sudansh

Get the SHA256 pin to be used in okhttp 
https://www.ssllabs.com/ssltest/analyze.html


Sha256 from PEM file
openssl x509 -in cert.pem -pubkey -noout | openssl pkey -pubin -outform der | openssl dgst -sha256 -binary | openssl enc -base64

sudansh

import androidx.recyclerview.widget.GridLayoutManager
import androidx.recyclerview.widget.LinearLayoutManager
import androidx.recyclerview.widget.RecyclerView
import androidx.recyclerview.widget.StaggeredGridLayoutManager

abstract class PaginationScrollListener : RecyclerView.OnScrollListener {
	private val mLayoutManager: RecyclerView.LayoutManager
	private val startingPageIndex = 0
	private var visibleThreshold = 5
	private var currentPage = 0

sudansh

Collapse doesn't work when marginBottom is used in layout with appbar_scrolling_view_behavior. Instead use paddingBottom

sudansh

Ripple: 

use `android:background="?attr/selectableItemBackground"`
the difference is that selectableItemBackground will keep the ripple within it's view size(width/height). selectableItemBackgroundBorderless will expand it's ripple over other views (like the official calculator app ripple)

sudansh

1. //automatically handles back button 
toolbar.setupWithNavController(navController)

2. //to make root fragment (or make back button gone in a particular fragment).
//This removes the back button and also disabled toolbar back button navigation (keyboard back button works)
private val rootIds = setOf(R.id.fragment1, R.id.fragment2....)
private val appBarConfiguration by lazy {AppBarConfiguration(rootIds)}
toolbar.setupWithNavController(navController,appBarConfiguration)

3. //for back button to work along with (2).

sudansh

<RelativeLayout
 android:layout_width="match_parent"
 android:layout_height="wrap_content">
  <androidx.recyclerview.widget.RecyclerView
   android:layout_width="match_parent"
   android:layout_height="wrap_content" />
</RelativeLayout>