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ImageView hiding and showing

I'm struggling to get my android app to show and hide imageView objects programmatically. Actually I'm struggling to get expected behavior from imageView objects full stop.
Following the answers to this question,
Here's what I'm testing with:
public class MapsActivity extends FragmentActivity implements OnMapReadyCallback{
#Override
protected void onCreate(Bundle savedInstanceState) {
ImageView warn = (ImageView)findViewById(R.id.gpsStatusWarning);
warn.setImageResource(R.drawable.gps_error);
warn.getLayoutParams().height = 64;
warn.getLayoutParams().width = 64;
}
}
The above code is called in the parent activity's OnCreate method, and it does exactly what I expect: It changes the image of the object to be the one designated, and it sets the height and width of said object. However, what I can't seem to do is to set the object as INVISIBLE or GONE. I just can't make it vanish at all, in fact. I've tried both:
warn.setVisibility(View.INVISIBLE);
warn.setVisibility(View.GONE);
But the image is still visible. I've even tried changing it in the XML to
android:visibility="gone"
But even that hasn't helped. The image is still visible.
What am I doing wrong? Am I missing a call to some update method? Does setting the image resource force the image to be drawn?

Try :
warn.setImageResource(0);
Or : warn.setImageResource(android.R.color.transparent);

This is how you set the visibility of ImageView objects on Android programatically:
yourImage.setVisibility(View.VISIBLE);
yourImage.setVisibility(View.INVISIBLE);
yourImage.setVisibility(View.GONE);
You can also set the initial states of ImageView objects in XML layout files like this:
visibility="visible"
visibility="gone"
visibility="invisible"
You can follow the official documentation about ImageView controls to try it on yourself on this link below. Learn how to set the visibility state of a view.

imageView.setVisibility(View.GONE);
imageView.setVisibility(View.VISIBLE);

A button which allows an image to be shown in Android Studio

I am building my application using Android Studio, this app can upload an image from raspberry to my emulator. It works fine. What I want to do now is uploading this image and showing it directly to the user without searching it in the gallery. I thought about creating another class and setting this image as a background image in my xml file, but this is too much like I have to create another class every time I want to upload an image from my raspberry.
Can someone help me please. Thank you

If I'm understanding your question correctly, you'd like to load an image from the Android filesystem into your app and display it to the user.
Drawable, Android's generalized image class, allows you to load from file via Drawable#createFromPath.
This SO question suggests Drawable#createFromPath doesn't work on paths beginning with file://, so depending on your use case you may want to precede that with Uri#parse/Uri#getPath.
Once you have a Drawable, you can display it in one of two ways: put an ImageView in your app and call its setImageDrawable method, or set the Drawable as your background image via View#setBackground (note that setBackground was only added in API 16 - in prior versions, you should call View#setBackgroundDrawable).
Putting all of this together, we end up with the following (untested):
private void loadImage(String imagePath) {
Uri imageUri;
String fullImagePath;
Drawable image;
ImageView imageDisplay;
imageUri = Uri.parse(imagePath);
fullImagePath = imageUri.getPath();
image = Drawable.createFromPath(fullImagePath);
imageDisplay = (ImageView) findViewById(R.id.imageDisplay);
/*if image is null after Drawable.createFromPath, this will simply
clear the ImageView's background */
imageDisplay.setImageDrawable(image);
/*if you want the image in the background instead of the foreground,
comment the line above and uncomment this bit instead */
//imageDisplay.setBackground(image);
}
You should be able to modify this to work with any View just by replacing imageDisplay's declared type with the appropriate View type and changing the cast on findViewById. Just make sure you're calling setBackground, not setImageDrawable, for a non-ImageView View.

Getting image from Webview to ImageView

I have a custom WebView. Inside it I've got an image. The WebView is zoomable. I want to reset zoom when I click a button, extract image from there and place inside ImageView.
So far, with the help of x-code I've managed to write this in onClickListener:
while (wv2.zoomOut()){
wv2.setDrawingCacheEnabled(true);
bitmap = Bitmap.createBitmap(wv2.getDrawingCache());
bitmapPath = bitmap;
wv2.setDrawingCacheEnabled(false);
new Thread(new Runnable() {
public void run() {
SaveImage(bitmap);
}
}).start();
tstImage.setImageBitmap(bitmap);
}
The WebView zooms out completely, but the Bitmap I get in ImageView is slightly zoomed in. I need to click 1 more time to get the whole bitmap inside the ImageView

I would say that the Javadoc of WebView.getDrawingCache() method explains your problem.
public Bitmap getDrawingCache (boolean autoScale)
...
Note about auto scaling in compatibility mode: When auto scaling is
not enabled, this method will create a bitmap of the same size as this
view. Because this bitmap will be drawn scaled by the parent
ViewGroup, the result on screen might show scaling artifacts. To avoid
such artifacts, you should call this method by setting the auto
scaling to true. Doing so, however, will generate a bitmap of a
different size than the view. This implies that your application must
be able to handle this size.
In your code you simply have to make this change
bitmap = Bitmap.createBitmap(wv2.getDrawingCache(true));

JavaFX indeterminate progress dialog overlay

I have a WebView.
When loading stuff that takes a long time, I want the WebView to be overlaid with a loading dialog that looks like the progress dialog in phones - the one with the circular spinning thing, and darken the screen area that is not covered by the dialog.
Additionally, I want to make it impossible for the user to click on anything on the WebView until it is ready.
How do I achieve this effect in Java 8?

when you need the loading call this
private void inUrFace(){
Dialog<Void> dialog = new Dialog<>();
dialog.initModality(Modality.WINDOW_MODAL);
dialog.initOwner(stage);//stage here is the stage of your webview
dialog.initStyle(StageStyle.TRANSPARENT);
Label loader = new Label("LOADING");
loader.setContentDisplay(ContentDisplay.DOWN);
loader.setGraphic(new ProgressIndicator());
dialog.getDialogPane().setGraphic(loader);
DropShadow ds = new DropShadow();
ds.setOffsetX(1.3); ds.setOffsetY(1.3); ds.setColor(Color.DARKGRAY);
dialog.getDialogPane().setEffect(ds);
dialog.showAndWait();}
double check the code. should give you something of that sort.

Activity Indicator in GWT MAP

What I would like to have is an activity indicator, which is displayed after my app is up and running, but while GWT is making AJAX calls.
For example have a look at following site : http://www.foodtrucksmap.com/#
Any ideas on how to achieve it?

You can use an activity indicator from here, they are animated gifs so you can display one like this:
<g:Image ui:field="activityImage"/>
MyResources resources = GWT.create(MyResources.class);
this.activityImage.setResource(resources.activityImage());
and in your resources interface you would set the image:
public interface MyResources extends ClientBundle{
// use the actual path to your image
#Source("../resources/images/activityImage.gif")
ImageResource activityImage();
}
When you make your async calls:
loadingImage.setVisible(true);
and in the callback:
loadingImage.setVisible(false);

I had to deal with the same kind of stuff few days back. The way I did was, created an Icon and Overlayed on the map.
Icon icon = Icon.newInstance("loading.gif"); // load you gif as icon
MarkerOptions options = MarkerOptions.newInstance();
options.setIcon(icon);
Marker indicator = new Marker(point, options);
So before the Async call and after you map is up, just add the icon to the map using
map.addOverlay(indicator);
and after the Async call remove the overlay using
map.removeOverlay(indicator);
I am not sure how correct this approach is, but this is what I did and it worked.