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I did a test on Android 4.4 Kit Kat where i allocated 100MB, and checked the process memory via adb shell dumpsys meminfo -d and saw the Dalvik Heap breakdown: Heap Size and Heap Alloc increased.

I also checked system memory via adb shell cat /proc/meminfo and saw how much free memory it has.

Then i released the memory (and even called System.gc() after).

I then checked the process memory again and saw that in Dalvik Heap breakdown Heap Size remains the same, Heap Alloc decreased and Heap Free increased!

I also run adb shell cat /proc/meminfo and saw that the system didn't reclaim any memory! I don't understand what's going on.

When i did the same test on Android 7.1 and Android 5.0, the memory was reclaimed upon releasing it!

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