How to avoid OutOfMemory Error / OOM (The Ugly Truth Revealed)

SDK Version: 

ERROR/dalvikvm-heap(4204): 691456-byte external allocation too large for this process.
01-25 22:13:18.694: ERROR/(4204): VM won't let us allocate 691456 bytes 01-25 22:13:18.694

If you have ever got the message above, you are at the right place.

First of all the reason:
Heap size != External Memory size

Dalvik's external memory is limited to ~ 4MBs for each process (That is the Ugly Truth). If it overflows, you get the BitmapFactory.DecodeFile Error.
That's why even if you have like 2MB-s heap memory free, VM won't let you allocate ~700KB.
Since you can't modify external memory's size, you have to reduce your memory usage. This is the only solution I have, but it really works at least.

The solution:

Let say you have a nice big Gallery with lots of large images. An ImageAdapter class will provide all of the images that you are going to use. Therefore you'll need a List of ImageViews.

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