Custom Component in Android Programmatically

In this tutorial, we will discuss Custom Component in Android Programmatically. We can add TextView, Edittext,Datepicker, Timepickerr and many more.Let’s code and discuss how we can implement it programmatically.

MainActivity

package com.example.customattribute

import android.app.DatePickerDialog
import android.os.Bundle
import android.widget.Button
import android.widget.LinearLayout
import android.widget.TextView
import androidx.appcompat.app.AppCompatActivity
import androidx.appcompat.widget.AppCompatEditText
import java.text.SimpleDateFormat
import java.util.*


class MainActivity : AppCompatActivity() {

    lateinit var linearLayout:LinearLayout;
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        linearLayout=findViewById(R.id.ll)
        addEditTextView()
        addTextView()
        datePickerDialog()
    }

    private fun addEditTextView() {
        val edt = AppCompatEditText(this)
        edt.hint = "please input something"
        linearLayout.addView(edt)
    }

    private fun addTextView(){
        val tv=TextView(this)
        tv.setText("Text view")
        linearLayout.addView((tv))
    }

    private fun datePickerDialog(){
        val myCalendar = Calendar.getInstance()
        val btn=Button(this)
        btn.text="date picker"
        val tv=TextView(this)

        val date1 = DatePickerDialog.OnDateSetListener { _, year, monthOfYear, dayOfMonth ->
            myCalendar.set(Calendar.YEAR, year)
            myCalendar.set(Calendar.MONTH, monthOfYear)
            myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth)
            val myFormat = "dd/MM/yy"
            val sdf = SimpleDateFormat(myFormat, Locale.US)
            tv.text = sdf.format(myCalendar.time)
        }
        btn.setOnClickListener { DatePickerDialog(this, date1, myCalendar.get(Calendar.YEAR), myCalendar.get(Calendar.MONTH), myCalendar.get(Calendar.DAY_OF_MONTH)).show() }
        linearLayout.addView(btn)
        linearLayout.addView(tv)

    }

}

package com.example.customattribute

import android.app.DatePickerDialog

import android.os.Bundle

import android.widget.Button

import android.widget.LinearLayout

import android.widget.TextView

import androidx.appcompat.app.AppCompatActivity

import androidx.appcompat.widget.AppCompatEditText

import java.text.SimpleDateFormat

import java.util.*

class MainActivity : AppCompatActivity() {

lateinit var linearLayout:LinearLayout;

override fun onCreate(savedInstanceState: Bundle?) {

super.onCreate(savedInstanceState)

setContentView(R.layout.activity_main)

linearLayout=findViewById(R.id.ll)

addEditTextView()

addTextView()

datePickerDialog()

}

private fun addEditTextView() {

val edt = AppCompatEditText(this)

edt.hint = "please input something"

linearLayout.addView(edt)

}

private fun addTextView(){

val tv=TextView(this)

tv.setText("Text view")

linearLayout.addView((tv))

}

private fun datePickerDialog(){

val myCalendar = Calendar.getInstance()

val btn=Button(this)

btn.text="date picker"

val tv=TextView(this)

val date1 = DatePickerDialog.OnDateSetListener { _, year, monthOfYear, dayOfMonth ->

myCalendar.set(Calendar.YEAR, year)

myCalendar.set(Calendar.MONTH, monthOfYear)

myCalendar.set(Calendar.DAY_OF_MONTH, dayOfMonth)

val myFormat = "dd/MM/yy"

val sdf = SimpleDateFormat(myFormat, Locale.US)

tv.text = sdf.format(myCalendar.time)

}

btn.setOnClickListener { DatePickerDialog(this, date1, myCalendar.get(Calendar.YEAR), myCalendar.get(Calendar.MONTH), myCalendar.get(Calendar.DAY_OF_MONTH)).show() }

linearLayout.addView(btn)

linearLayout.addView(tv)

}

As you can see we have added 3 views. TextView,EditText and DatePickerDialog.

For TextView we created a view from Textview and added it to Linearlayout and same did for EditText.

For DatePickerDialog we create an instance of Calendar and created a button. After opening DatePicker Dialog we select date and show in Textview.

activity_main

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:id="@+id/ll"
    android:orientation="vertical"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

xmlns:tools="http://schemas.android.com/tools"

android:layout_width="match_parent"

android:id="@+id/ll"

android:orientation="vertical"

android:layout_height="match_parent"

tools:context=".MainActivity">

</LinearLayout>

please check screenshot how it shows

So Here we discussed Custom Component in Android Programmatically. Thanks for reading this blog and You can get other blogs from here

Ashwani Yadav 8 October 2021

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