Android Studio CMake 生成多个so

最新推荐文章于 2024-07-18 11:48:41 发布

转载最新推荐文章于 2024-07-18 11:48:41 发布 · 337 阅读

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原文链接：http://www.cnblogs.com/mingfeng002/p/7201034.html

本文介绍了一个Android应用中加载并使用两个不同so库(one-lib和two-lib)的具体实现方式。通过CMakeLists.txt文件配置，实现了两个so库的独立编译与链接，并在Java层面对这些so库进行调用。每个so库提供了一个返回字符串的方法，最终在MainActivity中展示出调用结果。

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生成多个so案例

这里stringFromJNI和stringFromJNI11分别是调用one-lib和two-lib两个so

package com.test.ndkmoreso;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.TextView;

public class MainActivity extends AppCompatActivity {

    // Used to load the 'native-lib' library on application startup.
    static {
        System.loadLibrary("one-lib");
        System.loadLibrary("two-lib");
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        // Example of a call to a native method
        TextView tv = (TextView) findViewById(R.id.sample_text);
        tv.setText(stringFromJNI()+"   two"+stringFromJNI11());
    }

    /**
     * A native method that is implemented by the 'native-lib' native library,
     * which is packaged with this application.
     */
    public native String stringFromJNI();
    public native String stringFromJNI11();
}

cpp的目录结构:

直接看1的CMakeLists.txt文件

cmake_minimum_required(VERSION 3.4.1)

#添加子目录,将会调用子目录中的CMakeLists.txt

SET(ONE_PATH ${CMAKE_CURRENT_SOURCE_DIR}/src/main/cpp/one)
SET(TWO_PATH ${CMAKE_CURRENT_SOURCE_DIR}/src/main/cpp/two)

MESSAGE(STATUS “src  dir: ${CMAKE_CURRENT_SOURCE_DIR}”)

MESSAGE(STATUS “one  dir: ${ONE_PATH}”)
MESSAGE(STATUS “two  dir: ${TWO_PATH}”)

ADD_SUBDIRECTORY(${ONE_PATH})

ADD_SUBDIRECTORY(${TWO_PATH})

one的lib

2的CMakeLists.txt文件

cmake_minimum_required(VERSION 3.4.1)

#生成so动态库
ADD_LIBRARY(one-lib SHARED one.cpp)

target_link_libraries(one-lib log)

one.cpp

#include <jni.h>
#include <string>


extern "C"
JNIEXPORT jstring JNICALL
Java_com_test_ndkmoreso_MainActivity_stringFromJNI(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    return env->NewStringUTF(hello.c_str());
}

two的lib

查看3的CMakeLists.txt文件

cmake_minimum_required(VERSION 3.4.1)

#生成so动态库
ADD_LIBRARY(two-lib SHARED two.cpp)

target_link_libraries(two-lib log)

two.cpp

#include <jni.h>
#include <string>


extern "C"
JNIEXPORT jstring JNICALL
Java_com_test_ndkmoreso_MainActivity_stringFromJNI11(
        JNIEnv *env,
        jobject /* this */) {
    std::string hello = "Hello from C++";
    return env->NewStringUTF(hello.c_str());
}

生成的结果如下

转载于:https://www.cnblogs.com/mingfeng002/p/7201034.html