Book Image

Android Studio 4.0 Development Essentials - Java Edition

By : Neil Smyth
Book Image

Android Studio 4.0 Development Essentials - Java Edition

By: Neil Smyth

Overview of this book

Android rolls out frequent updates to meet the demands of the dynamic mobile market and to enable its developer community to lead advancements in application development. This book focuses on the updated features of Android Studio (the fully integrated development environment launched by Google) to build reliable Android applications using Java. The book starts by outlining the steps necessary to set up an Android development and testing environment. You’ll then learn how to create user interfaces with the help of Android Studio Layout Editor, XML files, and by writing the code in Java. The book introduces you to Android architecture components and advanced topics such as intents, touchscreen handling, gesture recognition, multi-window support integration, and biometric authentication, and lets you explore key features of Android Studio 4.0, including the layout editor, direct reply notifications, and dynamic delivery. You’ll also cover Android Jetpack in detail and create a sample app project using the ViewModel component. Finally, you’ll upload your app to the Google Play Console and handle the build process with Gradle. By the end of this book, you’ll have gained the skills necessary to develop applications using Android Studio 4.0 and Java.
Table of Contents (88 chapters)
88
Index

79.7 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.java file this method should now be implemented as follows:

package com.ebookfrenzy.customprint;

.

.

import android.graphics.Canvas;

import android.graphics.Color;

import android.graphics.Paint;

 

public class MainActivity extends AppCompatActivity {

.

.

       public class MyPrintDocumentAdapter...