88 lines
3.2 KiB
Markdown
88 lines
3.2 KiB
Markdown
---
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layout: default
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title: MediaPipe on Android
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parent: Getting Started
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has_children: true
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has_toc: false
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nav_order: 1
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---
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# MediaPipe on Android
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{: .no_toc }
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1. TOC
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{:toc}
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---
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Please follow instructions below to build Android example apps in the supported
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MediaPipe [solutions](../solutions/solutions.md). To learn more about these
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example apps, start from [Hello World! on Android](./hello_world_android.md).
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To incorporate MediaPipe into Android Studio projects, see these
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[instructions](./android_solutions.md) to use the MediaPipe Android Solution
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APIs (currently in alpha) that are now available in
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[Google's Maven Repository](https://maven.google.com/web/index.html?#com.google.mediapipe).
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## Building Android example apps with Bazel
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### Prerequisite
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* Install MediaPipe following these [instructions](./install.md).
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* Setup Java Runtime.
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* Setup Android SDK release 30.0.0 and above.
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* Setup Android NDK version between 18 and 21.
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MediaPipe recommends setting up Android SDK and NDK via Android Studio (and see
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below for Android Studio setup). However, if you prefer using MediaPipe without
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Android Studio, please run
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[`setup_android_sdk_and_ndk.sh`](https://github.com/google/mediapipe/blob/master/setup_android_sdk_and_ndk.sh)
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to download and setup Android SDK and NDK before building any Android example
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apps.
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If Android SDK and NDK are already installed (e.g., by Android Studio), set
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$ANDROID_HOME and $ANDROID_NDK_HOME to point to the installed SDK and NDK.
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```bash
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export ANDROID_HOME=<path to the Android SDK>
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export ANDROID_NDK_HOME=<path to the Android NDK>
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```
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and add android_ndk_repository() and android_sdk_repository() rules into the
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[`WORKSPACE`](https://github.com/google/mediapipe/blob/master/WORKSPACE) file as
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the following:
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```bash
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$ echo "android_sdk_repository(name = \"androidsdk\")" >> WORKSPACE
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$ echo "android_ndk_repository(name = \"androidndk\", api_level=21)" >> WORKSPACE
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```
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In order to use MediaPipe on earlier Android versions, MediaPipe needs to switch
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to a lower Android API level. You can achieve this by specifying `api_level =
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$YOUR_INTENDED_API_LEVEL` in android_ndk_repository() and/or
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android_sdk_repository() in the
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[`WORKSPACE`](https://github.com/google/mediapipe/blob/master/WORKSPACE) file.
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Tip: You can run this
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[script](https://github.com/google/mediapipe/blob/master/build_android_examples.sh)
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to build (and install) all MediaPipe Android example apps.
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1. To build an Android example app, build against the corresponding
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`android_binary` build target. For instance, for
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[MediaPipe Hands](../solutions/hands.md) the target is `handtrackinggpu` in
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the
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[BUILD](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu/BUILD)
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file:
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Note: To reduce the binary size, consider appending `--linkopt="-s"` to the
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command below to strip symbols.
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```bash
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bazel build -c opt --config=android_arm64 mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu:handtrackinggpu
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```
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2. Install it on a device with:
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```bash
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adb install bazel-bin/mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu/handtrackinggpu.apk
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```
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