Android-处理下载的图像文件的最佳方法

Question

I am building an app that shows user's FB friends' location on a map with their profile pic as the map marker icon.

After downloading friends' pics, I stored them on ArrayList on a global application object and then show them on the map. I've realized that I am spending a lot of heap memory for doing that.

I guess the right way to do it will be by storing them on the external storage, but I am not sure how to do it. Or maybe use SQLite database.

So my question is, what is the most efficient way to do that process? keep in mind that when a user's friend connect to the app, the app should show him on the map in real time.

Answer 1

Using ArrayList to store images does not scale very well, a better approach would be to store them in a database using Blob as described here:

How to save images into Database

Another way of doing this if you're not too comfortable with object persistance, is saving your images to filesystem and simply storing in a database table the pathnames to the images, so you can retrieve them when needed.