The document provides updates on Android development techniques presented at the GDG DevFest in Kathmandu, including tools like Android Studio, Gradle Build System, and the Volley library for networking. It also covers the Google Maps Android API v2 features, staged rollouts, and alpha/beta testing practices for app development. Additional information on app translation services and links to resources is included for further exploration.

1. GDG DevFest @ Kathmandu, Nepal

2. Latest & Interesting updates
#AndroidDev
@pareshmayani

3. Paresh Mayani
Android Developer
Manager, GDG Ahmedabad

4. Interesting updates - #AndroidDev
• Android Studio
• Gradle Build System
• Volley Library
• Google Maps Android API v2
• Staged rollouts
• Alpha and Beta Testing
• Optimization Tips
• App Translation Service
@pareshmayani

5. Android Studio
@pareshmayani

6. Android Studio
• Android focused IDE (designed
specifically for Android development)
• New Android development environment
based on IntelliJ IDEA
• Similar to Eclipse with the ADT Plug-in
• Contains All the Android SDK Tools to
design, test, debug, and profile your app
@pareshmayani

7. Gradle Build System
@pareshmayani

8. Gradle Build System
• Gradle is an advanced build
management system based on Groovy
• Its an Open source build system
• Combines the power of Ant and Maven
@pareshmayani

9. Features of Gradle build system
• Dependency Management (Flexible approach to
dependency management that can reuse existing maven
repositories or reference local JARs)
@pareshmayani

10. Features of Gradle build system
• Dependency Management (Flexible approach to
dependency management that can reuse existing maven
repositories or reference local JARs)
• A single build system (Gradle is the authoritative build
across the IDE and the command-line.)
@pareshmayani

11. Features of Gradle build system
• Dependency Management (Flexible approach to
dependency management that can reuse existing maven
repositories or reference local JARs)
• A single build system (Gradle is the authoritative build
across the IDE and the command-line.)
• Product Flavors (Free & Paid version), Build Variants (Play
store OR Amazon OR Any other store), Build Type (Debug,
QA, Release)
@pareshmayani

12. Features of Gradle build system
• Dependency Management (Flexible approach to
dependency management that can reuse existing maven
repositories or reference local JARs)
• A single build system (Gradle is the authoritative build
across the IDE and the command-line.)
• Product Flavors (Free & Paid version), Build Variants (Play
store OR Amazon OR Any other store), Build Type (Debug,
QA, Release)
• Binary Bundles for Libaries (.aar) (Gradle supports the new
.aar binary bundle format for the library projects)
@pareshmayani

13. Volley – “the simultaneous firing of a
number of missiles”
@pareshmayani

14. Android – Volley library
“Volley is a library that makes networking for
Android apps easier and most importantly, faster.”
@pareshmayani

15. Advantages of using Volley Library
• Volley automatically schedule all network requests.
Volley will be taking care of all the network requests your app
executes for fetching response or image from web.
• Volley provides powerful customization abilities.
• Volley provides Debugging and tracing tools.
• Volley provides powerful cancellation request API.
- You can cancel a single request or
- You can set blocks or scopes of requests to cancel.
@pareshmayani

16. How to get started?
1. Clone the Volley project
2. Import the code into your project
@pareshmayani

17. Clone the Volley Project
git clone
https://android.googlesource.com/platform/frameworks/volley
@pareshmayani

18. 2 Main classes of Volley Library
2 main classes
Request queue
It is the interest you use for
dispatching requests to the
network
It contains all the
necessary details for
making web API call
Request
@pareshmayani

19. Take a look at JsonObjectRequest
JsonObjectRequest ObjJsonRequest = new JsonObjectRequest(Request.Method.GET, url, null, new
Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
// Successful response
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
// Failure response
}
});
@pareshmayani

20. Basic Example
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
public class MainActivity extends Activity {
@Override
protected void onCreate(Bundle savedInstanceState) {
……
…...
RequestQueue queue = Volley.newRequestQueue(this);
String url = “Web API URL”;
// Prepare JSON Object request
queue.add(ObjJsonRequest );
}
@pareshmayani

21. Google Maps API v2
@pareshmayani

22. Google Maps Android API v2
• With v2 of Maps Android API, you can embed maps into an
activity as a fragment
@pareshmayani

23. Google Maps Android API v2
• With v2 of Maps Android API, you can embed maps into an
activity as a fragment
• The API is now distributed as part of the Google Play
services SDK
@pareshmayani

24. Google Maps Android API v2
• With v2 of Maps Android API, you can embed maps into an
activity as a fragment
• The API is now distributed as part of the Google Play
services SDK
• Maps are now 3D
@pareshmayani

