fix: Close CameraSession if the View is removed (#2174)

* fix: Close `CameraSession` if the View is removed

* fix: Use ViewManager's `onDropViewInstance` instead

* fix: Only stop repeating if we have a session

* fix: Reset `configuration` on `close()`

Author: mrousavy

package/android/src/main/java/com/mrousavy/camera/CameraView.kt

@@ -131,6 +131,10 @@ class CameraView(context: Context) :
     super.onDetachedFromWindow()
   }
 
+  fun destroy() {
+    cameraSession.close()
+  }
+
   fun update() {
     Log.i(TAG, "Updating CameraSession...")
 

package/android/src/main/java/com/mrousavy/camera/CameraViewManager.kt

@@ -31,6 +31,11 @@ class CameraViewManager : ViewGroupManager<CameraView>() {
 
   override fun getName(): String = TAG
 
+  override fun onDropViewInstance(view: CameraView) {
+    view.destroy()
+    super.onDropViewInstance(view)
+  }
+
   @ReactProp(name = "cameraId")
   fun setCameraId(view: CameraView, cameraId: String) {
     view.cameraId = cameraId

package/android/src/main/java/com/mrousavy/camera/core/CameraSession.kt

@@ -172,6 +172,7 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
     codeScannerOutput?.close()
     codeScannerOutput = null
 
+    configuration = null
     isRunning = false
   }
 
@@ -363,16 +364,16 @@ class CameraSession(private val context: Context, private val cameraManager: Cam
   }
 
   private fun configureCaptureRequest(config: CameraConfiguration) {
-    val device = cameraDevice ?: throw NoCameraDeviceError()
-    val captureSession = captureSession ?: throw CameraNotReadyError()
-
     if (!config.isActive) {
       // TODO: Do we want to do stopRepeating() or entirely destroy the session?
       // If the Camera is not active, we don't do anything.
-      captureSession.stopRepeating()
+      captureSession?.stopRepeating()
       return
     }
 
+    val device = cameraDevice ?: throw NoCameraDeviceError()
+    val captureSession = captureSession ?: throw CameraNotReadyError()
+
     val previewOutput = previewOutput
     if (previewOutput == null) {
       Log.w(TAG, "Preview Output is null, aborting...")