Android Beginners

Reading a pdf file

2012-05-24T11:31:00.000-07:00

Here we are try to read a pdf file with help of iText . You can download the iText binary from http://sourceforge.net/projects/itext/.

import java.io.FileOutputStream;
import java.io.IOException;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Image;
import com.itextpdf.text.pdf.PdfImportedPage;
import com.itextpdf.text.pdf.PdfReader;
import com.itextpdf.text.pdf.PdfWriter;
public class ReadAndUsePdf {
private static String INPUTFILE = "c:/temp/FirstPdf.pdf";
private static String OUTPUTFILE = "c:/temp/ReadPdf.pdf";
public static void main(String[] args) throws DocumentException,
IOException {
Document document = new Document();
PdfWriter writer = PdfWriter.getInstance(document,
new FileOutputStream(OUTPUTFILE));
document.open();
PdfReader reader = new PdfReader(INPUTFILE);
int n = reader.getNumberOfPages();
PdfImportedPage page;
// Go through all pages
for (int i = 1; i <= n; i++) {
// Only page number 2 will be included
if (i == 2) {
page = writer.getImportedPage(reader, i);
Image instance = Image.getInstance(page);
document.add(instance);
}
}
document.close();
}
}

Creating a pdf in Android with help of iText

2012-05-24T11:27:00.000-07:00

With help of iText we can create a pdf file. you can download the latest binary from http://sourceforge.net/projects/itext/.

import java.io.FileOutputStream;
import java.util.Date;

import com.itextpdf.text.Anchor;
import com.itextpdf.text.BadElementException;
import com.itextpdf.text.BaseColor;
import com.itextpdf.text.Chapter;
import com.itextpdf.text.Document;
import com.itextpdf.text.DocumentException;
import com.itextpdf.text.Element;
import com.itextpdf.text.Font;
import com.itextpdf.text.List;
import com.itextpdf.text.ListItem;
import com.itextpdf.text.Paragraph;
import com.itextpdf.text.Phrase;
import com.itextpdf.text.Section;
import com.itextpdf.text.pdf.PdfPCell;
import com.itextpdf.text.pdf.PdfPTable;
import com.itextpdf.text.pdf.PdfWriter;


public class FirstPdf {
 private static String FILE = "c:/temp/FirstPdf.pdf";
 private static Font catFont = new Font(Font.FontFamily.TIMES_ROMAN, 18,
   Font.BOLD);
 private static Font redFont = new Font(Font.FontFamily.TIMES_ROMAN, 12,
   Font.NORMAL, BaseColor.RED);
 private static Font subFont = new Font(Font.FontFamily.TIMES_ROMAN, 16,
   Font.BOLD);
 private static Font smallBold = new Font(Font.FontFamily.TIMES_ROMAN, 12,
   Font.BOLD);

 public static void main(String[] args) {
  try {
   Document document = new Document();
   PdfWriter.getInstance(document, new FileOutputStream(FILE));
   document.open();
   addMetaData(document);
   addTitlePage(document);
   addContent(document);
   document.close();
  } catch (Exception e) {
   e.printStackTrace();
  }
 }

 // iText allows to add metadata to the PDF which can be viewed in your Adobe
 // Reader
 // under File -> Properties
 private static void addMetaData(Document document) {
  document.addTitle("My first PDF");
  document.addSubject("Using iText");
  document.addKeywords("Java, PDF, iText");
  document.addAuthor("Lars Vogel");
  document.addCreator("Lars Vogel");
 }

 private static void addTitlePage(Document document)
   throws DocumentException {
  Paragraph preface = new Paragraph();
  // We add one empty line
  addEmptyLine(preface, 1);
  // Lets write a big header
  preface.add(new Paragraph("Title of the document", catFont));

  addEmptyLine(preface, 1);
  // Will create: Report generated by: _name, _date
  preface.add(new Paragraph(
    "Report generated by: " + System.getProperty("user.name") + ", " + new Date(), //$NON-NLS-1$ //$NON-NLS-2$ //$NON-NLS-3$
    smallBold));
  addEmptyLine(preface, 3);
  preface.add(new Paragraph(
    "This document describes something which is very important ",
    smallBold));

  addEmptyLine(preface, 8);

  preface.add(new Paragraph(
    "This document is a preliminary version and not subject to your license agreement or any other agreement with vogella.com ;-).",
    redFont));

  document.add(preface);
  // Start a new page
  document.newPage();
 }

 private static void addContent(Document document) throws DocumentException {
  Anchor anchor = new Anchor("First Chapter", catFont);
  anchor.setName("First Chapter");

  // Second parameter is the number of the chapter
  Chapter catPart = new Chapter(new Paragraph(anchor), 1);

