Android NDK Environment Setup

If you want to open a high-efficiency software on Android, or need to use the C + + language, in order to develop the C + + language on Java need to install the NDK on the IDE, the Android Web SDK development environment has included the ADT plugin, The latest Android development IDE can be downloaded from the website: http://developer.android.com/sdk/index.html

Since the recent Android website and Google in the domestic often do not go, I put the download to the network disk, there is a need to download: http://pan.baidu.com/s/1hq3iBGw

Prepared files

Installing the NDK environment on a new version of ADT is very convenient, my ADT version is V22.0.5 and the version number is displayed when the ADT is opened for loading

On the official website: http://developer.android.com/tools/sdk/ndk/index.html Download the latest NDK,NDK version integrates Cygwin after R7 and does not need to be installed separately Cygwin

1. Eclipse Configuration

SDK Configuration

NDK configuration, the path is the extracted NDK root directory

Let's test if the NDK is installed successfully.

Create an Android project with add Native support

The new project is now a JNI directory.

An error may be reported by the IDE:

[2014-06-23 17:08:36-unable to launch Cygpath. is Cygwin on the path?] Java.io.IOException:Cannot Run Program "Cygpath": CreateProcess error=2,?? Õ?» µ½?¶

Right-click the project and select the following options

Setting environment variables Ndkroot,value is the NDK directory you extracted.

Configured here: ${ndkroot}/ndk-build.com is the following script file

Then go to the clean project and you won't get an error.

The following is to write the JNI C + + file, but there is no code hint, because there is no reason to import the header file

Import header File method, select "Project Properties"

Click "Add"

At this point, press "ALT +/" to have a code hint

The next step is to write code

In the NDKTest.cpp file

#include <string.h> #include <jni.h>jstring java_com_dzt_ndktest_mainactivity_stringjni (jnienv* env,        jobject thiz) {return Env->newstringutf ("Hello jni my first Jni");}

The Android.mk file is automatically generated and can be used without modification

Local_path: = $ (call My-dir) include $ (clear_vars) local_module    : = ndktestlocal_src_files: = Ndktest.cppinclude $ ( Build_shared_library)

Activity class calling Code

Package Com.dzt.ndktest;import Android.app.activity;import Android.os.bundle;import android.widget.textview;public Class Mainactivity extends Activity {@Overrideprotected void onCreate (Bundle savedinstancestate) {super.oncreate ( Savedinstancestate); Setcontentview (R.layout.activity_main); TextView TV = (TextView) Findviewbyid (r.id.tv); Tv.settext (Stringjni ());} Public native String Stringjni (); static {system.loadlibrary ("Ndktest");}}

Build Project

Successfully passed

Run the program again, unfortunately, the error

If the C + + file needs to be added extern "C", export from C language

Modify the code as follows

#include <string.h> #include <jni.h>extern "C" {jstring java_com_dzt_ndktest_mainactivity_stringfromjni ( jnienv* env,jobject thiz) {return Env->newstringutf ("Hello JNI");}}

Successfully passed

Source code Download: http://download.csdn.net/detail/deng0zhaotai/7540771
More examples can be obtained from the following directory, which is an example of the NDK's own.