I move all textures & world initialization to Engine.onCreate, in onDestroy clear world & textures, all work good, but, i worry that if on device installed 2 different applications and some textures has equals names?  TextureManager instance will be the same for both?

sorry, i dont remove removing textures code, now 6 time without crash . Too late, i did not realize anything now, this wallpaper make me crazy I will continue tomorrow

in wallpaper service in oncreateEngine

texturesCreated = false;

...

if (!texturesCreated){
redCell = new Texture(BitmapHelper.rescale(BitmapHelper.convert(getResources().getDrawable(R.drawable.red_cell)), 64, 64));
blueCell = new Texture(BitmapHelper.rescale(BitmapHelper.convert(getResources().getDrawable(R.drawable.blue_cell)), 64, 64));
aNuc = new Texture(BitmapHelper.rescale(BitmapHelper.convert(getResources().getDrawable(R.drawable.nuc_a)), 64, 64));
tNuc = new Texture(BitmapHelper.rescale(BitmapHelper.convert(getResources().getDrawable(R.drawable.nuc_t)), 64, 64));
gNuc = new Texture(BitmapHelper.rescale(BitmapHelper.convert(getResources().getDrawable(R.drawable.nuc_g)), 64, 64));
cNuc = new Texture(BitmapHelper.rescale(BitmapHelper.convert(getResources().getDrawable(R.drawable.nuc_c)), 64, 64));
TextureManager.getInstance().addTexture("redCell", redCell);
TextureManager.getInstance().addTexture("blueCell", blueCell);
TextureManager.getInstance().addTexture("aNuc", aNuc);
TextureManager.getInstance().addTexture("tNuc", tNuc);
TextureManager.getInstance().addTexture("gNuc", gNuc);
TextureManager.getInstance().addTexture("cNuc", cNuc);
texturesCreated = true;
}

ERROR: Tried to set an undefined texture as default! - and because that i recreating rextures in onSurfaceCreated

sorry, i don read your last replay, i try create once

dont help.
if use this removing

if (fb != null) {
System.out.println("************************************ remove textures");
TextureManager tm = TextureManager.getInstance();
Set<String> names = tm.getNames();
if (names != null && !names.isEmpty()){
for (String name : names){
tm.removeAndUnload(name, fb);
}
}
fb.dispose();
fb = null;
}


first after recreate -  ERROR: A texture with the name 'redCell' has been declared twice! -  (in try{}catch)
and second, when try set - ERROR: Tried to set an undefined texture as default!

... only 4 running, the same.    I try

TextureManager tm = TextureManager.getInstance();
Set<String> names = tm.getNames();
if (names != null && !names.isEmpty()){
for (String name : names){
tm.removeTexture(name);
}
}

but then, when textures remove and next create command trying set their - throw exception about textures allredy exists.
How i can clear TM singleton ?

aaaaaaaaaaaaaaaaaaaaaaa, i forgot world.removeAll();   , trying with it

this method now used for clearing. I refactor some in object building (use clone) and now on 4th running  memory out, so objects dont removing

public void release() {
System.out.println("Clear renderer");
if (world != null) {
world.dispose();
world = null;
}
if (fb != null) {
fb.dispose();
fb = null;
}
}


Now, when i go to preview wallpaper 2nd time, i have java.lang.OutOfMemoryError.

