Add 4x magnifier (useful for manual focus for closeups)

Author: Dan Oprea

app/src/main/java/com/dan/simplerawcamera/CameraActivity.kt

@@ -871,6 +871,14 @@ class CameraActivity : AppCompatActivity() {
             updateSliders()
         }
 
+        mBinding.switch4X.isChecked = false
+        mBinding.switch4X.setOnCheckedChangeListener { _, isChecked ->
+            giveHapticFeedback(mBinding.switchSequences)
+            val scale = if (isChecked) 4.0f else 1.0f
+            mBinding.surfaceView.scaleX = scale
+            mBinding.surfaceView.scaleY = scale
+        }
+
         mOrientationEventListener = object: OrientationEventListener(this, SensorManager.SENSOR_DELAY_NORMAL) {
             override fun onOrientationChanged(orientation: Int) {
                 val screenOrientation = (orientation + 45) / 90 * 90 //round to 90°

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

@@ -1,6 +1,7 @@
 <?xml version="1.0" encoding="utf-8"?>
 
-<layout xmlns:android="http://schemas.android.com/apk/res/android"
+<layout xmlns:tools="http://schemas.android.com/tools"
+    xmlns:android="http://schemas.android.com/apk/res/android"
     xmlns:app="http://schemas.android.com/apk/res-auto">
 
     <LinearLayout
@@ -259,6 +260,20 @@
                 android:thumbTint="@color/white"
                 android:visibility="invisible" />
 
+            <Switch
+                android:id="@+id/switch4X"
+                android:layout_width="match_parent"
+                android:layout_height="wrap_content"
+                android:layout_gravity="center"
+                android:checked="false"
+                android:gravity="center"
+                android:showText="false"
+                android:text="View 4x"
+                android:textAlignment="center"
+                android:textColor="@color/teal_200"
+                android:textStyle="bold"
+                tools:checked="false" />
+
             <LinearLayout
                 android:layout_width="0dp"
                 android:layout_height="0dp"