diff --git a/.travis.yml b/.travis.yml
index 5fe9942769..6322fbade6 100644
--- a/.travis.yml
+++ b/.travis.yml
@@ -15,6 +15,7 @@ env:
   # overrides requirements to skip `peewee` pure python module, see:
   # https://github.com/kivy/python-for-android/issues/1263#issuecomment-390421054
   - COMMAND='. venv/bin/activate && cd testapps/ && python setup_testapp_python2_sqlite_openssl.py apk --sdk-dir /opt/android/android-sdk --ndk-dir /opt/android/android-ndk --requirements sdl2,pyjnius,kivy,python2,openssl,requests,sqlite3'
+  - COMMAND='. venv/bin/activate && cd testapps/ && python setup_testapp_python3.py apk --sdk-dir /opt/android/android-sdk --ndk-dir /opt/android/crystax-ndk'
 
 script:
   - docker run p4a /bin/sh -c "$COMMAND"
diff --git a/Dockerfile b/Dockerfile
index 183b972b2d..50bdd1859f 100644
--- a/Dockerfile
+++ b/Dockerfile
@@ -16,21 +16,27 @@ FROM ubuntu:16.04
 
 # get the latest version from https://developer.android.com/ndk/downloads/index.html
 ENV ANDROID_NDK_VERSION="16b"
+# get the latest version from https://www.crystax.net/en/download
+ENV CRYSTAX_NDK_VERSION="10.3.2"
 # get the latest version from https://developer.android.com/studio/index.html
 ENV ANDROID_SDK_TOOLS_VERSION="3859397"
 
 ENV ANDROID_HOME="/opt/android"
 ENV ANDROID_NDK_HOME="${ANDROID_HOME}/android-ndk" \
+	CRYSTAX_NDK_HOME="${ANDROID_HOME}/crystax-ndk" \
 	ANDROID_SDK_HOME="${ANDROID_HOME}/android-sdk"
-ENV ANDROID_NDK_HOME_V="${ANDROID_NDK_HOME}-r${ANDROID_NDK_VERSION}"
+ENV ANDROID_NDK_HOME_V="${ANDROID_NDK_HOME}-r${ANDROID_NDK_VERSION}" \
+	CRYSTAX_NDK_HOME_V="${CRYSTAX_NDK_HOME}-${CRYSTAX_NDK_VERSION}"
 ENV ANDROID_NDK_ARCHIVE="android-ndk-r${ANDROID_NDK_VERSION}-linux-x86_64.zip" \
+	CRYSTAX_NDK_ARCHIVE="crystax-ndk-${CRYSTAX_NDK_VERSION}-linux-x86.tar.xz" \
 	ANDROID_SDK_TOOLS_ARCHIVE="sdk-tools-linux-${ANDROID_SDK_TOOLS_VERSION}.zip"
 ENV ANDROID_NDK_DL_URL="https://dl.google.com/android/repository/${ANDROID_NDK_ARCHIVE}" \
+	CRYSTAX_NDK_DL_URL="https://eu.crystax.net/download/${CRYSTAX_NDK_ARCHIVE}" \
 	ANDROID_SDK_TOOLS_DL_URL="https://dl.google.com/android/repository/${ANDROID_SDK_TOOLS_ARCHIVE}"
 
 # install system dependencies
 RUN apt update -qq && apt install -qq --yes --no-install-recommends \
-	python virtualenv python-pip wget curl lbzip2 patch
+	python virtualenv python-pip wget curl lbzip2 patch bsdtar
 
 # build dependencies
 # https://buildozer.readthedocs.io/en/latest/installation.html#android-on-ubuntu-16-04-64bit
@@ -41,13 +47,27 @@ RUN dpkg --add-architecture i386 &&  apt update -qq && apt install -qq --yes --n
 RUN	pip install --quiet --upgrade cython==0.21
 
 # download and install Android NDK
-RUN curl --progress-bar "${ANDROID_NDK_DL_URL}" --output "${ANDROID_NDK_ARCHIVE}" && \
+RUN curl --location --progress-bar "${ANDROID_NDK_DL_URL}" --output "${ANDROID_NDK_ARCHIVE}" && \
     mkdir --parents "${ANDROID_NDK_HOME_V}" && \
     unzip -q "${ANDROID_NDK_ARCHIVE}" -d "${ANDROID_HOME}" && \
 	ln -sfn "${ANDROID_NDK_HOME_V}" "${ANDROID_NDK_HOME}"
 
+# download and install CrystaX NDK
+# added `gnutls_handshake` flag to workaround random `gnutls_handshake()` issues
+RUN curl --location --progress-bar "${CRYSTAX_NDK_DL_URL}" --output "${CRYSTAX_NDK_ARCHIVE}" --insecure && \
+    bsdtar -xf "${CRYSTAX_NDK_ARCHIVE}" --directory "${ANDROID_HOME}" \
+    --exclude=crystax-ndk-${CRYSTAX_NDK_VERSION}/docs \
+    --exclude=crystax-ndk-${CRYSTAX_NDK_VERSION}/samples \
+    --exclude=crystax-ndk-${CRYSTAX_NDK_VERSION}/tests \
+    --exclude=crystax-ndk-${CRYSTAX_NDK_VERSION}/toolchains/renderscript \
+    --exclude=crystax-ndk-${CRYSTAX_NDK_VERSION}/toolchains/x86_64-* \
+    --exclude=crystax-ndk-${CRYSTAX_NDK_VERSION}/toolchains/llvm-* \
+    --exclude=crystax-ndk-${CRYSTAX_NDK_VERSION}/toolchains/aarch64-* \
+    --exclude=crystax-ndk-${CRYSTAX_NDK_VERSION}/toolchains/mips64el-* && \
+	ln -sfn "${CRYSTAX_NDK_HOME_V}" "${CRYSTAX_NDK_HOME}"
+
 # download and install Android SDK
-RUN curl --progress-bar "${ANDROID_SDK_TOOLS_DL_URL}" --output "${ANDROID_SDK_TOOLS_ARCHIVE}" && \
+RUN curl --location --progress-bar "${ANDROID_SDK_TOOLS_DL_URL}" --output "${ANDROID_SDK_TOOLS_ARCHIVE}" && \
     mkdir --parents "${ANDROID_SDK_HOME}" && \
     unzip -q "${ANDROID_SDK_TOOLS_ARCHIVE}" -d "${ANDROID_SDK_HOME}"