Saturday, February 22, 2020

android kotlin - String all and any 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 = "This is Android SDK 29"
        textView.text = string

        // Returns true if all characters match the given predicate.
        val result:Boolean = string.all{
            it.isDigit()
        }
        textView.append("\n\nIs this string contain only digit? $result")

        // Returns true if at least one character matches the given predicate.
        val result2:Boolean = string.any() {
            it.isDigit()
        }
        textView.append("\n\nIs this text contain any digit? $result2")
    }
}
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="wrap_content"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:text="TextView"
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        android:textStyle="normal"
        android:textColor="#4B5320"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
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