Saturday, February 22, 2020

android kotlin - String chunked function example

MainActivity.kt 

package com.example.jetpack

import android.os.Bundle
import androidx.appcompat.app.AppCompatActivity
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)

        val string = "Lorem Ipsum is simply dummy text of the" +
                " printing and typesetting industry."
        textView.text = string

        // Splits this char sequence into a list
        // of strings each not exceeding the given size.
        val list:List<String> = string.chunked(15)

        // Loop through the list
        textView.append("\n\nString split by 15 chars...")
        list.forEach {
            textView.append("\n" + it)
        }


        // With given transform function to an each.
        val list2:List<String> = string.chunked(10){
            it.toString().toUpperCase()
        }

        // Loop through the list
        textView.append("\n\nString split by 10 chars with transform...")
        list2.forEach {
            textView.append("\n" + it)
        }
    }
}
activity_main.xml 

<?xml version="1.0" encoding="utf-8"?>
<androidx.constraintlayout.widget.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">
    <TextView
        android:id="@+id/textView"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:text="TextView"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        android:textColor="#DA1884"
        android:textStyle="normal"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
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