NativeMedia sample: use application's assetManager

[ggfan]

This is to fix issue #571:
should use application's assetManager, not Activity's assetManager to avoid being garbage collected

[ggfan]

@adamlesinski, please take a look, thank you so much!

[adamlesinski]

This doesn't quite solve it. You are still accessing the same AssetManager, but more importantly, a reference to the AssetManager isn't being taken.

I think what really needs to change is android_fopen_set_asset_manager. That method should change to be something like:

AAssetManager* android_asset_manager = NULL;
jobject android_java_asset_manager = NULL;
void android_fopen_set_asset_manager(JNIEnv* env, jobject assetManager) {
   android_java_asset_manager = (*env)->NewGlobalRef(env, assetManager);
   android_asset_manager = AAssetManager_fromJava(env, android_java_asset_manager);
}

[ggfan]

@adamlesinski please review again:

• like to keep the jni related logic to be on file-operation's client side
• release it at the shutdown (the vm is the same as the one creating it)

Question: then on Java side, is it still necessary to take assetManager from application ( not activity )?
thanks!

[adamlesinski]

It would be worthwhile, yes. I commented on the commit.