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  • Book Overview & Buying Android 9 Development Cookbook
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Android 9 Development Cookbook

Android 9 Development Cookbook - Third Edition

By : Rick Boyer
3.4 (9)
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Android 9 Development Cookbook

Android 9 Development Cookbook

3.4 (9)
By: Rick Boyer

Overview of this book

The Android OS has the largest installation base of any operating system in the world. There has never been a better time to learn Android development to write your own applications, or to make your own contributions to the open source community! With this extensively updated cookbook, you'll find solutions for working with the user interfaces, multitouch gestures, location awareness, web services, and device features such as the phone, camera, and accelerometer. You also get useful steps on packaging your app for the Android Market. Each recipe provides a clear solution and sample code you can use in your project from the outset. Whether you are writing your first app or your hundredth, this is a book that you will come back to time and time again, with its many tips and tricks on the rich features of Android Pie.
Table of Contents (18 chapters)
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Read and write a text file to internal storage


When simple name/value pairs are not sufficient, Android also supports regular file operations, including working with text and binary data.

The following recipe demonstrates how to read and write a file to internal or private storage.

Getting ready

Create a new project in Android Studio and call it InternalStorageFileUse the default Phone & Tablet options and select Empty Activity in the Add an Activity to Mobile dialog.

How to do it...

To demonstrate both reading and writing text, we'll need a layout with an EditText and two buttons. Start by opening main_activity.xml and follow these steps:

  1. Replace the existing <TextView> element with the following views:
<EditText
android:id="@+id/editText"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:inputType="textMultiLine"
android:ems="10"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintBottom_toTopOf="@+id/buttonRead"
app:layout_constraintLeft_toLeftOf...
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Tech Concepts
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Programming languages
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Android 9 Development Cookbook
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