08-08 21:42:01.784: INFO/jPCT-AE(22421): OpenGL vendor:     Qualcomm
08-08 21:42:01.784: INFO/jPCT-AE(22421): OpenGL renderer:   Adreno 205
08-08 21:42:01.784: INFO/jPCT-AE(22421): OpenGL version:    OpenGL ES-CM 1.1
08-08 21:42:01.794: INFO/jPCT-AE(22421): OpenGL renderer initialized (using 2 texture stages)
08-08 21:42:01.814: INFO/jPCT-AE(22421): Subobject of object 379/object381 compiled to flat fixed point data using 384 vertices in 3ms!
08-08 21:42:01.814: INFO/jPCT-AE(22421): Object 379/object381 compiled to 1 subobjects in 12ms!
08-08 21:42:01.814: INFO/jPCT-AE(22421): Object 'object381' uses one texture set!
08-08 21:42:01.824: INFO/jPCT-AE(22421): Subobject of object 381/object383 compiled to flat fixed point data using 384 vertices in 4ms!
08-08 21:42:01.824: INFO/jPCT-AE(22421): Object 381/object383 compiled to 1 subobjects in 10ms!
08-08 21:42:01.824: INFO/jPCT-AE(22421): Object 'object383' uses one texture set!
08-08 21:42:01.824: INFO/jPCT-AE(22421): [ 1312828921830 ] - WARNING: Object object385 hasn't been build yet. Forcing build()!
08-08 21:42:01.864: INFO/jPCT-AE(22421): Subobject of object 383/object385 compiled to flat fixed point data using 4110 vertices in 5ms!
08-08 21:42:01.864: INFO/jPCT-AE(22421): Object 383/object385 compiled to 1 subobjects in 35ms!
08-08 21:42:01.864: INFO/jPCT-AE(22421): [ 1312828921866 ] - WARNING: Object object387 hasn't been build yet. Forcing build()!
08-08 21:42:01.884: INFO/jPCT-AE(22421): Subobject of object 385/object387 compiled to flat fixed point data using 3510 vertices in 5ms!
08-08 21:42:01.884: INFO/jPCT-AE(22421): Object 385/object387 compiled to 1 subobjects in 19ms!
08-08 21:42:01.884: INFO/jPCT-AE(22421): Subobject of object 387/object389 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:01.884: INFO/jPCT-AE(22421): Object 387/object389 compiled to 1 subobjects in 3ms!
08-08 21:42:01.884: INFO/jPCT-AE(22421): Object 'object389' uses one texture set!
08-08 21:42:01.884: INFO/jPCT-AE(22421): Subobject of object 389/object391 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:01.884: INFO/jPCT-AE(22421): Object 389/object391 compiled to 1 subobjects in 2ms!
08-08 21:42:01.884: INFO/jPCT-AE(22421): Object 'object391' uses one texture set!
08-08 21:42:01.884: INFO/jPCT-AE(22421): [ 1312828921892 ] - WARNING: Object object393 hasn't been build yet. Forcing build()!
08-08 21:42:01.894: INFO/jPCT-AE(22421): Subobject of object 391/object393 compiled to flat fixed point data using 366 vertices in 1ms!
08-08 21:42:01.894: INFO/jPCT-AE(22421): Object 391/object393 compiled to 1 subobjects in 2ms!
08-08 21:42:01.894: INFO/jPCT-AE(22421): [ 1312828921896 ] - WARNING: Object object395 hasn't been build yet. Forcing build()!
08-08 21:42:01.894: INFO/jPCT-AE(22421): Subobject of object 393/object395 compiled to flat fixed point data using 264 vertices in 1ms!
08-08 21:42:01.894: INFO/jPCT-AE(22421): Object 393/object395 compiled to 1 subobjects in 2ms!
08-08 21:42:01.894: INFO/jPCT-AE(22421): Subobject of object 395/object397 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:01.894: INFO/jPCT-AE(22421): Object 395/object397 compiled to 1 subobjects in 2ms!
08-08 21:42:01.894: INFO/jPCT-AE(22421): Object 'object397' uses one texture set!
08-08 21:42:01.904: INFO/jPCT-AE(22421): Subobject of object 397/object399 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:01.904: INFO/jPCT-AE(22421): Object 397/object399 compiled to 1 subobjects in 4ms!
08-08 21:42:01.904: INFO/jPCT-AE(22421): Object 'object399' uses one texture set!
08-08 21:42:01.904: INFO/jPCT-AE(22421): [ 1312828921907 ] - WARNING: Object object401 hasn't been build yet. Forcing build()!
08-08 21:42:01.924: INFO/jPCT-AE(22421): Subobject of object 399/object401 compiled to flat fixed point data using 4110 vertices in 5ms!
08-08 21:42:01.924: INFO/jPCT-AE(22421): Object 399/object401 compiled to 1 subobjects in 21ms!
08-08 21:42:01.924: INFO/jPCT-AE(22421): [ 1312828921928 ] - WARNING: Object object403 hasn't been build yet. Forcing build()!
08-08 21:42:01.944: INFO/jPCT-AE(22421): Subobject of object 401/object403 compiled to flat fixed point data using 3510 vertices in 5ms!
