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Code-A-Thon 2019

Intermediate Android Development

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Network Information

The important things

  • WiFi: Guest_BYOD

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Instructor Intro

  • Ila Hur
  • Android Developer at Capital One
  • Mobile Development for ~5 years
  • Education
    • Bachelors - Meredith College
    • Masters - George Mason University
  • Hobbies
    • Photography
    • Reading + Learning
    • Gaming
    • Traveling

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Our TAs

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Outline

  • What we’re building
  • What to expect
  • Topics
    • Networking + AlertDialog
    • GeoCoder
    • Recycler View
    • Intents + Parcelables

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Let’s get started

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What we’re building

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What to expect

  • There are 4 main parts based on the Topics
  • Each part has an Exercise and Solution branch
    • Exercise branches contain a number TODOs to help guide you through the implementation process
    • Solution branches contain my solution as an example
      • Note: Your solution might be different and that is completely okay
  • By the end of this session, we will have a working Weather App that has a list of locations that navigate to the respective details page
  • Repo
  • One additional requirement - use Java 8

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Networking & Alert Dialogs

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Branches

  • Exercise
    • (Open) Step1_Networking_Exercise
    • (C1 Internal) StepOne_Networking_Exercise
  • Solution
    • (Open) Step1_Networking_Solution
    • (C1 Internal) StepOne_Networking_Solution

​

git checkout “<branch name>”

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Volley

  • “Volley is an HTTP library that makes networking for Android apps easier and most importantly, faster”
  • Benefits
    • Automatic scheduling of network requests.
    • Multiple concurrent network connections.
    • Transparent disk and memory response caching with standard HTTP cache coherence.
    • Support for request prioritization.
    • Cancellation request API. You can cancel a single request, or you can set blocks or scopes of requests to cancel.
    • Ease of customization, for example, for retry and backoff.
    • Strong ordering that makes it easy to correctly populate your UI with data fetched asynchronously from the network.
    • Debugging and tracing tools.

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Requesting Permissions

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DarkSky API

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Alert Dialogs

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Geocoder

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Branches

  • Exercise
    • (Open) Step2_Geocoder_Exercise
    • (C1 Internal) StepTwo_GeoCoder_Exercise
  • Solution
    • (Open) Step2_Geocoder_Solution
    • (C1 Internal) StepTwo_GeoCoder_Solution

​

git checkout “<branch name>”

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Geocoder

  • A class for handling geocoding and reverse geocoding.
  • Geocoding
    • The process of transforming a street address or other description of a location into a (latitude, longitude) coordinate.
  • Reverse geocoding
    • The process of transforming a (latitude, longitude) coordinate into a (partial) address.

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RecyclerViews

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Branches

  • Exercise
    • (Open) Step3_RecyclerView_Exercise
    • (C1 Internal) StepThree_RecyclerView_Exercise
  • Solution
    • (Open) Step3_RecyclerView_Solution
    • (C1 Internal) StepThree_RecyclerView_Solution

​

git checkout “<branch name>”

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RecyclerViews

  • If your app needs to display a scrolling list of elements based on large data sets (or data that frequently changes), you should use RecyclerView
  • More advanced and flexible version of ListView
  • Main Components
    • RecyclerView
      • LayoutManager - either LinearLayoutManager or GridLayoutManager
    • Adapter
    • ViewHolder

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Library Dependency

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In XML

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Code Implementation

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Code Implementation

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Getting the Icons for Displaying

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Intents & Parcelables

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Branches

  • Exercise
    • (Open) Step4_IntentsParcelable_Exercise
    • (C1 Internal) StepFour_Intents_Parcelables_Exercise
  • Solution
    • (Open) Step4_IntentsParcelable_Solution
    • (C1 Internal) StepFour_Intents_Parcelables_Solution

​

git checkout “<branch name>”

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Intents

  • An Intent is an abstract description of an operation to be performed
  • Used to launch an Activity, with BroadcastReceiver, and to communicate with a background Service
  • Structure
    • Action - A general action to be performed
    • Data - The data to operate on expressed as a Uri

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Parcelable

  • Interface for classes that can be written to and restored from a Parcel object
  • What’s a Parcel?
    • It’s a container for a message, in the form of data and object references, that can be sent through an IBinder.
    • It can contain both flattened data that will be unflattened and references to live IBinder objects to result in the “other side” receiving a proxy IBinder connected with original IBinder in Parcel
    • What’s an IBinder?
      • Base interface for a remotable object, the core part of a lightweight remote procedure call mechanism for high performance with in-process and cross-process calls

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Shortcut to Creating a Parcelable Object

Android Studio > Preferences > Plugins

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Summary

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Learn More

August 14th & 15th, 2019

androidsummit.org

August 9, 2019

iosdevcampdc.com