chore: Initial commit

18 files changed, 819 insertions, 0 deletions

diff --git a/.gitignore b/.gitignore
new file mode 100644
index 0000000..f14eedc
--- /dev/null
+++ b/.gitignore
@@ -0,0 +1,6 @@
+.gradle
+build/
+local.properties
+*.iml
+gradle.properties
+.idea/
diff --git a/README.md b/README.md
new file mode 100644
index 0000000..48c7483
--- /dev/null
+++ b/README.md
@@ -0,0 +1,20 @@
+# zwzn-freefit-android
+
+Android companion app for zwzn/freefit watches.
+
+## Setup
+
+You need the Gradle wrapper JAR to build. Run once:
+```
+gradle wrapper --gradle-version 8.4
+```
+Or if you installed gradle8 from AUR:
+```
+gradle8 wrapper --gradle-version 8.4
+```
+
+Then build and deploy to your phone:
+```
+./gradlew assembleDebug
+adb install app/build/outputs/apk/debug/app-debug.apk
+```
diff --git a/app/build.gradle.kts b/app/build.gradle.kts
new file mode 100644
index 0000000..e79455f
--- /dev/null
+++ b/app/build.gradle.kts
@@ -0,0 +1,36 @@
+plugins {
+    alias(libs.plugins.android.application)
+    alias(libs.plugins.kotlin.android)
+}
+
+android {
+    namespace = "com.arslaancodes.zwznfreefit"
+    compileSdk = 35
+
+    defaultConfig {
+        applicationId = "com.arslaancodes.zwznfreefit"
+        minSdk = 26
+        targetSdk = 35
+        versionCode = 1
+        versionName = "1.0"
+    }
+
+    buildTypes {
+        release {
+            isMinifyEnabled = false
+        }
+    }
+    compileOptions {
+        sourceCompatibility = JavaVersion.VERSION_1_8
+        targetCompatibility = JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = "1.8"
+    }
+}
+
+dependencies {
+    implementation(libs.androidx.core.ktx)
+    implementation(libs.androidx.appcompat)
+    implementation(libs.material)
+}
diff --git a/app/src/main/AndroidManifest.xml b/app/src/main/AndroidManifest.xml
new file mode 100644
index 0000000..af11ef6
--- /dev/null
+++ b/app/src/main/AndroidManifest.xml
@@ -0,0 +1,25 @@
+<?xml version="1.0" encoding="utf-8"?>
+<manifest xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <uses-permission android:name="android.permission.BLUETOOTH" />
+    <uses-permission android:name="android.permission.BLUETOOTH_ADMIN" />
+    <uses-permission android:name="android.permission.BLUETOOTH_CONNECT" />
+    <uses-permission android:name="android.permission.BLUETOOTH_SCAN" />
+    <uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
+
+    <application
+        android:allowBackup="true"
+        android:label="zwzn-freefit"
+        android:theme="@style/Theme.AppCompat.NoActionBar">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+	<activity android:name=".DeviceActivity" android:exported="true" android:theme="@style/Theme.AppCompat.NoActionBar"/>
+    </application>
+
+</manifest>
diff --git a/app/src/main/java/com/arslaancodes/zwznfreefit/BleManager.kt b/app/src/main/java/com/arslaancodes/zwznfreefit/BleManager.kt
new file mode 100644
index 0000000..c138ead
--- /dev/null
+++ b/app/src/main/java/com/arslaancodes/zwznfreefit/BleManager.kt
@@ -0,0 +1,121 @@
+package com.arslaancodes.zwznfreefit
+
+import android.bluetooth.*
+import android.bluetooth.le.*
+import android.content.Context
+import android.os.ParcelUuid
+import java.util.UUID
+
+val SERVICE_UUID = UUID.fromString("6E40FC00-B5A3-F393-E0A9-E50E24DCCA9E")
+val WRITE_UUID   = UUID.fromString("6E40FC20-B5A3-F393-E0A9-E50E24DCCA9E")
+val NOTIFY_UUID  = UUID.fromString("6E40FC21-B5A3-F393-E0A9-E50E24DCCA9E")
+
+class BleManager(private val context: Context) {
+	companion object {
+		lateinit var instance: BleManager
+	}
+
+	init {
+		instance = this
+	}
+
+	private val adapter = BluetoothAdapter.getDefaultAdapter()
+	private var gatt: BluetoothGatt? = null
+	private var onNotify: ((ByteArray) -> Unit)? = null
+
