Welcome to the community! How exactly are you adding CesiumJS to your Android Application? Do you think that this is an app development issue or a Cesium data issue?
The error you are receiving,
ERR_ACCESS_DENIED, indicates that you are trying to access Cesium 3D Tile data without the required permissions. If you are looking to tile and store your data locally, you can find more information about that here:
Generally, tiling and storing data locally is only recommended for very particular use cases.