android studio ndk tutorial

(JNIEnv * env, jclass ){ return env->NewStringUTF("这里是来自c的string"); }Using the JNI functionAfter completing the various configurations and the writing of C + + files, if you need to implement the JNI call native function within the application, you need to first load the so library native code compiled://jnitest for the name of the library, which is configured in the app build .gradle defaultconfig Modulenamesystem ( "jnitest" ) package com.example.jokerlee.myapplication;import android.

I mentioned in the http://www.cnblogs.com/fx-blog/p/8206737.html article How to import OpenCV (including the Opencv_contrib part) in the Java layer in Android studio, But this is only the Java layer of import, with the deepening of learning, we can gradually find that OPENCV library support for Java is not very strong, such as when I use the SIFT algorithm, generally extracted features more than 10,000 poin

.3. What is JNI?The full name of JNI is Java Native Interface, which provides a number of APIs that enable the communication of Java and other languages (mainly C and C + +).4. Why use JNI?The purpose of JNI is to enable Java methods to invoke some of the functions implemented by C.5. What is the so file in Android?The so file used in Android is a C + + library of functions. In the Jni of

is JNI? The full name of JNI is Java Native Interface, which provides a number of APIs that enable the communication of Java and other languages (mainly C and C + +).Why use JNI? The purpose of JNI is to enable Java methods to invoke some of the functions implemented by C.What is the so file in Android? The so file used in Android is a C + + library of functions. In the Jni of

When it comes to NDK development, there are some times when you need to call some of the bottom- C + + programs for your project needs, and in order to be more efficient. But there are times when you don't have to, and that's why? Personal feeling sometimes feel trouble, first to configure the NDK to download Cygwin, configuration Cygwin, and then need to build, ah too troublesome. If you say the use of Ecl

compiling with the Ndk-build command, Ndk-build needs to search the JNI directory, and if there is no JNI directory, Ndk-build will assume there are no projects to compile.Also using Gradle or GRADLE-EX, they are also fixed search directory paths.Generally in the SRC directory:App/build/intermediatesApp/libsjar Package Import DirectoryApp/src/main/javaC header f

Android Studio uses the new Gradle build tool to configure the NDK environment and gradlendk Android Studio 1.3 Beta1 supports NDK. However, it uses a brand new and experimental gradle build tool. Official Address: http://tools.a

Because of the relationship between work content, the work of the NDK involves a relatively wide range (confidentiality, security), so this chapter describes the basic use of the NDK.There are many such tutorials or descriptions on the Web, but the description is not entirelyDevelopment tools: Android Studio 2.1.2NDK version:

Android Studio NDK Development I used to develop NDK In the Eclipse environment. Today, I tried to use Android Studio for configuration. The result is actually a pitfall everywhere. Now let's summarize: 1. Steps 1. First create Ma

Android Studio Ndk Programming Now the Android program has basically been developed from Eclipse to Android Studio. Recently, the project needs to use ndk programming, so I have a hard

1. First write a native local method in the class, for example (static not necessary, only for invocation):1 Public class jnitest {2 Public Static native string getString (string s); 3 }2. Then rebuild Probject, under the project app/build/intermediates/classes/debug/package name, generates the above class name. class,Open Command window, CD to Project \app\build\intermediates\classes\debug, enter command: JAVAH-JNI package name. Jnitest,will generate the package name _jnitest.h header fil

App_allow_missing_deps=true to allow MISSING dependencies). Stop.D:\zengjf\SourceCode\Android\android_app\Test>2. Workaround1. C:\Users\zengjf\AppData\Local\Android\Sdk\ndk-bundle\build\core\build-binary.mk2. Modify content: ... ifdef undefined_libs $ (call __ndk_warning,module $ (local_ MODULE) depends on undefined modules: $ (undefined_libs)) # https://github

Now that the Android program has been basically moved from Eclipse to Android studio, the recent project needs to use the NDK programming, so it was a bit of a toss.Development environment Android Studio 1.5.1

Android Studio NDK compilingThe first step:in the Main set up below JNI folder: The relevant files are put in.Step Two:App/build.gradle belowAdd code:NDK {modulename "App"//cFlags "-DANDROID_NDK"//Define some macrosldlibs "EGL", "GLESv3", "DL", "Log" //Link with these libraries!STL "Stlport_shared"}Specific as follows:Step Three:in the local.properties in the fil

Use Android Studio to run the ndk Program Recently, I want to study the android dual-process daemon. Because I used to write jni using eclipse, I am mainly using the as tool. Try to write a demo here and study the dual-process daemon.1. required tools Android

Use of NDK in Android Studio When developing android programs, we sometimes need applications to call underlying hardware. Android officially provides us with NDK so that we can call the C, C ++ library in our program.

Android Studio 2.1 ndk Breakpoint Debugging method (based on Android 2.1, Gradle 2.1.0)1. Create an android Studio Project2. Set the NDK path.menu, choose: File->project StructureIn the

Com.example.eclipsendk.MainActivit 2. In the Project Catalog column Jni folder right----C/c++source FileFill in the file name, select the. C file (do not generate a header file), and if you use a. cpp file, remember the extern "C"3. Write the native layer code, in MyJni.cpp#include"Test_com_androidstudiondk_mainactivity.h"//Copy the function declaration from the file.jniexport jstring jnicall java_test_com_androidstudiondk_mainactivity_getstring (JNIEnv*env, Jobject obj) { //. c files a

Recently prepared to study the Android dual-process daemon, since the previous use of eclipse to write JNI habits, and now mainly use as tools. Try to write a demo here and then study the two-process daemon.1. Required ToolsAndroid Studio 1.4ndk:android-ndk-r9d.... The rest must not be described here.2. Example introduction 1), Project creationOpen as to create a

Recently, we are ready to study the Android dual-process daemon, because it was used to write the JNI habit with eclipse. Today it is mainly used as tools. Try to write a demo here and then study the two-process daemon.1. Required ToolsAndroid Studio 1.4ndk:android-ndk-r9d.... The other must not be described here2, Demo sample introduction 1), Project creationOpe