+	fun scan(onFound: (BluetoothDevice) -> Unit) {
+		val scanner = adapter.bluetoothLeScanner
+		android.util.Log.d("BLE", "Starting scan, scanner=$scanner")
+		if (scanner == null) {
+			android.util.Log.e("BLE", "Scanner is null! Bluetooth off?")
+			return
+		}
+		val settings = ScanSettings.Builder().build()
+		scanner.startScan(null, settings, object : ScanCallback() {
+			override fun onScanResult(callbackType: Int, result: ScanResult) {
+				android.util.Log.d("BLE", "Found: ${result.device.name} ${result.device.address}")
+				onFound(result.device)
+			}
+			override fun onScanFailed(errorCode: Int) {
+				android.util.Log.e("BLE", "Scan failed: $errorCode")
+			}
+		})
+	}
+
+	fun connect(device: BluetoothDevice, onConnected: (BluetoothGatt) -> Unit) {
+		gatt = device.connectGatt(context, false, object : BluetoothGattCallback() {
+			override fun onConnectionStateChange(g: BluetoothGatt, status: Int, newState: Int) {
+				if (newState == BluetoothProfile.STATE_CONNECTED) {
+					g.discoverServices()
+				}
+			}
+			override fun onServicesDiscovered(g: BluetoothGatt, status: Int) {
+				val notifyChar = g.getService(SERVICE_UUID)?.getCharacteristic(NOTIFY_UUID)
+				if (notifyChar != null) {
+					g.setCharacteristicNotification(notifyChar, true)
+					val descriptor = notifyChar.getDescriptor(
+						UUID.fromString("00002902-0000-1000-8000-00805f9b34fb")
+					)
+					descriptor?.value = BluetoothGattDescriptor.ENABLE_NOTIFICATION_VALUE
+					g.writeDescriptor(descriptor)
+				}
+				onConnected(g)
+			}
+			override fun onCharacteristicChanged(g: BluetoothGatt, characteristic: BluetoothGattCharacteristic) {
+				if (characteristic.uuid == NOTIFY_UUID) {
+					onNotify?.invoke(characteristic.value)
+				}
+			}
+		})
+	}
+
+	fun write(data: ByteArray) {
+		val char = gatt?.getService(SERVICE_UUID)?.getCharacteristic(WRITE_UUID)
+		char?.value = data
+		gatt?.writeCharacteristic(char)
+	}
+
+	fun syncTime() {
+		val now = System.currentTimeMillis() / 1000
+		val tzOffset = java.util.TimeZone.getDefault().getOffset(System.currentTimeMillis()) / 1000
+
+		val packet = ByteArray(12)
+		packet[0] = 0x01
+		packet[1] = (now shr 24).toByte()
+		packet[2] = (now shr 16).toByte()
+		packet[3] = (now shr 8).toByte()
+		packet[4] = now.toByte()
+		packet[5] = (tzOffset shr 24).toByte()
+		packet[6] = (tzOffset shr 16).toByte()
+		packet[7] = (tzOffset shr 8).toByte()
+		packet[8] = tzOffset.toByte()
+		packet[9] = 0x00
+		packet[10] = 0x00 // language code, 0 = english
+		packet[11] = 0x00
+
+		write(packet)
+	}
+
+	fun switchFindBand(flag: Int) {
+		// find/vibrate band 
+		// these functions are usually named after their freefit/ferefit counterparts
+		val packet = ByteArray(2)
+		packet[0] = 0x51 // command
+		packet[1] = flag.toByte() // 0x01 = start, 0x00 = stop
+		write(packet)
+	}
+
+	fun configRealTimeMeasure(type: Int, start: Boolean, onResult: (ByteArray) -> Unit) {
+		// measure heart rate/other stuff
+		// confirmed working types so far is just 0x00 for heart rate, will RE more later
+		// yet again, function named after freefit counterparts from RE'd protocol/decompiled APKs
+		// all code in this file is intellectual property of Arslaan Pathan, no pieces of decompiled freefit code have been used anywhere in the app
+		// freefit decompilation was merely used as a reference for reverse-engineering the protocol
+		onNotify = onResult
+		val packet = ByteArray(3)
+		packet[0] = 0x60.toByte()
+		packet[1] = type.toByte()
+		packet[2] = if (start) 0x01.toByte() else 0x00.toByte()
+		write(packet)
+	}
+}
diff --git a/app/src/main/java/com/arslaancodes/zwznfreefit/DeviceActivity.kt b/app/src/main/java/com/arslaancodes/zwznfreefit/DeviceActivity.kt
new file mode 100644
index 0000000..38862bd
--- /dev/null
