Monday, February 17, 2020

android kotlin ktx - QuoteSpan example

MainActivity.kt

package com.example.jetpack

import android.content.Context
import android.graphics.Color
import android.os.Build
import android.os.Bundle
import android.text.style.QuoteSpan
import androidx.appcompat.app.AppCompatActivity
import androidx.core.text.set
import androidx.core.text.toSpannable
import kotlinx.android.synthetic.main.activity_main.*


class MainActivity : AppCompatActivity() {

    private lateinit var context:Context

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

        context = this

        val text = ("Lorem Ipsum is simply dummy text of the printing and" +
                " typesetting industry.\n\nLorem Ipsum has been the industry's" +
                " standard dummy text ever since the 1500s, \n\nwhen an unknown" +
                " printer took a galley of type and scrambled it" +
                " to make a type specimen book.").toSpannable()

        // Quote span
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            text[0..1] = QuoteSpan(Color.GREEN,15,50)
        }else{
            text[0..1] = QuoteSpan(Color.GREEN)
        }

        // Another quote span
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
            text[text.indexOf("when")..text.length] = QuoteSpan(Color.RED,20,35)
        }else{
            text[text.indexOf("when")..text.length] = QuoteSpan(Color.RED)
        }

        textView.text = text
    }
}
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="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginStart="8dp"
        android:layout_marginTop="16dp"
        android:layout_marginEnd="8dp"
        android:padding="8dp"
        android:text=""
        android:textAppearance="@style/TextAppearance.AppCompat.Large"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent" />
</androidx.constraintlayout.widget.ConstraintLayout>
build.gradle dependencies[add]

// android ktx
implementation 'androidx.core:core-ktx:1.2.0'
build.gradle [add]

android {
    kotlinOptions {
        jvmTarget = JavaVersion.VERSION_1_8.toString()
    }
}
More android examples