AndroidStudio编译so库

步骤

1.新建工程com.example.jnitest

2.新建JniTest.java (MainActivity同级目录下)

package com.example.jnitest;

public class JniTest {
    static {
        System.loadLibrary("JniTest");
    }
    public native static String getString();
}

3.Build->Make Project，在app的build目录生成.class文件

JniTest\app\build\intermediates\javac\debug\classes>

4.在步骤3目录下，运行javah命令生成.h文件

javah -jni -classpath . com.example.jnitest.JniTest

5.在app/src/main目录下新建一个jni文件夹

6.将生成的.h文件拷贝到步骤5中jni文件夹

7.在jni目录下，新建c/c++source file，如main.c，并实现.h中方法

#include "jni.h"
#include "com_example_jnitest_JniTest.h"

JNIEXPORT jstring JNICALL Java_com_example_jnitest_JniTest_getString(JNIEnv *env, jclass jz){
  return (*env)->NewStringUTF(env,"this is the first time for me to use jni");
}

8.在jni目录下，新建Android.mk和Application.mk文件

• Android.mk

LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)

LOCAL_MODULE := JniTest
LOCAL_SRC_FILES := main.c
include $(BUILD_SHARED_LIBRARY)

• Application.mk

APP_ABI := all

9.在jni目录下，运行命令ndk-build(需要将其加入到系统环境变量)，即可在src/main/libs目录下生成so

ndk-build

10.在build.gradle中添加字段

android {
    ...
    sourceSets {
        main() {
            jniLibs.srcDirs = ['src/main/libs']
            jni.srcDirs = [] //屏蔽掉默认的jni编译生成过程
        }
    }
}

11.在MainActivity中调用

public class MainActivity extends AppCompatActivity {
    private TextView mTextView;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mTextView = findViewById(R.id.txt);
    }

    public void btnClick(View v){
        mTextView.setText(JniTest.getString());
    }
}

12.整个工程截图

参考链接

https://blog.csdn.net/leilifengxingmw/article/details/71598687

本文地址：https://blog.csdn.net/robothj/article/details/107374692