+++ b/app/src/main/java/com/arslaancodes/zwznfreefit/DeviceActivity.kt
@@ -0,0 +1,73 @@
+package com.arslaancodes.zwznfreefit
+
+import android.bluetooth.BluetoothAdapter
+import android.os.Bundle
+import android.widget.TextView
+import android.widget.Button
+import androidx.appcompat.app.AppCompatActivity
+
+class DeviceActivity : AppCompatActivity() {
+	private lateinit var statusText: TextView
+	private val handler = android.os.Handler(android.os.Looper.getMainLooper())
+	private val syncRunnable = object : Runnable {
+		override fun run() {
+			BleManager.instance.syncTime()
+			handler.postDelayed(this, 5 * 60 * 1000)
+		}
+	}
+
+	override fun onResume() {
+		super.onResume()
+		handler.post(syncRunnable)
+	}
+
+	override fun onPause() {
+		super.onPause()
+		handler.removeCallbacks(syncRunnable)
+	}
+
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+		setContentView(R.layout.activity_device)
+		window.decorView.systemUiVisibility = (
+			android.view.View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+			or android.view.View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+		)
+
+		val address = intent.getStringExtra("device_address")
+		val device = BluetoothAdapter.getDefaultAdapter().getRemoteDevice(address)
+
+		statusText = findViewById(R.id.deviceStatusText)
+		statusText.text = "Connected to: ${device.name ?: device.address}"
+		BleManager.instance.syncTime();
+		findViewById<Button>(R.id.syncTimeButton).setOnClickListener {
+			BleManager.instance.syncTime()
+		}
+
+		findViewById<Button>(R.id.findBandButton).setOnClickListener {
+			BleManager.instance.switchFindBand(0x01)
+		}
+
+		findViewById<Button>(R.id.stopFindBandButton).setOnClickListener {
+			BleManager.instance.switchFindBand(0x00)
+		}
+
+		findViewById<Button>(R.id.configRealTimeMeasureHeartRateButton).setOnClickListener {
+			BleManager.instance.configRealTimeMeasure(0x00, true, { data ->
+				runOnUiThread {
+					if (data[0] == 0x94.toByte()) {
+						val heartRate = data[1].toInt() and 0xFF
+						statusText.text = "Got generic measurement ${heartRate}"
+					}
+					if (data[0] == 0xE1.toByte()) {
+						val rate1 = data[1].toInt() and 0xFF
+						val rate2 = data[5].toInt() and 0xFF
+						val rate3 = data[6].toInt() and 0xFF
+						val rate4 = data[7].toInt() and 0xFF
+						statusText.text = "Got aggregate rates ${rate1}, ${rate2}, ${rate3}, ${rate4}"
+					}
+				}
+			})
+		}
+	}
+}
diff --git a/app/src/main/java/com/arslaancodes/zwznfreefit/MainActivity.kt b/app/src/main/java/com/arslaancodes/zwznfreefit/MainActivity.kt
new file mode 100644
index 0000000..59bff65
--- /dev/null
+++ b/app/src/main/java/com/arslaancodes/zwznfreefit/MainActivity.kt
@@ -0,0 +1,75 @@
+package com.arslaancodes.zwznfreefit
+
+import android.Manifest
+import android.bluetooth.BluetoothDevice
+import android.content.pm.PackageManager
+import android.os.Bundle
+import android.widget.*
+import androidx.appcompat.app.AppCompatActivity
+import androidx.core.app.ActivityCompat
+import android.content.Intent
+
+class MainActivity : AppCompatActivity() {
+	private lateinit var bleManager: BleManager
+	private lateinit var statusText: TextView
+	private lateinit var scanButton: Button
+	private lateinit var deviceList: ListView
+
+	private val devices = mutableListOf<BluetoothDevice>()
+	private val deviceNames = mutableListOf<String>()
+	private lateinit var adapter: ArrayAdapter<String>
+
+	override fun onCreate(savedInstanceState: Bundle?) {
+		super.onCreate(savedInstanceState)
+		setContentView(R.layout.activity_main)
+		window.decorView.systemUiVisibility = (
+			android.view.View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
+			or android.view.View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY
+		)
+
+		bleManager = BleManager(this)
