Android(安卓)JNI技术， NDK开发

直接贴代码，JNI开发步骤：

1.写native方法

/**

* 解密单个文件

* @param src_filename

* @param des_filename

* @param password

* @return

public native int decryptFile(String src_filename,String des_filename, String password);

2.生成.h头文件

cd /Users/duqian/AndroidMac/workspace/OairEncryptFiles/bin/classes

javah -jni com.duqian.jni.OairDataProvider

3.c实现逻辑部分

实现以上生成的.h文件,部分代码

* Class: com_duqian_jni_OairDataProvider

* Method: decryptFile

* Signature: (Ljava/lang/String;Ljava/lang/String;Ljava/lang/String;)I

JNIEXPORT jint JNICALL Java_com_duqian_jni_OairDataProvider_decryptFile(

JNIEnv * env,jobject obj,jstring src_path,jstring des_path,jstring pwd) {

char* src_filename = Jstring2CStr(env, src_path);

char* des_filename = Jstring2CStr(env, des_path);

char* password = Jstring2CStr(env, pwd);

return q_decrypt_file(src_filename, des_filename, password);

}

4.交叉编译，生成.so文件。

---Android.mk文件

LOCAL_PATH := $(call my-dir)

include $(CLEAR_VARS)

LOCAL_MODULE := duqian_encryption

LOCAL_SRC_FILES := duqian_encryption.c

LOCAL_LDLIBS :=-llog

include $(BUILD_SHARED_LIBRARY)

编译命令：

ndk-build

5.调用本地方法

private static String libName = "duqian_encryption";

static {

System.loadLibrary(libName);

}

public void testJni(){

int result = decryptFile("c:\\a.jpg","d:\\b.jpg", "password");

//加密结果

}

在android代码中使用native方法进行文件加解密，调用的是c代码，比较安全。

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