Android JNI entry 4-android. mk File Analysis

The android. mk file is a required file for compiling C code using ndk. The Android. mk file describes which c files will be compiled and how to compile them. To understand how to compile Android. mk files, you can master the keywords that will be used in them. Let's take a look at a simple example. This example uses the android ndk

Example of helljni.

LOCAL_PATH := $(call my-dir)include $(CLEAR_VARS)LOCAL_MODULE    := hello-jniLOCAL_SRC_FILES := hello-jni.cinclude $(BUILD_SHARED_LIBRARY)

 

Local_path is the root directory of all c files to be compiled. The value $ (call my-DIR) indicates that the root directory is the directory where Android. mk is located.

 

Include $ (clear_vars) indicates that the global variables used in the compiling environment are cleared when the ndk compilation tool is used, such as local_module and local_src_files, because android may be called multiple times during an ndk compilation process. the global variables used in the MK file may change. I have read the following complex examples for this question and may understand it.

 

Local_module is part of the name when the library is finally generated, and the prefix lib and suffix. So is the name libhello-jni.so of the generated shared library.

 

Local_src_files indicates the name of the C file to be compiled

 

Include $ (build_shared_library) indicates that some shared libraries will be generated during ndk compilation.

 

 

Refer:

 

Makefile (Android. mk) in Android Compiling System

 

Android makefile (Android. mk) analysis (sequence)

 

Android. mk usage and basics

 

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* @ Author Zhang xingye
* Email: xy-Zhang # 163.com
* Android Development Group: 278401545
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