+		statusText = findViewById(R.id.statusText)
+		scanButton = findViewById(R.id.scanButton)
+		deviceList = findViewById(R.id.deviceList)
+
+		adapter = ArrayAdapter(this, android.R.layout.simple_list_item_1, deviceNames)
+		deviceList.adapter = adapter
+
+		deviceList.setOnItemClickListener { _, _, position, _ ->
+			val device = devices[position]
+			statusText.text = "Connecting to ${device.name ?: device.address}..."
+			bleManager.connect(device) {
+				runOnUiThread {
+					val intent = Intent(this, DeviceActivity::class.java)
+					intent.putExtra("device_address", device.address)
+					startActivity(intent)
+				}
+			}
+		}
+
+		scanButton.setOnClickListener {
+			if (ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_SCAN) != PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(this, Manifest.permission.ACCESS_FINE_LOCATION) != PackageManager.PERMISSION_GRANTED || ActivityCompat.checkSelfPermission(this, Manifest.permission.BLUETOOTH_CONNECT) != PackageManager.PERMISSION_GRANTED) {
+				ActivityCompat.requestPermissions(this,
+					arrayOf(
+						Manifest.permission.BLUETOOTH_SCAN,
+						Manifest.permission.BLUETOOTH_CONNECT,
+						Manifest.permission.ACCESS_FINE_LOCATION
+					), 1)
+				return@setOnClickListener
+			}
+			devices.clear()
+			deviceNames.clear()
+			adapter.notifyDataSetChanged()
+			statusText.text = "Scanning..."
+			bleManager.scan { device ->
+				runOnUiThread {
+					if (devices.none { it.address == device.address }) {
+						devices.add(device)
+						deviceNames.add(device.name ?: device.address)
+						adapter.notifyDataSetChanged()
+					}
+				}
+			}
+		}
+	}
+}
diff --git a/app/src/main/res/layout/activity_device.xml b/app/src/main/res/layout/activity_device.xml
new file mode 100644
index 0000000..1364066
--- /dev/null
+++ b/app/src/main/res/layout/activity_device.xml
@@ -0,0 +1,49 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:orientation="vertical"
+	android:padding="24dp"
+	android:background="#1e1e2f">
+
+	<TextView
+		android:id="@+id/deviceStatusText"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:textSize="18sp"/>
+
+	<Button
+		android:id="@+id/syncTimeButton"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="16dp"
+		android:text="Sync Time (syncTime)"/>
+
+	<Button
+		android:id="@+id/findBandButton"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="16dp"
+		android:text="Find Watch (switchFindBand 0x01)"/>
+
+	<Button
+		android:id="@+id/stopFindBandButton"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="16dp"
+		android:text="Stop Finding Watch (switchFindBand 0x00)"/>
+
+	<Button
+		android:id="@+id/configRealTimeMeasureHeartRateButton"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="16dp"
+		android:text="Measure Heart Rate (configRealTimeMeasure type=0x00 start=false)"/>
+
+	<Button
+		android:id="@+id/stopConfigRealTimeMeasureHeartRateButton"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="16dp"
+		android:text="Stop Measuring Heart Rate (configRealTimeMeasure type=0x00 start=false)"/>
+</LinearLayout>
diff --git a/app/src/main/res/layout/activity_main.xml b/app/src/main/res/layout/activity_main.xml
new file mode 100644
index 0000000..e70aa4c
--- /dev/null
+++ b/app/src/main/res/layout/activity_main.xml
@@ -0,0 +1,28 @@
+<?xml version="1.0" encoding="utf-8"?>
+<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
+	android:layout_width="match_parent"
+	android:layout_height="match_parent"
+	android:orientation="vertical"
+	android:background="#1e1e2f"
+	android:padding="24dp">
+
+	<Button
+		android:id="@+id/scanButton"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:text="Scan"/>
+
+	<TextView
+		android:id="@+id/statusText"
+		android:layout_width="wrap_content"
+		android:layout_height="wrap_content"
