Thanks for the reply. I've been looking into this some more, and it looks views must be referenced from the thread in which they were inflated. Looks like I should be interacting with views from the main thread, and using a Handler object to interact with this thread from the worker thread.
On 17 May, 02:15, Dianne Hackborn <[email protected]> wrote: > You probably shouldn't be doing this at all. Certainly, you shouldn't be > touching the view hierarchy from another thread. I would expect what you > are saying to actually work (and that you would get much more subtle > errors), but it's hard to say without seeing the code and considering that > there is a thread there running independently of the view hierarchy it is > touching. > > On Sat, May 16, 2009 at 12:29 PM, steve_macleod > <[email protected]>wrote: > > > > > > > > > OK, I have been looking into this some more, and it seems that the > > reference to my ImageView is null. > > My code is organised as follows: > > > Activity onCreate sets an onClick event > > when the onClick event is activated, setContentView(layout_01) is > > executed (this is the xml file which contains the ImageView) - as > > part of this xml file, a class which extends SurfaceView is inflated. > > onCreate of this SurfaceView creates a thread (which is in inner > > class) - that thread attempts to use the ImageView via findViewById, > > which returns null. > > > Am I out-of-scope in attempting to reference the ImageView like this? > > If so, how should I reference it? > > > Thanks, > > > On May 16, 4:38 pm, steve_macleod <[email protected]> wrote: > > > Hi, > > > I am attempting to animate an ImageView using frame-by-frame > > > animation. I am using the following code: > > > > ImageView pacImageV = (ImageView) findViewById(R.id.pacAnim); > > > pacImageV.setBackgroundResource(R.anim.pacanim); > > > pacManCharAnim = (AnimationDrawable) pacImageV.getBackground(); > > > > ********************************* > > > > <?xml version="1.0" encoding="utf-8"?> > > > <FrameLayout xmlns:android="http://schemas.android.com/apk/res/ > > > android" > > > android:layout_width="fill_parent" > > > android:layout_height="fill_parent"> > > > > <android.pacman.com.PacManMainView > > > android:id="@+id/pacman_main_view" > > > android:layout_width="fill_parent" > > > android:layout_height="fill_parent"/> > > > > <RelativeLayout > > > android:layout_width="fill_parent" > > > android:layout_height="fill_parent" > > > > > <TextView > > > android:id="@+id/gamescreen_txt" > > > android:text="@string/hello" > > > android:visibility="visible" > > > android:layout_width="wrap_content" > > > android:layout_height="wrap_content" > > > android:layout_centerInParent="true" > > > android:gravity="center_horizontal" > > > android:textColor="#88ffffff" > > > android:textSize="24sp" > > > android:paddingTop="400px"/> > > > </RelativeLayout> > > > > <ImageView > > > android:id="@+id/pacAnim" > > > android:layout_width="20px" > > > android:layout_height="20px" > > > android:scaleType="center" > > > android:src="@drawable/pac01"/> > > > > </FrameLayout> > > > > ********************************* > > > > <animation-list xmlns:android="http://schemas.android.com/apk/res/ > > > android" > > > android:oneshot="true"> > > > <item android:drawable="@drawable/pac01" android:duration="200" / > > > > <item android:drawable="@drawable/pac02" android:duration="200" / > > > > </animation-list> > > > > ********************************* > > > > Logcat shows a null pointer exception for the > > > pacImageV.setBackgroundResource(R.anim.pacanim) line. > > > Perhaps I am following the example incorrectly. I am using the 1.5 > > > sdk. Can anyone assist with this? > > -- > Dianne Hackborn > Android framework engineer > [email protected] > > Note: please don't send private questions to me, as I don't have time to > provide private support, and so won't reply to such e-mails. All such > questions should be posted on public forums, where I and others can see and > answer them.- Hide quoted text - > > - Show quoted text - --~--~---------~--~----~------------~-------~--~----~ You received this message because you are subscribed to the Google Groups "Android Developers" group. To post to this group, send email to [email protected] To unsubscribe from this group, send email to [email protected] For more options, visit this group at http://groups.google.com/group/android-developers?hl=en -~----------~----~----~----~------~----~------~--~---
