Develop Reference

Android 6 - Removing Icon's Grey Padding

My app's icon has been displaying fine on Android devices prior to 6.0. Now on 6.0 devices there's a thick dark grey padding around the icon (please see the lower left icon in screenshot). My icon image has a white background with rounded edges.
I've ensured my icons have the resolutions for xxhdpi (144x144) and xxxhdpi (192x192), and I've checked the APK files to see the icons properly placed in the corresponding res/drawable-xxxx folders.
I've also tried regenerating the icons using Android Studio and online Android icon makers, as well as placing them in drawable / mipmap folders, but the same problem persisted.
How do I allow the icon to expand to the full size without the dark grey padding?
Thank you.

Easily you can use android studio Image Asset
click on app folder.
File => new => Image asset => select icon type as launcher icons => you can select image and browse => adjust
padding,and color => next => finish.

First : make sure that you icons are sliced probably without any padding.
Second : use mipmap folders for app launcher icons and make sure icons for all sizes.
Third : uninstall you application, clean & build and install fresh one.
hope this can help

That can be disabled by:
Go to Settings > Display > Icon backgrounds
Select Icons only

Blurry Launcher Icons

I am trying to add a launcher icon to my Android application, but something seems wrong with resolution whan app is installed. The device I'm working with has an XHDPI screen, so I am testing with a 96x96 (px) image. I used the Image Asset in Android Studio to generate a default icon:
This is the result in my device:
You can notice that the image is a bit blurry, as it has been resized. It happens with every icon I make. What is happening? I am using MIUI, altough it doesn't appears to affect to the other icons.
EDIT: My launcher icon is inside the mipmap folder.

Remove Your file from mipmap-anydp-v26 folder..
it might work for you like me

Place your launcher icons in the mipmap folders instead of drawable. Some phones scale launcher icons up. Putting you launch icons in mipmap folders will have the phone use a large resolution icon if needed.
mipmap vs drawable folders

If it is a PNG file try using a vector image

Which .png file do I have to replace for changing Icon symbol in Android Studios

When you code on Android Studio there is a standard icon symbol ( green Android ). I know how to change it. When I go to manifests.xml and look at this line
android:icon="#mipmap/ic_launcher"
the icon launcher must be in the directory "mipmap". When I go to mipmap, there are several .png files of ic_launcher.
Such as
ic_launcher.png(hdpi)
ic_launcher.png(mdpi)
ic_launcher.png(xhdpi)
ic_launcher.png(xxhdpi)
ic_launcher.png(xxxhdpi)
The question now is which of these files do I have to replace in order to get a new custom icon? Thank you.

You should use the Image Asset wizard. This allows you to add an Image Launcher which is the kind of image for your App's logo
Image Asset Pop-up Menu
Image Asset will ensure all resolutions and sizes for the logo.

They are categorized according to the size of screen for example tablet users uses xxhdi ic_launcher.png and hdpi ic_launcher.png for small size screen like 3 inches screen. If you are developing cool apps then you need to resize your icons for all these mentions size otherwise you can make any size and call them in manifest.

All of them because each one of them means that the icon will be displayed on the device depending on the size of the screen that is "from the smallest to the largest".
A tip if you are going to use the same icon for each one, first create the bigger image and then reduce it, I think the same android studio is reduced when you use the option because of the icon I think you can call application icon.
The biggest image is 512, this is the image of the web that will be displayed in the Play Store

What is the right size for vector drawable icons?

What is the correct size to choose for Vector Drawable icons e.g. when importing them from SVG?
There is a lot of information about standard icon dimensions for raster icons, for example this site. However, I'm a little bit struggling to get icons imported from SVG appear normally, I'm basically determining them by trial and error.
Particularly interested in launcher and notification icon sizes. I've currently settled on 192x192 for launcher icons and 48x48 for notification icons.
Using a smaller size for launcher icons results in a blurred icon on my KitKat tablet and using a larger size looks bad as well.
But the notification icon still appears larger than in other apps so it should probably be something like 32x32.

You choose what is the best, what it depends on is the version of Android, the default is 24x24 dp

Sizes of an image to put as action bar

In my app I put an image as actionbar
getActionBar().setBackgroundDrawable(getResources().getDrawable(R.drawable.header_edea));
The code is right, but I need the sizes for the different densities (ldpi, hdpi, etc).

Check the following link:
Design layout to support multiple screen
on Android Studio, you can choose an image for different layout sizes.for example, you add that image on Project -> new -> ImageAsset and it will show you or it will create that image for different sizes with different directories.(you can see the results in different drawable folders or mipmap folder with different sizes).
And after that, you just have to choose it and it will fix that for different sizes.

Android Studio has already a tool called Asset Studio described in LinX64.
For this purpose you can also check an online tool created by Roman Nurik called Android Asset Studio, which helps you to generate all needed image sizes: https://romannurik.github.io/AndroidAssetStudio/
Check this links - the first is a guide about creating icons, the second one give you information about all needed icon sizes for Android purposes like notifications or action bar:
Google's Design -
Icons
Icon Reference
Chart
Also on StackOverlow:
Action Bar icon size
Actionbar Logo size?
Hope it help