Android Native Development Kit Cookbook by Feipeng Liu

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By Feipeng Liu

A step by step educational with greater than 60 concise recipes on Android NDK improvement skills.

Overview

• construct, debug, and profile Android NDK apps.
• enforce a part of Android apps in local C/C++ code.
• Optimize code functionality in meeting with Android NDK.

In Detail

Building Android purposes could frequently suggest that you simply spend your whole time operating in Java. There are even though instances while this isn't the best or top process for the appliance being outfitted. this is often the place Android NDK comes in.

Android NDK permits the developer to jot down in local C/C++, providing you with the facility to reuse code and libraries and likewise, regularly, bring up the rate and potency of your application.

The Android local improvement package Cookbook can assist you recognize the advance, construction, and debugging of your local Android functions. we'll detect and study JNI programming and crucial NDK APIs equivalent to OpenGL ES, and the local program API. we'll then discover the method of porting current libraries and software program to NDK. through the top of this e-book it is possible for you to to construct your individual apps in NDK apps.

Android local improvement package Cookbook starts with uncomplicated recipes to help you within the development and debugging of local apps, and JNI programming. The recipes hide numerous themes of software improvement with Android NDK reminiscent of OpenGL programming and Multimedia programming. we are going to commence with an easy recipe, hi NDK, earlier than relocating directly to disguise complicated issues with recipes on OpenGL ES that target second and 3D portraits, in addition to recipes that debate operating with NDK and exterior APIs. while you are searching for how you can make your software to be had in Android and take measures to spice up your application’s functionality, then this Cookbook is for you.

What you are going to examine from this book

• increase Android apps in C/C++ and not using a unmarried line of Java.
• software 2D/3D pics with either OpenGL ES 1x and 2.0 in Android NDK.
• Write multi-threaded Android apps in Android NDK.
• Port present C/C++ libraries and functions to Android with NDK.
• improve multimedia Android apps with Android NDK.

Approach

This publication is written in a Cookbook variety, starting with recipes which specialise in assisting builders make their software/application on hand in Android.

Who this ebook is written for

Android builders who are looking to research Android NDK programming, or boost multimedia and video games in Android NDK will make the most of this ebook.

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Additional info for Android Native Development Kit Cookbook

Sample text

This is not the only way. In our sample project, we explicitly called the RegisterNatives JNI function to register the native methods. The RegisterNatives function has the following prototype: jint RegisterNatives(JNIEnv *env, jclass clazz, const JNINativeMethod *methods, jint nMethods); The clazz argument is a reference to the class in which the native method is to be registered. The methods argument is an array of the JNINativeMethod data structure. JNINativeMethod is defined as follows: typedef struct { char *name; char *signature; void *fnPtr; } JNINativeMethod; name indicates the native method name, signature is the descriptor of the method's input argument data type and return value data type, and fnPtr is the function pointer pointing to the native method.

If it's a static method, the second parameter is a reference to the class where the method is defined. If it's an instance method, the second parameter is a reference to the object on which the native method is invoked. We will discuss JNI in detail in Chapter 2, Java Native Interface. ff Compilation of the native code: The Android NDK build system frees developers from writing makefile. mk file, which simply describes the sources. It will parse the file to generate makefile and do all the heavy lifting for us.

Additional parameters can be defined based on needs. The first parameter is a pointer to JNIEnv, which is the gateway to access various JNI functions. The meaning of the second parameter depends on whether the native method is a static or an instance method. If it's a static method, the second parameter is a reference to the class where the method is defined. If it's an instance method, the second parameter is a reference to the object on which the native method is invoked. We will discuss JNI in detail in Chapter 2, Java Native Interface.

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