JoseAlcerreca

/**
 * An [Observer] for [Event]s, simplifying the pattern of checking if the [Event]'s content has
 * already been handled.
 *
 * [onEventUnhandledContent] is *only* called if the [Event]'s contents has not been handled.
 */
class EventObserver<T>(private val onEventUnhandledContent: (T) -> Unit) : Observer<Event<T>> {
    override fun onChanged(event: Event<T>?) {
        event?.getContentIfNotHandled()?.let { value ->
            onEventUnhandledContent(value)

JoseAlcerreca

/**
 * Used as a wrapper for data that is exposed via a LiveData that represents an event.
 */
open class Event<out T>(private val content: T) {

    var hasBeenHandled = false
        private set // Allow external read but not write

    /**
     * Returns the content and prevents its use again.

ronshapiro

1. You can implement View.getActivity() like this:

public interface ViewWithActivity {
  // Using android-gradle-plugin 3.0, which has the desugar step for default methods on interfaces
  default Activity getActivity() {
    // https://android.googlesource.com/platform/frameworks/support/+/03e0f3daf3c97ee95cd78b2f07bc9c1be05d43db/v7/mediarouter/src/android/support/v7/app/MediaRouteButton.java#276
    Context context = getContext();
    while (context instanceof ContextWrapper) {
      if (context instanceof Activity) {

jmarkovic

/**
 * Typedef annotation listing all permissions
 * available in the latest SDK.
 * Using this on a method parameter
 * or on a method with {@link String} return value
 * will trigger value lookup in Android Studio.
 * 
 * @version SDK23
 * @author jmarkovic
 */

cmelchior

// GSON can parse the data.
//
// Deserialization:
// Note there is a bug in GSON 2.3.1 that can cause it to StackOverflow when working with RealmObjects.
// To work around this, use the ExclusionStrategy below or downgrade to 1.7.1
// See more here: https://code.google.com/p/google-gson/issues/detail?id=440
//
// Serialization:
// <Type>RealmProxy objects are created by the Realm annotation processor. They are used to control
// access to the actual data instead of storing them in fields and it is therefore them we need to register a

boxme

Unless specified otherwise, all of the below tinting applies to both Lollipop and pre-Lollipop using AppCompat v21. 
To use the support version of these attributes, remove the android namespace.  

For instance, "android:colorControlNormal" becomes "colorControlNormal".  

These attributes will be propagated to their corresponding attributes within the android namespace 
for devices running Lollipop.  Any exceptions to this will be noted by including the "android:" prefix.
 
All Clickable Views:
-----------

thuytrinh

import android.view.View;
import android.widget.AbsListView;

public abstract class OnVerticalScrollDirectionListener implements AbsListView.OnScrollListener {

    /**
     * TODO: Make it changeable
     */
    public static final int DEFAULT_SCROLL_OFFSET_THRESHOLD = 6; /* In pixels */

daniellevass

<?xml version="1.0" encoding="utf-8"?>
<resources>

<!-- google's material design colours from 
http://www.google.com/design/spec/style/color.html#color-ui-color-palette -->

    <!--reds-->
    <color name="md_red_50">#FFEBEE</color>
    <color name="md_red_100">#FFCDD2</color>
    <color name="md_red_200">#EF9A9A</color>

staltz

The introduction to Reactive Programming you've been missing

(by @andrestaltz)

---

This tutorial as a series of videos

If you prefer to watch video tutorials with live-coding, then check out this series I recorded with the same contents as in this article: Egghead.io - Introduction to Reactive Programming.

---

rxaviers

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