AssetManager is not working from NDK

Question

I am working with OpenGL ES 3.0 and using Eclipse NDK for rendering volume data with Google Nexus. I am using AssetManager for loading the volume data which is a raw file of 16 MB to the real device but it's not working. I stored the resource in the Asset folder included headers too but still i am receiving the same error in logcat __load_uniform_float:802>:GL_INVALID_OPERATION I tried to Google some related examples but couldn't find any. Here is my code: ``` int LoadVolume() { GLubyte *pdata; const unsigned int BUFFER_SIZE = XDIM*YDIM*ZDIM; GLubyte buffer[BUFFER_SIZE]; AAssetManager*mgr; AAsset* asset=AAssetManager_open(mgr,"Engine256.raw",AASSET_MODE_BUFFER); if(!asset) { __android_log_print(ANDROID_LOG_ERROR, "TAG", "_ASSET_NOT_FOUND_"); return 0; } pdata=(GLubyte*)AAsset_read(asset,buffer,BUFFER_SIZE); AAsset_close(asset); glGenTextures ( 1,&textureId ); glBindTexture ( GL_TEXTURE_3D,textureId ); glTexImage3D ( GL_TEXTURE_3D, 0, GL_RED,XDIM, YDIM, ZDIM, 0, GL_RED, GL_UNSIGNED_BYT…

Accepted Answer

If you look at these two lines:

```
AAssetManager*mgr;
AAsset* asset=AAssetManager_open(mgr,"Engine256.raw",AASSET_MODE_BUFFER);
```

You're declaring `mgr` as a pointer variable, but you don't assign a value to it. Then you use it on the next line, while it's uninitialized.

You need to pass an `AssetManager` object from your Java code into the native code through your JNI interface, and then obtain the `AAssetManager` by using this call, where `assetManager` is the Java object passed in, which comes into the native code as a `jobject` type parameter.

```
AAssetManager *mgr = AAssetManager_fromJava(env, assetManager);
```

This question/answer show in some more detail how to pass the Java object to the native code: Can't access AAssetManager in native code passed from Java in WallpaperService.

AssetManager is not working from NDK

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