markus2610

This is a quick guide to Kotlin programming language. The previous part of this guide is here

#Object Oriented

fun main(args : Array<String>) {
  class local (val x : Int)
  
  val y = local(10)
 println("${y.x}")

markus2610

/*
 * Copyright 2015 Laurens Muller.
 *
 * 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

markus2610

package team2200.smartdashboard.extension.rectangletracker;

import edu.wpi.first.smartdashboard.camera.LaptopExtension;
import edu.wpi.first.smartdashboard.properties.BooleanProperty;
import edu.wpi.first.smartdashboard.properties.NumberProperty;
import edu.wpi.first.smartdashboard.types.DataType;
import edu.wpi.first.wpijavacv.WPIBinaryImage;
import edu.wpi.first.wpijavacv.WPIColor;
import edu.wpi.first.wpijavacv.WPIColorImage;
import edu.wpi.first.wpijavacv.WPIContour;

markus2610

Reactive Forms with RxAndroid and TextInputLayout

Reactive Programming has been getting a lot of attention in the Android community lately. While it has uses throughout the application stack, we're going to focus here on using it to validate forms (exciting!). This approach cuts down on ugly nested if statements and transforms all of the validation logic to just a few simple lines using the RxJava framework. More, its robust and testable.

This post assumes some knowledge of how RxJava and lambdas work. If you need more of a refresher RxJava Retrolambda

Setup layout with TextInputLayout

markus2610

#!/usr/bin/env bash 
#
# Converts Windows batch script to Linux shell script
#
# Invocation:
#     ./bat2sh script.bat
#

OUTFILE=${2:-${1%%.bat}.sh}

markus2610

My Android Java Code Review Checklist

1. Is the functionality correct?
2. Are the classes named suitably?
3. Are the functions named suitably?
4. How's the datastructure being used? Is it the correct DS or it needs improvement?
5. Can the classes be further borken into small classes?
6. Do we need an interface?
7. If it contain functions that can be reused later then are there Utils created for them?
8. Can it use already available Util functions?
9. Does the large set of input for a function deserve a new bean to be created?

markus2610

package com.company;

import retrofit.RestAdapter;
import retrofit.http.GET;
import retrofit.http.Path;
import rx.Observable;
import rx.Subscriber;
import rx.functions.Action1;
import rx.functions.Func1;
import rx.functions.Func2;

markus2610

Android Assets

Basic conceptions

Apply the main stream ratio 16:9, here are the screen sizes:

• mdpi: ~160dpi, 640 x 360 px
• hdpi: ~240dpi, 960 x 540 px
• xhdpi: ~320dpi, 1280 x 720 px
• xxhdpi: ~higher, 1920 x 1080 px

markus2610

Local Inspections

@SuppressWarnings("UndesirableClassUsage")
@SuppressWarnings("FileEqualsUsage")
@SuppressWarnings("GtkPreferredJComboBoxRenderer")
@SuppressWarnings("UnsafeVfsRecursion")
@SuppressWarnings("ConstantConditions")
@SuppressWarnings("UnusedAssignment")
@SuppressWarnings("NumericOverflow")
@SuppressWarnings("RedundantCast")

markus2610

import java.io.IOException;
import java.lang.reflect.Method;
import java.util.AbstractCollection;
import java.util.ArrayList;
import java.util.EnumSet;
import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;
import android.media.AudioManager;
import android.media.MediaPlayer;