EcomSample - Sample e-commerce Online Shopping App like flipkart, snapdeal, amazon

When ever I used to open any online shopping app, I wanted to know the the mechanism behind loading items, images, data which are not in some limited size. As an Android developer I can understand that many beginners would be thinking to make android app like flipkart, snapdeal or amazon etc. So here is the EcomSample app with complete source code available in github. Sample app is available on PlayStore. 

Download Source Code

Install App 

This app has below features:

1. Loading and caching images with RecyclerView and CardView.
2. Add to Cart and Wishlist, manage cart and wishlist.
3. Category wise items/products loading and caching in list.
4. Detailed item description.
5. All other options available in side Navigation Drawer.
6. Introslider at starting of application.
6. Material design based app.

Screen shots:

  

Note: Please consider the below points

1. The images are downloading from this site: https://www.pexels.com, But you can provide your own server urls to load the image.

2. Item description I have just hard coded only for showcase.

Please feel free to comment for any clarification or suggestion.

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Draw Bar chart in Excel Using jfreechart in Java

If you want to plot bar chart in excel using java then jfreechart is best library under GNU,it 100% free.

We need below jars to work with excel sheet in java: 

1. poi-3.14

2. poi-ooxml-3.14

3. poi-ooxml-schemas-3.14

4. Xmlbeans-2.6

5. Commons-io-2.4

We need below jars to plot chart:

1. Jfreechart

2. Jcommon

3. commons-codec-1.5

4. Commons-digester-1.7

In this example I will only explain to plot doubly bar chart in excel with hardcoded data. You can plot chart by passing data in for loop according to your project requirement. You can see my another post to work with excel here: 

XSSFWorkbook Create CellStyle using POI in java, excel sheet style POI tutorial 

How to plot doubly bar chart in excel in java 

1. Add all the above jar in your projects. 

2. Create separate class for chart operation.

3. Call the methods to plot chart from your own class.

Here I’m giving only code for ChartClass.java

ChartClass.java

import java.awt.Color;

import java.awt.GradientPaint;

import java.io.ByteArrayOutputStream;

import java.io.File;

import java.io.FileOutputStream;

import org.apache.poi.ss.usermodel.ClientAnchor;

import org.apache.poi.ss.usermodel.Workbook;

import org.apache.poi.xssf.usermodel.XSSFClientAnchor;

import org.apache.poi.xssf.usermodel.XSSFDrawing;

import org.apache.poi.xssf.usermodel.XSSFPicture;

import org.apache.poi.xssf.usermodel.XSSFSheet;

import org.apache.poi.xssf.usermodel.XSSFWorkbook;

import org.jfree.chart.ChartFactory;

import org.jfree.chart.ChartUtilities;

import org.jfree.chart.JFreeChart;

import org.jfree.chart.axis.CategoryAxis;

import org.jfree.chart.axis.NumberAxis;

import org.jfree.chart.plot.CategoryPlot;

import org.jfree.chart.plot.PlotOrientation;

import org.jfree.chart.renderer.category.BarRenderer;

import org.jfree.data.category.DefaultCategoryDataset;

public class ChartClass {

public void createDoublyBarChart(XSSFWorkbook workbook,XSSFSheet worksheet) {

// Create Dataset that will take the chart data 

    DefaultCategoryDataset my_bar_chart_dataset = new DefaultCategoryDataset();

        

    // Add data to the data set, make for loop to add data according to your project

    //Here i'm adding only two values for bar

my_bar_chart_dataset.addValue(500,"Benifite","January");

my_bar_chart_dataset.addValue(300,"Investment","January");

my_bar_chart_dataset.addValue(450,"Benifite","February");

my_bar_chart_dataset.addValue(100,"Investment","February");

//Create a logical chart object with the chart data collected 

JFreeChart BarChartObject=ChartFactory.createBarChart("Benifite Vs Investment","Months","Rs(Lakhs)",my_bar_chart_dataset,PlotOrientation.VERTICAL,true,true,false);  

chartSettings(BarChartObject);

//Dimensions of the bar chart               

int width=300;

int height=200; 

/* We don't want to create an intermediate file. So, we create a byte array output stream 

and byte array input stream And we pass the chart data directly to input stream through this              

Write chart as PNG to Output Stream */

try{

ByteArrayOutputStream chart_out = new ByteArrayOutputStream();          

ChartUtilities.writeChartAsPNG(chart_out,BarChartObject,width,height);

//Add PNG to sheet

int my_picture_id = workbook.addPicture(chart_out.toByteArray(), Workbook.PICTURE_TYPE_PNG);

chart_out.close();

// Create the drawing container

XSSFDrawing drawing = worksheet.createDrawingPatriarch();

ClientAnchor my_anchor = new XSSFClientAnchor();

//Define top left corner of chart position, and we can resize picture suitable from there

my_anchor.setCol1(8);

my_anchor.setRow1(14);

/* Invoke createPicture and pass the anchor point and ID */

XSSFPicture  my_picture = drawing.createPicture(my_anchor, my_picture_id);

my_picture.resize(); 

}catch (Exception e) {

// TODO: handle exception

}

}

public void chartSettings(JFreeChart BarChartObject){

//Color changing operation

Color colorLightGray =new Color(224,224,224);

Color colorDarkGray =new Color(158,158,158);

// get a reference to the plot for further customisation...

final CategoryPlot plot = BarChartObject.getCategoryPlot();

plot.setBackgroundPaint(colorLightGray);

plot.setDomainGridlinePaint(Color.white);

plot.setRangeGridlinePaint(colorDarkGray);

//set the range axis to display integers only...

final NumberAxis rangeAxis = (NumberAxis) plot.getRangeAxis();

rangeAxis.setStandardTickUnits(NumberAxis.createIntegerTickUnits());

// disable bar outlines...

final BarRenderer renderer = (BarRenderer) plot.getRenderer();

renderer.setDrawBarOutline(false);

// set up gradient paints for series...

Color colorBlue =new Color(91,155,213);

final GradientPaint gp0 = new GradientPaint(

    0.0f, 0.0f, colorBlue, 

    0.0f, 0.0f, colorBlue

);

Color colorOrange =new Color(237,125,49);

final GradientPaint gp1 = new GradientPaint(

    0.0f, 0.0f, colorOrange, 

    0.0f, 0.0f, colorOrange

);

renderer.setSeriesPaint(0, gp0);

renderer.setSeriesPaint(1, gp1);

CategoryPlot p = BarChartObject.getCategoryPlot(); 

CategoryAxis axis = p.getDomainAxis();

axis.setLowerMargin(0.1);

axis.setUpperMargin(0.1);

//group margin

axis.setCategoryMargin(0.2);

    renderer.setItemMargin(0.05); 

}

}

Add the above code in your project and you run the project.

Please feel free to comment for any clarification or suggestion.

                            ***