1.
7 to 9 years
@brwngrldev

2.
What’s Involved:
• Major in Math/Science
• Take the MCAT
• Go to Medical School
• Take the USMLE Step 1
• Do Rotations
• Take the USMLE Step 2
@brwngrldev

3.
What’s Involved:
• Major in Math/Science
• Take the MCAT
• Go to Medical School
• Take the USMLE Step 1
• Do Rotations
• Take the USMLE Step 2
• Complete Internship
• Do Residency
• Take the USMLE Step 3
• Take the Board Exams
• Do a Fellowship
@brwngrldev

4.
How can I become
an Android
Developer?
@brwngrldev

5.
How can I become a
great Android
Developer?
@brwngrldev

6.
Newsletters

7.
Podcasts

8.
Online Courses
• At your own pace
• All aspects of development
• Different perspectives

9.
Online Courses - Udacity

10.
Online Courses - Caster.IO

11.
“If you associate
with eagles, you will
learn how to soar…”
- Ojo Michael E.

12.
Conferences
• Hear from the Experts
• Grow your Network
• Learn new Techniques

13.
Conferences

14.
Open Source
• Countless Examples
• Learn by Doing
• Design Patterns in Action

15.
Open Source
@brwngrldev

16.
Open Source
@brwngrldev

17.
Open Source

18.
Study
• Newsletters
• Podcasts
• Online Courses
• Conferences
• Open Source
@brwngrldev

19.
Prevention
• Static Code Analysis
• Code Reviews
• Leak Canary
• Automated Testing
• API Testing
@brwngrldev

20.
Static Code Analysis
Lint
Checkstyle
FindBugs
PMD
@brwngrldev

21.
Static Code Analysis
0
40
80
120
160
Checkstyle FindBugs PMD Error Prone Lint
@brwngrldev

22.
Static Code Analysis - FindBugs

23.
Static Code Analysis - FindBugs

24.
Code Reviews

25.
Code Reviews

26.
Code Reviews

27.
Code Reviews
• Catch Issues
• Gain Exposure to New Ideas
• Promotes Consistent Design
• Ensures Maintainability

28.
Code Reviews

29.
Leak Canary
debugCompile “…:leakcanary-android:$leak”
releaseCompile “…:leakcanary-android-no-op:$leak”
testCompile “…:leakcanary-android-no-op:$leak”
@brwngrldev

30.
Leak Canary
private BooksAdapter booksAdapter;
@Bind(R.id.recyclerView)
RecyclerView recyclerView;
private static Toolbar toolbar;
private BooksPresenter booksPresenter;
@brwngrldev

31.
Leak Canary
@brwngrldev

32.
Architecture

33.
Architecture
Foo Foo Bar
Baz

34.
MVP + Dagger
@brwngrldev

35.
Clean Architecture
@brwngrldev

36.
Automated Testing
https://martinfowler.com/bliki/TestPyramid.html

37.
@brwngrldev

38.
Continuous Integration
@brwngrldev

39.
API Testing

40.
API Testing - Postman

41.
API Testing - Postman
1.Send Requests
2.Receive Response
3.Run Test Scripts

42.
Sending Requests

43.
API Response
[
{
"userId": 1,
"id": 1,
"title": "sunt aut facere repellat",
"body": "quia et suscipitnsuscipit recusandae"
},
{
"userId": 1,
"id": 2,
"title": "qui est esse",
"body": "est rerum tempore vitaensequi sint"
}
] https://jsonplaceholder.typicode.com

44.
Test - Status Code
tests["Status code is 200"] =
responseCode.code === 200;
@brwngrldev

45.
Test - Schema
var schema = {
"type": [“array”, “null”]
};
var jsonData = JSON.parse(responseBody);
tests["Valid Schema"] =
tv4.validate(jsonData, schema);
@brwngrldev

46.
IT GETS
BETTER
@brwngrldev

47.
Test - Schema
@brwngrldev
{
"userId": 1,
"id": 1,
"title": "sunt aut facere repellat provident",
"body": "quia et suscipitnsuscipit recusandae"
}

