whatever msgeorgem
danielgomezrico
/ DistanceCalculator.java
Last active
January 6, 2021 00:37
Java / Android - calculate the distance between two coordinates with great circle formula.
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| import static java.lang.Math.acos; | |
| import static java.lang.Math.cos; | |
| import static java.lang.Math.sin; | |
| /** | |
| * Calculate distance between coordinates. | |
| */ | |
| public class DistanceCalculator { | |
| static double PI_RAD = Math.PI / 180.0; |
janheinrichmerker
/ SpanningGridLayoutManager.java
Last active
September 16, 2025 22:06
GridLayoutManager implementation that stretches to fit all grid items on screen and disables scrolling. Useful for dashboards etc.
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| package com.example; | |
| import android.content.Context; | |
| import android.support.v7.widget.GridLayoutManager; | |
| import android.support.v7.widget.RecyclerView; | |
| import android.util.AttributeSet; | |
| import android.view.ViewGroup; | |
| public class SpanningGridLayoutManager extends GridLayoutManager { | |
mjohnsullivan
/ TimerActivity.java
Created
July 9, 2015 13:15
Example of how to create a long running timer service that survives activity destruction by moving to the foreground, and back to the background when a new activity bind to it.
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| // | |
| // Copyright 2015 Google Inc. All Rights Reserved. | |
| // | |
| // Licensed under the Apache License, Version 2.0 (the "License"); | |
| // you may not use this file except in compliance with the License. | |
| // You may obtain a copy of the License at | |
| // | |
| // http://www.apache.org/licenses/LICENSE-2.0 | |
| // | |
| // Unless required by applicable law or agreed to in writing, software |
mikelehen
/ generate-pushid.js
Created
February 11, 2015 17:34
JavaScript code for generating Firebase Push IDs
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| /** | |
| * Fancy ID generator that creates 20-character string identifiers with the following properties: | |
| * | |
| * 1. They're based on timestamp so that they sort *after* any existing ids. | |
| * 2. They contain 72-bits of random data after the timestamp so that IDs won't collide with other clients' IDs. | |
| * 3. They sort *lexicographically* (so the timestamp is converted to characters that will sort properly). | |
| * 4. They're monotonically increasing. Even if you generate more than one in the same timestamp, the | |
| * latter ones will sort after the former ones. We do this by using the previous random bits | |
| * but "incrementing" them by 1 (only in the case of a timestamp collision). | |
| */ |