+		android:layout_marginTop="8dp"
+		android:text=""/>
+
+	<ListView
+		android:id="@+id/deviceList"
+		android:layout_width="match_parent"
+		android:layout_height="match_parent"
+		android:layout_marginTop="16dp"/>
+
+</LinearLayout>
diff --git a/app/src/main/res/values/strings.xml b/app/src/main/res/values/strings.xml
new file mode 100644
index 0000000..439573b
--- /dev/null
+++ b/app/src/main/res/values/strings.xml
@@ -0,0 +1,3 @@
+<resources>
+    <string name="app_name">zwzn-freefit</string>
+</resources>
diff --git a/build.gradle.kts b/build.gradle.kts
new file mode 100644
index 0000000..7629126
--- /dev/null
+++ b/build.gradle.kts
@@ -0,0 +1,4 @@
+plugins {
+    alias(libs.plugins.android.application) apply false
+    alias(libs.plugins.kotlin.android) apply false
+}
diff --git a/gradle-8.4-bin.zip b/gradle-8.4-bin.zip
new file mode 100644
index 0000000..abc45a6
--- /dev/null
+++ b/gradle-8.4-bin.zip
diff --git a/gradle/libs.versions.toml b/gradle/libs.versions.toml
new file mode 100644
index 0000000..d311b7f
--- /dev/null
+++ b/gradle/libs.versions.toml
@@ -0,0 +1,15 @@
+[versions]
+agp = "8.3.0"
+kotlin = "1.9.22"
+coreKtx = "1.12.0"
+appcompat = "1.6.1"
+material = "1.11.0"
+
+[libraries]
+androidx-core-ktx = { group = "androidx.core", name = "core-ktx", version.ref = "coreKtx" }
+androidx-appcompat = { group = "androidx.appcompat", name = "appcompat", version.ref = "appcompat" }
+material = { group = "com.google.android.material", name = "material", version.ref = "material" }
+
+[plugins]
+android-application = { id = "com.android.application", version.ref = "agp" }
+kotlin-android = { id = "org.jetbrains.kotlin.android", version.ref = "kotlin" }
diff --git a/gradle/wrapper/gradle-wrapper.jar b/gradle/wrapper/gradle-wrapper.jar
new file mode 100644
index 0000000..7f93135
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.jar
diff --git a/gradle/wrapper/gradle-wrapper.properties b/gradle/wrapper/gradle-wrapper.properties
new file mode 100644
index 0000000..3fa8f86
--- /dev/null
+++ b/gradle/wrapper/gradle-wrapper.properties
@@ -0,0 +1,7 @@
+distributionBase=GRADLE_USER_HOME
+distributionPath=wrapper/dists
+distributionUrl=https\://services.gradle.org/distributions/gradle-8.4-bin.zip
+networkTimeout=10000
+validateDistributionUrl=true
+zipStoreBase=GRADLE_USER_HOME
+zipStorePath=wrapper/dists
diff --git a/gradlew b/gradlew
new file mode 100755
index 0000000..1aa94a4
--- /dev/null
+++ b/gradlew
@@ -0,0 +1,249 @@
+#!/bin/sh
+
+#
+# Copyright © 2015-2021 the original authors.
+#
+# Licensed under the Apache License, Version 2.0 (the "License");
+# you may not use this file except in compliance with the License.
+# You may obtain a copy of the License at
+#
+#      https://www.apache.org/licenses/LICENSE-2.0
+#
+# Unless required by applicable law or agreed to in writing, software
+# distributed under the License is distributed on an "AS IS" BASIS,
+# WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+# See the License for the specific language governing permissions and
+# limitations under the License.
+#
+
+##############################################################################
+#
+#   Gradle start up script for POSIX generated by Gradle.
+#
+#   Important for running:
+#
+#   (1) You need a POSIX-compliant shell to run this script. If your /bin/sh is
+#       noncompliant, but you have some other compliant shell such as ksh or
+#       bash, then to run this script, type that shell name before the whole
+#       command line, like:
+#
+#           ksh Gradle
+#
+#       Busybox and similar reduced shells will NOT work, because this script
+#       requires all of these POSIX shell features:
+#         * functions;
+#         * expansions «$var», «${var}», «${var:-default}», «${var+SET}»,
