Add fullscreen QR code viewer for easier scanning

- Create QRCodeFullscreenActivity for large QR code display
- Add click listener to QR code image in PolycentricBackupActivity
- Add visual feedback with ripple effect and hint text
- Add localized strings for fullscreen hint
- Update layout to include hint text below QR code
- Add activity to AndroidManifest.xml

This makes it much easier to scan QR codes by providing
a fullscreen view when tapping the QR code image.

app/src/main/AndroidManifest.xml

@@ -242,5 +242,9 @@
             android:name=".activities.PolycentricModerationActivity"
             android:exported="false"
             android:screenOrientation="portrait" />
+        <activity
+            android:name=".activities.QRCodeFullscreenActivity"
+            android:screenOrientation="sensorPortrait"
+            android:theme="@style/Theme.FutoVideo.NoActionBar" />
     </application>
 </manifest>

app/src/main/java/com/futo/platformplayer/activities/PolycentricBackupActivity.kt

@@ -22,6 +22,7 @@ import com.futo.platformplayer.states.StateApp
 import com.futo.platformplayer.states.StateApp.Companion.withContext
 import com.futo.platformplayer.states.StatePolycentric
 import com.futo.platformplayer.views.buttons.BigButton
+import com.futo.platformplayer.activities.QRCodeFullscreenActivity
 import com.futo.polycentric.core.ContentType
 import com.futo.polycentric.core.SignedEvent
 import com.futo.polycentric.core.StorageTypeCRDTItem
@@ -49,6 +50,7 @@ class PolycentricBackupActivity : AppCompatActivity() {
     private lateinit var _imageQR: ImageView;
     private lateinit var _exportBundle: String;
     private lateinit var _textQR: TextView;
+    private lateinit var _textQRHint: TextView;
     private lateinit var _loader: View
 
     override fun attachBaseContext(newBase: Context?) {
@@ -64,6 +66,7 @@ class PolycentricBackupActivity : AppCompatActivity() {
         _buttonCopy = findViewById(R.id.button_copy)
         _imageQR = findViewById(R.id.image_qr)
         _textQR = findViewById(R.id.text_qr)
+        _textQRHint = findViewById(R.id.text_qr_hint)
         _loader = findViewById(R.id.progress_loader)
         findViewById<ImageButton>(R.id.button_back).setOnClickListener {
             finish();
@@ -71,6 +74,7 @@ class PolycentricBackupActivity : AppCompatActivity() {
 
         _imageQR.visibility = View.INVISIBLE
         _textQR.visibility = View.INVISIBLE
+        _textQRHint.visibility = View.INVISIBLE
         _loader.visibility = View.VISIBLE
         _buttonShare.visibility = View.INVISIBLE
         _buttonCopy.visibility = View.INVISIBLE
@@ -92,8 +96,15 @@ class PolycentricBackupActivity : AppCompatActivity() {
                 _imageQR.setImageBitmap(pair.second)
                 _imageQR.visibility = View.VISIBLE
                 _textQR.visibility = View.VISIBLE
+                _textQRHint.visibility = View.VISIBLE
                 _buttonShare.visibility = View.VISIBLE
                 _buttonCopy.visibility = View.VISIBLE
+                
+                // Add click listener to open QR code in fullscreen
+                _imageQR.setOnClickListener {
+                    val intent = QRCodeFullscreenActivity.createIntent(this@PolycentricBackupActivity, pair.second, _exportBundle)
+                    startActivity(intent)
+                }
             } catch (e: Exception) {
                 Logger.e(TAG, getString(R.string.failed_to_generate_qr_code), e)
                 
@@ -107,6 +118,7 @@ class PolycentricBackupActivity : AppCompatActivity() {
                 }
                 _textQR.text = errorMessage
                 _textQR.visibility = View.VISIBLE
+                _textQRHint.visibility = View.INVISIBLE
                 _buttonShare.visibility = View.VISIBLE
                 _buttonCopy.visibility = View.VISIBLE
                 