48.
Test - Schema
var postSchema = {
"type" : "object",
"properties" : {
"userId": { "type" : "integer" },
"id": { "type" : "integer" },
"title": { "type" : "string" },
"body" : { "type" : "string" }
}
};
@brwngrldev

49.
API Testing

50.
Set Up Monitors

51.
Prevention
• Static Code Analysis
• Code Reviews
• Leak Canary
• Automated Testing
• API Testing
@brwngrldev

52.
74 year old
stomach pain
34 year old
stomach pain
@brwngrldev

53.
@brwngrldev

54.
LET’S
SHARE
@brwngrldev

55.
Code Outside
InsideEmulator

56.
CODE
@brwngrldev

57.
@Override
public void onFailure(Call<Book> call, Throwable t)
{
bus.post(new BookLoadingErrorEvent(id));
Timber.e(t, "Unable to load the book data from API.");
}
Write Logs

58.
Logcat/Pidcat

59.
Log Events
public void trackEvent(String event)
{
analytics.track(event);
if (Fabric.isInitialized())
{
Crashlytics.log(event);
}
}

60.
Crashlytics

61.
OUTSIDE
@brwngrldev

62.
Crashlytics

63.
Crashlytics

64.
Classy Shark

65.
Classy Shark

66.
Battery Historian

67.
Battery Historian

68.
Battery Historian

69.
…Battery Citizen

70.
mitmproxy
https://mitmproxy.org/doc/howmitmproxy.html

71.
mitmproxy
https://mitmproxy.org/doc/howmitmproxy.html

72.
mitmproxy
brew install python3
pip3 install mitmproxy
mitmproxy --host
@brwngrldev

73.
mitmproxy

74.
mitmproxy

75.
Systrace

76.
Systrace
Alerts Pane

77.
Systrace
Alert Detail

78.
INSIDE
@brwngrldev

79.
Apk Analyzer

80.
Android Profiler

81.
Android Profiler

82.
Android Profiler

83.
Android Profiler
http://tools.android.com/tech-docs/android-profiler

84.
EMULATOR
@brwngrldev

85.
Android Options:
GPU Overdraw
blue -> green -> light red -> dark red
(1x) (4x or more)

86.
Android Options:
GPU Overdraw
@brwngrldev

87.
Android Options:
Profile GPU Rendering
16 milliseconds
@brwngrldev

88.
Android Options:
Profile GPU Rendering
https://developer.android.com/studio/profile/dev-options-rendering.html

89.
Diagnosis

90.
Resources
• http://www.kotlinweekly.net - Kotlin Weekly
• http://androidweekly.net - Android Weekly
• https://www.androiddevdigest.com - Android Dev Digest
• http://www.adavis.info/2015/07/android-devs-listen-up.html - Podcasts
• https://www.udacity.com - Udacity
• https://caster.io - Caster.IO
• http://androidstudygroup.github.io/conferences - Android Conferences

91.
Resources
• http://findbugs.sourceforge.net - FindBugs
• https://github.com/square/leakcanary - Leak Canary
• https://www.getpostman.com - Postman
• https://github.com/JakeWharton/timber - Timber
• https://github.com/JakeWharton/pidcat - Pidcat
• https://fabric.io/kits/android/crashlytics - Crashlytics
• https://www.lynda.com/trial/AnnyceDavis - Lynda.com

92.
Resources
• https://github.com/google/android-classyshark - ClassyShark
• https://github.com/google/battery-historian - Battery Historian
• http://docs.mitmproxy.org/en/latest/mitmproxy.html -mitmproxy
• https://developer.android.com/studio/profile/systrace.html - Systrace
• https://developer.android.com/studio/build/apk-analyzer.html - APK Analyzer
• http://www.adavis.info/2015/03/android-overdraw-what-is-it-and-why.html - Overdraw
• https://developer.android.com/studio/profile/dev-options-rendering.html - GPU Rendering