+#           «${var#prefix}», «${var%suffix}», and «$( cmd )»;
+#         * compound commands having a testable exit status, especially «case»;
+#         * various built-in commands including «command», «set», and «ulimit».
+#
+#   Important for patching:
+#
+#   (2) This script targets any POSIX shell, so it avoids extensions provided
+#       by Bash, Ksh, etc; in particular arrays are avoided.
+#
+#       The "traditional" practice of packing multiple parameters into a
+#       space-separated string is a well documented source of bugs and security
+#       problems, so this is (mostly) avoided, by progressively accumulating
+#       options in "$@", and eventually passing that to Java.
+#
+#       Where the inherited environment variables (DEFAULT_JVM_OPTS, JAVA_OPTS,
+#       and GRADLE_OPTS) rely on word-splitting, this is performed explicitly;
+#       see the in-line comments for details.
+#
+#       There are tweaks for specific operating systems such as AIX, CygWin,
+#       Darwin, MinGW, and NonStop.
+#
+#   (3) This script is generated from the Groovy template
+#       https://github.com/gradle/gradle/blob/HEAD/subprojects/plugins/src/main/resources/org/gradle/api/internal/plugins/unixStartScript.txt
+#       within the Gradle project.
+#
+#       You can find Gradle at https://github.com/gradle/gradle/.
+#
+##############################################################################
+
+# Attempt to set APP_HOME
+
+# Resolve links: $0 may be a link
+app_path=$0
+
+# Need this for daisy-chained symlinks.
+while
+    APP_HOME=${app_path%"${app_path##*/}"}  # leaves a trailing /; empty if no leading path
+    [ -h "$app_path" ]
+do
+    ls=$( ls -ld "$app_path" )
+    link=${ls#*' -> '}
+    case $link in             #(
+      /*)   app_path=$link ;; #(
+      *)    app_path=$APP_HOME$link ;;
+    esac
+done
+
+# This is normally unused
+# shellcheck disable=SC2034
+APP_BASE_NAME=${0##*/}
+# Discard cd standard output in case $CDPATH is set (https://github.com/gradle/gradle/issues/25036)
+APP_HOME=$( cd "${APP_HOME:-./}" > /dev/null && pwd -P ) || exit
+
+# Use the maximum available, or set MAX_FD != -1 to use that value.
+MAX_FD=maximum
+
+warn () {
+    echo "$*"
+} >&2
+
+die () {
+    echo
+    echo "$*"
+    echo
+    exit 1
+} >&2
+
+# OS specific support (must be 'true' or 'false').
+cygwin=false
+msys=false
+darwin=false
+nonstop=false
+case "$( uname )" in                #(
+  CYGWIN* )         cygwin=true  ;; #(
+  Darwin* )         darwin=true  ;; #(
+  MSYS* | MINGW* )  msys=true    ;; #(
+  NONSTOP* )        nonstop=true ;;
+esac
+
+CLASSPATH=$APP_HOME/gradle/wrapper/gradle-wrapper.jar
+
+
+# Determine the Java command to use to start the JVM.
+if [ -n "$JAVA_HOME" ] ; then
+    if [ -x "$JAVA_HOME/jre/sh/java" ] ; then
+        # IBM's JDK on AIX uses strange locations for the executables
+        JAVACMD=$JAVA_HOME/jre/sh/java
+    else
+        JAVACMD=$JAVA_HOME/bin/java
+    fi
+    if [ ! -x "$JAVACMD" ] ; then
+        die "ERROR: JAVA_HOME is set to an invalid directory: $JAVA_HOME
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+else
+    JAVACMD=java
+    if ! command -v java >/dev/null 2>&1
+    then
+        die "ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.
+
+Please set the JAVA_HOME variable in your environment to match the
+location of your Java installation."
+    fi
+fi
+
+# Increase the maximum file descriptors if we can.
+if ! "$cygwin" && ! "$darwin" && ! "$nonstop" ; then
+    case $MAX_FD in #(
+      max*)
+        # In POSIX sh, ulimit -H is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        MAX_FD=$( ulimit -H -n ) ||
+            warn "Could not query maximum file descriptor limit"
+    esac
+    case $MAX_FD in  #(
