1.配置Anroid Studio(這步是關鍵)
使用[command+,] 打開Preferences,選擇External Tools,點選加号框如下圖:
Paste_Image.png
點選+号之後,打開Macros 配置宏指令界面,如下圖:
Paste_Image.png
setting.png
javah.png
ndk-build.png
ndk-build clean.png
2.配置完成就可以使用javah 、ndk-build、ndk-build clean這三個指令了,那麼在哪裡使用這些指令,請看下圖
tools.png
3.配置完成,我們開始建立工程MyNdk,然後建立jni目錄
create jni.png
4.修改app下的build.gradle檔案, 如下圖
ndk{
moduleName "MyLibrary"
}
sourceSets.main{
jni.srcDirs = []
jniLibs.srcDir "src/main/libs"
}
app build.gradle.png
5.修改MyNdk下的gradle.properties檔案(如果沒有此檔案,自己建立一個),如下圖
MyNdk gradle.properties.png
6.建立MyNdk.java
public class MyNdk {
static {
System.loadLibrary("MyLibrary");
}
public native String getString();
}
MyNdk.java.png
7.這步開始建立頭檔案,操作如下圖(注意在MyNdk.java檔案上點選右鍵)
create com_zhangyp_higo_myndk_MyNdk.h file.png
8.執行完成後jni目錄下就建立了com_zhangyp_higo_myndk_MyNdk.h檔案,然後我們在jni目錄下編寫 MyLibrary.cpp、Android.mk、Application.mk這三個檔案,代碼如下:
jni files.png
com_zhangyp_higo_myndk_MyNdk.h
/* DO NOT EDIT THIS FILE - it is machine generated */
#include <jni.h>
/* Header for class com_zhangyp_higo_myndk_MyNdk */
#ifndef _Included_com_zhangyp_higo_myndk_MyNdk
#define _Included_com_zhangyp_higo_myndk_MyNdk
#ifdef __cplusplus
extern "C" {
#endif
/*
* Class: com_zhangyp_higo_myndk_MyNdk
* Method: getString
* Signature: ()Ljava/lang/String;
*/
JNIEXPORT jstring JNICALL Java_com_zhangyp_higo_myndk_MyNdk_getString
(JNIEnv *, jobject);
#ifdef __cplusplus
}
#endif
#endif
MyLibrary.cpp
#include "com_zhangyp_higo_myndk_MyNdk.h"
JNIEXPORT jstring JNICALL Java_com_zhangyp_higo_myndk_MyNdk_getString
(JNIEnv * env, jobject obj){
return (*env).NewStringUTF("This is mylibrary !!!");
}
Android.mk
LOCAL_PATH := $(call my-dir)
include $(CLEAR_VARS)
LOCAL_MODULE := MyLibrary
LOCAL_SRC_FILES =: MyLibrary.cpp
include $(BUILD_SHARED_LIBRARY)
Application.mk
APP_MODULES := MyLibrary
APP_ABI := all
9.如何執行ndk-build,請看下圖:(注意在jni目錄上點選右鍵)
make ndk-build .png
10.得到so檔案,如下圖
so file.png
12.在MainActivity中調用,代碼如下
public class MainActivity extends AppCompatActivity {
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
TextView tv = (TextView) findViewById(R.id.tv);
tv.setText(new MyNdk().getString());
}
}
12.大功告成,可以運作了,oh yet!
文/zzyyppqq(簡書作者)
原文連結:http://www.jianshu.com/p/e689d0196a17
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