retrieve the correct view. It seems that the parser looks into the naming string aswell for "id" and cannot resolve the situation Thank you for the post, it got me on the right track.

I used the following in main.xml:
android:id=”@+id/deviceidtext”

and got the same null pointer.

After changing the code to:
android:id=”@+id/devicetext”

The program was able to retrieve the correct view.

It seems that the parser looks into the naming string aswell for “id” and cannot resolve the situation

]]> By: dexterminio http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-1080 dexterminio Sat, 15 Oct 2011 17:50:01 +0000 http://www.balistupa.com/blog/?p=69#comment-1080 When you're code is ok, and the null reference is returned, you need to clean your project. Note: To clean the project means to clear out the cache (like the web browser when a page is loaded), so the new changes will be there. In the menu (eclipse menu) Project->Clean... When ask about about the project to Clean, you select "Clean all projects" or "Clean projects selected below". Press the ok button and is done, the project will run ok. When you’re code is ok, and the null reference is returned, you need to clean your project.
Note: To clean the project means to clear out the cache (like the web browser when a page is loaded), so the new changes will be there.
In the menu (eclipse menu) Project->Clean…
When ask about about the project to Clean, you select “Clean all projects” or “Clean projects selected below”.
Press the ok button and is done, the project will run ok.

]]> By: Maverick http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-1076 Maverick Fri, 30 Sep 2011 04:48:45 +0000 http://www.balistupa.com/blog/?p=69#comment-1076 Thanks a lot man!!! mine i was using android:id="@+id/okbutton" from the starting but problem was that i was using a relative layout and had the other component id references with the "+" sign and hence this stupid parser was always returning null when i do findViewById Thanks a lot man!!! mine i was using android:id=”@+id/okbutton” from the starting but problem was that i was using a relative layout and had the other component id references with the “+” sign and hence this stupid parser was always returning null when i do findViewById

]]> By: xian.wang http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-1075 xian.wang Wed, 21 Sep 2011 16:53:14 +0000 http://www.balistupa.com/blog/?p=69#comment-1075 Thanks so much! I was using "android:id" instead of "android:name" to solving this problem. thank your blog~~~ Thanks so much! I was using “android:id” instead of “android:name” to solving this problem. thank your blog~~~

]]> By: Slawek http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-1062 Slawek Tue, 24 May 2011 17:31:36 +0000 http://www.balistupa.com/blog/?p=69#comment-1062 Hi, I am new to Android and I'm trying to figure it out, why I have to call setContentView before findViewById? All inner classes from R.class are static, so they should be initalized before runtime. I can't find answer and your blog was first site where is article about that. Hi,
I am new to Android and I’m trying to figure it out, why I have to call setContentView before findViewById? All inner classes from R.class are static, so they should be initalized before runtime. I can’t find answer and your blog was first site where is article about that.

]]> By: GYI http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-1032 GYI Wed, 12 Jan 2011 05:02:55 +0000 http://www.balistupa.com/blog/?p=69#comment-1032 Excellent: problem solved. I was using name='@+id/var' instead of android:id='@id/var' (it still generated ids in the R.java file which threw me off). Excellent: problem solved. I was using name=’@+id/var’ instead of android:id=’@id/var’ (it still generated ids in the R.java file which threw me off).

]]> By: RockU http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-916 RockU Tue, 12 Oct 2010 07:26:49 +0000 http://www.balistupa.com/blog/?p=69#comment-916 Thanks so much. I have been stuck on this for quite a while. Thanks so much. I have been stuck on this for quite a while.

]]> By: Michael http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-800 Michael Sun, 13 Jun 2010 20:21:45 +0000 http://www.balistupa.com/blog/?p=69#comment-800 Oye! Thanks so much! I've been struggling with this for hours. damn setContentView... Oye! Thanks so much! I’ve been struggling with this for hours. damn setContentView…

]]> By: Eric http://www.balistupa.com/blog/2009/07/why-does-findviewbyid-return-null/#comment-789 Eric Fri, 23 Oct 2009 23:17:47 +0000 http://www.balistupa.com/blog/?p=69#comment-789 thanks dude! I've been trying to get a reference to a TextView that I have as part of a custom xml list layout for hours (I was missing the android bit from id on the TextView element) Eric thanks dude! I’ve been trying to get a reference to a TextView that I have as part of a custom xml list layout for hours (I was missing the android bit from id on the TextView element)
Eric

]]>