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        inputProofNumber1.getEditText().addTextChangedListener(new TextWatcher() {
            @Override
            public void beforeTextChanged(CharSequence s, int start, int count, int after) {
                Log.d(TAG, "beforeTextChanged: "+s);
            }

            @Override
            public void onTextChanged(CharSequence s, int start, int before, int count) {
                Log.d(TAG, "onTextChanged: "+s);
            }

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Implementing Internet Connectivity Checker in Android Apps
Amr Salah
Amr Salah
4 days ago·5 min read

Image for post
Photo by Rami Al-zayat on Unsplash
Working on an Android chat app? social media app? or any other internet-based app that you want to check if there is an internet connection in order to continue a process or even notify the user about their network state? This guide comes to the rescue!
You may say: “Hey! There is already an API which gets this job done.”
Yes, there is! Well, although Android SDK provides API that you can use to get network state of user’s device like ConnectivityManager, it does not actually check whether there is an active internet connection. Concretely, try establishing a hotspot from mobile device “A” but do not turn on mobile data or wifi, then connect mobile device “B” to that hotspot of “A”.

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Android Infinite Auto Image Slider using View Pager 2 | Android Studio | Java
Golap Gunjan Barman
Golap Gunjan Barman
Feb 13 · 5 min read
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In this tutorial, we will create an infinite auto image slider using view pager 2. For infinite sliding, we will implement a new technique that saves memory for loading images.

Add the dependency
Before implementation, it adds the dependency for the view pager 2 and rounded image view.

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import android.content.Context;
import android.os.Handler;
import android.util.AttributeSet;
import android.widget.TextView;

public class TypeWriter extends TextView {

    private CharSequence mText;
    private int mIndex;
    private long mDelay = 150; //Default 150ms delay

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package com.example.uicomponents

import android.content.Context
import android.os.Handler
import android.util.AttributeSet
import android.widget.TextView

class TypeWriteTextView(context: Context?, attrs: AttributeSet?) : TextView(context, attrs) {
    
    private var textList: List<String> = emptyList()

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package com.omarkrostom.arclayoutmanager

import android.content.Context
import android.view.ViewGroup.LayoutParams.MATCH_PARENT
import android.view.ViewGroup.LayoutParams.WRAP_CONTENT
import androidx.recyclerview.widget.RecyclerView
import kotlin.math.*

class ArcLayoutManager(
    private val context: Context,

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    private fun fill(recycler: RecyclerView.Recycler?, state: RecyclerView.State?) {
        detachAndScrapAttachedViews(recycler ?: return)

        for (itemIndex in 0 until itemCount) {
            val view = recycler.getViewForPosition(itemIndex)
            addView(view)

            val viewWidth = pxFromDp(context, ITEM_WIDTH)
            val viewHeight = pxFromDp(context, ITEM_HEIGHT)

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class ArcLayoutManager(
    private val context: Context,
    private var horizontalOffset: Int = 0
) : RecyclerView.LayoutManager() {
    override fun generateDefaultLayoutParams(): RecyclerView.LayoutParams =
        RecyclerView.LayoutParams(MATCH_PARENT, WRAP_CONTENT)

    override fun canScrollHorizontally(): Boolean = true

    override fun scrollHorizontallyBy(

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package com.omarkrostom.arclayoutmanager

import android.view.ViewGroup
import androidx.recyclerview.widget.RecyclerView

class ArcLayoutManager: RecyclerView.LayoutManager() {
    override fun generateDefaultLayoutParams(): RecyclerView.LayoutParams =
            RecyclerView.LayoutParams(ViewGroup.LayoutParams.MATCH_PARENT, ViewGroup.LayoutParams.WRAP_CONTENT)
}

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private fun computeYComponent(viewCenterX: Float,
                              h: Float): Pair<Int, Double> {
    val screenWidth = context.resources.displayMetrics.widthPixels
    val s = screenWidth.toDouble() / 2
    val radius = (h * h + s * s) / (h * 2)

    val xScreenFraction = viewCenterX.toDouble() / screenWidth.toDouble()
    val beta = acos(s / radius)

    val alpha = beta + (xScreenFraction * (Math.PI - (2 * beta)))