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readme: Update and add detailed steps to build instructions (#1865)

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Currently, the build instructions are very brief and don't explain the
whole process of setting up the build environment in detail. Thus, add
explicit steps on how to download required tools and prepare then for
compilation.

Signed-off-by: Tomasz Wilczyński <twilczynski@naver.com>
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tomasz1986 2023-01-02 09:51:00 +01:00 committed by GitHub
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@ -19,20 +19,62 @@ Language mappings are defined in `.tx/config`, with the second code being the on
# Building
### Dependencies
- Android SDK, with `$ANDROID_HOME` pointing to it (you can skip this if you are using Android Studio)
- Android NDK (you should install the required version (`ext.ndkVersionShared` in `./build.gradle`) with the usual tools, such that it's located within `$ANDROID_HOME/ndk/`).
- Go (see [here](https://docs.syncthing.net/dev/building.html#prerequisites) for the required version)
- Java Version 11 (you scan skip this if you are using Android Studio, otherwise you might need to set `$JAVA_HOME` accordingly)
These dependencies and instructions are necessary for building from the command
line. If you build using Docker or Android Studio, you don't need to set up and
follow them separately.
### Build instructions
## Dependencies
Make sure you clone the project with
`git clone https://github.com/syncthing/syncthing-android.git --recursive`. Alternatively, run
`git submodule init && git submodule update` in the project folder.
1. Android SDK and NDK
1. Download SDK command line tools from https://developer.android.com/studio#command-line-tools-only.
2. Unpack the downloaded archive to an empty folder. This path is going
to become your `ANDROID_HOME` folder.
3. Inside the unpacked `cmdline-tools` folder, create yet another folder
called `latest`, then move everything else inside it, so that the final
folder hierarchy looks as follows.
```
cmdline-tools/latest/bin
cmdline-tools/latest/lib
cmdline-tools/latest/source.properties
cmdline-tools/latest/NOTICE.txt
```
4. Navigate inside `cmdline-tools/latest/bin`, then execute
```
./sdkmanager "platform-tools" "build-tools;<version>" "platforms;android-<version>" "extras;android;m2repository" "ndk;<version>"
```
The required tools and NDK will be downloaded automatically.
Build Syncthing using `./gradlew buildNative`. Then use `./gradlew assembleDebug` or
Android Studio to build the apk.
**NOTE:** You should check [Dockerfile](docker/Dockerfile) for the
specific version numbers to insert in the command above.
2. Go (see https://docs.syncthing.net/dev/building#prerequisites for the
required version)
3. Java version 11 (if not present in ``$PATH``, you might need to set
``$JAVA_HOME`` accordingly)
4. Python version 3
## Build instructions
1. Clone the project with
```
git clone https://github.com/syncthing/syncthing-android.git --recursive
```
Alternatively, if already present on the disk, run
```
git submodule init && git submodule update
```
in the project folder.
2. Make sure that the `ANDROID_HOME` environment variable is set to the path
containing the Android SDK (see [Dependecies](#dependencies)).
3. Navigate inside `syncthing-android`, then build the APK file with
```
./gradlew buildNative
./gradlew assembleDebug
```
4. Once completed, `app-debug.apk` will be present inside `app/build/outputs/apk/debug`.
**NOTE:** On Windows, you must use the Command Prompt (and not PowerShell) to
compile. When doing so, in the commands replace all forward slashes `/` with
backslashes `\`.
# License