feat: added companion app for WearOS, and setted up icons

mobile/build.gradle.kts

@@ -1,5 +1,6 @@
 plugins {
     alias(libs.plugins.android.application)
+    kotlin("plugin.serialization") version "2.2.20"
 }
 
 android {
@@ -47,4 +48,6 @@ dependencies {
     androidTestImplementation(libs.androidx.junit)
     implementation(libs.zxing.core)
     implementation(libs.zxing.android)
+    implementation("com.google.android.gms:play-services-wearable:18.1.0")
+    implementation("org.jetbrains.kotlinx:kotlinx-serialization-json:1.9.0")
 }

mobile/src/main/java/ru/omni_devel/cards/CardInfo.kt

@@ -1,7 +1,9 @@
 package ru.omni_devel.cards
 
 import com.google.zxing.BarcodeFormat
+import kotlinx.serialization.Serializable
 
+@Serializable
 class CardInfo (
     val id: Int,
     val name: String,

mobile/src/main/java/ru/omni_devel/cards/MainActivity.kt

@@ -7,11 +7,13 @@ import android.widget.Button
 import android.widget.LinearLayout
 import android.widget.PopupMenu
 import android.widget.TextView
+import android.widget.Toast
 import androidx.activity.enableEdgeToEdge
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowInsetsCompat
 import com.google.android.material.button.MaterialButton
+import kotlinx.serialization.json.Json
 import org.w3c.dom.Text
 
 class MainActivity : AppCompatActivity() {
@@ -32,9 +34,23 @@ class MainActivity : AppCompatActivity() {
         cardsList = findViewById(R.id.cardsList)
 
         val addCardButton: Button = findViewById(R.id.addCardButton)
+        val syncWithWearOSButton: Button = findViewById(R.id.syncWithWearOSButton)
+
         addCardButton.setOnClickListener {
             startActivity(Intent(this, AddCardActivity::class.java))
         }
+
+        syncWithWearOSButton.setOnClickListener {
+            Toast.makeText(this, "Sync in progress...", Toast.LENGTH_SHORT).show()
+
+            val isSuccess = sendToWatch(this, "/updateCards", Json.encodeToString(db.getCards()))
+
+            if (isSuccess) {
+                Toast.makeText(this, "Synced!", Toast.LENGTH_SHORT).show()
+            } else {
+                Toast.makeText(this, "Sync failed! Please, check your connection", Toast.LENGTH_LONG).show()
+            }
+        }
     }
 
     override fun onResume() {

mobile/src/main/java/ru/omni_devel/cards/Utils.kt

@@ -1,6 +1,9 @@
 package ru.omni_devel.cards
 
+import android.content.Context
 import android.graphics.Bitmap
+import android.widget.Toast
+import com.google.android.gms.wearable.Wearable
 import com.google.zxing.BarcodeFormat
 import com.google.zxing.MultiFormatWriter
 import com.journeyapps.barcodescanner.BarcodeEncoder
@@ -11,3 +14,29 @@ fun generateCode(value: String, format: BarcodeFormat): Bitmap {
 
     return BarcodeEncoder().createBitmap(matrix)
 }
+
+fun sendToWatch(context: Context, path: String, message: String): Boolean {
+    val nodeClient = Wearable.getNodeClient(context)
+
+    var isSuccess = false
+
+    nodeClient.connectedNodes.addOnSuccessListener { nodes ->
+        if (nodes.isEmpty()) {
+            Toast.makeText(context, "Watch is not connected", Toast.LENGTH_SHORT).show()
+
+            return@addOnSuccessListener
+        }
+
+        nodes.forEach { node ->
+            Wearable.getMessageClient(context).sendMessage(
+                node.id,
+                path,
+                message.toByteArray(Charsets.UTF_8)
+            ).addOnSuccessListener {
+                isSuccess = true
+            }
+        }
+    }
+
+    return isSuccess
+}

mobile/src/main/res/layout/activity_main.xml

@@ -58,4 +58,16 @@
         app:layout_constraintBottom_toBottomOf="parent"
         app:layout_constraintEnd_toEndOf="parent" />
 
+    <Button
+        android:id="@+id/syncWithWearOSButton"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:layout_marginEnd="16dp"
+        android:backgroundTint="#0E000000"
+        android:text="Sync with WearOS"
+        app:cornerRadius="12dp"
+        app:layout_constraintBottom_toBottomOf="@+id/toolbar"
+        app:layout_constraintEnd_toEndOf="@+id/toolbar"
+        app:layout_constraintTop_toTopOf="@+id/toolbar" />
+
 </androidx.constraintlayout.widget.ConstraintLayout>

mobile/src/main/res/mipmap-anydpi-v26/ic_launcher.xml

@@ -0,0 +1,21 @@
+<!--
+  ~ Copyright (C) 2026 The Android Open Source Project
+  ~
+  ~ 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
+  ~
+  ~      http://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.
+  -->
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

mobile/src/main/res/mipmap-anydpi-v26/ic_launcher_round.xml

@@ -0,0 +1,21 @@
+<!--
+  ~ Copyright (C) 2026 The Android Open Source Project
+  ~
+  ~ 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
+  ~
+  ~      http://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.
+  -->
+<?xml version="1.0" encoding="utf-8"?>
+<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
+    <background android:drawable="@color/ic_launcher_background"/>
+    <foreground android:drawable="@mipmap/ic_launcher_foreground"/>
+    <monochrome android:drawable="@mipmap/ic_launcher_foreground"/>
+</adaptive-icon>

mobile/src/main/res/mipmap-anydpi/ic_launcher.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
-    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
-</adaptive-icon>

mobile/src/main/res/mipmap-anydpi/ic_launcher_round.xml

@@ -1,6 +0,0 @@
-<?xml version="1.0" encoding="utf-8"?>
-<adaptive-icon xmlns:android="http://schemas.android.com/apk/res/android">
-    <background android:drawable="@drawable/ic_launcher_background" />
-    <foreground android:drawable="@drawable/ic_launcher_foreground" />
-    <monochrome android:drawable="@drawable/ic_launcher_foreground" />
-</adaptive-icon>

mobile/src/main/res/values/ic_launcher_background.xml

@@ -0,0 +1,19 @@
+<!--
+  ~ Copyright (C) 2026 The Android Open Source Project
+  ~
+  ~ 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
+  ~
+  ~      http://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.
+  -->
+<?xml version="1.0" encoding="utf-8"?>
+<resources>
+    <color name="ic_launcher_background">#000000</color>
+</resources>