About NDK and installation and usage

In

1 ). Add it by yourself: Aygwin

 

2) perform JNI. Import

3) customize

4) JNI

5)

 

/**

* After the android project is released, it is decompiled and cracked to define the Web Service interface address and parameters,

* Therefore, it is necessary to encrypt the transmitted data. Considering the problem of decompilation in Java code, Android NDK is used for the final implementation,

* Uses the NDK to call the encryption algorithm written in C language to generate an MD5 verification code,

* Considering that SO written in C is stolen (SO files are directly referenced into the project), the C language is used to call Java code for caller Identity confirmation.

*/

Static

{

System. loadLibrary ("hello-jni ");

}

Load local

Decompress android-ndk-r5c-windows.zip

Decompress cygwin package.rar

Cygwin

Run

 

 

Set

 

 

Location of the installation program

 

Select only

 

Cygwin

Required

Home

D: \ ndk \ cygwin \ home \ username \. bash_profile (username) two rows below

NDK =/cygdrive/d/android-ndk-r5c-windows/android-ndk-r5c (d)

Export NDK

Home

After installation, add the following two lines to the. bash_profile file under \ cygwin \ etc \ skel \.

NDK =/cygdrive/d/android-ndk-r5c-windows/android-ndk-r5c

Export NDK
Then copy to some reboot

 

Test

Double-click cygwin

$ Cd $ NDK

Display

 

Write

View in D: \ android-ndk-r5c-windows \ android-ndk-r5c \ samples \ hello-jni \ hello-jni.c

Generate

Tttadasdfdsfdsafd @ zjj ~

$ Cd $ NDK

 

Tttadasdfdsfdsafd @ zjj/cygdrive/d/android-ndk-r5c-windows/android-ndk-r5c

$ Cd samples

 

Tttadasdfdsfdsafd @ zjj/cygdrive/d/android-ndk-r5c-windows/android-ndk-r5c/sample

S

$ Cd hello-jni

 

Tttadasdfdsfdsafd @ zjj/cygdrive/d/android-ndk-r5c-windows/android-ndk-r5c/sample

S/hello-jni

$ NDK/ndk-build

Gdbserver: [arm-linux-androideabi-4.4.3] libs/armeabi/gdbserver

Gdbsetup: libs/armeabi/gdb. setup

Compile thumb: hello-jni <= hello-jni.c

SharedLibrary: libhello-jni.so

Install: libhello-jni.so => libs/armeabi/libhello-jni.so

In

Set

 

 

In

 

Use

Protection Code

Code reuse.

C

You can manually allocate memory, such as videos.