Android Studio生成so库及运行

环境要求：Android Studio可跑动的前提下，下载好NDK并配置好ndk环境变量

1. 在Module中build.gradle文件中添加ndk配置信息

apply plugin: 'com.android.application'

android {
    compileSdkVersion 25
    buildToolsVersion "25.0.2"

    defaultConfig {
        applicationId "com.example.myapplication"
        minSdkVersion 15
        targetSdkVersion 25
        versionCode 1
        versionName "1.0"
        ndk {//ndk配置
            moduleName "jni_test"
            ldLibs "log", "z", "m"
            abiFilters "armeabi", "armeabi-v7a", "x86"
        }

        testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"

    }
    buildTypes {
        release {
            minifyEnabled false
            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
        }
    }
}

dependencies {
    compile fileTree(dir: 'libs', include: ['*.jar'])

    androidTestCompile('com.android.support.test.espresso:espresso-core:2.2.2', {
        exclude group: 'com.android.support', module: 'support-annotations'
    })
    compile 'com.android.support:appcompat-v7:25.0.1'
    testCompile 'junit:junit:4.12'
}

2. 配置gradle.properties文件，添加android.useDeprecatedNdk=true

3.编写调用jni方法的类JniUtil

public class JniUtil {

    static {
        System.loadLibrary("jni_test");//名字要与build.gradle文件中配置一致
    }

    public static native String getString();
}

4. 添加External Tools

File —> Settings —> Tools —> External Tools —> +

这里写图片描述

5. 生成.h文件

右键JniUtil文件 —> External Tools —> javah -jni

6. 更改文件名为main.c并编写c代码，供android调用（最好是命名为main）

/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_example_yinhua_myapplication_utils_NativeUtil */

#ifndef _Included_com_example_yinhua_myapplication_utils_NativeUtil
#define _Included_com_example_yinhua_myapplication_utils_NativeUtil
#ifdef __cplusplus
extern "C" {
#endif
/*
 * Class:     com_example_yinhua_myapplication_utils_NativeUtil
 * Method:    getStringFromNative
 * Signature: ()Ljava/lang/String;
 */
JNIEXPORT jstring JNICALL Java_com_example_yinhua_myapplication_utils_NativeUtil_getStringFromNative (JNIEnv *env, jclass obj){
    return (*env)->NewStringUTF(env, "Hello World!!!");
}
#ifdef __cplusplus
}
#endif
#endif

extern “C”是使用C的编译和连接，避免c和c++之间不兼容导致的错误

#ifndef _Included_com_example_yinhua_myapplication_utils_NativeUtil
#define _Included_com_example_yinhua_myapplication_utils_NativeUtil

为了保证各个模块的独立,编译时第一次看到main.h文件，它的内容会被读取且给定_Included_com_example_yinhua_myapplication_utils_NativeUtil一个值。之后再次看到main.h文件时，_Included_com_example_yinhua_myapplication_utils_NativeUtil就已经定义了，main.h的内容就不会再次被读取了。

7. Sync 和Build Project后，android调用，即实现效果

Android Studio生成so库及运行

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