25. Google Maps Android API v2
• With v2 of Maps Android API, you can embed maps into an
activity as a fragment
• The API is now distributed as part of the Google Play
services SDK
• Maps are now 3D
• The Maps API now uses vector tiles. Their data
representation is smaller, so maps appear in your apps faster,
and use less bandwidth.
@pareshmayani

26. Google Maps Android API v2
• With v2 of Maps Android API, you can embed maps into an
activity as a fragment
• The API is now distributed as part of the Google Play
services SDK
• Maps are now 3D
• The Maps API now uses vector tiles. Their data
representation is smaller, so maps appear in your apps faster,
and use less bandwidth.
• Caching is improved
@pareshmayani

27. Getting started with Map API v2
Step - 1 Install and Set up the Google Play Service SDK
@pareshmayani

28. Getting started with Map API v2
Step - 2 Run the sample
Once you've installed the Google Play services package, the
Google Maps sample is located in
<android-sdk>/extras/google-play-services/samples/maps
@pareshmayani

29. Basic example
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent" >
<fragment
android:id="@+id/map"
android:name="com.google.android.gms.maps.MapFragment"
android:layout_width="match_parent"
android:layout_height="match_parent"/>
</RelativeLayout>
public class BasicMapActivity extends FragmentActivity {
/**
* Note that this may be null if the Google Play services APK is not available.
*/
private GoogleMap mMap;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.basic_demo);
mMap = ((SupportMapFragment) getSupportFragmentManager().findFragmentById(R.id.map))
.getMap();
}
@pareshmayani

30. Placing Marker
// latitude and longitude
double latitude = ;
double longitude = ;
// create marker
MarkerOptions marker = new MarkerOptions().position(new LatLng(latitude, longitude)).title(“Hello World!");
// adding marker
googleMap.addMarker(marker);
@pareshmayani

31. Placing Marker
private static final LatLng AHMEDABAD= new LatLng(23.0300, 72.5800);
// Uses a colored icon.
Marker mBrisbane = mMap.addMarker(new MarkerOptions()
.position(AHMEDABAD)
.title(“Ahmedabad")
.snippet("Population: 5.571 million ")
.icon(BitmapDescriptorFactory.defaultMarker(BitmapDescriptorFactory.HUE_AZURE)));
// Uses a custom icon.
Marker mSydney = mMap.addMarker(new MarkerOptions()
.position(AHMEDABAD)
.title(“Ahmedabad")
.snippet("Population: 5.571 million ")
.icon(BitmapDescriptorFactory.fromResource(R.drawable.arrow)));
// Creates a draggable marker. Long press to drag.
Marker mMelbourne = mMap.addMarker(new MarkerOptions()
.position(AHMEDABAD)
.title(“Ahmedabad")
.snippet("Population: 5.571 million ")
.draggable(true));
@pareshmayani

32. Staged Rollouts
@pareshmayani

33. Staged Rollouts
• With a staged rollout, you can
publish your app to a certain
percentage of the market first to
make sure that your app works
properly before rolling it out to
everybody.
• Users receiving the staged
rollout can leave public reviews
in Google Play.
@pareshmayani

34. Staged Rollouts
Step - 1 Publish APK as staged rollout
@pareshmayani

35. Staged Rollouts
Step - 2 Publish app to certain percentage
@pareshmayani

36. Alpha and Beta Testing
@pareshmayani

37. Alpha and Beta Testing
• Google Play Developer console
allows you to test two different
version of your app at the same
time in addition to your production
version.
• It’s FREE
• Testing by real users before app
goes live
@pareshmayani

38. Alpha and Beta Testing
Step - 1 Upload new APK to Beta/Alpha
@pareshmayani

39. Alpha and Beta Testing
Step - 2 Publish now to Beta/Alpha
@pareshmayani

40. Alpha and Beta Testing
Step - 3 Selecting groups of testers
@pareshmayani

41. Alpha and Beta Testing
Move to Alpha/Beta/Production
@pareshmayani

42. Google Play ServicesOptimization Tips
@pareshmayani

43. Optimization Tips
@pareshmayani

44. Optimization Tips
@pareshmayani

45. App Translation Service
@pareshmayani

46. App Translation Service
• Google Play can help you quickly find and purchase
translations of your app.
• In the Developer Console, you can browse a list of third-
party vendors who are pre-qualified by Google to offer high-
quality translation at competitive prices.
Steps:
1. Upload the strings you want translated, select the
languages you want to translate into.
2. Select your translation vendor based on time and price.
@pareshmayani

47. Links
1. https://github.com/PareshMayani/Android-Volley-Example
2. https://developers.google.com/maps/documentation/andro
id/
3. http://developer.android.com/distribute/googleplay/publish
/localizing.html#gp-trans
@pareshmayani

48. Paresh Mayani
Manager, GDG Ahmedabad
Android Developer
pareshmayani@gmail.com
@pareshmayani
< Stay in Touch >