+      '' | soft) :;; #(
+      *)
+        # In POSIX sh, ulimit -n is undefined. That's why the result is checked to see if it worked.
+        # shellcheck disable=SC2039,SC3045
+        ulimit -n "$MAX_FD" ||
+            warn "Could not set maximum file descriptor limit to $MAX_FD"
+    esac
+fi
+
+# Collect all arguments for the java command, stacking in reverse order:
+#   * args from the command line
+#   * the main class name
+#   * -classpath
+#   * -D...appname settings
+#   * --module-path (only if needed)
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, and GRADLE_OPTS environment variables.
+
+# For Cygwin or MSYS, switch paths to Windows format before running java
+if "$cygwin" || "$msys" ; then
+    APP_HOME=$( cygpath --path --mixed "$APP_HOME" )
+    CLASSPATH=$( cygpath --path --mixed "$CLASSPATH" )
+
+    JAVACMD=$( cygpath --unix "$JAVACMD" )
+
+    # Now convert the arguments - kludge to limit ourselves to /bin/sh
+    for arg do
+        if
+            case $arg in                                #(
+              -*)   false ;;                            # don't mess with options #(
+              /?*)  t=${arg#/} t=/${t%%/*}              # looks like a POSIX filepath
+                    [ -e "$t" ] ;;                      #(
+              *)    false ;;
+            esac
+        then
+            arg=$( cygpath --path --ignore --mixed "$arg" )
+        fi
+        # Roll the args list around exactly as many times as the number of
+        # args, so each arg winds up back in the position where it started, but
+        # possibly modified.
+        #
+        # NB: a `for` loop captures its iteration list before it begins, so
+        # changing the positional parameters here affects neither the number of
+        # iterations, nor the values presented in `arg`.
+        shift                   # remove old arg
+        set -- "$@" "$arg"      # push replacement arg
+    done
+fi
+
+
+# Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.
+DEFAULT_JVM_OPTS='"-Xmx64m" "-Xms64m"'
+
+# Collect all arguments for the java command:
+#   * DEFAULT_JVM_OPTS, JAVA_OPTS, JAVA_OPTS, and optsEnvironmentVar are not allowed to contain shell fragments,
+#     and any embedded shellness will be escaped.
+#   * For example: A user cannot expect ${Hostname} to be expanded, as it is an environment variable and will be
+#     treated as '${Hostname}' itself on the command line.
+
+set -- \
+        "-Dorg.gradle.appname=$APP_BASE_NAME" \
+        -classpath "$CLASSPATH" \
+        org.gradle.wrapper.GradleWrapperMain \
+        "$@"
+
+# Stop when "xargs" is not available.
+if ! command -v xargs >/dev/null 2>&1
+then
+    die "xargs is not available"
+fi
+
+# Use "xargs" to parse quoted args.
+#
+# With -n1 it outputs one arg per line, with the quotes and backslashes removed.
+#
+# In Bash we could simply go:
+#
+#   readarray ARGS < <( xargs -n1 <<<"$var" ) &&
+#   set -- "${ARGS[@]}" "$@"
+#
+# but POSIX shell has neither arrays nor command substitution, so instead we
+# post-process each arg (as a line of input to sed) to backslash-escape any
+# character that might be a shell metacharacter, then use eval to reverse
+# that process (while maintaining the separation between arguments), and wrap
+# the whole thing up as a single "set" statement.
+#
+# This will of course break if any of these variables contains a newline or
+# an unmatched quote.
+#
+
+eval "set -- $(
+        printf '%s\n' "$DEFAULT_JVM_OPTS $JAVA_OPTS $GRADLE_OPTS" |
+        xargs -n1 |
+        sed ' s~[^-[:alnum:]+,./:=@_]~\\&~g; ' |
+        tr '\n' ' '
+    )" '"$@"'
+
+exec "$JAVACMD" "$@"
diff --git a/gradlew.bat b/gradlew.bat
new file mode 100644
index 0000000..6689b85
--- /dev/null
+++ b/gradlew.bat
@@ -0,0 +1,92 @@
+@rem

