dodyg

#Intro

Kotlin is a new programming language for the JVM. It produces Java bytecode, supports Android and generates JavaScript. The latest version of the language is Kotlin M5.3

Kotlin project website is at kotlin.jetbrains.org.

All the codes here can be copied and run on Kotlin online editor.

Let's get started.

jpelgrim

public class MySingleton {

    static final Object mLock = new Object();

    static MySingleton mInstance;

    private Context mContext;

    // Private constructor prevents instantiation from other classes
    private MySingleton() { }

macodev

# PATHS
export MAMP_PATH=/Applications/MAMP/bin/php/php5.6.2/bin
export GIT_PATH=/usr/local/git/bin
export PATH="/usr/bin:/bin:/usr/sbin:/sbin:/usr/local/bin:/usr/X11/bin"
export RVM_PATH=$HOME/.rvm/bin
export PATH="$MAMP_PATH:$GIT_PATH:$RVM_PATH:$PATH"
# export MANPATH="/usr/local/man:$MANPATH"

# Path to your oh-my-zsh installation.
export ZSH=$HOME/.oh-my-zsh

davfre

git cheat-sheet

The git command-line utility has plenty of inconsistencies http://steveko.wordpress.com/2012/02/24/10-things-i-hate-about-git/

A GUI like http://sourcetreeapp.com is often helpful, but staying on the command line usually quicker. This is a list of the commands I use most frequently, listed by functional category:

Current state

git status list which (unstaged) files have changed

mareksuscak

#!/bin/bash

# Thanks goes to @pete-otaqui for the initial gist:
# https://gist.github.com/pete-otaqui/4188238
#
# Original version modified by Marek Suscak
#
# works with a file called VERSION in the current directory,
# the contents of which should be a semantic version number
# such as "1.2.3" or even "1.2.3-beta+001.ab"

VDenis

1. Store api keys in a xml file

Put xml file "api_keys.xml" in the directory "res/value/".

api_keys.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>
    <string name="THE_MOVIE_DB_API_TOKEN">XXXXX</string>
</resources>

jayrambhia

public interface AvailabilityChecker {
    Observable<ValidationResult<String>> isEmailAvailable(@NonNull String email);
    Observable<ValidationResult<String>> isUsernameAvailable(@NonNull String email);

    ValidationResult<String> isEmailAvailableSync(@NonNull String email);
    ValidationResult<String> isUsernameAvailableSync(@NonNull String email);
}

wojteklu

Code is clean if it can be understood easily – by everyone on the team. Clean code can be read and enhanced by a developer other than its original author. With understandability comes readability, changeability, extensibility and maintainability.

---

General rules

1. Follow standard conventions.
2. Keep it simple stupid. Simpler is always better. Reduce complexity as much as possible.
3. Boy scout rule. Leave the campground cleaner than you found it.
4. Always find root cause. Always look for the root cause of a problem.

Design rules

jemshit

# If your project uses WebView with JS, uncomment the following
# and specify the fully qualified class name to the JavaScript interface
# class:
-keepclassmembers class fqcn.of.javascript.interface.for.webview {
   public *;
}

### RxJava, RxAndroid (https://gist.github.com/kosiara/487868792fbd3214f9c9)
-keep class rx.schedulers.Schedulers {
    public static <methods>;

sturdustgeorgiana

package com.sistahwork.costin; /**
 * Add your package below. Package name can be found in the project's AndroidManifest.xml file.
 * This is the package name our example uses:
 *
 * package com.example.android.justjava;
 */

import android.content.Intent;
import android.net.Uri;
import android.os.Bundle;