Hi,
It's very much sure isPreview() does not work within service Engine
instantitation method. Not only for null pointer but there's no way newly
created Engine knew whether it's in preview mode or not.
Also, bear in mind it's not guaranteed a new Engine is created for preview
and actual wallpaper. If implemented cleverly same Engine instance can be
used for both situations.
--
H
On Sep 7, 2012 1:45 PM, "Calin Perebiceanu" <calin.perebice...@gmail.com>
wrote:
> 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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