handle multiple error listeners

README.md

@@ -220,8 +220,9 @@ camera.addCameraListener(new CameraListener() {
     /**
      * Notifies that an error occurred in any of the previously called methods.
      * The default implementation will just throw the original exception again to prevent missing
-     * error handling. Override this method without calling the super method in order to implement
-     * custom error handling.
+     * error handling. As soon as this method was overridden at least once (without calling the
+     * super method or re-throwing the exception), the default behavior will be disabled. So pay
+     * attention to not swallowing any exceptions.
      */
     @Override 
     public void onError(CameraException exception) {

cameraview/src/main/java/com/otaliastudios/cameraview/CameraException.java

@@ -5,7 +5,7 @@ package com.otaliastudios.cameraview;
  */
 public class CameraException extends RuntimeException {
 
-    public CameraException(String message, Throwable cause) {
+    CameraException(String message, Throwable cause) {
         super(message, cause);
     }
 }

cameraview/src/main/java/com/otaliastudios/cameraview/CameraView.java

@@ -1571,8 +1571,19 @@ public class CameraView extends FrameLayout {
             mUiHandler.post(new Runnable() {
                 @Override
                 public void run() {
+
+                    // all error listeners will be called, but at most one of them should actually
+                    // throw the exception
+                    int count = 0;
                     for (CameraListener listener : mListeners) {
+                        try {
                             listener.onError(exception);
+                        } catch (CameraException ce) {
+                            count++;
+                        }
+                    }
+                    if (count == mListeners.size()) {
+                        throw exception;
                     }
                 }
             });