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

    <!--Ui component for our bar chart-->
    <com.github.mikephil.charting.charts.BarChart
        android:id="@+id/idBarChart"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

</RelativeLayout>

import android.graphics.Color;
import android.os.Bundle;

import androidx.appcompat.app.AppCompatActivity;

import com.github.mikephil.charting.charts.BarChart;
import com.github.mikephil.charting.data.BarData;
import com.github.mikephil.charting.data.BarDataSet;
import com.github.mikephil.charting.data.BarEntry;
import com.github.mikephil.charting.utils.ColorTemplate;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    // variable for our bar chart
    BarChart barChart;

    // variable for our bar data.
    BarData barData;

    // variable for our bar data set.
    BarDataSet barDataSet;

    // array list for storing entries.
    ArrayList barEntriesArrayList;

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

        // initializing variable for bar chart.
        barChart = findViewById(R.id.idBarChart);

        // calling method to get bar entries.
        getBarEntries();

        // creating a new bar data set.
        barDataSet = new BarDataSet(barEntriesArrayList, "Geeks for Geeks");

        // creating a new bar data and 
        // passing our bar data set.
        barData = new BarData(barDataSet);

        // below line is to set data 
        // to our bar chart.
        barChart.setData(barData);

        // adding color to our bar data set.
        barDataSet.setColors(ColorTemplate.MATERIAL_COLORS);

        // setting text color.
        barDataSet.setValueTextColor(Color.BLACK);

        // setting text size
        barDataSet.setValueTextSize(16f);
        barChart.getDescription().setEnabled(false);
    }

    private void getBarEntries() {
        // creating a new array list
        barEntriesArrayList = new ArrayList<>();

        // adding new entry to our array list with bar 
        // entry and passing x and y axis value to it.
        barEntriesArrayList.add(new BarEntry(1f, 4));
        barEntriesArrayList.add(new BarEntry(2f, 6));
        barEntriesArrayList.add(new BarEntry(3f, 8));
        barEntriesArrayList.add(new BarEntry(4f, 2));
        barEntriesArrayList.add(new BarEntry(5f, 4));
        barEntriesArrayList.add(new BarEntry(6f, 1));
    }
}