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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,191 @@ | ||
| --- | ||
| layout: default | ||
| title: MediaPipe on Android | ||
| parent: Getting Started | ||
| has_children: true | ||
| has_toc: false | ||
| nav_order: 1 | ||
| --- | ||
|
|
||
| # MediaPipe on Android | ||
| {: .no_toc } | ||
|
|
||
| 1. TOC | ||
| {:toc} | ||
| --- | ||
|
|
||
| Please follow instructions below to build Android example apps in the supported | ||
| MediaPipe [solutions](../solutions/solutions.md). To learn more about these | ||
| example apps, start from [Hello World! on Android](./hello_world_android.md). To | ||
| incorporate MediaPipe into an existing Android Studio project, see these | ||
| [instructions](./android_archive_library.md) that use Android Archive (AAR) and | ||
| Gradle. | ||
|
|
||
| ## Building Android example apps | ||
|
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| ### Prerequisite | ||
|
|
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| * Install MediaPipe following these [instructions](./install.md). | ||
| * Setup Java Runtime. | ||
| * Setup Android SDK release 28.0.3 and above. | ||
| * Setup Android NDK r18b and above. | ||
|
|
||
| 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`](https://github.com/google/mediapipe/blob/master/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. | ||
|
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| ```bash | ||
| export ANDROID_HOME=<path to the Android SDK> | ||
| export ANDROID_NDK_HOME=<path to the Android NDK> | ||
| ``` | ||
|
|
||
| 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`](https://github.com/google/mediapipe/blob/master/WORKSPACE) file. | ||
|
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||
| Please verify all the necessary packages are installed. | ||
|
|
||
| * Android SDK Platform API Level 28 or 29 | ||
| * Android SDK Build-Tools 28 or 29 | ||
| * Android SDK Platform-Tools 28 or 29 | ||
| * Android SDK Tools 26.1.1 | ||
| * Android NDK 17c or above | ||
|
|
||
| ### Option 1: Build with Bazel in Command Line | ||
|
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| Tip: You can run this | ||
| [script](https://github.com/google/mediapipe/blob/master/build_android_examples.sh) | ||
| 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](../solutions/hands.md) the target is `handtrackinggpu` in | ||
| the | ||
| [BUILD](https://github.com/google/mediapipe/tree/master/mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu/BUILD) | ||
| file: | ||
|
|
||
| Note: To reduce the binary size, consider appending `--linkopt="-s"` to the | ||
| command below to strip symbols. | ||
|
|
||
| ```bash | ||
| bazel build -c opt --config=android_arm64 mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu:handtrackinggpu | ||
| ``` | ||
|
|
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| 2. Install it on a device with: | ||
|
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| ```bash | ||
| adb install bazel-bin/mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu/handtrackinggpu.apk | ||
| ``` | ||
|
|
||
| ### Option 2: Build with Bazel in Android Studio | ||
|
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| The MediaPipe project can be imported into Android Studio using the Bazel | ||
| plugins. This allows the MediaPipe examples to be built and modified in Android | ||
| Studio. | ||
|
|
||
| To incorporate MediaPipe into an existing Android Studio project, see these | ||
| [instructions](./android_archive_library.md) that use Android Archive (AAR) and | ||
| Gradle. | ||
|
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||
| The steps below use Android Studio 3.5 to build and install a MediaPipe example | ||
| app: | ||
|
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| 1. Install and launch Android Studio 3.5. | ||
|
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| 2. Select `Configure` -> `SDK Manager` -> `SDK Platforms`. | ||
|
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| * Verify that Android SDK Platform API Level 28 or 29 is installed. | ||
| * Take note of the Android SDK Location, e.g., | ||
| `/usr/local/home/Android/Sdk`. | ||
|
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| 3. Select `Configure` -> `SDK Manager` -> `SDK Tools`. | ||
|
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| * Verify that Android SDK Build-Tools 28 or 29 is installed. | ||
| * Verify that Android SDK Platform-Tools 28 or 29 is installed. | ||
| * Verify that Android SDK Tools 26.1.1 is installed. | ||
| * Verify that Android NDK 17c or above is installed. | ||
| * Take note of the Android NDK Location, e.g., | ||
| `/usr/local/home/Android/Sdk/ndk-bundle` or | ||
| `/usr/local/home/Android/Sdk/ndk/20.0.5594570`. | ||
|
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| 4. Set environment variables `$ANDROID_HOME` and `$ANDROID_NDK_HOME` to point | ||
| to the installed SDK and NDK. | ||
|
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| ```bash | ||
| export ANDROID_HOME=/usr/local/home/Android/Sdk | ||
| # If the NDK libraries are installed by a previous version of Android Studio, do | ||
| export ANDROID_NDK_HOME=/usr/local/home/Android/Sdk/ndk-bundle | ||
| # If the NDK libraries are installed by Android Studio 3.5, do | ||
| export ANDROID_NDK_HOME=/usr/local/home/Android/Sdk/ndk/<version number> | ||
| ``` | ||
|
|
||
| 5. Select `Configure` -> `Plugins` to install `Bazel`. | ||
|
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| 6. On Linux, select `File` -> `Settings` -> `Bazel settings`. On macos, select | ||
| `Android Studio` -> `Preferences` -> `Bazel settings`. Then, modify `Bazel | ||
| binary location` to be the same as the output of `$ which bazel`. | ||
|
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| 7. Select `Import Bazel Project`. | ||
|
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| * Select `Workspace`: `/path/to/mediapipe` and select `Next`. | ||
| * Select `Generate from BUILD file`: `/path/to/mediapipe/BUILD` and select | ||
| `Next`. | ||
| * Modify `Project View` to be the following and select `Finish`. | ||
|
|
||
| ``` | ||
| directories: | ||
| # read project settings, e.g., .bazelrc | ||
| . | ||
| -mediapipe/objc | ||
| -mediapipe/examples/ios | ||
| targets: | ||
| //mediapipe/examples/android/...:all | ||
| //mediapipe/java/...:all | ||
| android_sdk_platform: android-29 | ||
| sync_flags: | ||
| --host_crosstool_top=@bazel_tools//tools/cpp:toolchain | ||
| ``` | ||
|
|
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| 8. Select `Bazel` -> `Sync` -> `Sync project with Build files`. | ||
|
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| Note: Even after doing step 4, if you still see the error: `"no such package | ||
| '@androidsdk//': Either the path attribute of android_sdk_repository or the | ||
| ANDROID_HOME environment variable must be set."`, please modify the | ||
| [`WORKSPACE`](https://github.com/google/mediapipe/blob/master/WORKSPACE) | ||
| file to point to your SDK and NDK library locations, as below: | ||
|
|
||
| ``` | ||
| android_sdk_repository( | ||
| name = "androidsdk", | ||
| path = "/path/to/android/sdk" | ||
| ) | ||
| android_ndk_repository( | ||
| name = "androidndk", | ||
| path = "/path/to/android/ndk" | ||
| ) | ||
| ``` | ||
|
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| 9. Connect an Android device to the workstation. | ||
|
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| 10. Select `Run...` -> `Edit Configurations...`. | ||
|
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| * Select `Templates` -> `Bazel Command`. | ||
| * Enter Target Expression: | ||
| `//mediapipe/examples/android/src/java/com/google/mediapipe/apps/handtrackinggpu:handtrackinggpu` | ||
| * Enter Bazel command: `mobile-install`. | ||
| * Enter Bazel flags: `-c opt --config=android_arm64`. | ||
| * Press the `[+]` button to add the new configuration. | ||
| * Select `Run` to run the example app on the connected Android device. |
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