Develop Reference

How to create a circular icon for my Android app?

I just swapped my android launcher icon(just learned how). I noticed MANY icons on my android are circular and I am wondering do I have to get an image done like that OR is there way I can have the launcher put the icon(a png with transparent background) and draw a circle for the launcher somehow? (this would be easier that fooling around in some drawing tool as well).
In the app I used CircleImageView for contacts which did the circle but that was in java, and android launcher is xml so not sure if I can use CircleImageView?

You'll need to use adaptive icons instead of a single image to allow Android to adjust your icon. Essentially this is defining a background drawable and a foreground drawable, and Android will do the rest.
If you right click your res/drawable folder in Android Studio, then select New -> Image Asset, you will see the following wizard. This will let you easily create launcher icons that work in all shapes.
For further information you may find the official Android docs helpful, as well as Nick Butcher's excellent guide.

Android icon has white border on Pixel 3XL

I'm trying to implement a launcher icon for an Android app. I'm using Android Studio's New Image Asset capability to create the icon from an image file and it works in most places except for the later Pixels.
On the Pixel 3XL, it looks like the following figure. The icon with a round white border around it.
On the Pixel 2, it looks the same
But on an original Pixel, it looks right:
I created the icon assets using the Android Studio New Image Asset capability. Selecting the image icon as shown in the following figure:
Then I set the background to the background color for the icon:
Based on what the UI shows, the icons all look right and Android Studio is supposed to generate the right files for all target platforms. Can someone please help me understand what I need to do to get rid of that white border on later phones?

You should add ic_launcher_foreground.xml and ic_launcher_background.xml to drawable file in your project. As far as I get it, you've try to make red background then add red backgorund layout you have only foreground image in this way. Btw that is not a bug that is a feature :)

How to Remove white Background from icon?

I have an app on android that create home shortcut icon.
The image of the icon is image that i set programmatically from the drawable
Now the problem is, when the shortcut was created on the home screen it's created with white background.
How do i remove that white backgroubd and set image to full size of icon?
Thank you all..
EDIT: the app i was talking about is app that i developed using android studio and just want to set full size of image when i create home shortcut

This is highly dependent on the launcher you use. The image looks like the standard google android 8+ (?) icon shape.
I theory it could be part of the icon you created but since you are asking this I doubt it.
In older versions of android the outer shape of the icons were individual, while rather cool and the outline correctly shown while dragging them etc many complained about the lack of a uniform look of all the icons in the app drawer etc.
It was introduced to make all icons seem more uniform.
Long pressing an empty space in the Google Pixel launcher for example shows a choice to go into the settings for the launcher and there you can change the shape all icons should have:
In addition to this, apps can take advantage of the various shapes and adapt to them and fill them out so to speak. See for example the Chrome icon while changing the icon shapes in the launcher settings.
Introduced in android 8: The feature is called adaptive icons.
See the docs about adaptive icons here:
https://developer.android.com/guide/practices/ui_guidelines/icon_design_adaptive

That is because of adaptive icons - a feature of Android 8 and can't or shouldn't be changed. You can at best change the colour of the background.

i removed the white background from the launcher icon by following these guidelines https://developer.android.com/studio/write/image-asset-studio
a few more points
in the background layer, move the slider to resize the icon until you see no what would have been the white background.
in the manifest file, change the icons to reference the mipmap folder;
android:icon="#mipmap/yourlogo"
android:roundIcon="#mipmap/yourlogo"

Why my flutter app launcher icon in a circle? Can I use a square icon to replace this one?

I was using the following website to generate several launcher icons for my flutter app.
https://romannurik.github.io/AndroidAssetStudio/icons-launcher.html
But after I replace the original flutter icons ( file path: myapp/android/app/src/main/res ) and run my app, my icon is in a circled icon. ( check the image I attached )
My Android Virtual Device is Nexus 5X API 28.
So can anyone tell me what was wrong? And Can I use a square icon to replace this one?

The launcher that comes on the emulator forces all icons to be round. If the icon isn't already round, it will add a round border around it, like you see in that screenshot.
This isn't something you can change. If you want your icon to be square, use a different launcher. It's ultimately up to the user how their icons display.
You may want to consider implementing adaptive icons, so if a user does use circle or squircle icons and their icon pack/launcher forces all icons to be round, it at least won't look terrible.

why is my ic_launcher icon smaller than GooglePlay App's icons?

I have following issue, am developing an App for Android and I realise that the launch icon AKA ic_launcher is quite smaller than al the rest of the App that I got from GooglePlay.!see image below.. I tried as normal (on eclipse: new->android icon-set->....) using a 512x512 png file, then I gave a 2nd try using a recommended link I found by searching a solution (Android Asset Studio)
you may want to say " is not tooo much" but that is what I need, must be the same size as normal apps...
thanks in advance!
see the dotted line as reference to verify the size

Just create icon 512x512px without any generators, they add margins to a picture. You have to draw icon from border to border.
Use an existing application icon as a template, for example - mine