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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

Android Recyclerview GridLayoutManager column spacing Here is the question, the first answer does not work well in my project,and it makes the spacing bigger between item and item. the second answer is quite perfect.But if RecyclerView has headers,it does not work well. Then I fixed it.

import android.graphics.Rect;
import android.support.v7.widget.RecyclerView;
import android.view.View;

/**

	/**
	* 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.

	@file:Suppress("unused", "FunctionName", "IllegalIdentifier")

	import android.annotation.SuppressLint
	import android.app.Activity
	import android.content.Context
	import android.content.Intent
	import android.os.Bundle

	/**
	* The best way to launch yourself an activity. Your implementation should enable the following api:

	apply plugin: 'com.android.application'

	// version information
	def versionMajor = 1
	def versionMinor = 0
	def versionPatch = 0

	android {
	compileSdkVersion 26
	buildToolsVersion "26.0.2"

	public static void printActivityFlags(String activityName, Intent intent) {
	Field[] declaredFields = Intent.class.getDeclaredFields();
	StringBuilder stringBuilder = new StringBuilder(activityName + " => ");
	for (Field field : declaredFields) {
	if (field.getName().startsWith("FLAG_")) { // Fetch all the flag names which start from "FLAG_"
	try {
	int flag = field.getInt(null);
	if ((intent.getFlags() \| flag) == intent.getFlags()) { // checking that flag is present or not.
	stringBuilder.append(field.getName());
	stringBuilder.append("\|");

	signingConfigs {
	vanillaPaid {
	...
	}
	vanillaFree {
	...
	}
	chocolatePaid {
	...
	}

	public static class Blur {

	private static final float BLUR_RADIUS = 20.5f; // 25 is maximum radius

	// returns blur drawable if api >= 17. returns original drawable if not.
	@Nullable
	public static Drawable applyBlur(Drawable drawable, Context context) {
	if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.JELLY_BEAN_MR1) {
	Bitmap fromDrawable = drawableToBitmap(drawable);
	int width = Math.round(fromDrawable.getWidth() * 0.8f);

	apply plugin: 'com.android.application'

	ext.versionMajor = 1
	ext.versionMinor = 2
	ext.versionPatch = 3
	ext.versionClassifier = null
	ext.isSnapshot = true
	ext.minimumSdkVersion = 19

	android {

	// TODO add <meta-data android:value="GlideModule" android:name="....OkHttpProgressGlideModule" />
	// TODO add <meta-data android:value="GlideModule" tools:node="remove" android:name="com.bumptech.glide.integration.okhttp.OkHttpGlideModule" />
	// or not use 'okhttp@aar' in Gradle depdendencies
	public class OkHttpProgressGlideModule implements GlideModule {
	@Override public void applyOptions(Context context, GlideBuilder builder) { }
	@Override public void registerComponents(Context context, Glide glide) {
	OkHttpClient client = new OkHttpClient();
	client.networkInterceptors().add(createInterceptor(new DispatchingProgressListener()));
	glide.register(GlideUrl.class, InputStream.class, new OkHttpUrlLoader.Factory(client));
	}