Android Modern Examples

Pavl_G · May 5, 2022, 7:01pm

I am currently trying to solve this issue :

Make tests more android friendly

opened 02:01PM - 20 Mar 17 UTC

enhancement Contribution welcome Android

Hey Guys, As I was working on the Tests in the sdk today I discovered that some… tests have dependencies on `jme3-desktop`, which makes them useless for Android. A) TestFancyCar had some old SettingsDialog imports which were unusued actually. See 479392f B) TestMipMapGen: We have two MipMapGenerator's. One in jme3-desktop and one in jme3-core. The Desktop pendant uses AWT, which doesn't work on Android. Technically they should do the same so the question is if there is a valid reason to still keep the one in jme3-desktop? See 10b23db Those commits are only applied to 3.1 because I actually pushed them by mistake (my old git tool always asked for the appropriate remote, for this one you have to set it in the settings), so sorry for the inconvenience. C) TestRenderToMemory uses `jme3-desktop`'s `com.jme3.util.Screenshots`. By looking into Screenshots it seems to me that it only depends on AWT for the Buffers however we already have our own buffer implementations so we might be independent from AWT here? Apart from that `convertScreenShot2` is a horrible name for jme buffer to Image Object and the name `Screenshot` itself is also a bit misleading. I don't know what to do there since I am unfamiliar with the classes, though. D) TestAbsoluteLocators depends on `AWTLoader` for the textures however I don't think it's possible to have some conditional code for Android there? Maybe we could add a TestAbsoluteLocatorsAndroid and the SDK deletes the relevant test? E) The whole `jme3test.awt` package is useless on Android. There are neither Applets nor AWT Canvases to use. The SDK will simply remove the AWT package when creating the Android Tests. Is that okay?

So, this is what i have reached so far :

I still don’t know if this is enough to solve this issue, let me know what would you like to see as an example or a tutorial on android development with jMonkeyEngine and i will add it to this repo ?

If you are currently porting your game to android, let me know if there is a use-case you want to try ?

hints :
Would a Scala and/or Groovy examples be useful ?
Would a lemur example be useful ?
Would a Minie example be useful ?
Would a shader workflow example be useful ?
Or they are more like engine oriented and just gradle ?

EDIT :
This issue is also a similar target (although quite invalid for me, but will be resolved when simple examples are provided for sure) :

github.com/jMonkeyEngine/jmonkeyengine

AndroidNativeImageLoader failing to load

opened 01:49AM - 13 Feb 20 UTC

MeFisto94

Android Documentation

I just tried to start a simple android test application, but the result I got wa…s: ``` java.lang.UnsatisfiedLinkError: dalvik.system.PathClassLoader[DexPathList[[zip file "/data/app/com.github.MeFisto94.android.jme3.test-1/base.apk"],nativeLibraryDirectories=[/data/app/com.github.MeFisto94.android.jme3.test-1/lib/x86, /system/lib, /vendor/lib]]] couldn't find "libdecodejme.so" at java.lang.Runtime.loadLibrary0(Runtime.java:984) at java.lang.System.loadLibrary(System.java:1530) at com.jme3.texture.plugins.AndroidNativeImageLoader.<clinit>(AndroidNativeImageLoader.java:23) at java.lang.Class.classForName(Native Method) at java.lang.Class.forName(Class.java:400) at java.lang.Class.forName(Class.java:326) at com.jme3.asset.AssetConfig.acquireClass(AssetConfig.java:62) at com.jme3.asset.AssetConfig.loadText(AssetConfig.java:86) at com.jme3.asset.DesktopAssetManager.loadConfigFile(DesktopAssetManager.java:96) at com.jme3.asset.DesktopAssetManager.<init>(DesktopAssetManager.java:89) at com.jme3.system.JmeSystemDelegate.newAssetManager(JmeSystemDelegate.java:125) at com.jme3.system.JmeSystem.newAssetManager(JmeSystem.java:139) at com.jme3.app.LegacyApplication.initAssetManager(LegacyApplication.java:216) at com.jme3.app.LegacyApplication.initialize(LegacyApplication.java:593) at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:197) at com.jme3.app.AndroidHarness.initialize(AndroidHarness.java:477) ``` TLDR: Something is wrong with the natives again, I guess. @riccardobl Do we need to do something more than just adding `jme3-android` as dependency? I've only found https://mvnrepository.com/artifact/org.jmonkeyengine/jme3-bullet-native-android but it shouldn't include the Image Loader. Edit: Either this https://github.com/jMonkeyEngine/jmonkeyengine/tree/master/jme3-android-native should be a separate artifact or part of jme3-android as dependency (I strongly guess and suggest the latter), so I guess that's the problem already. Certainly missing that in https://github.com/jMonkeyEngine/jmonkeyengine/blob/master/jme3-android/build.gradle though. Edit2: ### Sorry for the misinformation ### Actually there is a `jme3-android-native` artifact, but I don't think it's what we want, is it? Why would someone omit it? If someone wants to omit it, the `AndroidNativeImageLoader` needs to be shifted to that artifact, so that it's not visible for the DesktopAssetManager

richtea · May 5, 2022, 7:08pm

Not for me exactly, but the template I use for https://start.jmonkeyengine.org/ has trouble with lemur on android (if both lemur and lemur-proto are included android complains when it tries to merge everything) so if you have a working lemur android example that would be helpful for me to use to update the template

