rharter

package com.pixite.pigment.testing

import android.app.Activity
import android.app.Instrumentation
import android.content.Context
import android.content.Intent
import androidx.fragment.app.Fragment
import androidx.fragment.app.FragmentActivity
import androidx.fragment.app.FragmentManager
import androidx.lifecycle.Lifecycle

zacwest

let styles: [UIFont.TextStyle] = [
    // iOS 17
    .extraLargeTitle, .extraLargeTitle2,
    // iOS 11
    .largeTitle,
    // iOS 9
    .title1, .title2, .title3, .callout,
    // iOS 7
    .headline, .subheadline, .body, .footnote, .caption1, .caption2,
]

ZacSweers

View Click

Instead of the verbose setOnClickListener:

RxView.clicks(submitButton).subscribe(o -> log("submit button clicked!"));

Filter even numbers

Observable
    .just(1, 2, 3, 4, 5, 6, 7, 8, 9, 10)

ErikHellman

Boosting the performance for Gradle in your Android projects

Ever feel like all you do is waiting for the builds to complete in Android Studio all day? Me too. Fortunately, there are a number of improvements you can do to speed things up. Some of these are still experimental and could be unsafe, but it is probably worth a try in case you’re suffering from long build times. I’ve seen project go down to 2.5 seconds when building after small code changes using the stuff I describe below. Hope it works for you as well.

Android uses Gradle for building. The default version of Gradle at the time of writing is 2.2. The latest version is 2.4 and has a huge performance boost over previous versions. In order to make your Android project use this version, add the following at the end of your root build.grade script.

task wrapper(type: Wrapper) {
    gradleVersion = '2.4'
}

dustin-graham

public static Observable<List<String>> paginatedThings(final Observable<Void> onNextObservable) {
        return Observable.create(new Observable.OnSubscribe<List<String>>() {
            @Override
            public void call(final Subscriber<? super List<String>> subscriber) {

                onNextObservable.subscribe(new Observer<Void>() {
                    int latestPage = -1;
                    @Override
                    public void onCompleted() {
                        subscriber.onCompleted();

JakeWharton

/**
 * Show the activity over the lockscreen and wake up the device. If you launched the app manually
 * both of these conditions are already true. If you deployed from the IDE, however, this will
 * save you from hundreds of power button presses and pattern swiping per day!
 */
public static void riseAndShine(Activity activity) {
  activity.getWindow().addFlags(FLAG_SHOW_WHEN_LOCKED);

  PowerManager power = (PowerManager) activity.getSystemService(POWER_SERVICE);
  PowerManager.WakeLock lock =

gabrielemariotti

You can use this class to realize a simple sectioned grid RecyclerView.Adapter without changing your code.

The RecyclerView has to use a GridLayoutManager.

This is a porting of the class SimpleSectionedListAdapter provided by Google

If you are looking for a sectioned list RecyclerView.Adapter you can take a look here

ssinss

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

public abstract class EndlessRecyclerOnScrollListener extends RecyclerView.OnScrollListener {
    public static String TAG = EndlessRecyclerOnScrollListener.class.getSimpleName();

    private int previousTotal = 0; // The total number of items in the dataset after the last load
    private boolean loading = true; // True if we are still waiting for the last set of data to load.
    private int visibleThreshold = 5; // The minimum amount of items to have below your current scroll position before loading more.
    int firstVisibleItem, visibleItemCount, totalItemCount;

AnderWeb

AppCompat-v7:21 provides a very useful way of dealing with pressed/focused/activated states maintaining backwards compatibility downto API-7, but there's a small issue (big for some) with the default selectableItemBackground: It uses some PNGs and/or default values for API<21.

The main reason is that android drawable resource definitions (prior API 21) CANNOT use theme attributes at all, so there's no way of making something like:
<shape android:shape="rectangle">
        <solid android:color="?attr/colorControlHighlight" />
</shape>

For this, I've put this simple mockup on how to give your app better drawables that the appcompat defaults.

onyxmueller

import groovy.transform.Field

// This is a drop-in Gradle script that allows you to easily strip out the packages you don't need
// from the Google Play Services library. The script will keep track of previous runs to prevent
// restripping each time you build.

// HOW TO USE THIS
//
// 1) Download/copy this strip_google_play_services.gradle file into the same location of your app's
//    build.gradle file.