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Editorial Team
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Asked: 2026-05-27T16:41:48+00:00

I have made a demo activity. i.e a simple Activity with a layout and

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I have made a demo activity. i.e a simple Activity with a layout and a TextView.

I have used 

Log.e(kFileString, "Native Heap Allocated Size = "
    + Debug.getNativeHeapAllocatedSize());
Log.e(kFileString, "Native Heap Free Size = "
    + Debug.getNativeHeapFreeSize());
Log.e(kFileString, "Native Heap SIZE = " + Debug.getNativeHeapSize());

for logging the native heap assigned.

I noticed that each time I change the orientation the allocated native heap is increased.

Can someone please tell me why this happens and if there is any documentation about the Android native heap management?

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1 Answer

  1. Editorial Team

    I just ran a sample application and changed the orientation a couple of times with your log lines added in my onCreate().

    It kept allocation more and more Heap memory but once the Garbage Collector ran I was back to almost the same Heap size I started from.

    Here is the log output:

    12-22 15:35:04.403: D/ISA(15592): Native Heap Allocated Size = 5720352
12-22 15:35:04.423: D/ISA(15592): Native Heap Free Size = 9952
12-22 15:35:04.433: D/ISA(15592): Native Heap SIZE = 5730304
12-22 15:35:15.764: D/ISA(15592): Native Heap Allocated Size = 5802312
12-22 15:35:15.764: D/ISA(15592): Native Heap Free Size = 9912
12-22 15:35:15.774: D/ISA(15592): Native Heap SIZE = 5812224
12-22 15:35:19.558: D/ISA(15592): Native Heap Allocated Size = 5821688
12-22 15:35:19.568: D/ISA(15592): Native Heap Free Size = 11016
12-22 15:35:19.568: D/ISA(15592): Native Heap SIZE = 5832704
12-22 15:35:22.941: D/ISA(15592): Native Heap Allocated Size = 5841120
12-22 15:35:22.941: D/ISA(15592): Native Heap Free Size = 12064
12-22 15:35:22.951: D/ISA(15592): Native Heap SIZE = 5853184
12-22 15:35:25.243: D/ISA(15592): Native Heap Allocated Size = 5860416
12-22 15:35:25.243: D/ISA(15592): Native Heap Free Size = 9152
12-22 15:35:25.243: D/ISA(15592): Native Heap SIZE = 5869568
12-22 15:35:28.316: D/ISA(15592): Native Heap Allocated Size = 5879752
12-22 15:35:28.316: D/ISA(15592): Native Heap Free Size = 10296
12-22 15:35:28.316: D/ISA(15592): Native Heap SIZE = 5890048
12-22 15:35:30.568: D/ISA(15592): Native Heap Allocated Size = 5899064
12-22 15:35:30.568: D/ISA(15592): Native Heap Free Size = 11464
12-22 15:35:30.568: D/ISA(15592): Native Heap SIZE = 5910528
12-22 15:35:32.300: D/ISA(15592): Native Heap Allocated Size = 5918416
12-22 15:35:32.300: D/ISA(15592): Native Heap Free Size = 12592
12-22 15:35:32.300: D/ISA(15592): Native Heap SIZE = 5931008
12-22 15:35:34.262: D/ISA(15592): Native Heap Allocated Size = 5937696
12-22 15:35:34.272: D/ISA(15592): Native Heap Free Size = 9696
12-22 15:35:34.282: D/ISA(15592): Native Heap SIZE = 5947392
12-22 15:35:36.194: D/ISA(15592): Native Heap Allocated Size = 5956976
12-22 15:35:36.204: D/ISA(15592): Native Heap Free Size = 10896
12-22 15:35:36.204: D/ISA(15592): Native Heap SIZE = 5967872
12-22 15:35:37.455: D/ISA(15592): Native Heap Allocated Size = 5976216
12-22 15:35:37.455: D/ISA(15592): Native Heap Free Size = 12136
12-22 15:35:37.455: D/ISA(15592): Native Heap SIZE = 5988352
12-22 15:35:39.387: D/ISA(15592): Native Heap Allocated Size = 5995496
12-22 15:35:39.387: D/ISA(15592): Native Heap Free Size = 13336
12-22 15:35:39.387: D/ISA(15592): Native Heap SIZE = 6008832
12-22 15:35:41.129: D/ISA(15592): Native Heap Allocated Size = 6018880
12-22 15:35:41.139: D/dalvikvm(1606): GC_CONCURRENT freed 1769K, 51% free 4277K/8583K, external 4127K/5154K, paused 18ms+14ms
12-22 15:35:41.139: D/ISA(15592): Native Heap Free Size = 14528
12-22 15:35:41.139: D/ISA(15592): Native Heap SIZE = 6033408
12-22 15:35:47.055: D/ISA(15592): Native Heap Allocated Size = 5829472
12-22 15:35:47.065: D/ISA(15592): Native Heap Free Size = 199840
12-22 15:35:47.065: D/ISA(15592): Native Heap SIZE = 6033408
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