08-08 21:42:01.944: INFO/jPCT-AE(22421): Object 401/object403 compiled to 1 subobjects in 19ms!
08-08 21:42:01.944: INFO/jPCT-AE(22421): Subobject of object 403/object405 compiled to flat fixed point data using 384 vertices in 2ms!
08-08 21:42:01.944: INFO/jPCT-AE(22421): Object 403/object405 compiled to 1 subobjects in 3ms!
08-08 21:42:01.944: INFO/jPCT-AE(22421): Object 'object405' uses one texture set!
08-08 21:42:01.944: INFO/jPCT-AE(22421): Subobject of object 405/object407 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:01.944: INFO/jPCT-AE(22421): Object 405/object407 compiled to 1 subobjects in 3ms!
08-08 21:42:01.944: INFO/jPCT-AE(22421): Object 'object407' uses one texture set!
08-08 21:42:01.944: INFO/jPCT-AE(22421): [ 1312828921954 ] - WARNING: Object object409 hasn't been build yet. Forcing build()!
08-08 21:42:01.954: INFO/jPCT-AE(22421): Subobject of object 407/object409 compiled to flat fixed point data using 366 vertices in 1ms!
08-08 21:42:01.954: INFO/jPCT-AE(22421): Object 407/object409 compiled to 1 subobjects in 2ms!
08-08 21:42:01.954: INFO/jPCT-AE(22421): [ 1312828921957 ] - WARNING: Object object411 hasn't been build yet. Forcing build()!
08-08 21:42:01.954: INFO/jPCT-AE(22421): Subobject of object 409/object411 compiled to flat fixed point data using 264 vertices in 0ms!
08-08 21:42:01.954: INFO/jPCT-AE(22421): Object 409/object411 compiled to 1 subobjects in 2ms!
08-08 21:42:01.954: INFO/jPCT-AE(22421): Subobject of object 411/object413 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:01.954: INFO/jPCT-AE(22421): Object 411/object413 compiled to 1 subobjects in 2ms!
08-08 21:42:01.954: INFO/jPCT-AE(22421): Object 'object413' uses one texture set!
08-08 21:42:01.964: INFO/jPCT-AE(22421): Subobject of object 413/object415 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:01.964: INFO/jPCT-AE(22421): Object 413/object415 compiled to 1 subobjects in 3ms!
08-08 21:42:01.964: INFO/jPCT-AE(22421): Object 'object415' uses one texture set!
08-08 21:42:01.964: INFO/jPCT-AE(22421): [ 1312828921966 ] - WARNING: Object object417 hasn't been build yet. Forcing build()!
08-08 21:42:01.984: INFO/jPCT-AE(22421): Subobject of object 415/object417 compiled to flat fixed point data using 4110 vertices in 6ms!
08-08 21:42:01.984: INFO/jPCT-AE(22421): Object 415/object417 compiled to 1 subobjects in 20ms!
08-08 21:42:01.984: INFO/jPCT-AE(22421): [ 1312828921987 ] - WARNING: Object object419 hasn't been build yet. Forcing build()!
08-08 21:42:01.994: INFO/jPCT-AE(22421): Subobject of object 417/object419 compiled to flat fixed point data using 3510 vertices in 4ms!
08-08 21:42:01.994: INFO/jPCT-AE(22421): Object 417/object419 compiled to 1 subobjects in 14ms!
08-08 21:42:02.004: INFO/jPCT-AE(22421): Subobject of object 419/object421 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:02.004: INFO/jPCT-AE(22421): Object 419/object421 compiled to 1 subobjects in 5ms!
08-08 21:42:02.004: INFO/jPCT-AE(22421): Object 'object421' uses one texture set!
08-08 21:42:02.004: INFO/jPCT-AE(22421): Subobject of object 421/object423 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:02.004: INFO/jPCT-AE(22421): Object 421/object423 compiled to 1 subobjects in 2ms!
08-08 21:42:02.004: INFO/jPCT-AE(22421): Object 'object423' uses one texture set!
08-08 21:42:02.004: INFO/jPCT-AE(22421): [ 1312828922010 ] - WARNING: Object object425 hasn't been build yet. Forcing build()!
08-08 21:42:02.004: INFO/jPCT-AE(22421): Subobject of object 423/object425 compiled to flat fixed point data using 366 vertices in 1ms!
08-08 21:42:02.004: INFO/jPCT-AE(22421): Object 423/object425 compiled to 1 subobjects in 3ms!
08-08 21:42:02.004: INFO/jPCT-AE(22421): [ 1312828922013 ] - WARNING: Object object427 hasn't been build yet. Forcing build()!
08-08 21:42:02.014: INFO/jPCT-AE(22421): Subobject of object 425/object427 compiled to flat fixed point data using 264 vertices in 2ms!
08-08 21:42:02.014: INFO/jPCT-AE(22421): Object 425/object427 compiled to 1 subobjects in 4ms!
08-08 21:42:02.014: INFO/jPCT-AE(22421): Subobject of object 427/object429 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:02.014: INFO/jPCT-AE(22421): Object 427/object429 compiled to 1 subobjects in 3ms!
