Skip to Main Content
Android NDK Beginner`s Guide - Second Edition
book

Android NDK Beginner`s Guide - Second Edition

by Sylvain Ratabouil
April 2015
Beginner to intermediate content levelBeginner to intermediate
494 pages
10h 26m
English
Packt Publishing
Content preview from Android NDK Beginner`s Guide - Second Edition

Time for action – allocating an object with JNI

Let's define a background Watcher that will use an object shared between Java and C/C++ as a lock:

  1. In Store.java, add two new methods to start and stop a watcher thread. These methods respectively return and take a long as parameter. This value helps us hold a native pointer on the Java side:
    public class Store implements StoreListener {
        ...
        public native long startWatcher();
        public native void stopWatcher(long pPointer);
    }
  2. Create a new file, StoreThreadSafe.java. The StoreThreadSafe class inherits from the Store class and aims at making the Store instances thread-safe using synchronized Java blocks. Declare a static member field LOCK of type Object and define a default constructor:
    package com.packtpub.store; ...
Become an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
and much more.
Start your free trial

You might also like

Pro Android C++ with the NDK

Pro Android C++ with the NDK

Onur Cinar
Learning Embedded Android N Programming

Learning Embedded Android N Programming

Ivan Morgillo, Stefano Viola

Publisher Resources

ISBN: 9781783989645Supplemental Content