alana-mullen

import android.content.Context
import android.net.ConnectivityManager
import android.net.NetworkCapabilities
import android.os.Build

val Context.isConnected: Boolean
    get() {
        val connectivityManager = this.getSystemService(Context.CONNECTIVITY_SERVICE) as ConnectivityManager
        return when {
            Build.VERSION.SDK_INT >= Build.VERSION_CODES.M -> {

antonyharfield

// Result is a superpowered enum that can be Success or Failure
// and the basis for a railway junction
sealed class Result<T>
data class Success<T>(val value: T): Result<T>()
data class Failure<T>(val errorMessage: String): Result<T>()

// Composition: apply a function f to Success results
infix fun <T,U> Result<T>.then(f: (T) -> Result<U>) = 
    when (this) {
        is Success -> f(this.value)

humblehacker

Don't expose MutableLiveData

Example from Android Jetpack: LiveData

MutableLiveData Example

Fun with LiveData (Android Dev Summit '18)

anolivetree

package com.example.util

import android.support.v7.widget.LinearLayoutManager
import android.support.v7.widget.RecyclerView

/**
 * Call listener when the current page is changed.
 * Use this with LinearLayoutManager and PagerSnapHelper.
 *
 * Whether the listener is called at first might depend on the version of RecyclerView.

webserveis

Material text sizes XML for Android

Simple helper file for standard text sizes in material design. The sizes are provided by the material design documentation https://www.google.com/design/spec/style/typography.html#typography-roboto

Standard Styles

Too many type sizes and styles at once can wreck any layout. A typographic scale is a limited set of type sizes that work well together, along with the layout grid. The basic set of styles are based on a typographic scale of 12, 14, 16, 20, and 34.

lopspower

Hexadecimal color code for transparency

How to set transparency with hex value ?

For example, you want to set 40% alpha transparence to #000000 (black color), you need to add 66 like this #66000000.

Download This sample on Google Play Store

nolanlawson

How to link an Android app to a local dependency

Disclaimer: This is dumb. If anybody knows a better way, I'm all ears.

You have two Android projects. One is a library and one is an app that depends on that library. Both are on your local machine.

Now, say you want to test the library in the app before you publish it. Here's what you do.

You have an app and a lib: