Notify exception from the callback instead of crashing the app. Fixes #164, #165

Author: Diolor

README.md

@@ -166,7 +166,7 @@ repositories {
   maven { url 'https://jitpack.io' }
 }
  
-compile 'io.fotoapparat.fotoapparat:library:2.0.1'
+compile 'io.fotoapparat.fotoapparat:library:2.0.2'
 ```
 
 Camera permission will be automatically added to your `AndroidManifest.xml`. Do not forget to request this permission on Marshmallow and higher.

fotoapparat/src/main/java/io/fotoapparat/exception/camera/UnavailableSurfaceException.kt

@@ -0,0 +1,9 @@
+package io.fotoapparat.exception.camera
+
+/**
+ * Thrown when the preview surface didn't become available.
+ */
+class UnavailableSurfaceException : CameraException(
+        "No preview surface became available before CameraView got detached from window. " +
+                "Camera didn't start. You may ignore this exception."
+)

fotoapparat/src/main/java/io/fotoapparat/view/CameraView.kt

@@ -6,6 +6,7 @@ import android.util.AttributeSet
 import android.view.TextureView
 import android.view.ViewGroup
 import android.widget.FrameLayout
+import io.fotoapparat.exception.camera.UnavailableSurfaceException
 import io.fotoapparat.parameter.Resolution
 import io.fotoapparat.parameter.ScaleType
 import java.util.concurrent.CountDownLatch
@@ -63,7 +64,7 @@ class CameraView
 
     private fun getPreviewAfterLatch(): Preview.Texture {
         textureLatch.await()
-        return surfaceTexture?.toPreview() ?: throw InterruptedException("No surface became available.")
+        return surfaceTexture?.toPreview() ?: throw UnavailableSurfaceException()
     }
 
     private fun TextureView.tryInitialize() = surfaceTexture ?: null.also {
@@ -75,7 +76,6 @@ class CameraView
 
 }
 
-
 private fun ViewGroup.layoutTextureView(
         previewResolution: Resolution?,
         scaleType: ScaleType?