Android - stereoboy/Study GitHub Wiki

NDK Official Samples

• https://github.com/android/ndk-samples

Android Revision History

• Android API Levels
  • https://apilevels.com/
• Android Gradle Plugin History for Compatibility
  • https://developer.android.com/build/releases/past-releases
• MVN Repository Version History
  • https://mvnrepository.com/artifact/com.android.tools.build/gradle
• NDK

  • NDK Github

    • https://github.com/android/ndk

  • NDK Changelog Archive

    • https://github.com/android/ndk/wiki/Changelog-r21

  • Revision History

    • https://github.com/android/ndk/wiki/Unsupported-Downloads

  • Check Compatibility with Gradle, AGP, SDK Build Tools

    • https://developer.android.com/build/releases/past-releases/agp-4-2-0-release-notes

$ adb shell getprop ro.build.version.release
13
$ adb shell getprop ro.build.version.sdk
33
$ adb shell getprop
[aaudio.hw_burst_min_usec]: [2000]
[aaudio.mmap_exclusive_policy]: [1]
...

• Android ADB commands to get the device properties
  • https://stackoverflow.com/questions/21099301/android-adb-commands-to-get-the-device-properties

Samples

• gst-tools-android
  • https://github.com/stereoboy/gst-tools-android/wiki
• gst-docs
  • https://github.com/stereoboy/gst-docs/wiki/
• gstreamer_samples/android
  • https://github.com/stereoboy/gstreamer_samples/wiki/Android

Java Setup

• reference: https://developer.android.com/build/jdks
• Oracle Java install
  • https://www.cherryservers.com/blog/how-to-install-java-on-ubuntu
• OpenJDK Install
  • https://www.digitalocean.com/community/tutorials/how-to-install-java-with-apt-on-ubuntu-22-04

JAVA_HOME setup

sudo update-alternatives --config java
There are 3 choices for the alternative java (providing /usr/bin/java).

  Selection    Path                                         Priority   Status
------------------------------------------------------------
  0            /usr/lib/jvm/java-17-openjdk-amd64/bin/java   1711      auto mode
  1            /usr/lib/jvm/java-11-openjdk-amd64/bin/java   1111      manual mode
  2            /usr/lib/jvm/java-17-openjdk-amd64/bin/java   1711      manual mode
* 3            /usr/lib/jvm/java-17-oracle/bin/java          1091      manual mode

export JAVA_HOME=/usr/lib/jvm/java-17-oracle/

Build on command line

• https://developer.android.com/build/building-cmdline

gstreamer_samples/android (main)$ ./gradlew :stereo-video-udp:tasks --all

gstreamer_samples/android (main)$ ./gradlew :stereo-video-udp:clean

gstreamer_samples/android (main)$ ./gradlew :stereo-video-udp:build

gstreamer_samples/android (main)$ ./gradlew :stereo-video-udp:externalNativeBuildDebug

gstreamer_samples/android (main)$ ./gradlew :stereo-video-udp:generateJsonModelDebug --rerun-tasks

> Task :stereo-video-udp:generateJsonModelDebug
External native generate JSON debug: starting JSON generation
External native generate JSON debug: using platform version 21 for ABI X86_64 and min SDK version 21
External native generate JSON debug: JSON '/home/rofox/work/gstreamer_samples/android/stereo-video-udp/.externalNativeBuild/ndkBuild/debug/x86_64/android_gradle_build.json' was up-to-date
External native generate JSON debug: using platform version 21 for ABI X86 and min SDK version 21
External native generate JSON debug: JSON '/home/rofox/work/gstreamer_samples/android/stereo-video-udp/.externalNativeBuild/ndkBuild/debug/x86/android_gradle_build.json' was up-to-date
External native generate JSON debug: using platform version 21 for ABI ARMEABI_V7A and min SDK version 21
External native generate JSON debug: JSON '/home/rofox/work/gstreamer_samples/android/stereo-video-udp/.externalNativeBuild/ndkBuild/debug/armeabi-v7a/android_gradle_build.json' was up-to-date
External native generate JSON debug: using platform version 21 for ABI ARM64_V8A and min SDK version 21
External native generate JSON debug: JSON '/home/rofox/work/gstreamer_samples/android/stereo-video-udp/.externalNativeBuild/ndkBuild/debug/arm64-v8a/android_gradle_build.json' was up-to-date
External native generate JSON debug: JSON generation completed without problems

BUILD SUCCESSFUL in 0s
2 actionable tasks: 2 executed

Edit build.gradle

*https://stackoverflow.com/questions/40878923/in-gradle-how-to-print-out-a-message-in-the-console-event-log

gradlew --debug

gradlew --info

Utils

taskTree visualizer

• https://stackoverflow.com/questions/10422054/is-there-a-way-to-list-task-dependencies-in-gradle
• https://plugins.gradle.org/plugin/com.dorongold.task-tree/1.5