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. --~--~---------~--~----~------------~-------~--~----~ 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 -~----------~----~----~----~------~----~------~--~---
