Implement WiFi Network List UI with RecyclerView

.gitignore

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+# Android Studio
+*.iml
+.gradle
+/local.properties
+/.idea/
+.DS_Store
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+/captures
+.externalNativeBuild
+.cxx
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+# Gradle
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+*.class
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app/src/main/java/com/wifiscanner/model/WifiNetwork.kt

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+package com.wifiscanner.model
+
+/**
+ * Data class representing a WiFi network with its details
+ *
+ * @property ssid The name of the WiFi network
+ * @property bssid The MAC address of the WiFi access point
+ * @property signalStrength The signal strength of the WiFi network in dBm
+ * @property securityType The security type of the WiFi network
+ * @property frequency The frequency of the WiFi network in MHz
+ */
+data class WifiNetwork(
+    val ssid: String,
+    val bssid: String,
+    val signalStrength: Int,
+    val securityType: SecurityType,
+    val frequency: Int
+) {
+    /**
+     * Enum representing WiFi network security types
+     */
+    enum class SecurityType {
+        OPEN,
+        WEP,
+        WPA,
+        WPA2,
+        WPA3,
+        UNKNOWN
+    }
+
+    /**
+     * Calculate a human-readable signal strength description
+     *
+     * @return A string describing the signal strength
+     */
+    fun getSignalStrengthDescription(): String {
+        return when {
+            signalStrength >= -50 -> "Excellent"
+            signalStrength >= -60 -> "Good"
+            signalStrength >= -70 -> "Fair"
+            else -> "Weak"
+        }
+    }
+}

app/src/main/java/com/wifiscanner/ui/WifiNetworkAdapter.kt

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+package com.wifiscanner.ui
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+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
+     *
+     * @param itemView The view for a single WiFi network item
+     */
+    class WifiNetworkViewHolder(itemView: View) : RecyclerView.ViewHolder(itemView) {
+        private val ssidTextView: TextView = itemView.findViewById(R.id.wifi_ssid)
+        private val signalStrengthTextView: TextView = itemView.findViewById(R.id.wifi_signal_strength)
+        private val securityTypeTextView: TextView = itemView.findViewById(R.id.wifi_security_type)
+
+        /**
+         * Bind WiFi network data to the view
+         *
+         * @param network The WiFi network to display
+         */
+        fun bind(network: WifiNetwork) {
+            ssidTextView.text = network.ssid
+            signalStrengthTextView.text = network.getSignalStrengthDescription()
+            securityTypeTextView.text = network.securityType.name
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): WifiNetworkViewHolder {
+        val itemView = LayoutInflater.from(parent.context)
+            .inflate(R.layout.wifi_network_item, parent, false)
+        return WifiNetworkViewHolder(itemView)
+    }
+
+    override fun onBindViewHolder(holder: WifiNetworkViewHolder, position: Int) {
+        holder.bind(networks[position])
+    }
+
+    override fun getItemCount() = networks.size
+}

app/src/main/java/com/wifiscanner/ui/WifiNetworkListActivity.kt

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+package com.wifiscanner.ui
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+import androidx.recyclerview.widget.LinearLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.wifiscanner.R
+import com.wifiscanner.model.WifiNetwork
+
+/**
+ * Activity to display the list of WiFi networks
+ */
+class WifiNetworkListActivity : AppCompatActivity() {
+
+    private lateinit var wifiNetworkRecyclerView: RecyclerView
+    private lateinit var wifiNetworkAdapter: WifiNetworkAdapter
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_wifi_network_list)
+
+        // Initialize RecyclerView
+        wifiNetworkRecyclerView = findViewById(R.id.wifi_network_recycler_view)
+        wifiNetworkRecyclerView.layoutManager = LinearLayoutManager(this)
+
+        // Sample data for initial setup (replace with actual WiFi scanning logic)
+        val sampleNetworks = listOf(
+            WifiNetwork("Home WiFi", "00:11:22:33:44:55", -55, WifiNetwork.SecurityType.WPA2, 2400),
+            WifiNetwork("Office Network", "AA:BB:CC:DD:EE:FF", -65, WifiNetwork.SecurityType.WPA3, 5000),
+            WifiNetwork("Public WiFi", "11:22:33:44:55:66", -75, WifiNetwork.SecurityType.OPEN, 2400)
+        )
+
+        // Set up adapter
+        wifiNetworkAdapter = WifiNetworkAdapter(sampleNetworks)
+        wifiNetworkRecyclerView.adapter = wifiNetworkAdapter
+    }
+}

app/src/main/res/layout/activity_wifi_network_list.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<androidx.constraintlayout.widget.ConstraintLayout 
+    xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto"
+    android:layout_width="match_parent"
+    android:layout_height="match_parent">
+
+    <androidx.recyclerview.widget.RecyclerView
+        android:id="@+id/wifi_network_recycler_view"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintEnd_toEndOf="parent"
+        app:layout_constraintStart_toStartOf="parent"
+        app:layout_constraintTop_toTopOf="parent" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/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"
+    xmlns:tools="http://schemas.android.com/tools"
+    android:layout_width="match_parent"
+    android:layout_height="wrap_content"
+    android:orientation="vertical"
+    android:padding="16dp">
+
+    <TextView
+        android:id="@+id/wifi_ssid"
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:textSize="18sp"
+        android:textStyle="bold"
+        tools:text="Network Name" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:layout_marginTop="8dp">
+
+        <TextView
+            android:id="@+id/wifi_signal_strength"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            tools:text="Good Signal" />
+
+        <TextView
+            android:id="@+id/wifi_security_type"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:gravity="end"
+            tools:text="WPA2" />
+    </LinearLayout>
+</LinearLayout>

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

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+package com.wifiscanner.model
+
+import org.junit.Assert.*
+import org.junit.Test
+
+class WifiNetworkTest {
+
+    @Test
+    fun `test wifi network signal strength description`() {
+        val excellentSignal = WifiNetwork(
+            "Test Network", 
+            "00:11:22:33:44:55", 
+            -45, 
+            WifiNetwork.SecurityType.WPA2, 
+            2400
+        )
+        assertEquals("Excellent", excellentSignal.getSignalStrengthDescription())
+
+        val goodSignal = WifiNetwork(
+            "Test Network", 
+            "00:11:22:33:44:55", 
+            -55, 
+            WifiNetwork.SecurityType.WPA2, 
+            2400
+        )
+        assertEquals("Good", goodSignal.getSignalStrengthDescription())
+
+        val fairSignal = WifiNetwork(
+            "Test Network", 
+            "00:11:22:33:44:55", 
+            -65, 
+            WifiNetwork.SecurityType.WPA2, 
+            2400
+        )
+        assertEquals("Fair", fairSignal.getSignalStrengthDescription())
+
+        val weakSignal = WifiNetwork(
+            "Test Network", 
+            "00:11:22:33:44:55", 
+            -80, 
+            WifiNetwork.SecurityType.WPA2, 
+            2400
+        )
+        assertEquals("Weak", weakSignal.getSignalStrengthDescription())
+    }
+
+    @Test
+    fun `test wifi network data class properties`() {
+        val network = WifiNetwork(
+            "Home WiFi", 
+            "00:11:22:33:44:55", 
+            -55, 
+            WifiNetwork.SecurityType.WPA2, 
+            2400
+        )
+
+        assertEquals("Home WiFi", network.ssid)
+        assertEquals("00:11:22:33:44:55", network.bssid)
+        assertEquals(-55, network.signalStrength)
+        assertEquals(WifiNetwork.SecurityType.WPA2, network.securityType)
+        assertEquals(2400, network.frequency)
+    }
+}