Fix camera issues.

android/src/main/java/org/reactnative/camera/CameraViewManager.java

@@ -20,6 +20,7 @@ public class CameraViewManager extends ViewGroupManager<RNCameraView> {
     EVENT_ON_FACES_DETECTED("onFacesDetected"),
     EVENT_ON_BARCODES_DETECTED("onGoogleVisionBarcodesDetected"),
     EVENT_ON_FACE_DETECTION_ERROR("onFaceDetectionError"),
+    EVENT_ON_BARCODE_DETECTION_ERROR("onGoogleVisionBarcodeDetectionError"),
     EVENT_ON_TEXT_RECOGNIZED("onTextRecognized");
 
     private final String mName;

android/src/main/java/org/reactnative/camera/RNCameraView.java

@@ -20,10 +20,10 @@ import com.google.zxing.BarcodeFormat;
 import com.google.zxing.DecodeHintType;
 import com.google.zxing.MultiFormatReader;
 import com.google.zxing.Result;
+import org.reactnative.barcodedetector.RNBarcodeDetector;
 import org.reactnative.camera.tasks.*;
 import org.reactnative.camera.utils.ImageDimensions;
 import org.reactnative.camera.utils.RNFileUtils;
-import org.reactnative.barcodedetector.RNBarcodeDetector;
 import org.reactnative.facedetector.RNFaceDetector;
 
 import java.io.File;
@@ -84,7 +84,7 @@ public class RNCameraView extends CameraView implements LifecycleEventListener,
 
       @Override
       public void onMountError(CameraView cameraView) {
-        RNCameraViewHelper.emitMountErrorEvent(cameraView);
+        RNCameraViewHelper.emitMountErrorEvent(cameraView, "Camera view threw an error - component could not be rendered.");
       }
 
       @Override
@@ -414,9 +414,7 @@ public class RNCameraView extends CameraView implements LifecycleEventListener,
         }
       }
     } else {
-      WritableMap error = Arguments.createMap();
-      error.putString("message", "Camera permissions not granted - component could not be rendered.");
-      RNCameraViewHelper.emitMountErrorEvent(this);
+      RNCameraViewHelper.emitMountErrorEvent(this, "Camera permissions not granted - component could not be rendered.");
     }
   }
 
@@ -433,6 +431,7 @@ public class RNCameraView extends CameraView implements LifecycleEventListener,
     mFaceDetector.release();
     mBarcodeDetector.release();
     stop();
+    mThemedReactContext.removeLifecycleEventListener(this);
   }
 
   private boolean hasCameraPermissions() {

android/src/main/java/org/reactnative/camera/RNCameraViewHelper.java

@@ -161,8 +161,8 @@ public class RNCameraViewHelper {
   };
   // Mount error event
 
-  public static void emitMountErrorEvent(ViewGroup view) {
-    CameraMountErrorEvent event = CameraMountErrorEvent.obtain(view.getId());
+  public static void emitMountErrorEvent(ViewGroup view, String error) {
+    CameraMountErrorEvent event = CameraMountErrorEvent.obtain(view.getId(), error);
     ReactContext reactContext = (ReactContext) view.getContext();
     reactContext.getNativeModule(UIManagerModule.class).getEventDispatcher().dispatchEvent(event);
   }

android/src/main/java/org/reactnative/camera/events/BarcodeDetectionErrorEvent.java

@@ -37,7 +37,7 @@ public class BarcodeDetectionErrorEvent extends Event<BarcodeDetectionErrorEvent
 
   @Override
   public String getEventName() {
-    return CameraViewManager.Events.EVENT_ON_MOUNT_ERROR.toString();
+    return CameraViewManager.Events.EVENT_ON_BARCODE_DETECTION_ERROR.toString();
   }
 
   @Override

android/src/main/java/org/reactnative/camera/events/CameraMountErrorEvent.java

@@ -1,28 +1,33 @@
 package org.reactnative.camera.events;
 
 import android.support.v4.util.Pools;
-
-import org.reactnative.camera.CameraViewManager;
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.uimanager.events.Event;
 import com.facebook.react.uimanager.events.RCTEventEmitter;
-
-import java.util.Date;
+import org.reactnative.camera.CameraViewManager;
 
 public class CameraMountErrorEvent extends Event<CameraMountErrorEvent> {
   private static final Pools.SynchronizedPool<CameraMountErrorEvent> EVENTS_POOL = new Pools.SynchronizedPool<>(3);
-  private CameraMountErrorEvent() {}
+  private String mError;
 
-  public static CameraMountErrorEvent obtain(int viewTag) {
+  private CameraMountErrorEvent() {
+  }
+
+  public static CameraMountErrorEvent obtain(int viewTag, String error) {
     CameraMountErrorEvent event = EVENTS_POOL.acquire();
     if (event == null) {
       event = new CameraMountErrorEvent();
     }
-    event.init(viewTag);
+    event.init(viewTag, error);
     return event;
   }
 
+  private void init(int viewTag, String error) {
+    super.init(viewTag);
+    mError = error;
+  }
+
   @Override
   public short getCoalescingKey() {
     return 0;
@@ -39,6 +44,8 @@ public class CameraMountErrorEvent extends Event<CameraMountErrorEvent> {
   }
 
   private WritableMap serializeEventData() {
-    return Arguments.createMap();
+    WritableMap arguments = Arguments.createMap();
+    arguments.putString("message", mError);
+    return arguments;
   }
 }