Wrapped some crashes which happened on start camera and which connect with params. (#897)

Co-authored-by: Mattia Iavarone <mat.iavarone@gmail.com>

cameraview/src/main/java/com/otaliastudios/cameraview/engine/Camera1Engine.java

@@ -165,6 +165,10 @@ public class Camera1Engine extends CameraBaseEngine implements
             LOG.e("onStartEngine:", "Failed to connect. Maybe in use by another app?");
             throw new CameraException(e, CameraException.REASON_FAILED_TO_CONNECT);
         }
+        if (mCamera == null) {
+            LOG.e("onStartEngine:", "Failed to connect. Camera is null, maybe in use by another app or already released?");
+            throw new CameraException(CameraException.REASON_FAILED_TO_CONNECT);
+        }
         mCamera.setErrorCallback(this);
 
         // Set parameters that might have been set before the camera was opened.
@@ -179,8 +183,13 @@ public class Camera1Engine extends CameraBaseEngine implements
             LOG.e("onStartEngine:", "Failed to connect. Problem with camera params");
             throw new CameraException(e, CameraException.REASON_FAILED_TO_CONNECT);
         }
+        try {
             mCamera.setDisplayOrientation(getAngles().offset(Reference.SENSOR, Reference.VIEW,
                     Axis.ABSOLUTE)); // <- not allowed during preview
+        } catch (Exception e) {
+            LOG.e("onStartEngine:", "Failed to connect. Can't set display orientation, maybe preview already exists?");
+            throw new CameraException(CameraException.REASON_FAILED_TO_CONNECT);
+        }
         LOG.i("onStartEngine:", "Ended");
         return Tasks.forResult(mCameraOptions);
     }
@@ -222,7 +231,13 @@ public class Camera1Engine extends CameraBaseEngine implements
         mPreview.setStreamSize(previewSize.getWidth(), previewSize.getHeight());
         mPreview.setDrawRotation(0);
 
-        Camera.Parameters params = mCamera.getParameters();
+        Camera.Parameters params;
+        try {
+            params = mCamera.getParameters();
+        } catch (Exception e) {
+            LOG.e("onStartPreview:", "Failed to get params from camera. Maybe low level problem with camera or camera has already released?");
+            throw new CameraException(e, CameraException.REASON_FAILED_TO_START_PREVIEW);
+        }
         // NV21 should be the default, but let's make sure, since YuvImage will only support this
         // and a few others
         params.setPreviewFormat(ImageFormat.NV21);
@@ -240,7 +255,12 @@ public class Camera1Engine extends CameraBaseEngine implements
             Size pictureSize = computeCaptureSize(Mode.PICTURE);
             params.setPictureSize(pictureSize.getWidth(), pictureSize.getHeight());
         }
+        try {
             mCamera.setParameters(params);
+        } catch (Exception e) {
+            LOG.e("onStartPreview:", "Failed to set params for camera. Maybe incorrect parameter put in params?");
+            throw new CameraException(e, CameraException.REASON_FAILED_TO_START_PREVIEW);
+        }
 
         mCamera.setPreviewCallbackWithBuffer(null); // Release anything left
         mCamera.setPreviewCallbackWithBuffer(this); // Add ourselves