Develop Reference

GearVRf - SceneObject not visible with GVSphere Image

I am trying to show a dot/pointer on GVRSphereSceneObject in GearVR. But, only the GVRSphereSceneObject is showing where as scene object hides once the texture image becomes visible. If I add both sphere and object using addSceneObject, then image is shown on one side and rest of view is blacked out.
I couldn't find any issue regarding this and tried samples also. Any help will be greatly appreciated.
Here is the code for adding object over sphere.
Future<GVRTexture> texture = gvrContext.loadFutureTexture(new GVRAndroidResource(gvrContext, R.raw.pano));
GVRMaterial material = new GVRMaterial(gvrContext);
material.setMainTexture(texture);
boom = new GVRSphereSceneObject(gvrContext, 18, 36, false, material);
Pointer = new GVRSceneObject(gvrContext,
new FutureWrapper<>(gvrContext.createQuad(0.05f, 0.05f)),
gvrContext.loadFutureTexture(new GVRAndroidResource(this.gvrContext, R.drawable.target)));
Pointer.getRenderData().getMaterial().setColor(Colors.RED[0], Colors.RED[1], Colors.RED[2]);
Pointer.getTransform().setPosition(0.0f, 0.0f, -1.0f);
Pointer.setName("Pointer");
boom.addChildObject(Pointer);
scene.addSceneObject(boom);

If anyone is struggling with this. Please have a look at this issue.
Pointer.getRenderData().setDepthTest(false);
Pointer.getRenderData().setRenderingOrder(SXRRenderData.SXRRenderingOrder.OVERLAY);

Android OpenGL ES image filters

I found this example and I am making some filters on realtime camera. When I use GlassSphereFilter or SphereRefractionFilter I get sphere on black background, and I want to achieve something like this. Can anyone help me?
Here is part of the code:
view = new FastImageProcessingView(this);
pipeline = new FastImageProcessingPipeline();
view.setPipeline(pipeline);
setContentView(view);
input = new CameraPreviewInput(view);
filter = new SphereRefractionFilter(new PointF(0.43f, 0.5f), 0.25f, 0.71f, 0.5f);
screen = new ScreenEndpoint(pipeline);
input.addTarget(screen);
filter.addTarget(screen);
pipeline.addRootRenderer(input);
pipeline.startRendering();
Is there a way ti show two surfaceViews with camera in same time? One to show normal image and other to show sphere?

I think you should use this library :
https://github.com/CyberAgent/android-gpuimage

Skobbler Annotation disappears from map when zooming out on Android

Currently, I am adding a list of annotations to a mapview with code similar to the following:
// Add to map view
SKAnnotation annotation = new SKAnnotation(i++);
annotation.getLocation().setLongitude(result.longitude);
annotation.getLocation().setLatitude(result.latitude);
annotation.setMininumZoomLevel(1);
annotation.setAnnotationType(SKAnnotation.SK_ANNOTATION_TYPE_PURPLE);
mapView.addAnnotation(annotation, SKAnimationSettings.ANIMATION_POP_OUT);
Yet whenever I view the annotations on the map, they disappear after I zoom out to anything under zoom level 4.0. Looking at the docs for the Annotation class (as well as confirming in the code), I see that the default zoom level is set to 4, yet it seems that my call to .setMinimumZoomLevel is ignored.
Does anyone have any insight into what is happening or if this might be a known bug within the SDK?
I'm using Skobbler 2.5 on Android.
Thanks for any help in the matter!

Based off Ando's comment on the original question and referencing the documentation here, I updated the code to use the workaround he described to allow annotations to show up down to zoom level 2.
Original code:
SKAnnotation annotation = new SKAnnotation(i++);
annotation.getLocation().setLongitude(result.longitude);
annotation.getLocation().setLatitude(result.latitude);
annotation.setMininumZoomLevel(1); // Note: this does not work
annotation.setAnnotationType(SKAnnotation.SK_ANNOTATION_TYPE_PURPLE);
mapView.addAnnotation(annotation, SKAnimationSettings.ANIMATION_POP_OUT);
Updated code:
SKAnnotation annotation = new SKAnnotation(i++);
annotation.getLocation().setLongitude(result.longitude);
annotation.getLocation().setLatitude(result.latitude);
annotation.setMininumZoomLevel(2);
DisplayMetrics metrics = new DisplayMetrics();
getWindowManager().getDefaultDisplay().getMetrics(metrics);
if (metrics.densityDpi < DisplayMetrics.DENSITY_HIGH) {
annotation.setImagePath(SKMaps.getInstance().getMapInitSettings().
getMapResourcesPath() + "/.Common/icon_greypin#2x.png");
// set the size of the image in pixel
annotation.setImageSize(128);
} else {
annotation.setImagePath(SKMaps.getInstance().getMapInitSettings().
getMapResourcesPath()+ "/.Common/icon_greypin#3x.png");
// set the size of the image in pixels
annotation.setImageSize(256);
}
mapView.addAnnotation(annotation, SKAnimationSettings.ANIMATION_POP_OUT);
A couple things to note:
.setImagePath() and .setImageSize() are both deprecated methods in the latest SDK even though they're still referenced in the documentation above. Not sure if that means there is another alternative to displaying images via an absolute path approach, or if they're simply phasing this functionality out.
In my particular example, we're using the purple pin to display annotations, but the absolute path file name for that pin is actually called icon_greypin. It looks like the other pin image file name are named appropriately however.
Anyways, this served as a solution for my particular problem until the SDK is updated, so I'm marking it as the answer and I hope it helps someone else! Thanks to Ando for the step in the right direction!

How to find Center Point from geometry arcgis android?

