Create an application that will Demonstrate Button onClick() Event and change the TextView Color based on button Clicked

activity_main.xml

<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context=".MainActivity"
    >

    <TextView
        android:layout_margin="10dp"
        android:id="@+id/text_view"
        android:text="A sample text view"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:textSize="25dp"
        />

    <Button
        android:id ="@+id/btnClickMe"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center"
        android:text="Click Me"
        />

</LinearLayout>

MainActivity.java

package com.example.helloworld;

import androidx.appcompat.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.graphics.Color;


public class MainActivity extends AppCompatActivity {
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        Button btn = findViewById(R.id.btnClickMe);
        TextView tv = (TextView) findViewById(R.id.text_view);
        btn.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                tv.setTextColor(Color.RED);
                tv.setText("I'm Red Now...");
            }
        });
    }
}

Output


After clicking on the button