mohamed-khaled-hsn

/**
 * @return [LiveData] with value produced from combining [source1] and [source2] using [combiner]
 *
 * This function produces new value only if [source1] and [source2] values are not null
 */
fun <T1, T2, R> combineNonNull(
    source1: LiveData<T1>,
    source2: LiveData<T2>,
    combiner: (T1, T2) -> R

GabrielBrasileiro

/**
 * This will recover and inject your interface in your fragments or activities
 */
inline fun <reified I, reified O> ComponentCallbacks.injectMapper(): Lazy<Mapper<I, O>> {
    return inject(named(identifier<I, O>()))
}

titoaesj

OBS: O var_number_int é a varável que recebera o valor a ser convertido em DP

(int) TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, var_number_int, getResources().getDisplayMetrics())


##KOTLIN
val Int.dp: Int 
    get() = (this * Resources.getSystem().displayMetrics.density + 0.5f).toInt()

val Float.dp: Int 

cretz

⚠️ THIS LIST IS STALE/OUTDATED, DO NOT REFERENCE OR ASSUME ANYTHING IS ACCURATE

Kotlin Annoyances

These are things that I found annoying writing a complex library in Kotlin. While I am also a Scala developer, these should not necessarily be juxtaposed w/ Scala (even if I reference Scala) as some of my annoyances are with features that Scala doesn't even have. This is also not trying to be opinionated on whether Kotlin is good/bad (for the record, I think it's good). I have numbered them for easy reference. I can give examples for anything I am talking about below upon request. I'm sure there are good reasons for all of them.

starkej2

/**
 * Replaces the default RxJava schedulers with a synchronous one.
 */
class RxImmediateSchedulerRule : TestRule {
    private val immediateScheduler = object : Scheduler() {
        @NonNull
        override fun scheduleDirect(run: Runnable, delay: Long, unit: TimeUnit): Disposable {
            // Hack to prevent stack overflows in unit tests when scheduling with a delay;
            return super.scheduleDirect(run, 0, unit)
        }

robertpainsi

How to reopen a pull-request after a force-push?

Precodinitions

• You need the rights to reopen pull requests on the repository.
• The pull request hasn't been merged, just closed.

Instructions

1. Write down the current commit hash of your PR-branch git log --oneline -1 <PR-BRANCH>
2. Write down the latest commit hash on github before the PR has been closed.
3. git push -f origin :

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:
-----------

sheharyarn

SwingUp Animations for Android

I use these snippets to implement Google Now Card appear-animations on Android. Add these two files to your res/anim/ folder and add a swing_anim_time integer to your values:

<!-- res/values/strings.xml -->
<integer name="swing_anim_time">750</integer>

mombrea

public static void postNewComment(Context context,final UserAccount userAccount,final String comment,final int blogId,final int postId){
    mPostCommentResponse.requestStarted();
    RequestQueue queue = Volley.newRequestQueue(context);
    StringRequest sr = new StringRequest(Request.Method.POST,"http://api.someservice.com/post/comment", new Response.Listener<String>() {
        @Override
        public void onResponse(String response) {
            mPostCommentResponse.requestCompleted();
        }
    }, new Response.ErrorListener() {
        @Override

scottyab

import android.content.Context;
import android.content.pm.PackageInfo;
import android.content.pm.PackageManager;
import android.content.pm.PackageManager.NameNotFoundException;
import android.content.pm.Signature;

public class TamperCheck {

//we store the hash of the signture for a little more protection
private static final String APP_SIGNATURE = "1038C0E34658923C4192E61B16846";