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# Building n2n on Android
- Install jdk.
- Generate app keystore by the command `keytool -genkey -alias Hin2n -keystore Hin2n.jks`. And remember these two passwords:
```bash
keytool -genkey -dname "CN=Unknown,O=Unknown,C=Unknown" -keystore Hin2n.jks -keysize 1024 -alias Hin2nalias -validity 14000 -keypass yourpassword -storepass yourpassword
```
- Move `Hin2n.jks` to `android/Hin2n/app` directory. We will use this file to sign the application.
- In the file `app/build.gradle` replace `yourpassword` with the password used to generate the keystore.
- Download Android tools from https://developer.android.com/, and unzip it.
- Install Android development environment.
```bash
echo y | ./tools/bin/sdkmanager tools
echo y | ./tools/bin/sdkmanager platform-tools
echo y | ./tools/bin/sdkmanager ndk-bundle
echo y | ./tools/bin/sdkmanager "cmake;3.6.4111459"
echo y | ./tools/bin/sdkmanager "lldb;3.1"
```
- Set environment variables.
```bash
export ANDROID_HOME=YOUE_ANDROID_DEV_HOME
export ANDROID_NDK_HOME=\$ANDROID_HOME/ndk-bundle
export HIN2N_KSTOREPWD=YOUR_APP_KEYSTORE_PASSWORD
export HIN2N_KEYPWD=YOUR_APP_KEY_PASSWORD
```
- Compile the app.
```bash
cd android/Hin2n
./gradlew assemble
```
- You will get the app in `android/Hin2n/app/build/outputs/apk/` directory.