The document discusses memory management in Android apps, focusing on heap size and garbage collection strategies. It outlines varying heap size limits across different devices and describes the evolution of garbage collection techniques from pre-Gingerbread to versions beyond Gingerbread. References for further reading and contact information are also provided.

1. 
Memory Management
For Android Apps

2. Who am I ?
Faculty at Aiti-Aptech
Android leader at Zoo Studio

3. What will I share today ?
 Heap size
 Garbage Collection
 Bitmap management

4. 290 MB
2GB

6. Heap size
 Heap size Limits.
G1 : 16MB
Nexus One : 32MB
Galaxy S3 : 64MB

8. Heap size
 Honeycomb (3.0) support option :
 “largetHeap”
 ActivityManager.getLargeMemoryClass()

9. Garbage Collection

10. Garbage Collection
 Bigger heaps = longer pauses
 Pre- Gingerbread
 Stop all application
 Pause time > 100ms
 Gingerbread and beyond
 Concurrent
 Pause times < 5ms

11. Bitmap
 Pre Android 2.3
 Freed via recycle()
 Full, Stop the world GCs

12. Bitmap
 > Android 2.3
 Freed synchronously by GC
 Concurrent & partial GCs

13. GC_FOR_ALLOC freed <1K, 5% free 4961K/5176K,
paused 13ms, total 13ms
GC_CONCURRENT freed 0K, 5% free 4961K/5176K,
paused 8ms+0ms, total 10ms
GC_FOR_ALLOC freed 2418K, 45% free
3192K/5788K, paused 1ms, total 1ms

14. References
 http://android-developers.blogspot.com/2011/03/memory-
analysis-for-android.html.
 http://kohlerm.blogspot.com/2009/02/memory-leaks-are-
easy-to-find.html
 http://developer.android.com/training/displaying-
bitmaps/manage-memory.html

15. Thank you !!!
 Email : vietbq@moneylover.me