08-08 21:42:02.014: INFO/jPCT-AE(22421): Object 'object429' uses one texture set!
08-08 21:42:02.014: INFO/jPCT-AE(22421): Subobject of object 429/object431 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:02.014: INFO/jPCT-AE(22421): Object 429/object431 compiled to 1 subobjects in 2ms!
08-08 21:42:02.014: INFO/jPCT-AE(22421): Object 'object431' uses one texture set!
08-08 21:42:02.014: INFO/jPCT-AE(22421): [ 1312828922024 ] - WARNING: Object object433 hasn't been build yet. Forcing build()!
08-08 21:42:02.034: INFO/jPCT-AE(22421): Subobject of object 431/object433 compiled to flat fixed point data using 4110 vertices in 6ms!
08-08 21:42:02.034: INFO/jPCT-AE(22421): Object 431/object433 compiled to 1 subobjects in 19ms!
08-08 21:42:02.034: INFO/jPCT-AE(22421): [ 1312828922044 ] - WARNING: Object object435 hasn't been build yet. Forcing build()!
08-08 21:42:02.054: INFO/jPCT-AE(22421): Subobject of object 433/object435 compiled to flat fixed point data using 3510 vertices in 4ms!
08-08 21:42:02.054: INFO/jPCT-AE(22421): Object 433/object435 compiled to 1 subobjects in 17ms!
08-08 21:42:02.054: INFO/jPCT-AE(22421): Subobject of object 435/object437 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:02.054: INFO/jPCT-AE(22421): Object 435/object437 compiled to 1 subobjects in 2ms!
08-08 21:42:02.054: INFO/jPCT-AE(22421): Object 'object437' uses one texture set!
08-08 21:42:02.064: INFO/jPCT-AE(22421): Subobject of object 437/object439 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:02.064: INFO/jPCT-AE(22421): Object 437/object439 compiled to 1 subobjects in 3ms!
08-08 21:42:02.064: INFO/jPCT-AE(22421): Object 'object439' uses one texture set!
08-08 21:42:02.064: INFO/jPCT-AE(22421): [ 1312828922068 ] - WARNING: Object object441 hasn't been build yet. Forcing build()!
08-08 21:42:02.064: INFO/jPCT-AE(22421): Subobject of object 439/object441 compiled to flat fixed point data using 366 vertices in 1ms!
08-08 21:42:02.064: INFO/jPCT-AE(22421): Object 439/object441 compiled to 1 subobjects in 3ms!
08-08 21:42:02.064: INFO/jPCT-AE(22421): [ 1312828922072 ] - WARNING: Object object443 hasn't been build yet. Forcing build()!
08-08 21:42:02.064: INFO/jPCT-AE(22421): Subobject of object 441/object443 compiled to flat fixed point data using 264 vertices in 1ms!
08-08 21:42:02.064: INFO/jPCT-AE(22421): Object 441/object443 compiled to 1 subobjects in 2ms!
08-08 21:42:02.074: INFO/jPCT-AE(22421): Subobject of object 443/object445 compiled to flat fixed point data using 384 vertices in 1ms!
08-08 21:42:02.074: INFO/jPCT-AE(22421): Object 443/object445 compiled to 1 subobjects in 3ms!
08-08 21:42:02.074: INFO/jPCT-AE(22421): Object 'object445' uses one texture set!
08-08 21:42:02.074: ERROR/dalvikvm-heap(22421): 4608-byte external allocation too large for this process.
08-08 21:42:02.074: ERROR/dalvikvm(22421): Out of memory: Heap Size=16859KB, Allocated=16593KB, Bitmap Size=8491KB, Limit=21884KB
08-08 21:42:02.074: ERROR/dalvikvm(22421): Trim info: Footprint=16967KB, Allowed Footprint=17095KB, Trimmed=1248KB
08-08 21:42:02.074: WARN/OSMemory(22421): External allocation of 4608 bytes was rejected
08-08 21:42:02.084: WARN/dalvikvm(22421): threadid=9: thread exiting with uncaught exception (group=0x40025a70)
08-08 21:42:02.094: ERROR/AndroidRuntime(22421): FATAL EXCEPTION: GLThread 12
        java.lang.OutOfMemoryError
        at org.apache.harmony.luni.platform.OSMemory.malloc(Native Method)
        at org.apache.harmony.luni.platform.PlatformAddressFactory.alloc(PlatformAddressFactory.java:150)
        at java.nio.DirectByteBuffer.<init>(DirectByteBuffer.java:66)
        at java.nio.ReadWriteDirectByteBuffer.<init>(ReadWriteDirectByteBuffer.java:51)
        at java.nio.BufferFactory.newDirectByteBuffer(BufferFactory.java:93)
        at java.nio.ByteBuffer.allocateDirect(ByteBuffer.java:68)
        at com.threed.jpct.CompiledInstance.fill(CompiledInstance.java:704)
        at com.threed.jpct.Object3DCompiler.compile(Object3DCompiler.java:136)
        at com.threed.jpct.World.compile(World.java:2051)
        at com.threed.jpct.World.renderScene(World.java:1093)
        at com.ua.cv.abel.dna.wallpaper.DnaRenderer.onDrawFrame(MyRenderer.java:272)


