Add user-defined button labels with color change on press

- PrefsHelper: PREF_LABEL1, PREF_LABEL2 constants
- SettingsActivity: EditText fields with Done-keyboard action to save labels
- MainActivity: buttons show user label, colorAccent on press, textAllCaps disabled
- activity_main.xml: textAllCaps=false for case-sensitive labels

android/app/src/main/java/com/eddy/atomrelay/MainActivity.kt

@@ -3,6 +3,7 @@ package com.eddy.atomrelay
 
 import android.content.Intent
 import android.content.pm.PackageManager
+import android.content.res.ColorStateList
 import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
@@ -12,6 +13,7 @@ import android.widget.ImageButton
 import android.widget.TextView
 import androidx.appcompat.app.AppCompatActivity
 import androidx.core.app.ActivityCompat
+import androidx.core.content.ContextCompat
 
 class MainActivity : AppCompatActivity(), BleCallbacks {
 
@@ -28,6 +30,8 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
     private lateinit var relay1Button: Button
     private lateinit var relay2Button: Button
     private var lastTheme: String? = null
+    private var originalTint1: ColorStateList? = null
+    private var originalTint2: ColorStateList? = null
 
     override fun onStatusChanged(status: BleStatus) {
         when (status) {
@@ -61,8 +65,8 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
                 relay2Button.setOnTouchListener(null)
                 relay1Button.setOnClickListener(null)
                 relay2Button.setOnClickListener(null)
-                relay1Button.text = getString(R.string.button_retry_scan)
-                relay2Button.text = getString(R.string.button_hold)
+                loadButtonLabel(relay1Button, PrefsHelper.PREF_LABEL1, R.string.button_retry_scan)
+                loadButtonLabel(relay2Button, PrefsHelper.PREF_LABEL2, R.string.button_hold)
                 relay2Button.isEnabled = false
                 relay1Button.isEnabled = true
                 relay1Button.setOnClickListener {
@@ -113,6 +117,8 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
             recreate()
             return
         }
+        loadButtonLabel(relay1Button, PrefsHelper.PREF_LABEL1, R.string.button_hold)
+        loadButtonLabel(relay2Button, PrefsHelper.PREF_LABEL2, R.string.button_hold)
         if (!manager.hasPermissions()) {
             requestPermissions()
             return
@@ -142,17 +148,20 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
 
     private fun setupRelayButton() {
         relay1Button.setOnClickListener(null)
-        relay1Button.text = getString(R.string.button_hold)
+        loadButtonLabel(relay1Button, PrefsHelper.PREF_LABEL1, R.string.button_hold)
+        originalTint1 = relay1Button.backgroundTintList
+
+        val accentColor = ColorStateList.valueOf(ContextCompat.getColor(this, R.color.colorAccent))
         relay1Button.setOnTouchListener { _, event ->
             when (event.action) {
                 MotionEvent.ACTION_DOWN -> {
                     manager.sendRelayCommand(0x01.toByte())
-                    relay1Button.text = getString(R.string.button_on)
+                    relay1Button.backgroundTintList = accentColor
                     true
                 }
                 MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
                     manager.sendRelayCommand(0x00.toByte())
-                    relay1Button.text = getString(R.string.button_hold)
+                    relay1Button.backgroundTintList = originalTint1
                     true
                 }
                 else -> false
@@ -162,17 +171,20 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
 
     private fun setupRelay2Button() {
         relay2Button.setOnClickListener(null)
-        relay2Button.text = getString(R.string.button_hold)
+        loadButtonLabel(relay2Button, PrefsHelper.PREF_LABEL2, R.string.button_hold)
+        originalTint2 = relay2Button.backgroundTintList
+
+        val accentColor = ColorStateList.valueOf(ContextCompat.getColor(this, R.color.colorAccent))
         relay2Button.setOnTouchListener { _, event ->
             when (event.action) {
                 MotionEvent.ACTION_DOWN -> {
                     manager.sendRelayCommand(0x02.toByte())
-                    relay2Button.text = getString(R.string.button_on)
+                    relay2Button.backgroundTintList = accentColor
                     true
                 }
                 MotionEvent.ACTION_UP, MotionEvent.ACTION_CANCEL -> {
                     manager.sendRelayCommand(0x03.toByte())
-                    relay2Button.text = getString(R.string.button_hold)
+                    relay2Button.backgroundTintList = originalTint2
                     true
                 }
                 else -> false
@@ -180,6 +192,12 @@ class MainActivity : AppCompatActivity(), BleCallbacks {
         }
     }
 
