Bar Chart in Android

Create new project in Android Studio with steps as below:

Open res\values\strings.xml file and add new string as below:

<resources>
    <string name="app_name">Learn Android with Real Apps</string>
</resources>

Open build.gradle file in Gradle Scripts and add new library as below:

repositories {
    maven { url 'http://repo1.maven.org/maven2' }
    maven { url 'https://jitpack.io' }
}

dependencies {
    implementation 'com.github.PhilJay:MPAndroidChart:v3.0.3'
}

Open res\layout\activity_main.xml file and create layout as below:

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#ffffff"
    android:orientation="vertical"
    tools:ignore="HardcodedText" >

    <com.github.mikephil.charting.charts.BarChart
        android:id="@+id/barChart"
        android:layout_width="match_parent"
        android:layout_height="match_parent"/>

</LinearLayout>

Add code to MainActivity.java in android.demo.learnandroidwithrealapps package as below:

package android.demo.learnandroidwithrealapps;

import android.graphics.Color;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;

import com.github.mikephil.charting.charts.BarChart;
import com.github.mikephil.charting.components.Description;
import com.github.mikephil.charting.components.XAxis;
import com.github.mikephil.charting.components.YAxis;
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.interfaces.datasets.IBarDataSet;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

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

    private void drawChart() {
        BarChart barChart = findViewById(R.id.barChart);
        barChart.setDrawBarShadow(false);
        barChart.setDrawValueAboveBar(true);
        Description description = new Description();
        description.setText("");
        barChart.setDescription(description);
        barChart.setMaxVisibleValueCount(50);
        barChart.setPinchZoom(false);
        barChart.setDrawGridBackground(false);

        XAxis xl = barChart.getXAxis();
        xl.setGranularity(1f);
        xl.setCenterAxisLabels(true);

        YAxis leftAxis = barChart.getAxisLeft();
        leftAxis.setDrawGridLines(false);
        leftAxis.setSpaceTop(30f);
        barChart.getAxisRight().setEnabled(false);

        //data
        float groupSpace = 0.04f;
        float barSpace = 0.02f;
        float barWidth = 0.46f;

        int startYear = 1980;
        int endYear = 1985;

        List<BarEntry> yVals1 = new ArrayList<BarEntry>();
        List<BarEntry> yVals2 = new ArrayList<BarEntry>();

        for (int i = startYear; i < endYear; i++) {
            yVals1.add(new BarEntry(i, 0.4f));
        }

        for (int i = startYear; i < endYear; i++) {
            yVals2.add(new BarEntry(i, 0.7f));
        }

        BarDataSet set1, set2;

        if (barChart.getData() != null && barChart.getData().getDataSetCount() > 0) {
            set1 = (BarDataSet) barChart.getData().getDataSetByIndex(0);
            set2 = (BarDataSet) barChart.getData().getDataSetByIndex(1);
            set1.setValues(yVals1);
            set2.setValues(yVals2);
            barChart.getData().notifyDataChanged();
            barChart.notifyDataSetChanged();
        } else {
            set1 = new BarDataSet(yVals1, "Company A");
            set1.setColor(Color.rgb(104, 241, 175));
            set2 = new BarDataSet(yVals2, "Company B");
            set2.setColor(Color.rgb(164, 228, 251));

            ArrayList<IBarDataSet> dataSets = new ArrayList<IBarDataSet>();
            dataSets.add(set1);
            dataSets.add(set2);

            BarData data = new BarData(dataSets);
            barChart.setData(data);
        }

        barChart.getBarData().setBarWidth(barWidth);
        barChart.groupBars(startYear, groupSpace, barSpace);
        barChart.invalidate();

    }

}