+@rem Copyright 2015 the original author or authors.

+@rem

+@rem Licensed under the Apache License, Version 2.0 (the "License");

+@rem you may not use this file except in compliance with the License.

+@rem You may obtain a copy of the License at

+@rem

+@rem      https://www.apache.org/licenses/LICENSE-2.0

+@rem

+@rem Unless required by applicable law or agreed to in writing, software

+@rem distributed under the License is distributed on an "AS IS" BASIS,

+@rem WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.

+@rem See the License for the specific language governing permissions and

+@rem limitations under the License.

+@rem

+

+@if "%DEBUG%"=="" @echo off

+@rem ##########################################################################

+@rem

+@rem  Gradle startup script for Windows

+@rem

+@rem ##########################################################################

+

+@rem Set local scope for the variables with windows NT shell

+if "%OS%"=="Windows_NT" setlocal

+

+set DIRNAME=%~dp0

+if "%DIRNAME%"=="" set DIRNAME=.

+@rem This is normally unused

+set APP_BASE_NAME=%~n0

+set APP_HOME=%DIRNAME%

+

+@rem Resolve any "." and ".." in APP_HOME to make it shorter.

+for %%i in ("%APP_HOME%") do set APP_HOME=%%~fi

+

+@rem Add default JVM options here. You can also use JAVA_OPTS and GRADLE_OPTS to pass JVM options to this script.

+set DEFAULT_JVM_OPTS="-Xmx64m" "-Xms64m"

+

+@rem Find java.exe

+if defined JAVA_HOME goto findJavaFromJavaHome

+

+set JAVA_EXE=java.exe

+%JAVA_EXE% -version >NUL 2>&1

+if %ERRORLEVEL% equ 0 goto execute

+

+echo.

+echo ERROR: JAVA_HOME is not set and no 'java' command could be found in your PATH.

+echo.

+echo Please set the JAVA_HOME variable in your environment to match the

+echo location of your Java installation.

+

+goto fail

+

+:findJavaFromJavaHome

+set JAVA_HOME=%JAVA_HOME:"=%

+set JAVA_EXE=%JAVA_HOME%/bin/java.exe

+

+if exist "%JAVA_EXE%" goto execute

+

+echo.

+echo ERROR: JAVA_HOME is set to an invalid directory: %JAVA_HOME%

+echo.

+echo Please set the JAVA_HOME variable in your environment to match the

+echo location of your Java installation.

+

+goto fail

+

+:execute

+@rem Setup the command line

+

+set CLASSPATH=%APP_HOME%\gradle\wrapper\gradle-wrapper.jar

+

+

+@rem Execute Gradle

+"%JAVA_EXE%" %DEFAULT_JVM_OPTS% %JAVA_OPTS% %GRADLE_OPTS% "-Dorg.gradle.appname=%APP_BASE_NAME%" -classpath "%CLASSPATH%" org.gradle.wrapper.GradleWrapperMain %*

+

+:end

+@rem End local scope for the variables with windows NT shell

+if %ERRORLEVEL% equ 0 goto mainEnd

+

+:fail

+rem Set variable GRADLE_EXIT_CONSOLE if you need the _script_ return code instead of

+rem the _cmd.exe /c_ return code!

+set EXIT_CODE=%ERRORLEVEL%

+if %EXIT_CODE% equ 0 set EXIT_CODE=1

+if not ""=="%GRADLE_EXIT_CONSOLE%" exit %EXIT_CODE%

+exit /b %EXIT_CODE%

+

+:mainEnd

+if "%OS%"=="Windows_NT" endlocal

+

+:omega

diff --git a/settings.gradle.kts b/settings.gradle.kts
new file mode 100644
index 0000000..4ee4863
--- /dev/null
+++ b/settings.gradle.kts
@@ -0,0 +1,16 @@
+pluginManagement {
+    repositories {
+        google()
+        mavenCentral()
+        gradlePluginPortal()
+    }
+}
+dependencyResolutionManagement {
+    repositoriesMode.set(RepositoriesMode.FAIL_ON_PROJECT_REPOS)
+    repositories {
+        google()
+        mavenCentral()
+    }
+}
+rootProject.name = "zwzn-freefit-android"
+include(":app")