Pavl_G · May 5, 2022, 7:14pm

I have started the process of porting Advanced Vehicles to android recently, and yes some components of Lemur was buggy with android and i cannot remember which part (and mostly was incompatible dependencies), but as of Lemur basic setup, it was working !

As of this, i will start building some examples for lemur and will include them on different modules on this repository.

Pavl_G · May 5, 2022, 7:14pm

Okay, what else ?

Pavl_G · May 7, 2022, 7:53am

That’s because guava-19 is a duplicate, you can exclude it from the proto module.

Execution failed for task ':hellolemur:checkDebugDuplicateClasses'.
> A failure occurred while executing com.android.build.gradle.internal.tasks.CheckDuplicatesRunnable
   > Duplicate class com.google.common.util.concurrent.ListenableFuture found in modules jetified-guava-19.0 (com.google.guava:guava:19.0) and jetified-listenablefuture-1.0 (com.google.guava:listenablefuture:1.0)
     
     Go to the documentation to learn how to <a href="d.android.com/r/tools/classpath-sync-errors">Fix dependency resolution errors</a>.

I ran an android test today, lemur works on android, but lemur styles don’t work, due to missing javax.script.ScriptEngineManager from android system :

This exception is raised when trying to use BaseStyles.loadGlassStyle(); :

E/AndroidRuntime: FATAL EXCEPTION: GLThread 7236
    Process: com.jme3.hellojmesurfaceview, PID: 6177
    java.lang.NoClassDefFoundError: Failed resolution of: Ljavax/script/ScriptEngineManager;
        at com.simsilica.lemur.style.StyleLoader.<init>(StyleLoader.java:72)
        at com.simsilica.lemur.style.StyleLoader.<init>(StyleLoader.java:62)
        at com.simsilica.lemur.style.BaseStyles.loadStyleResources(BaseStyles.java:72)
        at com.simsilica.lemur.style.BaseStyles.loadGlassStyle(BaseStyles.java:62)
        at com.jme3.hellojmesurfaceview.MyGame.simpleInitApp(MyGame.java:48)
        at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:240)
        at com.jme3.view.surfaceview.JmeSurfaceView.initialize(JmeSurfaceView.java:294)
        at com.jme3.system.android.OGLESContext.onDrawFrame(OGLESContext.java:344)
        at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1573)
        at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1272)
     Caused by: java.lang.ClassNotFoundException: Didn't find class "javax.script.ScriptEngineManager" on path: DexPathList[[dex file "/data/data/com.jme3.hellojmesurfaceview/code_cache/.overlay/base.apk/classes2.dex", zip file "/data/app/~~c01C2qvFAtlfaA5P1zTbkg==/com.jme3.hellojmesurfaceview-YWYnzg8owki_m9SpjFZMWA==/base.apk"],nativeLibraryDirectories=[/data/app/~~c01C2qvFAtlfaA5P1zTbkg==/com.jme3.hellojmesurfaceview-YWYnzg8owki_m9SpjFZMWA==/lib/arm64, /data/app/~~c01C2qvFAtlfaA5P1zTbkg==/com.jme3.hellojmesurfaceview-YWYnzg8owki_m9SpjFZMWA==/base.apk!/lib/arm64-v8a, /system/lib64, /system/system_ext/lib64, /system/product/lib64]]
        at dalvik.system.BaseDexClassLoader.findClass(BaseDexClassLoader.java:207)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:379)
        at java.lang.ClassLoader.loadClass(ClassLoader.java:312)
        at com.simsilica.lemur.style.StyleLoader.<init>(StyleLoader.java:72) 
        at com.simsilica.lemur.style.StyleLoader.<init>(StyleLoader.java:62) 
        at com.simsilica.lemur.style.BaseStyles.loadStyleResources(BaseStyles.java:72) 
        at com.simsilica.lemur.style.BaseStyles.loadGlassStyle(BaseStyles.java:62) 
        at com.jme3.hellojmesurfaceview.MyGame.simpleInitApp(MyGame.java:48) 
        at com.jme3.app.SimpleApplication.initialize(SimpleApplication.java:240) 
        at com.jme3.view.surfaceview.JmeSurfaceView.initialize(JmeSurfaceView.java:294) 
        at com.jme3.system.android.OGLESContext.onDrawFrame(OGLESContext.java:344) 
        at android.opengl.GLSurfaceView$GLThread.guardedRun(GLSurfaceView.java:1573) 
        at android.opengl.GLSurfaceView$GLThread.run(GLSurfaceView.java:1272)

Ali_RS · May 7, 2022, 9:35am

AFAIK Android does not support runtime compilation of groovy scripts, so I think you must precompile groovy script or rewrite the style in pure java.