I am developing one application in that i want to show call out in center of geometry on my map I am new to arcgis.I tried so much but i am unable to get call out in center,please anybody help me how to solve this problem
my code
SimpleFillSymbol sfs = new SimpleFillSymbol(
Color.RED);
sfs.setAlpha(5);
graphic = new Graphic(feature.getGeometry(),
sfs, feature.getAttributes());
Polygon polygon = (Polygon) graphic
.getGeometry();
int polygonpointscount=polygon.getPointCount();
if(polygonpointscount!=0)
{
pointsize=polygonpointscount/2;
}
Point midpoint = polygon.getPoint(pointsize);
Callout callout = mMapView.getCallout();
if (callout != null
&& callout.isShowing()) {
callout.hide();
}
//Set the content, show the view
callout.setContent(adminsearchloadView(governorate_Name,
area_Name,
block_Number));
callout.setStyle(R.xml.calloutstyle);
callout.setMaxHeight(100000);
callout.setMaxWidth(100000);
callout.refresh();
callout.show(midpoint);

Short answer: use GeometryEngine.getLabelPointForPolygon(Polygon, SpatialReference).
Long answer:
From your code...
int polygonpointscount=polygon.getPointCount();
if(polygonpointscount!=0)
{
pointsize=polygonpointscount/2;
}
Polygon.getPointCount() returns the vertices of the polygon. For example, if the polygon is a rectangle, getPointCount() returns the corners. So your Callout will be at one of the corners instead of at the centroid.
Instead, use GeometryEngine.getLabelPointForPolygon(Polygon, SpatialReference) . It doesn't guarantee to return the centroid, but it returns an interior point that is good for labeling (and it looks like the centroid to me). Make sure you pass a SpatialReference object that tells getLabelPointForPolygon what the spatial reference of your polygon is.
If you must have the centroid, you'll need to create a geoprocessing service based on ArcGIS's Feature to Point tool. However, getLabelPointForPolygon is much easier to implement and faster to execute and probably satisfies your need.

If you use arcgis server you can try "feature to point": http://resources.arcgis.com/en/help/main/10.1/index.html#//00170000003m000000 to calculate centroid layer.

Implement page curl on android?

I was surfing the net looking for a nice effect for turning pages on Android and there just doesn't seem to be one. Since I'm learning the platform it seemed like a nice thing to be able to do is this.
I managed to find a page here: http://wdnuon.blogspot.com/2010/05/implementing-ibooks-page-curling-using.html
- (void)deform
{
Vertex2f vi; // Current input vertex
Vertex3f v1; // First stage of the deformation
Vertex3f *vo; // Pointer to the finished vertex
CGFloat R, r, beta;
for (ushort ii = 0; ii < numVertices_; ii++)
{
// Get the current input vertex.
vi = inputMesh_[ii];
// Radius of the circle circumscribed by vertex (vi.x, vi.y) around A on the x-y plane
R = sqrt(vi.x * vi.x + pow(vi.y - A, 2));
// Now get the radius of the cone cross section intersected by our vertex in 3D space.
r = R * sin(theta);
// Angle subtended by arc |ST| on the cone cross section.
beta = asin(vi.x / R) / sin(theta);
// *** MAGIC!!! ***
v1.x = r * sin(beta);
v1.y = R + A - r * (1 - cos(beta)) * sin(theta);
v1.z = r * (1 - cos(beta)) * cos(theta);
// Apply a basic rotation transform around the y axis to rotate the curled page.
// These two steps could be combined through simple substitution, but are left
// separate to keep the math simple for debugging and illustrative purposes.
vo = &outputMesh_[ii];
vo->x = (v1.x * cos(rho) - v1.z * sin(rho));
vo->y = v1.y;
vo->z = (v1.x * sin(rho) + v1.z * cos(rho));
}
}
that gives an example (above) code for iPhone but I have no idea how I would go about implementing this on android. Could any of the Math gods out there please help me out with how I would go about implementing this in Android Java.
Is it possible using the native draw APIs, would I have to use openGL? Could I mimik the behaviour somehow?
Any help would be appreciated. Thanks.
****************EDIT**********************************************
I found a Bitmap Mesh example in the Android API demos: http://developer.android.com/resources/samples/ApiDemos/src/com/example/android/apis/graphics/BitmapMesh.html
Maybe someone could help me out on an equation to simply fold the top right corner inward diagnally across the page to create a similar effect that I can later apply shadows to to gie it more depth?

I'm doing some experimenting on page curl effect on Android using OpenGL ES at the moment. It's quite a sketch actually but maybe gives some idea how to implement page curl for your needs. If you're interested in 3D page flip implementation that is.
As for the formula you're referring to - I tried it out and didn't like the result too much. I'd say it simply doesn't fit small screen very well and started to hack a more simple solution.
Code can be found here:
https://github.com/harism/android_page_curl/
While writing this I'm in the midst of deciding how to implement 'fake' soft shadows - and whether to create a proper application to show off this page curl effect. Also this is pretty much one of the very few OpenGL implementations I've ever done and shouldn't be taken too much as a proper example.

I just created a open source project which features a page curl simulation in 2D using the native canvas: https://github.com/moritz-wundke/android-page-curl
I'm still working on it to add adapters and such to make it usable as a standalone view.
EDIT: Links updated.
EDIT: Missing files has been pushed to repo.

I'm pretty sure, that you'd have to use OpenGL for a nice effect. The basic UI framework's capabilities are quite limited, you can only do basic transformations (alpha, translate, rotate) on Views using animations.
Tho it might be possible to mimic something like that in 2D using a FrameLayout, and a custom View in it.