mediapipe/docs/getting_started/android.md

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MediaPipe on Android

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Please follow instructions below to build Android example apps in the supported MediaPipe solutions. To learn more about these example apps, start from Hello World! on Android.

To incorporate MediaPipe into Android Studio projects, see these instructions to use the MediaPipe Android Solution APIs (currently in alpha) that are now available in Google's Maven Repository.

Building Android example apps with Bazel

Prerequisite

• Install MediaPipe following these instructions.
• Setup Java Runtime.
• Setup Android SDK release 30.0.0 and above.
• Setup Android NDK version between 18 and 21.

MediaPipe recommends setting up Android SDK and NDK via Android Studio (and see below for Android Studio setup). However, if you prefer using MediaPipe without Android Studio, please run setup_android_sdk_and_ndk.sh to download and setup Android SDK and NDK before building any Android example apps.

If Android SDK and NDK are already installed (e.g., by Android Studio), set $ANDROID_HOME and $ANDROID_NDK_HOME to point to the installed SDK and NDK.

export ANDROID_HOME=<path to the Android SDK>
export ANDROID_NDK_HOME=<path to the Android NDK>

and add android_ndk_repository() and android_sdk_repository() rules into the WORKSPACE file as the following:

$ echo "android_sdk_repository(name = \"androidsdk\")" >> WORKSPACE
$ echo "android_ndk_repository(name = \"androidndk\", api_level=21)" >> WORKSPACE

In order to use MediaPipe on earlier Android versions, MediaPipe needs to switch to a lower Android API level. You can achieve this by specifying api_level = $YOUR_INTENDED_API_LEVEL in android_ndk_repository() and/or android_sdk_repository() in the WORKSPACE file.

Tip: You can run this script to build (and install) all MediaPipe Android example apps.

1. To build an Android example app, build against the corresponding android_binary build target. For instance, for MediaPipe Hands the target is handtrackinggpu in the BUILD file:

   Note: To reduce the binary size, consider appending --linkopt="-s" to the command below to strip symbols.

   bazel build -c opt --config=android_arm64 mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu:handtrackinggpu
   

2. Install it on a device with:

   adb install bazel-bin/mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu/handtrackinggpu.apk