The performance improvements can come from three sources. Many multimedia applications and video games use native code for processor-intensive tasks. This is usually true for many processor-bound applications. Before we start our journey to NDK, it is important to understand the advantages of NDK.įirst of all, NDK may improve application performance. If you are looking for ways to make your application available in Android and take measures to boost your application's performance, then this Cookbook is for you.Īndroid NDK is a toolset that allows developers to implement a part of or an entire Android application in a native language, such as C, C++, and assembly. We will begin with a simple recipe, Hello NDK, before moving on to cover advanced topics with recipes on OpenGL ES that focus on 2D and 3D graphics, as well as recipes that discuss working with NDK and external APIs. The recipes cover various topics of application development with Android NDK such as OpenGL programming and Multimedia programming. By the end of this book you will be able to build your own apps in NDK apps."Android Native Development Kit Cookbook" begins with basic recipes that will help you in the building and debugging of native apps, and JNI programming. We will then explore the process of porting existing libraries and software to NDK. We will discover and learn JNI programming and essential NDK APIs such as OpenGL ES, and the native application API. Android NDK allows the developer to write in Native C/C++, giving you the power to reuse code and libraries and also, in most cases, increase the speed and efficiency of your application.The "Android Native Development Kit Cookbook" will help you understand the development, building, and debugging of your native Android applications. There are however times when this is not the most efficient or best method for the application being built. The composite image is Android applications would usually mean that you spend all of your time working in Java. The encrypted image cats_encypt.jpg cannot be viewed directly. File Encryption, Decryption, Segmentation and Merge - Brief BookĪs shown in the image, two assets'images cats.jpg and image.jpg will be copied into the local sdcard/NdkSample directory for testing. The following exercises are for reference: NDK Development Foundation II. In addition, the segmentation and merging of files are performance-intensive, and can be put into NDK processing to improve efficiency. The file encryption and decryption is designed to be secure, and NDK can be used to increase the difficulty of decompilation. When needed, the split files can be merged. Generally, when large files are transmitted, such as audio and video files, the files will be divided and then transmitted, thus improving efficiency. The following is a relatively simple ^ XOR operation to encrypt and decrypt files (a symmetric encryption algorithm)Īttachment: Encryption and decryption algorithm expansion: Encryption and Decryption Algorithms, Block Chain Technical Guidelines So we can encrypt and decrypt files by binary operation. Encryption and Decryption of Files and Separation and Merge 1.1 INTRODUCTIONĪll files are stored in binary, whether text, pictures or video files are stored in binary on disk. Detailed introduction or code can be viewed by clicking on the links inside. It only records some points or main steps that individuals need to pay attention to. Because demo is introduced on these projects online, there will be no detailed step-by-step instructions on how to operate. So continue the actual battle of JNI Android NDK Development: JNI Practical Chapter This article is mainly about the practice of some small NDK projects. If we only study theory, do not practice, do not step on the pit, it is generally difficult to find real problems in practical projects, but also more difficult to deepen the understanding of technology.
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