my App take a lot of ram ( clear cache when moving between navigation item )

Question

i'm trying to create an application contains different categories and each category contains range of images (All images are downloaded from their links) and i working with Glide Library ,i did all that but have problem with memory ram my application take a lot of memory (The value varies depending on the device) reason of that is when i moving between categories The images are loaded and stored in the cache , how i can fix this issue

this one of fragments .java

public class Art extends Fragment {
GridView myGrid;
CategoryAdapter adapter;

public Art() {
    // Required empty public constructor
}

@Override
public View onCreateView(final LayoutInflater inflater, final ViewGroup   container, Bundle savedInstanceState) {
    final ArrayList<String> movieList =  new ArrayList<>();
    /*Source Art*/
    movieList.add("http://i.imgur.com/INlyb2w.jpg");
    movieList.add("http://i.imgur.com/ZvvBaq8.jpg");
    /*****/

    View v =  inflater.inflate(R.layout.fragment_art, container, false);
    myGrid= (GridView) v.findViewById(R.id.gridViewCategory);
    adapter =new CategoryAdapter(getActivity(),movieList);
    myGrid.setAdapter(adapter);
    myGrid.setOnItemClickListener(new    android.widget.AdapterView.OnItemClickListener() {
        @Override
        public void onItemClick(AdapterView<?> parent, View view, int   position, long id) {
                    Intent popup = new Intent(getActivity(), Pop.class);
                    popup.putExtra("WallpaperURL", movieList.get(position));
                    startActivity(popup);
          }
       });
      return v;
   }
}
 class CategoryAdapter extends BaseAdapter {
  private Context context;
  private ArrayList<String> imageId= new ArrayList<>();
  CategoryAdapter(Context context,ArrayList<String> imageId){
    this.context=context;
    this.imageId=imageId;
 }
 @Override
 public int getCount() {
    return imageId.size();
 }

 @Override
public Object getItem(int position) {
    return imageId.get(position);
}

@Override
public long getItemId(int position) {
    return position;
}
private class ViewHolder{
    ImageView CategoryImage;
    ViewHolder(View view){
        CategoryImage = (ImageView) view.findViewById(R.id.cat_imageView);
    }
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
    View row=convertView;
    ViewHolder holder;
    if(row == null){
        LayoutInflater inflater= (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        row=inflater.inflate(R.layout.picture_item,parent,false);
        holder=new ViewHolder(row);
        row.setTag(holder);
    }
    else{
        holder=(ViewHolder) row.getTag();
    }
    Glide.with(context).load(imageId.get(position)).placeholder(R.drawable.arrw).into(holder.CategoryImage);
    return row;
}

}