removing a redundant function

app/src/main/kotlin/com/simplemobiletools/camera/activities/MainActivity.kt

@@ -97,7 +97,6 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
         mFadeHandler.removeCallbacksAndMessages(null)
 
         hideTimer()
-        mPreview?.releaseCamera()
         mOrientationEventListener.disable()
 
         if (mPreview?.getCameraState() == STATE_PICTURE_TAKEN) {
@@ -108,7 +107,6 @@ class MainActivity : SimpleActivity(), PreviewListener, PhotoProcessor.MediaSave
 
     override fun onDestroy() {
         super.onDestroy()
-        mPreview?.releaseCamera()
         mPreview = null
     }
 

app/src/main/kotlin/com/simplemobiletools/camera/interfaces/MyPreview.kt

@@ -17,8 +17,6 @@ interface MyPreview {
 
     fun getCameraState(): Int
 
-    fun releaseCamera()
-
     fun showChangeResolutionDialog()
 
     fun toggleFrontBackCamera()

app/src/main/kotlin/com/simplemobiletools/camera/views/PreviewCameraOne.kt

@@ -115,7 +115,9 @@ class PreviewCameraOne : ViewGroup, SurfaceHolder.Callback, MyPreview {
 
     override fun onResumed() {}
 
-    override fun onPaused() {}
+    override fun onPaused() {
+        releaseCamera()
+    }
 
     override fun tryInitVideoMode() {
         if (mIsSurfaceCreated) {
@@ -502,7 +504,7 @@ class PreviewCameraOne : ViewGroup, SurfaceHolder.Callback, MyPreview {
         }
     }
 
-    override fun releaseCamera() {
+    fun releaseCamera() {
         stopRecording()
         mCamera?.stopPreview()
         mCamera?.release()

app/src/main/kotlin/com/simplemobiletools/camera/views/PreviewCameraTwo.kt

@@ -403,9 +403,6 @@ class PreviewCameraTwo : ViewGroup, TextureView.SurfaceTextureListener, MyPrevie
 
     override fun getCameraState() = mCameraState
 
-    override fun releaseCamera() {
-    }
-
     override fun showChangeResolutionDialog() {
     }