Diễn giả: Bùi Quốc Việt Đơn vị: AiTi Eduacation

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