[WIP] Implement WiFi Network List RecyclerView UI

.gitignore

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+# Android Studio
+*.iml
+.gradle/
+build/
+local.properties
+.idea/
+
+# Kotlin
+*.class
+*.kotlin_module
+
+# Gradle
+gradlew
+gradlew.bat
+gradle/
+
+# Build directories
+bin/
+out/
+target/
+
+# Logs
+*.log
+
+# System files
+.DS_Store
+Thumbs.db
+
+# Dependencies
+node_modules/
+
+# Sensitive information
+.env

src/main/java/com/wifiscanner/adapter/WifiNetworkAdapter.kt

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+package com.wifiscanner.adapter
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.core.content.ContextCompat
+import androidx.recyclerview.widget.RecyclerView
+import com.wifiscanner.R
+import com.wifiscanner.model.WifiNetwork
+
+/**
+ * RecyclerView adapter for displaying WiFi networks
+ * @property networks List of WiFi networks to display
+ */
+class WifiNetworkAdapter(private val networks: List<WifiNetwork>) : 
+    RecyclerView.Adapter<WifiNetworkAdapter.WifiNetworkViewHolder>() {
+
+    /**
+     * ViewHolder for WiFi network items in the RecyclerView
+     * @param view The view for a single network item
+     */
+    class WifiNetworkViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+        private val ssidTextView: TextView = view.findViewById(R.id.network_ssid)
+        private val strengthTextView: TextView = view.findViewById(R.id.network_strength)
+        private val securityTextView: TextView = view.findViewById(R.id.network_security)
+
+        /**
+         * Bind WiFi network data to the view
+         * @param network The WiFi network to display
+         */
+        fun bind(network: WifiNetwork) {
+            ssidTextView.text = network.ssid
+            strengthTextView.apply {
+                text = "${network.signalStrength} dBm (${network.getSignalQuality()})"
+                setTextColor(ContextCompat.getColor(context, network.getSignalColor()))
+            }
+            securityTextView.text = network.securityType
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): WifiNetworkViewHolder {
+        val view = LayoutInflater.from(parent.context)
+            .inflate(R.layout.wifi_network_item, parent, false)
+        return WifiNetworkViewHolder(view)
+    }
+
+    override fun onBindViewHolder(holder: WifiNetworkViewHolder, position: Int) {
+        holder.bind(networks[position])
+    }
+
+    override fun getItemCount() = networks.size
+}

src/main/java/com/wifiscanner/model/WifiNetwork.kt

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+package com.wifiscanner.model
+
+/**
+ * Data class representing a WiFi network with its key attributes
+ * @property ssid The network's Service Set Identifier (network name)
+ * @property bssid The network's Basic Service Set Identifier (MAC address)
+ * @property signalStrength The signal strength of the WiFi network in dBm
+ * @property securityType The security protocol of the network (e.g., WPA2, Open)
+ * @property frequency The frequency of the WiFi network in MHz
+ */
+data class WifiNetwork(
+    val ssid: String,
+    val bssid: String,
+    val signalStrength: Int,
+    val securityType: String,
+    val frequency: Int
+) {
+    /**
+     * Converts signal strength to a human-readable format
+     * @return A string representation of signal strength quality
+     */
+    fun getSignalQuality(): String = when {
+        signalStrength >= -50 -> "Excellent"
+        signalStrength >= -60 -> "Good"
+        signalStrength >= -70 -> "Fair"
+        else -> "Poor"
+    }
+
+    /**
+     * Provides a color resource based on signal strength
+     * @return Resource ID for signal strength color
+     */
+    fun getSignalColor(): Int = when {
+        signalStrength >= -50 -> android.R.color.holo_green_light
+        signalStrength >= -60 -> android.R.color.holo_green_dark
+        signalStrength >= -70 -> android.R.color.holo_orange_light
+        else -> android.R.color.holo_red_light
+    }
+}

src/main/res/layout/wifi_network_item.xml

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+<?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="wrap_content"
+    android:orientation="vertical"
+    android:padding="16dp"
+    android:background="?attr/selectableItemBackground">
+
+    <TextView
+        android:id="@+id/network_ssid"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="18sp"
+        android:textStyle="bold"
+        android:text="Network Name"/>
+
+    <TextView
+        android:id="@+id/network_strength"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="14sp"
+        android:text="Signal Strength"/>
+
+    <TextView
+        android:id="@+id/network_security"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="14sp"
+        android:text="Security Type"/>
+
+</LinearLayout>

src/test/java/com/wifiscanner/model/WifiNetworkTest.kt

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+package com.wifiscanner.model
+
+import android.R
+import org.junit.Assert.*
+import org.junit.Test
+
+class WifiNetworkTest {
+
+    @Test
+    fun `test signal quality for excellent signal`() {
+        val network = WifiNetwork(
+            ssid = "TestNetwork", 
+            bssid = "00:00:00:00:00", 
+            signalStrength = -40, 
+            securityType = "WPA2", 
+            frequency = 2400
+        )
+        assertEquals("Excellent", network.getSignalQuality())
+        assertEquals(R.color.holo_green_light, network.getSignalColor())
+    }
+
+    @Test
+    fun `test signal quality for good signal`() {
+        val network = WifiNetwork(
+            ssid = "TestNetwork", 
+            bssid = "00:00:00:00:00", 
+            signalStrength = -55, 
+            securityType = "WPA2", 
+            frequency = 2400
+        )
+        assertEquals("Good", network.getSignalQuality())
+        assertEquals(R.color.holo_green_dark, network.getSignalColor())
+    }
+
+    @Test
+    fun `test signal quality for fair signal`() {
+        val network = WifiNetwork(
+            ssid = "TestNetwork", 
+            bssid = "00:00:00:00:00", 
+            signalStrength = -65, 
+            securityType = "WPA2", 
+            frequency = 2400
+        )
+        assertEquals("Fair", network.getSignalQuality())
+        assertEquals(R.color.holo_orange_light, network.getSignalColor())
+    }
+
+    @Test
+    fun `test signal quality for poor signal`() {
+        val network = WifiNetwork(
+            ssid = "TestNetwork", 
+            bssid = "00:00:00:00:00", 
+            signalStrength = -80, 
+            securityType = "WPA2", 
+            frequency = 2400
+        )
+        assertEquals("Poor", network.getSignalQuality())
+        assertEquals(R.color.holo_red_light, network.getSignalColor())
+    }
+}