JitPack Template

Description

A Jitpack project template which make publishing a general android library project to Jitpack easily

Usage

Gradle Dependency

• Project level build.gradle

allprojects {
    repositories {
        maven { url 'https://jitpack.io' }
    }
}

• App level build.gradle

dependencies {
    implementation 'com.github.yikuo123:Template-Jitpack:4d16276647'
}

JNI 使用说明

在 library 的 build.gradle 中添加 ndk 配置

android {
    defaultConfig {
        ndk {
            moduleName "Demo"
        }
        externalNativeBuild {
            cmake {
                cppFlags ""
            }
        }
    }
    externalNativeBuild {
        cmake {
            path "src/main/cpp/CMakeLists.txt"
        }
    }
}

添加 jni 接口

package com.ikecin.sdk.jni;
public class Demo {
    static {
        System.loadLibrary("Demo");
    }

    public static native String text();
}

进入 library 目录

以下的命令都是在 library 目录执行

使用 javac 编译成 class 文件

javac src/main/java/com/ikecin/sdk/jni/Demo.java -d ./build 

使用 javah 生成c头文件

javah -d src/main/cpp -classpath ./build com.ikecin.sdk.jni.Demo

library/main/cpp 下会自动生成头文件

编写C文件

创建同名c文件,实现头文件中的方法

构建

在library中创建文件 src/main/cpp/CMakeLists.txt

配置cmake，内容如下(详见Demo)

cmake_minimum_required(VERSION 3.4.1)

add_library( # Sets the name of the library.
        Demo

        # Sets the library as a shared library.
        SHARED

        # Provides a relative path to your source file(s).
        com_ikecin_sdk_jni_Demo.c)

find_library( # Sets the name of the path variable.
        log-lib

        # Specifies the name of the NDK library that
        # you want CMake to locate.
        log)

target_link_libraries( # Specifies the target library.
        Demo

        # Links the target library to the log library
        # included in the NDK.
        ${log-lib})

注意，要使用Linux的分割符，否则在JitPack构建会出错（Windows上使用Linux分隔符仍能正常编译）

配置混淆文件，排除jni方法

-keepclasseswithmembernames,includedescriptorclasses class * { native <methods>; }

其它参考

http://wiki.jikexueyuan.com/project/jni-ndk-developer-guide/