+    private fun loadButtonLabel(button: Button, prefKey: String, fallbackResId: Int) {
+        val prefs = PrefsHelper.getPrefs(this)
+        val label = prefs.getString(prefKey, "")?.trim()
+        button.text = if (label.isNullOrEmpty()) getString(fallbackResId) else label
+    }
+
     private fun requestPermissions() {
         val perms = manager.getRequiredPermissions()
         ActivityCompat.requestPermissions(this, perms, 1)

android/app/src/main/java/com/eddy/atomrelay/PrefsHelper.kt

@@ -13,6 +13,8 @@ object PrefsHelper {
     const val PREF_UUID = "device_uuid"
     const val PREF_SEQ = "seq_counter"
     const val PREF_THEME = "theme"
+    const val PREF_LABEL1 = "label_relay1"
+    const val PREF_LABEL2 = "label_relay2"
     const val SEQ_MAX = 1_000_000
 
     fun applyTheme(context: Context) {

android/app/src/main/java/com/eddy/atomrelay/SettingsActivity.kt

@@ -17,8 +17,11 @@ import android.os.Bundle
 import android.os.Handler
 import android.os.Looper
 import android.util.Log
+import android.view.inputmethod.EditorInfo
+import android.view.inputmethod.InputMethodManager
 import android.widget.Button
 import android.widget.CheckBox
+import android.widget.EditText
 import android.widget.ProgressBar
 import android.widget.RadioGroup
 import android.widget.TextView
@@ -136,6 +139,7 @@ class SettingsActivity : AppCompatActivity() {
         registerReceiver(usbDetachedReceiver, IntentFilter(UsbManager.ACTION_USB_DEVICE_DETACHED), Context.RECEIVER_EXPORTED)
 
         setupThemeButtons()
+        setupLabelEditTexts()
     }
 
     override fun onResume() {
@@ -200,6 +204,33 @@ class SettingsActivity : AppCompatActivity() {
         return true
     }
 
+    private fun setupLabelEditTexts() {
+        val prefs = PrefsHelper.getPrefs(this)
+        val label1 = findViewById<EditText>(R.id.labelRelay1)
+        val label2 = findViewById<EditText>(R.id.labelRelay2)
+        val imm = getSystemService(Context.INPUT_METHOD_SERVICE) as InputMethodManager
+
+        label1.setText(prefs.getString(PrefsHelper.PREF_LABEL1, ""))
+        label2.setText(prefs.getString(PrefsHelper.PREF_LABEL2, ""))
+
+        label1.setOnEditorActionListener { _, actionId, _ ->
+            if (actionId == EditorInfo.IME_ACTION_DONE) {
+                prefs.edit().putString(PrefsHelper.PREF_LABEL1, label1.text.toString().trim()).apply()
+                imm.hideSoftInputFromWindow(label1.windowToken, 0)
+                label1.clearFocus()
+            }
+            false
+        }
+        label2.setOnEditorActionListener { _, actionId, _ ->
+            if (actionId == EditorInfo.IME_ACTION_DONE) {
+                prefs.edit().putString(PrefsHelper.PREF_LABEL2, label2.text.toString().trim()).apply()
+                imm.hideSoftInputFromWindow(label2.windowToken, 0)
+                label2.clearFocus()
+            }
+            false
+        }
+    }
+
     // === Key Exchange ===
 
     private fun startKeyExchange() {

android/app/src/main/res/layout/activity_main.xml

@@ -26,6 +26,7 @@
             android:layout_height="200dp"
             android:text="1"
             android:textSize="24sp"
+            android:textAllCaps="false"
             android:enabled="false" />
 
         <Button
@@ -35,6 +36,7 @@
             android:layout_marginStart="16dp"
             android:text="2"
             android:textSize="24sp"
+            android:textAllCaps="false"
             android:enabled="false" />
 
     </LinearLayout>

android/app/src/main/res/layout/activity_settings.xml

@@ -45,6 +45,49 @@
         android:layout_marginTop="24dp"
         android:layout_marginBottom="16dp" />
 
+    <TextView
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:text="@string/section_labels"
+        android:textSize="14sp"
+        android:textStyle="bold"
+        android:layout_marginBottom="8dp" />
+
+    <LinearLayout
+        android:layout_width="match_parent"
+        android:layout_height="wrap_content"
+        android:orientation="horizontal"
+        android:layout_marginBottom="16dp">
+
+        <EditText
+            android:id="@+id/labelRelay1"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:hint="@string/hint_label_relay1"
+            android:maxLines="1"
+            android:inputType="text"
+            android:imeOptions="actionDone"
+            android:gravity="center" />
+
+        <EditText
+            android:id="@+id/labelRelay2"
+            android:layout_width="0dp"
+            android:layout_height="wrap_content"
+            android:layout_weight="1"
+            android:hint="@string/hint_label_relay2"
+            android:maxLines="1"
+            android:inputType="text"
+            android:imeOptions="actionDone"
+            android:gravity="center" />
+    </LinearLayout>
+
+    <View
+        android:layout_width="match_parent"
+        android:layout_height="1dp"
+        android:background="?android:attr/listDivider"
+        android:layout_marginBottom="16dp" />
+
     <TextView
         android:layout_width="match_parent"
         android:layout_height="wrap_content"

android/app/src/main/res/values/strings.xml

@@ -55,6 +55,11 @@
     <string name="button_close">Sluiten</string>
     <string name="button_cancel">Annuleren</string>
 
+    <!-- Label customization -->
+    <string name="section_labels">Knoptekst</string>
+    <string name="hint_label_relay1">Relay 1</string>
+    <string name="hint_label_relay2">Relay 2</string>
+
     <!-- Theme -->
     <string name="section_theme">Weergave</string>
     <string name="theme_system">Systeem</string>