Mercandj

Swift 4 - List of listeners

Note: I'm an Android developer that trying to create iOS apps. So I may be missing some notions. Sorry for that.

Problem

In many managers and buisness classes, we could want to have a listeners mechanism (sometimes called events) with some notions to register (or addListener), unregister (or removeListener) and notify (or broadcast) all the listeners registered.

So the problem is the following: "How to create an implementation of the following contract bellow".

Mercandj

ViewPager

Track ViewPager position

Mercandj

#!/usr/bin/env bash

ANDROID_SERIAL_NUMBER=$1

if [[ "$ANDROID_SERIAL_NUMBER" = "" ]] ; then
    printf "Missing android serial number after the command.
    To get it -> adb devices: \n"
    adb devices
    exit 0
fi

Mercandj

#!/usr/bin/env bash

DEVICE=$1
URL=$2

if [[ "$DEVICE" = "" ]] ; then
    printf "Missing device arg\n"
    printf "First arg should be the device\n"
    printf "Second arg should be the url\n"
    adb devices

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#!/bin/bash

# Parameters: nothing
# Required `$ANDROID_NDK` in your path. For example /Users/jonathan/Library/Android/sdk/ndk-bundle
# Script to generate pre-build opus files

BASE_DIR="$( cd "$( dirname "${BASH_SOURCE[0]}" )" >/dev/null && pwd )"

if [ -z "$ANDROID_NDK" ]; then
    echo "Please set ANDROID_NDK to the Android NDK folder"

Mercandj

Android: Application initialization

On Android, there is a common issue that developers must solve: Deal with heavy load at application start.

1. Application.onCreate()

The easier solution is to put the initialization on the Application

class MainApplication: Application() {

Mercandj

Immutable lists

Introduction

Immutable lists can be misleading. Here I will use Kotlin. This snippet is viable on Java, C#, Swift... too.

I'm assuming you understand why immutable objects are "more robust" to manipulate data.

Here a "book" with "pages".

Mercandj

Android: Activity restoration

When you user click Home on any of your activity, the system will save the state of the activity stack and the state of your top-activity.

Then, when your user go back to your application, this activity and the activities stack will be restored on a new JVM.

How to test it?

• Open your app
• Go to the activity you want to test

Mercandj

Android: Upload AppBundle on PlayStore

Goal:

Upload AppBundle on the PlayStore via the termial. Based on the Google API Publisher v3.

Process:

• Be sure to have Java installed
• Be sure to have your AppBundle file .aab

Mercandj

Android: LiveData

Pros, Cons, Conclusion. TLDR; More Cons than Pros.

class Timer {

   private val timeLeftMillis = MutableLiveData(5_000L)
   
 fun getTimeLeftMillis(): LiveData {