How do I can customise every app icon using java? - android

I want to customize my android device with custom icons for every app. I have downloaded whicons, but they don't cover all apps, so Now I want to make my own icons for the apps that whicons doesn't cover in android studio. In conclusion I want to make app that can change other apps icons.
I haven't done anything yet, because I'm like new in java programming. I don't know much about android api.

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Android Studio, how to create a custom adaptive mipmap ic_launcher icon for API-26

I'm trying to update an existing app, it's been a few years since the last update and I've updated Android Studio to the most recent version v3.5.3. Among other things I want to change the app icon, so I've updated all the PNG files.
However, in the emulator it keeps showing the old default icon.
If I understand correctly, there is a new feature since API-26 which allows for something called adaptive app icons, but I can't figure out how to update this icon.
The #mipmap/ic_launcher.xml file seems to be some sort of vector file, which describes paths and strokeWidth and lines to construct the default icon. I tried and searched all over, but I have no clue how customize this type of icon to something with my business logo.
Do I have to turn my custom logo into a vector image? If so, how can I do this? Using which app or utility? Can't I still just use my PNG files like previously?

how can I include an in app icon picker in android studio?

I'm putting together an app that lets users create tags (cooking, tv, shopping, etc.) and I want to allow them to pick an icon to attach to the tag.
I haven't been able to find anything online, I think mostly because I can't word it in a way that is distinct enough from everyone that seems to be having problems with their apps actual icon. But I've seen it in plenty of apps in my day.
Is there any way to implement an in-app icon picker? Preferably a method that doesn't involve me having to individually add 100+ icons as resources in my project?
Look at this "icon picker dialog" at:
https://github.com/maltaisn/icondialoglib

How set badge number in home screen app icon android programatically?

I would like create app with custom badge number in app icon, like in facebook app: App icon in home screen shows pending/unread notifications. How to set custom badge number programatically in android. I've seen similar questions in stack with answers like it "doesn't support in stock android". Seen many answers and were old. I think they were for old versions. Is it possible in newer versions of android? If possible how to add customized badge number ? If the option is still doesn't support by android ignore this question and please let me know it. I'm developing kind of confidential app, so that i couldn't use third part libs. Is there any inbuilt methods to handle badges or possible to create badge?
There is popular github that works app icon badges for most Android devices. Sure still some platform, some devices didn't support that. But those libraries almost cover all of the devices that support app icon badges.
https://github.com/leolin310148/ShortcutBadger
So to your question, No.
Because Android framework didn't define the app notification badges before.(I am not sure if Android default framework have it now. I've been search the keyword of BADGE_COUNT_UPDATE in the ASOP android7 and nothing found) So all those custom badges are made by device manufacturer framework developer.
You can check how they setup badges numbers for each manufacturer here
https://github.com/leolin310148/ShortcutBadger/tree/master/ShortcutBadger/src/main/java/me/leolin/shortcutbadger/impl
To another question. I use keyword badge to search the ASOP source code and didn't find any noticeable part about app icon badges. And even there is one inbuilt framework method about this after certain version of android. The framework still cannot cover all the devices before the certain version. So not quite sure what do you mean by confidential app, but using libraries is the first choice to cover most android devices based on the real situation like this.

Styling Android App Template

My company downloaded the SmartJobBoard app for Android and iPhone (https://www.smartjobboard.com/android_app/). This app came with it's own styling (i.e. orange color). We are looking to make a few changes to the color.
I am from a web development background, and was wondering how would I go about stylizing the colors? Do I have to download the entire APK, change the colors, then re-upload it? Or is there a way to do it by changing the style document and having it go live immediately?
Apologies for being so new at this. I did a lot of reading but my situation seems pretty specific since I already have the app developed!
Thank you!

iphone-like widget library for Android

Are there any OSS libraries/collections that provide some of the look and feel of iPhone apps (i.e. bg colors, button, drop down list shape/colors, etc) for Android.
I've seen a few apps like that on the Google Market.
BTW I'm not talking about skinning the Android Home screen to make it look like iPhone.
The way to i did that is with Images, and adjust it. But i prefer a original UI, not a copy from iOS.

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