Alvin Dizon alvindizon

Falsehoods programmers believe about addresses

This is an anchor-linked version of the excellent, amazing original opus magnum by Michael Tandy.

An address will start with, or at least include, a building number.

Counterexample: Royal Opera House, Covent Garden, London, WC2E 9DD, United Kingdom.

When there is a building number, it will be all-numeric.

Counterexample: 1A Egmont Road, Middlesbrough, TS4 2HT

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

Combining two git repositories

Use case: You have repository A with remote location rA, and repository B (which may or may not have remote location rB). You want to do one of two things:

preserve all commits of both repositories, but replace everything from A with the contents of B, and use rA as your remote location
actually combine the two repositories, as if they are two branches that you want to merge, using rA as the remote location

NB: Check out git subtree/git submodule and this Stack Overflow question before going through the steps below. This gist is just a record of how I solved this problem on my own one day.

Before starting, make sure your local and remote repositories are up-to-date with all changes you need. The following steps use the general idea of changing the remote origin and renaming the local master branch of one of the repos in order to combine the two master branches.

	public class ObservableTest {

	@Test
	public void observable_withRecursion_returnsAllObjects() {
	final int maxPageNum = 15;
	getIntegers(1, 5, maxPageNum)
	.subscribe(System.out::println);
	}

	private Observable<Integer> getIntegers(final int pageStart, final int pageSize, final int maxPageNum) {

	package be.digitalia.common.widgets;

	import android.content.Context;
	import android.os.Build;
	import android.os.Parcel;
	import android.os.Parcelable;
	import android.support.annotation.NonNull;
	import android.support.v4.util.LongSparseArray;
	import android.support.v7.app.AppCompatActivity;
	import android.support.v7.view.ActionMode;

	// Not object class. AndroidManifest.xml error happen.
	class MainApplication : Application() {

	init {
	instance = this
	}

	companion object {
	private var instance: MainApplication? = null

	package co.ortatech.showandhide.ui.activity;

	import android.app.Activity;
	import android.app.Instrumentation;
	import android.content.Intent;
	import android.net.Uri;
	import android.support.test.InstrumentationRegistry;
	import android.support.test.espresso.intent.Intents;
	import android.support.test.espresso.intent.rule.IntentsTestRule;
	import android.support.test.runner.AndroidJUnit4;

	import com.google.common.collect.ImmutableList;
	import com.google.common.collect.Iterables;

	import java.security.KeyStore;
	import java.security.KeyStoreException;
	import java.security.NoSuchAlgorithmException;
	import java.security.cert.CertificateException;
	import java.security.cert.X509Certificate;
	import java.util.Arrays;
	import java.util.List;


	import com.squareup.okhttp.ResponseBody;
	import okio.BufferedSink;
	import okio.Okio;
	import retrofit.Response;
	import retrofit.http.GET;
	import retrofit.http.Query;
	import rx.Observable;

	interface ApiService {

	import java.io.BufferedInputStream;
	import java.io.BufferedReader;
	import java.io.File;
	import java.io.FileOutputStream;
	import java.io.IOException;
	import java.io.InputStream;
	import java.io.InputStreamReader;
	import java.io.OutputStream;
	import java.net.URL;
	import java.net.URLConnection;