Seem there is one for glass style:

gist.github.com

https://gist.github.com/Ali-RS/6195c18ca3333a82e66e9e81118628b4

LemurGuiStyle.java

package com.jayfella.motorunner.lemur;

import com.jme3.asset.AssetManager;
import com.jme3.math.ColorRGBA;
import com.jme3.math.Vector3f;
import com.simsilica.lemur.GuiGlobals;
import com.simsilica.lemur.Insets3f;
import com.simsilica.lemur.Label;
import com.simsilica.lemur.component.QuadBackgroundComponent;
import com.simsilica.lemur.component.TbtQuadBackgroundComponent;

This file has been truncated. show original

Edit:
Note I think this is based on an older version of style file, missing the spinner layout,…

Pavl_G · May 7, 2022, 9:42am

I ran a precompiled groovy and scala before on android, don’t know if android can compile them, but gradle tasks can (you just need to add a compiler call before android tasks) !

Android doesn’t have javax.styles.* package, so have you tested this on android ?

Ali_RS · May 7, 2022, 9:46am

In the gist file I linked there is no javax.styles.*
I have not tested this class, it was created by jayfella.

Pavl_G · May 7, 2022, 9:49am

They are used by lemur on StyleLoader class, and they create problems with android ClassNotFoundExecption :

github.com

jMonkeyEngine-Contributions/Lemur/blob/7ca8f1ee22fedec4979b6548038d3b98efa8b122/src/main/java/com/simsilica/lemur/style/StyleLoader.java#L39


      
          * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
          * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
          * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
          * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
          */
          
          package com.simsilica.lemur.style;
          
          import java.io.*;
          import java.util.*;
          import javax.script.*;
          import com.simsilica.lemur.GuiGlobals;
          import java.net.URL;
          
          
          /**
          *  Uses Groovy to load style definitions using a Groovy-based
          *  styles DSL.  For this loader to operate, the groovy-all jar must
          *  be on the classpath.
          *
          *  @author    Paul Speed

I am sorry it’s javax.script not style

Ali_RS · May 7, 2022, 9:49am

Also there is a gradle pluging for compiling groovy for Android but it is no maintained.

Pavl_G · May 7, 2022, 9:51am

Thanks for sharing, this may be helpful, i was compiling groovy externally with a bash script and then packaging it as a jar and including inside lib folder.

Pavl_G · May 7, 2022, 9:57am

import com.simsilica.lemur.style.Styles;

I am not sure if this uses StyleLoader too, but in general doing :

BaseStyles.loadGlassStyle();

raises a ClassNotFoundException on javax.scripts.ScriptEngineManager

Don’t know if we can ship it manually ?

Ali_RS · May 7, 2022, 9:58am

I think for using the gist file I linked above you do not need to use StyleLoader, just instantiate LemurGuiStyle class and it should apply the style but as said I have never used it before.

Pavl_G · May 7, 2022, 10:14am

Alright, this works fine, you are right, it doesn’t call for javax.script.ScriptManager

Will lemur provides some documentation notes for this ?

EDIT :
But, i think you can omit this heart burn and use jMonkeyEngine textures directly with a QuadBackgroundComponent.

Ali_RS · May 7, 2022, 10:35am

There is a wiki page:

Pavl_G · May 7, 2022, 10:37am

Thank you !

If you know a fix for lemur/lemur-proto duplicate res files please let me know, after that we will have a working example for lemur-proto together besides lemur on android .

Ali_RS · May 7, 2022, 11:10am

Unfortunately, I have no idea about this issue.

pspeed · May 7, 2022, 9:03pm

Note: nothing requires you to use the groovy styles or default styles. You are free to hand-code styles in Java. No groovy required. Just don’t include the style resources and don’t load the glass style. Done.

Pavl_G · May 7, 2022, 9:25pm

Yeah, got it.

I am still searching for this.

pspeed · May 7, 2022, 9:27pm

Others have definitely used Lemur on android before and so must have found a way to exclude files from the apk build or whatever.

…in gradle it should be trivial to exclude things, I would guess.