在Android studio 2.2中配置NDK和开发

喜欢ヅ旅行 2022-07-10 10:27 168阅读 0赞

最近Android studio 2.2版本更新带来了一些改变，其中增强了C/C++的实现。对NDK的复杂安装进行了简化，使得在Android studio2.2中可以快速实现NDK的开发。  
  
  
如果使用CMake编译：  
  
  
步骤1：  
  
  
创建java本地方法类myndk.java：  
  
  
\[java\] view plain copy  
public class myndk \{  
public native String getstr();  
public native int getSums(int a,int b);  
public native int getSum();  
// Used to load the 'native-lib' library on application startup.  
static \{  
System.loadLibrary("native-lib");  
\}  
\}  
  
  
步骤2：  
使用命令：javah -jni com.example.cuboo.myapplication.myndk 创建myndk.java的头文件com\_example\_cuboo\_myapplication\_myndk.h  
  
  
(进入项目main/java目录后使用javah命令 )  
  
  
复制头文件到cpp目录下：  
  
  
Android视图下：隐藏了头文件  
  
  
  
  
project 视图下显示：  
  
  
  
  
  
  
步骤3：  
创建hello.cpp实现本地方法文件  
  
  
\[cpp\] view plain copy  
\#include <jni.h>  
\#include "com\_example\_cuboo\_myapplication\_myndk.h"  
  
  
JNIEXPORT jstring JNICALL  
Java\_com\_example\_cuboo\_myapplication\_myndk\_getstr(JNIEnv \*env, jobject instance) \{  
  
return env->NewStringUTF("hello ndk");  
\}  
  
JNIEXPORT jint JNICALL  
Java\_com\_example\_cuboo\_myapplication\_myndk\_getSum(JNIEnv \*env, jobject instance) \{  
  
return 8;  
\}  
  
JNIEXPORT jint JNICALL  
Java\_com\_example\_cuboo\_myapplication\_myndk\_getSums(JNIEnv \*env, jobject instance, jint a, jint b) \{  
return a+b;  
  
\}  
  
  
步骤4：  
把hello.app文件加入到CMakelists.text:  
\[plain\] view plain copy  
add\_library( \# Sets the name of the library.  
native-lib  
  
\# Sets the library as a shared library.  
SHARED  
  
\# Provides a relative path to your source file(s).  
\# Associated headers in the same location as their source  
\# file are automatically included.  
\#src/main/cpp/native-lib.cpp  
src/main/cpp/hello.cpp)