I've looked at WallpaperService source code, and I pretty sure you can't
use isPreview in onCreateEngine.
On Friday, 7 September 2012 11:00:46 UTC+3, JPS wrote:
>
>
>
> On Friday, September 7, 2012 9:19:42 AM UTC+2, JPS wrote:
>>
>> Hi
>> I am developing a live wallpaper and want the preview mode to display a
>> bitmap as opposed to the regular animation in "run" mode.
>>
>> I know I should use the isPreview() call and all my searches indicate
>> that I should do this in the onCreateEngine() method which is what I did.
>> However I get a nullPointerException. I have tried other locations and the
>> only locations it works are located too far down to perform initialisation.
>>
>> Any help is Greatly appreciated.
>>
>> Thanks
>>
>> JPS
>>
>>
>> @Override
>> public Engine onCreateEngine() {
>> mEng = new WallpaperEngine();
>>
>> if (mEng!= null) {
>> *if (mEng.isPreview()) { // crash here*
>> Log.d(TAG, "preview mode");
>> // display preview bitmap
>> } else {
>> Log.d(TAG, "run mode");
>> // perform full initalization
>> }
>> }
>>
>> return mEng;
>> }
>>
>>
> Hi Calin
>
> here is the crash log
>
> 09-07 09:58:33.441: E/AndroidRuntime(2101): FATAL EXCEPTION: main
> 09-07 09:58:33.441: E/AndroidRuntime(2101): java.lang.NullPointerException
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> android.service.wallpaper.WallpaperService$Engine.isPreview(WallpaperService.java:332)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> com.aajo.appia.LiveWallpaper.onCreateEngine(LiveWallpaper.java:205)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> android.service.wallpaper.WallpaperService$IWallpaperEngineWrapper.executeMessage(WallpaperService.java:872)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> com.android.internal.os.HandlerCaller$MyHandler.handleMessage(HandlerCaller.java:61)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> android.os.Handler.dispatchMessage(Handler.java:99)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> android.os.Looper.loop(Looper.java:130)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> android.app.ActivityThread.main(ActivityThread.java:3683)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> java.lang.reflect.Method.invokeNative(Native Method)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> java.lang.reflect.Method.invoke(Method.java:507)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:839)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> com.android.internal.os.ZygoteInit.main(ZygoteInit.java:597)
> 09-07 09:58:33.441: E/AndroidRuntime(2101): at
> dalvik.system.NativeStart.main(Native Method)
>
> Is this what you needed?
>
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