Hey guys, This is my first stab at programmable graphics on Android and I'm running into some LifeCycle issues (I think). If any of the gurus on the board could point me in the right direction, I'd appreciate it. Here's the scenario:
1. Dialog box that contains a GridView. 2. GridView contains an ImageAdapter (extends BaseAdapter) 3. ImageAdapter contains an ImageView, which is returned on getView, handing the recycling based on the convertView parameter. It's about 95% of the http://developer.android.com/resources/tutorials/views/hello-gallery.html ImageAdapter. 4. The ImageView is either an ImageResource or an ImageDrawable. If the ImageResource for the given element is available, it uses that. If not, it constructs a custom Drawable that's a filled rectangle with the name of the element in text. I recently added the custom drawable portion, so I believe that's part of my issue, as it was working previously. The behavior I'm seeing is that when the Dialog is 1st displayed, everyhting happens as expected; however, when I close the dialog and open it back up, the application crashes with the following stack: <pre> java.lang.NullPointerException at android.view.ViewConfiguration.get(ViewConfiguration.java:211) at android.view.View.<init>(View.java:1814) at android.widget.ImageView.<init>(ImageView.java:103) at com.federated.droid.moose.input.BrandSelectionGrid $ImageAdapter.getView(BrandSelectionGrid.java:154) at android.widget.AbsListView.obtainView(AbsListView.java:1315) at android.widget.GridView.onMeasure(GridView.java:932) at android.view.View.measure(View.java:8173) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java: 3132) at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) at android.view.View.measure(View.java:8173) at android.widget.LinearLayout.measureVertical(LinearLayout.java:526) at android.widget.LinearLayout.onMeasure(LinearLayout.java:304) at android.view.View.measure(View.java:8173) at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java: 3132) at android.widget.FrameLayout.onMeasure(FrameLayout.java:245) at android.view.View.measure(View.java:8173) at android.view.ViewRoot.performTraversals(ViewRoot.java:801) at android.view.ViewRoot.handleMessage(ViewRoot.java:1727) at android.os.Handler.dispatchMessage(Handler.java:99) at android.os.Looper.loop(Looper.java:123) at android.app.ActivityThread.main(ActivityThread.java:4627) at java.lang.reflect.Method.invokeNative(Native Method) at java.lang.reflect.Method.invoke(Method.java:521) at com.android.internal.os.ZygoteInit $MethodAndArgsCaller.run(ZygoteInit.java:868) at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:626) at dalvik.system.NativeStart.main(Native Method) </pre> The getView method looks like this: <pre> public View getView( int position, View convertView, ViewGroup parent ) { if (convertView == null) { // if it's not recycled, initialize some attributes imageView = new ImageView( mContext ); imageView.setLayoutParams( new GridView.LayoutParams( thumbHeightPx, thumbWidthPx ) ); imageView.setScaleType( ImageView.ScaleType.CENTER_CROP ); imageView.setBackgroundResource( R.drawable.acc_brand_select_background ); } else { imageView = (ImageView) convertView; } Brand theBrand = Moose.getUser().getBrandList().get( position ); BrandType type = BrandResourceDictionary.getBrandById( theBrand.getId() ); if( type == null ) { BrandThumbnail brandThumb = new BrandThumbnail( theBrand ); imageView.setImageDrawable( brandThumb ); imageView.setOnClickListener( new BrandImageClick( theBrand.getId() ) ); } else { imageView.setImageResource( type.getThumbResource() ); imageView.setOnClickListener( new BrandImageClick( type.getId() ) ); } if (position < imageViewList.size()) { imageViewList.set( position, this ); } else { imageViewList.add( this ); } return imageView; } </pre> With the error coming on line 154: imageView = new ImageView( mContext ); (Line 5 in the pasted code above) Why does it crash when displaying the second time? Am I fundamentally missing a part of the lifecycle of this object? Any other advice you can give me? Thanks for reading throgh the post! I really appreciate any help I can get! Thanks, Evan Ruff, Atlanta -- 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