app/src/main/java/com/futo/platformplayer/activities/QRCodeFullscreenActivity.kt

@@ -0,0 +1,62 @@
+package com.futo.platformplayer.activities
+
+import android.content.Context
+import android.graphics.Bitmap
+import android.os.Bundle
+import android.view.View
+import android.widget.ImageButton
+import android.widget.ImageView
+import androidx.appcompat.app.AppCompatActivity
+import com.futo.platformplayer.R
+import com.futo.platformplayer.setNavigationBarColorAndIcons
+import com.futo.platformplayer.states.StateApp
+
+class QRCodeFullscreenActivity : AppCompatActivity() {
+    companion object {
+        private const val EXTRA_QR_BITMAP = "qr_bitmap"
+        private const val EXTRA_QR_TEXT = "qr_text"
+        
+        fun createIntent(context: Context, qrBitmap: Bitmap, qrText: String): android.content.Intent {
+            return android.content.Intent(context, QRCodeFullscreenActivity::class.java).apply {
+                putExtra(EXTRA_QR_BITMAP, qrBitmap)
+                putExtra(EXTRA_QR_TEXT, qrText)
+            }
+        }
+    }
+
+    override fun attachBaseContext(newBase: Context?) {
+        super.attachBaseContext(StateApp.instance.getLocaleContext(newBase))
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_qr_code_fullscreen)
+        setNavigationBarColorAndIcons()
+
+        val qrBitmap = intent.getParcelableExtra<Bitmap>(EXTRA_QR_BITMAP)
+        val qrText = intent.getStringExtra(EXTRA_QR_TEXT)
+
+        val imageQR = findViewById<ImageView>(R.id.image_qr_fullscreen)
+        val buttonBack = findViewById<ImageButton>(R.id.button_back_fullscreen)
+        val buttonClose = findViewById<ImageButton>(R.id.button_close_fullscreen)
+
+        // Set the QR code image
+        qrBitmap?.let { bitmap ->
+            imageQR.setImageBitmap(bitmap)
+        }
+
+        // Set click listeners
+        buttonBack.setOnClickListener {
+            finish()
+        }
+
+        buttonClose.setOnClickListener {
+            finish()
+        }
+
+        // Make the entire QR code area clickable to close
+        imageQR.setOnClickListener {
+            finish()
+        }
+    }
+}

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

@@ -29,6 +29,8 @@
         android:id="@+id/image_qr"
         android:layout_width="200dp"
         android:layout_height="200dp"
+        android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:padding="8dp"
         app:srcCompat="@drawable/ic_qr"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent"
@@ -47,6 +49,19 @@
         app:layout_constraintLeft_toLeftOf="@id/image_qr"
         app:layout_constraintRight_toRightOf="@id/image_qr" />
 
+    <TextView
+        android:id="@+id/text_qr_hint"
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="@string/tap_qr_code_for_fullscreen"
+        android:fontFamily="@font/inter_light"
+        android:textSize="14dp"
+        android:textColor="@color/gray_400"
+        android:layout_marginTop="8dp"
+        app:layout_constraintTop_toBottomOf="@id/text_qr"
+        app:layout_constraintLeft_toLeftOf="@id/text_qr"
+        app:layout_constraintRight_toRightOf="@id/text_qr" />
+
     <LinearLayout
         android:id="@+id/layout_buttons"
         android:layout_width="match_parent"
@@ -55,7 +70,7 @@
         android:layout_marginStart="20dp"
         android:layout_marginEnd="20dp"
         android:layout_marginTop="30dp"
-        app:layout_constraintTop_toBottomOf="@id/text_qr"
+        app:layout_constraintTop_toBottomOf="@id/text_qr_hint"
         app:layout_constraintLeft_toLeftOf="parent"
         app:layout_constraintRight_toRightOf="parent">
 

