Post on 13-Apr-2017
Chris Ripple | Program Manager
Performance & Profiling Tips
Session OverviewProfiling / Sampling
Method profiling
View Heap
Memory Allocations
Performance / Profiling Tools
Android SDK DDMS
Android Studio
History
AndroidBest
PracticesAndroid
JavaAndroidLayout AsyncTask
About the App
Team Xuni12 Developers in 6 Countries
Pittsburgh Shanghai
Sprint Planning App
2x sprints a day…
…in 30 mins…
…anywhere.
Slow scrolling
Slow animation
App crashes
GOALS: To plan… BUGS:
Performance & Profiling Tools First, identify the problem.
Profiling What is Profiling?
o Analyzing behavior in runtimeo CPU utilizationo Memory and I/O analysiso Measurement of time and space
Why do we need it?o Avoid guessworko Quickly identify performance pitfalls
Android Profiling Tools
• Heap view• Memory alloc• Method profiling• Logcat• File explorer• Examine threads• Network traffic
• View hierarchy• Emulate calls• System info
• CPU• GPU• FPS
• Allocation Tracker• Memory monitor• Android Memory Viewer• GPU monitor• CPU monitor• Network monitor
Android SDKDDMS
Android Profiling Tools
• Method profiling• Heap view• Memory allocations
• Allocation Tracker• Memory monitor
Android SDKDDMS
DDMS Method profiling Sample-based profiling
o Interrupt VM at sampling frequency at collection call stackso Overhead proportional to frequency
Trace-based profilingo Trace entry and exit of every methodo High overhead
Start Record, Perform Action, Stop Record Timeline vs Traceview panel views
DDMS – Memory tracking
Total available heap space Total space allocated Total space free % Used Total # Objects Object allocation per size
List of all allocations Allocation order Allocation size Class / Stacktrace Thread Id Allocated In
Heap View Allocation Tracker
Best Practices
Java Android Best Practices Recycling / Object Pooling Pattern ( Scrolling, Animation, Games) General Caching (Images / resources) Optimized Data Containers (SparseArray vs HashMap) Primitives (Integer vs Float 2x slower) Avoid enums Utilize static / final keywords (static 15%-20% faster) Avoid internal getters / setters (direct field access 3x faster)
Layout Best Practices RecyclerView (replaces ListView and GridView)
o setHasFixedSizeo Data updates (notifyDataSetChanged)o Layout updates (notifyItemChanged / Inserted / Removed)
<include> tag (easy code reuse of common layouts) <merge> tag (avoid extra ViewGroups on inflation) TextView Compound Drawables (add images to TextView)
AsyncTask: Why and What
Why use async? Avoid locking main UI Thread
o Lago App crash
What should be async? Network access Image loading Image resizing File access
AsyncTask: How
onPreExecute
doInBackground
onPostExecute
onProgressUpdate
UI Thread
UI Thread
UI Thread
SummaryProfiling / Sampling
Method profiling
View Heap
Memory Allocations
Performance / Profiling Tools
Android SDK DDMS
Android Studio
History
AndroidBest
PracticesAndroid
JavaAndroidLayout AsyncTask
More Resources
Read Android SDK developer.android.com
Follow Official Android Blog android-developers.blogspot.com
Follow GrapeCity Xuni Blog goxuni.com/blog
Questions?