How to compile Cmake file with Android.mk?

Question

I need to generate ARM structure shared library for a sampleCPP project.

Sample projects contains:

• CMakeLists.txt
• some.cpp (s)
• Some.h (s)
• some.tab.cpp.make (S)
• some.tab.hpp.cmake (s)

Now, I want to create a shared library for a different Android project. I tried to compile with [Android-Cmake][1]but it is generating X86 Architecture library not ARM.

Please let me know if there is another way to do it. Also can i run X86 on Android Platform for all version?

Edit :

Here is my Android.mk:

LOCAL_PATH := $(call my-dir)/../   //Path is according JNI Folder
SRC_TOP_DIR := $(LOCAL_PATH)

include $(CLEAR_VARS)

LOCAL_MODULE := smileParse
LOCAL_CFLAGS := -DANDROID

LOCAL_SRC_FILES := main.cpp test.cpp smamain.cpp
LOCAL_C_INCLUDES := $(LOCAL_PATH)/../include $(LOCAL_PATH)/

Answer 1

Create a folder called JNI in your project:

Create or Edit Android.mk in JNI folder, set include and library path,

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE    := hello-jni
LOCAL_SRC_FILES := some.cpp
include $(BUILD_SHARED_LIBRARY)

Declare a java wrapper class, declare a native function:

public class JWrapperSomeClass {
    public native void Demo(int para);
}

use javah command to generate the function signature for your C++ method wrapper:

javah -jni -classpath bin/classes/ -d jni com.example.Your.Package.Class

Edit the code in C++

Go to your project folder, run command:

$ANDROID_NDK/ndk-build

where $ANDROID_NDK is the folder where you installed android NDK

That is pretty much it. For more details, you might read NDK or JNI documentation.