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

@@ -0,0 +1,54 @@
+<?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"
+    android:background="@color/black">
+
+    <!-- Top navigation bar -->
+    <ImageButton
+        android:id="@+id/button_back_fullscreen"
+        android:layout_width="50dp"
+        android:layout_height="50dp"
+        android:contentDescription="@string/cd_button_back"
+        android:padding="10dp"
+        android:scaleType="fitCenter"
+        android:background="?android:attr/selectableItemBackgroundBorderless"
+        app:srcCompat="@drawable/ic_back_thin_white_16dp"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        android:layout_marginTop="16dp"
+        android:layout_marginStart="16dp" />
+
+    <ImageButton
+        android:id="@+id/button_close_fullscreen"
+        android:layout_width="50dp"
+        android:layout_height="50dp"
+        android:contentDescription="@string/cd_button_close"
+        android:padding="10dp"
+        android:scaleType="fitCenter"
+        android:background="?android:attr/selectableItemBackgroundBorderless"
+        app:srcCompat="@drawable/ic_close"
+        app:layout_constraintTop_toTopOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        android:layout_marginTop="16dp"
+        android:layout_marginEnd="16dp" />
+
+    <!-- Full screen QR code -->
+    <ImageView
+        android:id="@+id/image_qr_fullscreen"
+        android:layout_width="0dp"
+        android:layout_height="0dp"
+        android:scaleType="fitCenter"
+        android:background="?android:attr/selectableItemBackgroundBorderless"
+        android:padding="40dp"
+        app:layout_constraintTop_toBottomOf="@id/button_back_fullscreen"
+        app:layout_constraintBottom_toBottomOf="parent"
+        app:layout_constraintLeft_toLeftOf="parent"
+        app:layout_constraintRight_toRightOf="parent"
+        android:layout_marginTop="20dp"
+        android:layout_marginBottom="20dp"
+        android:layout_marginStart="20dp"
+        android:layout_marginEnd="20dp" />
+
+</androidx.constraintlayout.widget.ConstraintLayout>

app/src/main/res/values-de/strings.xml

@@ -405,6 +405,7 @@
     <string name="failed_to_parse_newpipe_subscriptions">Fehler beim Parsen von NewPipe-Abonnements</string>
     <string name="failed_to_generate_qr_code">Fehler beim Generieren des QR-Codes</string>
     <string name="qr_code_too_large_use_text_below">QR-Code zu groß. Verwenden Sie den Text unten, um Ihr Profil zu teilen.</string>
+    <string name="tap_qr_code_for_fullscreen">Tippen Sie auf den QR-Code für Vollbildansicht</string>
     <string name="share_text">Text teilen</string>
     <string name="copied_text">Text kopiert</string>
     <string name="must_be_at_least_3_characters_long">Muss mindestens 3 Zeichen lang sein.</string>

app/src/main/res/values-es/strings.xml

@@ -382,6 +382,7 @@
     <string name="failed_to_parse_newpipe_subscriptions">Error al analizar las suscripciones de NewPipe</string>
     <string name="failed_to_generate_qr_code">Error al generar el código QR</string>
     <string name="qr_code_too_large_use_text_below">Código QR demasiado grande. Use el texto de abajo para compartir su perfil.</string>
+    <string name="tap_qr_code_for_fullscreen">Toca el código QR para vista completa</string>
     <string name="share_text">Compartir texto</string>
     <string name="copied_text">Texto copiado</string>
     <string name="must_be_at_least_3_characters_long">Debe tener al menos 3 caracteres de longitud.</string>

app/src/main/res/values-fr/strings.xml

@@ -421,6 +421,7 @@
     <string name="failed_to_parse_newpipe_subscriptions">Échec de l\'analyse des abonnements NewPipe</string>
     <string name="failed_to_generate_qr_code">Échec de la génération du code QR</string>
     <string name="qr_code_too_large_use_text_below">Code QR trop volumineux. Utilisez le texte ci-dessous pour partager votre profil.</string>
+    <string name="tap_qr_code_for_fullscreen">Appuyez sur le code QR pour la vue plein écran</string>
     <string name="share_text">Partager le texte</string>
     <string name="copied_text">Texte copié</string>
     <string name="must_be_at_least_3_characters_long">Doit comporter au moins 3 caractères.</string>

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

@@ -643,6 +643,7 @@
     <string name="failed_to_parse_newpipe_subscriptions">Failed to parse NewPipe Subscriptions</string>
     <string name="failed_to_generate_qr_code">Failed to generate QR code</string>
     <string name="qr_code_too_large_use_text_below">QR code too large. Use the text below to share your profile.</string>
+    <string name="tap_qr_code_for_fullscreen">Tap QR code for fullscreen view</string>
     <string name="share_text">Share Text</string>
     <string name="copied_text">Copied Text</string>
     <string name="must_be_at_least_3_characters_long">Must be at least 3 characters long.</string>