Solution:
Xml file
<?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/tv"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="Ness Wadia College of Commerce"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
android:textSize="20dp"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintHorizontal_bias="0.363"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.155" />
<Button
android:id="@+id/btnRed"
android:layout_width="122dp"
android:layout_height="65dp"
android:text="RED"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.134"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.31" />
<Button
android:id="@+id/btnBlue"
android:layout_width="122dp"
android:layout_height="65dp"
android:text="BLUE"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.837"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.309" />
<Button
android:id="@+id/btnGreen"
android:layout_width="122dp"
android:layout_height="65dp"
android:text="GREEN"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.134"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.468" />
<Button
android:id="@+id/btnYellow"
android:layout_width="122dp"
android:layout_height="65dp"
android:text="YELLOW"
android:textAppearance="@style/TextAppearance.AppCompat.Large"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintEnd_toEndOf="parent"
app:layout_constraintHorizontal_bias="0.837"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.468" />
</androidx.constraintlayout.widget.ConstraintLayout>
Main activity file
package com.example.changecolordemo;
import androidx.appcompat.app.AppCompatActivity;
import android.graphics.Color;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class MainActivity extends AppCompatActivity {
TextView tv;
Button btnRed,btnBlue,btnGreen,btnYellow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
tv = (TextView) findViewById(R.id.tv);
btnRed = (Button) findViewById(R.id.btnRed);
btnBlue = (Button) findViewById(R.id.btnBlue);
btnGreen = (Button) findViewById(R.id.btnGreen);
btnYellow = (Button) findViewById(R.id.btnYellow);
btnRed.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
tv.setTextSize(30F);
tv.setTextColor(Color.parseColor("#FF0000"));
}
});
btnBlue.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
tv.setTextSize(20F);
tv.setTextColor(Color.parseColor("#0000FF"));
}
});
btnGreen.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
tv.setTextSize(30F);
tv.setTextColor(Color.parseColor("#00FF00"));
}
});
btnYellow.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
tv.setTextSize(20F);
tv.setTextColor(Color.parseColor("#FFFF00"));
}
});
}
}
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