no element "ahcsrc" in webrtc Android example

[Ben Rush]

I'm stuck. It's likely because I'm not an Android developer by trade, but I
have been unable to figure out why things appear to build, but the Android
app is unable to find certain GStreamer plugins.

For me, I'm deploying the app to a Google Pixel 3a, Android 10.0, API 29. I
do a fresh pull from the current master of this:
https://github.com/centricular/gstwebrtc-demos. I've created for myself a
build environment in a docker container that seems to (at least, I thought)
work well for generating APKs from this project. When I interactively hop
onto the container and do a "gradle build", the project builds and I get
APKs. But when I deploy the resultant APK to my device and run it, I get an
error saying "Failed to parse launch: no element "ahcsrc"". Most instances
of this I've seen online have to do with a poorly written Android.mk file
in the src/main/jni directory. But I don't know if that's the case here
since it seems to check out.

I suppose the only potential issue is that I'm building this on Windows,
but I'm doing so under a WSL2-based docker container.

To reproduce what I'm doing,

1) do a git pull on the above repository. \
2) build an image using the Dockerfile at the end of this email.
3) Start a container with it. I do the following:

docker run -v d:/repos/gstwebrtc-demos/android:/code -it --name
gstreamer_builder brush/gstreamer_android /bin/bash

4) I then "cd" to /code once I'm in the container and type "gradle build".

The APKs that are built exhibit this issue.

Here is the Dockerfile:

FROM ubuntu:latest
USER root

# Install Build Essentials
# Install OpenJDK-8
# Fix certificate issues
ENV DEBIAN_FRONTEND=noninteractive

RUN apt-get update && \
apt-get install unzip && \
apt-get install build-essential -y && \
apt-get install wget -y && \
apt-get install file -y && \
apt-get install apt-utils -y && \
apt-get install vim -y && \
apt-get install pkg-config -y && \
apt-get install curl -y && \
apt-get install -y openjdk-8-jdk && \
    apt-get install -y ant && \
apt-get install ca-certificates-java && \
apt-get install git -y && \
    apt-get clean && \
update-ca-certificates -f;

# Setup JAVA_HOME -- useful for docker commandline
ENV JAVA_HOME /usr/lib/jvm/java-8-openjdk-amd64/
RUN export JAVA_HOME

ENV GRADLE_VERSION 4.6
ENV GRADLE_SDK_URL
https://services.gradle.org/distributions/gradle-${GRADLE_VERSION}-bin.zip
RUN mkdir /usr/local/gradle
RUN curl -sSL "${GRADLE_SDK_URL}" -o gradle-${GRADLE_VERSION}-bin.zip  \
&& unzip gradle-${GRADLE_VERSION}-bin.zip -d /usr/local/gradle  \
&& rm -rf gradle-${GRADLE_VERSION}-bin.zip
ENV GRADLE_HOME /usr/local/gradle/gradle-${GRADLE_VERSION}
ENV PATH ${GRADLE_HOME}/bin:$PATH

ENV SDK_URL="
https://dl.google.com/android/repository/sdk-tools-linux-3859397.zip" \
    ANDROID_HOME="/usr/local/android-sdk" \
    ANDROID_VERSION=28 \
    ANDROID_BUILD_TOOLS_VERSION=27.0.3
# Download Android SDK
RUN mkdir "$ANDROID_HOME" .android \
    && cd "$ANDROID_HOME" \
    && curl -o sdk.zip $SDK_URL \
    && unzip sdk.zip \
    && rm sdk.zip \
    && mkdir "$ANDROID_HOME/licenses" || true \
    && echo "24333f8a63b6825ea9c5514f83c2829b004d1fee" >
"$ANDROID_HOME/licenses/android-sdk-license"
#    && yes | $ANDROID_HOME/tools/bin/sdkmanager --licenses
# Install Android Build Tool and Libraries
RUN $ANDROID_HOME/tools/bin/sdkmanager --update
RUN $ANDROID_HOME/tools/bin/sdkmanager
"build-tools;${ANDROID_BUILD_TOOLS_VERSION}" \
    "platforms;android-${ANDROID_VERSION}" \
    "platform-tools"

# Android NDK
ENV ANDROID_NDK_VERSION r21b
ENV ANDROID_NDK_URL
http://dl.google.com/android/repository/android-ndk-${ANDROID_NDK_VERSION}-linux-x86_64.zip
RUN curl -L "${ANDROID_NDK_URL}" -o
android-ndk-${ANDROID_NDK_VERSION}-linux-x86_64.zip
RUN unzip android-ndk-${ANDROID_NDK_VERSION}-linux-x86_64.zip -d
/usr/local/android-ndk-${ANDROID_NDK_VERSION}
RUN rm -rf android-ndk-${ANDROID_NDK_VERSION}-linux-x86_64.zip
ENV ANDROID_NDK_HOME /usr/local/android-ndk-${ANDROID_NDK_VERSION}
ENV PATH ${ANDROID_NDK_HOME}:$PATH
#RUN chmod u+x ${ANDROID_NDK_HOME}/ -R

ENV GSTREAMER_ANDROID_VERSION 1.16.1
RUN mkdir /usr/local/gstreamer
RUN curl -L
https://gstreamer.freedesktop.org/data/pkg/android/1.16.1/gstreamer-1.0-android-universal-${GSTREAMER_ANDROID_VERSION}.tar.xz
-o
/usr/local/gstreamer/gstreamer-1.0-android-universal-${GSTREAMER_ANDROID_VERSION}.tar.xz
RUN tar -xf
/usr/local/gstreamer/gstreamer-1.0-android-universal-${GSTREAMER_ANDROID_VERSION}.tar.xz
-C /usr/local/gstreamer/
RUN rm -fr
/usr/local/gstreamer/gstreamer-1.0-android-universal-${GSTREAMER_ANDROID_VERSION}.tar.xz
ENV GSTREAMER_ROOT_ANDROID /usr/local/gstreamer/
ENV PATH ${GSTREAMER_ROOT_ANDROID}:$PATH
ENV PATH /usr/local/gstreamer/armv7/include/gstreamer-1.0:$PATH
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