Update README.md

A build.gradle for armeabi-v7a with NDK

Author: Mainvooid

README.md

@@ -1,11 +1,45 @@
 # opencv-android-sdk-with-contrib
-
 opencv341 android sdk with contrib341 module build on windows.
 
 天知道在windows上编译这俩个库要趟过多少坑。
 
 工作需要，目前主要编译了armeabi-v7a的.so库.a库，主要用于jni编程，附带java应用层函数。
 
-### 欢迎补充支持其他CPU架构的动态库和静态库，并修改好.mk文件
 
+## A build.gradle for armeabi-v7a with NDK
+apply plugin: 'com.android.library'
+android {
+    compileSdkVersion 23
 
+    defaultConfig {
+        minSdkVersion 21
+        targetSdkVersion 23
+        versionCode 1
+        versionName "1.0"
+        //配置NDK信息
+        ndk {
+            moduleName "opencv3"
+            ldLibs "log", "jnigraphics", "m", "z"
+            abiFilters "armeabi-v7a"
+        }
+        //配置SO文件存放地址
+        sourceSets {
+            main {
+                jni.srcDirs = []
+                jniLibs.srcDirs = ['src/main/libs']
+            }
+        }
+    }
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
+        }
+    }
+    //设置构建脚本路径
+    externalNativeBuild {
+        ndkBuild {
+            path 'src/main/jni/Android.mk'
+        }
+    }
+}