artilla's blog

It is really frustrating to build OpenCV native code with new Android Studio. The new Android Studio doesn't use make files, instead, sets compile options in app's builde.gradle file. The new gradle experimental(0.6.0-beta4) has some changes in DSL. It uses '.add' function, not '+='. Look at Sample Project at github AndroidOpenCVNDKDemo . It use Android Studio 2.0 beta5, gradle-experimental:0.6.0-beta, and OpenCV 3.1.0. I hope this will save your time. Useful sites http://tools.android.com/tech-docs/new-build-system/gradle-experimental http://ph0b.com/new-android-studio-ndk-support/ https://github.com/joaopedronardari/OpenCV-AndroidSamples -- 2016.03.06 Updated step by step explanation for Android NDK http://web.guohuiwang.com/technical-notes/androidndk1

When Grandle build failed with Already disposed Module error, 1. close the project. 2. in project folder, ./gradlew clean 3. reopen the project http://stackoverflow.com/questions/27541838/android-studio-gradle-already-disposed-module

If to remove Log.x for release, set ProGuard in build.gradle as follow proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro' and add those to proguard-rules.pro   -assumenosideeffects class android.util.Log {       public static *** d(...);       ..   } Be careful, assumenosideeffects  make effect at optimization level, so you should use proguard-android-optimize.txt instead proguard-android.txt

https://rtyley.github.io/spongycastle/ gradle compile 'com.madgag.spongycastle:core:1.52.0.0' compile 'com.madgag.spongycastle:prov:1.52.0.0' compile 'com.madgag.spongycastle:pkix:1.52.0.0' compile 'com.madgag.spongycastle:pg:1.52.0.0'