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curioustechizen / LiveDataScanOperator.kt
Created Jan 23, 2019
Analog of RxJava's Observable.scan operator for Android Architecture Components LiveData
View LiveDataScanOperator.kt
* Analog of RxJava's Observable.scan operator.
* Returns a LiveData that applies the [accumulator] function to the fist item in the source LiveData,
* and an initial value, then feeds the result of that function along with the second item emitted by
* the source LiveData into the same function, and so on until all items have been emitted by the source
* LiveData, emitting the result of each of these iterations.
fun <T, R> LiveData<T>.scan(initialValue: R, accumulator: (R, T) -> R): LiveData<R> {
val returnLiveData = MediatorLiveData<R>()
curioustechizen /
Created Mar 19, 2018
Android: Cascade the value of a custom attribute from a parent view to a child view - solution to
// See
class CustomLayout extends WhateverLayout {
private float percent;
private CustomView customView;
//View constructors go here
private void init(){
//Inflation goes here if needed
class EspressoTextInputLayoutUtils{
* Use this method to find the EditText within the TextInputLayout. Useful for typing into the TextInputLayout
public static ViewInteraction onEditTextWithinTilWithId(@IdRes int textInputLayoutId) {
//Note, if you have specified an ID for the EditText that you place inside
//the TextInputLayout, use that instead - i.e, onView(withId(;
return onView(allOf(isDescendantOfA(withId(textInputLayoutId)), isAssignableFrom(EditText.class)));
curioustechizen /
Last active Sep 16, 2015
Android Visibility save/restore: Quick gist to demonstrate the fact that the visibility of views is not preserved across screen rotation or other save/restore cycles.
public class MainActivity extends Activity {
private TextView tvHello;
public void onCreate(Bundle savedInstanceState) {
tvHello = (TextView) findViewById(;
curioustechizen / js_revealing_module_snippet.js
Created Jul 10, 2015
Snippet for Visual Studio Code that created a revealing module pattern with constructor in Javascript
View js_revealing_module_snippet.js
"Revealing Module Pattern with constructor": {
"prefix": "reveal",
"body": [
"var ${1:ModuleName} = (function () {",
" var that,",
" constr = function (${2:constr_param}) {",
" that = this;",
" this.$2 = $2;",
" },",
View markdown.css
* {
font-size: 12pt;
font-family: monospace;
font-weight: normal;
font-style: normal;
text-decoration: none;
color: black;
cursor: default;
curioustechizen /
Created Apr 6, 2015
Android: Loading API Keys and other secrets from properties file using gradle
String apiKey = BuildConfig.API_KEY
View build.gradle
apply plugin: 'java'
sourceCompatibility = JavaVersion.VERSION_1_7
targetCompatibility = JavaVersion.VERSION_1_7
def logger = new
def sdkHandler = new, logger)
for (File file : sdkHandler.sdkLoader.repositories) {
project.repositories.maven {
url = file.toURI()
curioustechizen /
Last active May 29, 2019
Android programmatically checkable widgets, differentiate between user clicks & programmatic setChecked calls. Based on this answer on StackOverflow: There are times when setting a switch to ON results in some action (Save to DB/ perform an HTTP POST etc). However, you want this action to happen only o…
* An enhanced {@code CheckBox} that differentiates between user clicks and
* programmatic clicks. In particular, the {@code OnCheckedChangeListener} is
* <strong>not</strong> triggered when the state of the checkbox is changed
* programmatically.
public class EnhancedCheckBox extends CheckBox implements ProgrammaticallyCheckable{
private CompoundButton.OnCheckedChangeListener mListener = null;
public EnhancedCheckBox(Context context) {
curioustechizen /
Last active Jun 17, 2018
StateSavingArrayAdapter: An ArrayAdapter that knows how to save/restore its own state.
* <p>
* An {@code ArrayAdapter} that also knows how to save and restore its state.
* Basically all it does is save/restore the array of objects being managed by
* the Adapter.
* </p>
* <p>
* Note that this only saves the items and not things like checked item
* positions. Those belong to the {@link ListView} itself. Consider using
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