Book Image

Android Studio 4.0 Development Essentials - Kotlin Edition

By : Neil Smyth
Book Image

Android Studio 4.0 Development Essentials - Kotlin Edition

By: Neil Smyth

Overview of this book

Kotlin as an Android-compatible programming language is becoming increasingly popular. Fully updated for Android Studio 4.0, this book will teach you the skills necessary to develop Android-based applications using Kotlin. Starting with the basics, this book outlines the steps necessary to set up Android development and testing environments, and goes on to introduce you to programming in Kotlin. You’ll practice Java to Kotlin code conversion and explore data types, operators, expressions, loops, functions, as well as the basics of OOP in Kotlin. You’ll then learn about Android architecture components and advanced topics, such as intents, touchscreen handling, gesture recognition, multi-window support integration, and biometric authentication. As you make progress, you’ll explore Android Studio 4.0’s key features, including layout editor, direct reply notifications, and dynamic delivery. You’ll also delve into Android Jetpack and create a sample app project using ViewModel, the Android Jetpack component. Finally, you will upload your app to Google Play Console and model the build process using Gradle. By the end of this Android book, you’ll be fully prepared to develop applications using Android Studio 4.0 and Kotlin.
Table of Contents (97 chapters)
97
Index

88.7 Drawing the Content on the Page Canvas

We have now reached the point where some code needs to be written to draw the content on the pages so that they are ready for printing. The content that gets drawn is completely application specific and limited only by what can be achieved using the Android Canvas class. For the purposes of this example, however, some simple text and graphics will be drawn on the canvas.

The onWrite() method has been designed to call a method named drawPage() which takes as arguments the PdfDocument.Page object representing the current page and an integer representing the page number. Within the MainActivity.kt file this method should now be implemented as follows:

package com.ebookfrenzy.customprint

.

.

import android.graphics.Color

import android.graphics.Paint

 

class MainActivity : AppCompatActivity() {

.

.

   inner class MyPrintDocumentAdapter(private var context: Context) :

   ...