From here you can be able to display the Bar Graphs through android applications. First of all you need to add achartengine-1.0.0.jar to your project . Which can be easily downloaded from here

Now you can use the following activity, in which i have tried to show the comparison between income,expenditure and savings throughout the year.

package com.barchartexample;

import org.achartengine.ChartFactory;
import org.achartengine.chart.BarChart.Type;
import org.achartengine.model.XYMultipleSeriesDataset;
import org.achartengine.model.XYSeries;
import org.achartengine.renderer.XYMultipleSeriesRenderer;
import org.achartengine.renderer.XYSeriesRenderer;

import android.os.Bundle;
import android.app.Activity;
import android.content.Intent;
import android.graphics.Color;
import android.view.Menu;

public class MainActivity extends Activity {

private String[] monthArray = new String[] {
        "Jan", "Feb" , "Mar", "Apr", "May", "Jun",
        "Jul", "Aug" , "Sep", "Oct", "Nov", "Dec"
    };

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

    showBarChart();
}

private void showBarChart(){
    int[] x = { 0,1,2,3,4,5,6,7 };
    int[] income = { 2000,2500,2700,3000,2800,3500,3700,3800};
    int[] expense = {2200, 2700, 2900, 2800, 2600, 3000, 3300, 3400 };
    int[] saving = {1800, 2000, 2200, 1600, 1400, 2500, 2800, 3000 };




    // Creating an  XYSeries for Income
    //CategorySeries incomeSeries = new CategorySeries("Income");
    XYSeries incomeSeries = new XYSeries("Income");
    // Creating an  XYSeries for Income
    XYSeries expenseSeries = new XYSeries("Expense");
    // Creating an  XYSeries for Saving
    XYSeries savingSeries = new XYSeries("Saving");

    // Adding data to Income and Expense Series
    for(int i=0;i<x.length;i++){            
        incomeSeries.add(i,income[i]);
        expenseSeries.add(i,expense[i]);
        savingSeries.add(i,saving[i]);
    }


    // Creating a dataset to hold each series
    XYMultipleSeriesDataset dataset = new XYMultipleSeriesDataset();
    // Adding Income Series to the dataset
    dataset.addSeries(incomeSeries);
    // Adding Expense Series to dataset
    dataset.addSeries(expenseSeries);  
    // Adding Saving Series to dataset
    dataset.addSeries(savingSeries);


    // Creating XYSeriesRenderer to customize incomeSeries
    XYSeriesRenderer incomeRenderer = new XYSeriesRenderer();
    incomeRenderer.setColor(Color.rgb(130, 130, 230));
    incomeRenderer.setFillPoints(true);
    incomeRenderer.setLineWidth(5);
    incomeRenderer.setDisplayChartValues(true);

    // Creating XYSeriesRenderer to customize expenseSeries
    XYSeriesRenderer expenseRenderer = new XYSeriesRenderer();
    expenseRenderer.setColor(Color.rgb(220, 80, 80));
    expenseRenderer.setFillPoints(true);
    expenseRenderer.setLineWidth(5);
    expenseRenderer.setDisplayChartValues(true);

    XYSeriesRenderer savingRenderer = new XYSeriesRenderer();
    savingRenderer.setColor(Color.rgb(280, 100, 50));
    savingRenderer.setFillPoints(true);
    savingRenderer.setLineWidth(5);
    savingRenderer.setDisplayChartValues(true);


    // Creating a XYMultipleSeriesRenderer to customize the whole chart
    XYMultipleSeriesRenderer multiRenderer = new XYMultipleSeriesRenderer();
    multiRenderer.setXLabels(0);
    multiRenderer.setChartTitle("Income, Expense and Saving Chart");
    multiRenderer.setXTitle("Year 2014");
    multiRenderer.setYTitle("Amount in Rupee");
    multiRenderer.setZoomButtonsVisible(true);  
    multiRenderer.setBarSpacing(0.5);

    for(int i=0; i< x.length;i++){
        multiRenderer.addXTextLabel(i, monthArray[i]);  
    }       

    // Adding incomeRenderer and expenseRenderer to multipleRenderer
    // Note: The order of adding dataseries to dataset and renderers to multipleRenderer
    // should be same

    multiRenderer.addSeriesRenderer(incomeRenderer);
    multiRenderer.addSeriesRenderer(expenseRenderer);
    multiRenderer.addSeriesRenderer(savingRenderer);

    // Creating an intent to plot bar chart using dataset and multipleRenderer      
    Intent intent = ChartFactory.getBarChartIntent(getBaseContext(), dataset, multiRenderer, Type.DEFAULT);

    // Start Activity
    startActivity(intent);

}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
    // Inflate the menu; this adds items to the action bar if it is present.
    getMenuInflater().inflate(R.menu.main, menu);
    return true;
}

}

Do not forget to add the graph activity in your manifest :-

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="18" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.barchartexample.MainActivity"
        android:label="@string/app_name" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    **<activity android:name="org.achartengine.GraphicalActivity" />**
</application>

It is a working example. Still if you have any query regarding this please feel free to ask. :)