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programming with api level 21 in android studio

I want to write an android app in android studio. I need API level 21 for permissions in install time not in run time, but android studio does not allow to use api level 21. The error is:
Google play requires that apps target API level 26 or higher...
Is there any way i write my program in api level 21 in year 2019!!!?
error in gradle

Set targetSdkVersion to 26 & minSdkVersion to 21.0 in "build.gradle".

How do i upgrade my android target API in Meteor

I am building an android app with Meteor/Cordova. My meteor is currently version 1.5, Cordova 4.3.0. My default build uses API 25 but when I try to submit my APK to the play store, I get this message:
Your app currently targets API level 25 and must target at least API level 26 to ensure it is built on the latest APIs optimized for security and performance. Change your app's target API level to at least 26
.
How do I upgrade to API level 26?

inside mobile-config.js add
App.setPreference('android-targetSdkVersion', '26');

Go to gradle, and search for targetSdkVersion = 25 . Change it to use android targetSdkVersion = 26

Issues executing code on higher API levels Android

My minSDK version is 16 and my targetSDK version is 27. The compileSDK version is 28.
Since the targetSDK version is 27 it should run on Oreo(8.0.0) without issues but some of the features don't work as intended. However they do work fine on Nougat.
Why is this so?

The targetSDK is stating what you built in the app to be able to handle. So, there might be a new feature in API 28 and you're saying your code was build against API 27 so if you're running on API 28 and there is support on 28 for how you used the api before, then it will try to maintain your API 27 coded behavior. There still exists the possibility your API 27 code will result in different or wrong behavior if run on API 28 though.
Please review the documentation as well:
https://developer.android.com/guide/topics/manifest/uses-sdk-element
"To maintain your application along with each Android release, you should increase the value of this attribute to match the latest API level, then thoroughly test your application on the corresponding platform version."

Newbie in Android: minSdkVersion vs compileSdkVersion

Hy,
I have some basic doubts about developing with android studio:
minSdkVersion 15: with this configuration I am forcing to use only
the features from api level 15 and not higher. Is correct? For what I
read I dont think so
minSdkVersion 15 and compileSdkVersion 24: with this configuration I
can use api level until level 24. Is this correct?
minSdkVersion 15 and compileSdkVersion 23: with this configuration if I
use api features from api 23, this application wont work in an android
device with api level 20 for example, right?
With the previous configuration, and android device with api level 20
will be able to download and install the application because its api is
higher than the minSdkVersion 15 but will not be able to run because it
has features from api 23, right?
If I want to make sure that I want to use an api level and not higher
because of the previous problems commented, the configuration minSdkVersion 15 and compileSdkVersion 15 is the only way? is a common
practice?
Thanks a lot!

minSdkVersion 15: with this configuration I am forcing to use only the features from api level 15 and not higher. Is correct?
No. A minSdkVersion of 15 means that you do not want your app to run on devices with a lower API level than that. 15 corresponds to Android 4.0.3.
minSdkVersion 15 and compileSdkVersion 24: with this configuration I can use api level until level 24. Is this correct?
Your IDE will allow you to write code using classes, methods, fields, etc. from API Level 24. Your IDE should also warn you that using classes, methods, fields, etc. that were added to the SDK after API Level 15 may result in runtime errors.
minSdkVersion 15 and compileSdkVersion 23: with this configuration if I use api features from api 23, this application wont work in an android device with api level 20 for example, right?
Well, API Level 20 is a special Android version for the first-generation Android Wear devices. But if we switch that to API Level 19 (Android 4.4), if you blindly call an Android 5.1 (API Level 23) method, you will crash on Android 4.4. This is why the IDE will warn you about this, why you often see checks of BuildConfig.VERSION.SDK_INT, and why the SDK has these ...Compat classes (which try to hide a lot of these version differences).
With the previous configuration, and android device with api level 20 will be able to download and install the application because its api is higher than the minSdkVersion 15 but will not be able to run because it has features from api 23, right?
The device will attempt to run the app. How far it gets depends on how well the app is written. Again, you can create an app that uses newer-API features that gracefully degrades to run on older devices. This is not significantly different than how a Web site or Web app might want to use the latest HTML5 features but gracefully degrades to handle older or less-capable browsers.
If I want to make sure that I want to use an api level and not higher because of the previous problems commented, the configuration minSdkVersion 15 and compileSdkVersion 15 is the only way?
No. Again, the IDE will (usually) yell at you when you try using SDK features that are acceptable for the compileSdkVersion but are newer than the minSdkVersion.
is a common practice?
Not since 2010 or so.
FWIW, here is the documentation on this subject, limited as it may be.

I need Android With API 23

I cant Find Android With API 23 as well as System Image and Source With Direct Link , I need Android With API 23 and All things is Important for Android Programming With API 23

Please look at my answer here:
Downgrading from API 24 to API 23
You only need to change the minSdkVersion in build.gradle(Module app) fileto 23.