How to Change Text Color in Android App with Java Android Studio Tutorials 2022

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Text Color of a Substring - Android Studio - Java

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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"
    android:padding="10dp"
    tools:context=".MainActivity">


    <TextView
        android:padding="10dp"
        android:id="@+id/text_view"
        android:textSize="25sp"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!"
        android:layout_centerInParent="true" />




</RelativeLayout>

MainActivity.java

package com.usmtip.myapplication;



import android.graphics.Color;
import android.os.Bundle;
import android.text.SpannableString;
import android.text.Spanned;
import android.text.style.ForegroundColorSpan;
import android.widget.TextView;


import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;


public class MainActivity extends AppCompatActivity {



    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);



        //TextView
        TextView mTextView = findViewById(R.id.text_view);

        //text to set in TextView
        String mText = "Let's color some substrings: RED color, GREEN color, and BLUE color";

        //creating spannable string from normal string, we will use it to apply forgroundcolorspan to substring
        SpannableString mSpannableString = new SpannableString(mText);

        //color styles to apply on substrings
        ForegroundColorSpan mRed = new ForegroundColorSpan(Color.RED); //red color
        ForegroundColorSpan mGreen = new ForegroundColorSpan(Color.GREEN); //green color
        ForegroundColorSpan mBlue = new ForegroundColorSpan(Color.BLUE); //blue color

        //applying color styles to substrings
        mSpannableString.setSpan(mRed, 29, 32, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        mSpannableString.setSpan(mGreen, 38, 46, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);
        mSpannableString.setSpan(mBlue, 56, 61, Spanned.SPAN_EXCLUSIVE_EXCLUSIVE);

        //setting text to TextView
        mTextView.setText(mSpannableString);
    }
}