What i should destroy from jpct part in  onSurfaceDestroyed() of Engine ?

ERROR/Surface(239): surface (id=0, identity=22) is invalid, err=-19 (No such device)
and black screen wallpaper

I have the same problem, second run onCreateEngine() of wallpaper service crash;
Somebody can tell right initialization/destroy sequence?
I try next -


onCreateEngine()  {
       return = new MyEngine();
}
//in engine
onCreate(){
      executor = Executors.newSingleThreadExecutor();
}
onDestroy(){
  executor.shutdownNow();
  super.onDestroy();
}
onSurfaceCreated(){
      //init gl/egl
                        EGLConfig config = null;
egl = (EGL10) EGLContext.getEGL();
glDisplay = egl.eglGetDisplay(EGL10.EGL_DEFAULT_DISPLAY);
int[] version = new int[2];
egl.eglInitialize(glDisplay, version);
int[] configSpec = new int[]{EGL10.EGL_DEPTH_SIZE, 16, EGL10.EGL_NONE};// {EGL10.EGL_RED_SIZE, 5, EGL10.EGL_GREEN_SIZE, 6, EGL10.EGL_BLUE_SIZE, 5, EGL10.EGL_DEPTH_SIZE, 16, EGL10.EGL_NONE};
EGLConfig[] configs = new EGLConfig[1];
int[] numConfig = new int[1];
egl.eglChooseConfig(glDisplay, configSpec, configs, 1, numConfig);
config = configs[0];

glc = egl.eglCreateContext(glDisplay, config, EGL10.EGL_NO_CONTEXT, null);
glSurface = egl.eglCreateWindowSurface(glDisplay, config, holder, null);
egl.eglMakeCurrent(glDisplay, glSurface, glSurface, glc);
gl = (GL10) (glc.getGL());
//create renderer
renderer = new MyRenderer();
renderer.onSurfaceCreated(gl, config);
//in renderer.onSurfaceCreated   create word, textures objects etc
}
onSurfaceDestroyed(final SurfaceHolder holder) {
super.onSurfaceDestroyed(holder);
egl.eglMakeCurrent(glDisplay, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_SURFACE, EGL10.EGL_NO_CONTEXT);
egl.eglDestroySurface(glDisplay, glSurface);
egl.eglDestroyContext(glDisplay, glc);
egl.eglTerminate(glDisplay);
mVisible = false;
}
// on surfaceChange & onVisibilityChanged has only logic for call draw command in executor



For 2.49 exporter work good.  Model was made in 2.57, when i try open it in 2.49 blender crash, so i mast use intermediate format for import model to 2.49

I reexport model with animation, change manually vertex count again, after that found null pointer in SkinHelper.asArray(mesh.getTextureCoords().get(0).coords)  (BonesImporter.class) - 0-key value some reason was null, get(1) ... and finally i saw model on screen... but as 1 mesh without submeshes. So i hope next release will be better.
But now i solved the problem in next way - bender 2.57 -> collada .dae -> blender 2.49 (with it ogre exporter) -> create bones etc -> make animation actions/ shape keys -> export to ogre mesh 

You can use UV mapping