  Paragraph subPara = new Paragraph("Subcategory 1", subFont);
  Section subCatPart = catPart.addSection(subPara);
  subCatPart.add(new Paragraph("Hello"));

  subPara = new Paragraph("Subcategory 2", subFont);
  subCatPart = catPart.addSection(subPara);
  subCatPart.add(new Paragraph("Paragraph 1"));
  subCatPart.add(new Paragraph("Paragraph 2"));
  subCatPart.add(new Paragraph("Paragraph 3"));

  // Add a list
  createList(subCatPart);
  Paragraph paragraph = new Paragraph();
  addEmptyLine(paragraph, 5);
  subCatPart.add(paragraph);

  // Add a table
  createTable(subCatPart);

  // Now add all this to the document
  document.add(catPart);

  // Next section
  anchor = new Anchor("Second Chapter", catFont);
  anchor.setName("Second Chapter");

  // Second parameter is the number of the chapter
  catPart = new Chapter(new Paragraph(anchor), 1);

  subPara = new Paragraph("Subcategory", subFont);
  subCatPart = catPart.addSection(subPara);
  subCatPart.add(new Paragraph("This is a very important message"));

  // Now add all this to the document
  document.add(catPart);

 }

 private static void createTable(Section subCatPart)
   throws BadElementException {
  PdfPTable table = new PdfPTable(3);

  // t.setBorderColor(BaseColor.GRAY);
  // t.setPadding(4);
  // t.setSpacing(4);
  // t.setBorderWidth(1);

  PdfPCell c1 = new PdfPCell(new Phrase("Table Header 1"));
  c1.setHorizontalAlignment(Element.ALIGN_CENTER);
  table.addCell(c1);

  c1 = new PdfPCell(new Phrase("Table Header 2"));
  c1.setHorizontalAlignment(Element.ALIGN_CENTER);
  table.addCell(c1);

  c1 = new PdfPCell(new Phrase("Table Header 3"));
  c1.setHorizontalAlignment(Element.ALIGN_CENTER);
  table.addCell(c1);
  table.setHeaderRows(1);

  table.addCell("1.0");
  table.addCell("1.1");
  table.addCell("1.2");
  table.addCell("2.1");
  table.addCell("2.2");
  table.addCell("2.3");

  subCatPart.add(table);

 }

 private static void createList(Section subCatPart) {
  List list = new List(true, false, 10);
  list.add(new ListItem("First point"));
  list.add(new ListItem("Second point"));
  list.add(new ListItem("Third point"));
  subCatPart.add(list);
 }

 private static void addEmptyLine(Paragraph paragraph, int number) {
  for (int i = 0; i < number; i++) {
   paragraph.add(new Paragraph(" "));
  }
 }
}

Adding LayoutParams

2011-02-21T01:47:00.000-08:00

Adding the LayoutParams to the control

LinearLayout.LayoutParams params=new LinearLayout.LayoutParams(
   LayoutParams.FILL_PARENT,
   LayoutParams.WRAP_CONTENT);
    params.leftMargin=22;
params.height=20;
params.width=10;

Creating dynamic controls.

2011-02-21T01:43:00.000-08:00

Here is the code for dynamically creating controls in the table layout...
TableLayout tl=(TableLayout)findViewById(R.id.NewsTable);
for (int i = 0; i < 16; i++)
{
TableRow tr=new TableRow(this);
TextView TV=new TextView(this);
TV.setText("Dynamic Button--"+i);
ImageView IV=new ImageView(this);
Uri imgUri=Uri.parse("android.resource://com.example.hello/"+R.drawable.icon);
IV.setImageURI(imgUri);
tr.addView(IV);
tr.addView(TV);
tl.addView(tr);

Get Phone Contact Details

2010-01-28T08:48:00.000-08:00

private void getMyPhoneNumber(){
        // Form an array specifying which columns to return.
        try{

        String[] projection = new String[] {
                                     People._ID,
                                     People.LABEL,//._COUNT,
                                     People.NAME,
                                     People.NUMBER,
                                     People.PRIMARY_EMAIL_ID
                                  };

        // Get the base URI for the People table in the Contacts content provider.
        Uri contacts = People.CONTENT_URI;

        // Make the query.
        Cursor managedCursor = managedQuery(contacts,
                                projection, // Which columns to return
                                 null,       // Which rows to return (all rows)
                                 null,       // Selection arguments (none)
                                 // Put the results in ascending order by name
                                 People.NAME + " ASC");

        alertbox("Contacts", getColumnData(managedCursor));
        }
        catch(Exception e){
            alertbox("Exception", e.getMessage());
        }

    }

private String getColumnData(Cursor cur){
        String ContactsName="";
        if (cur.moveToFirst()) {

            String name;
            String phoneNumber;
            String email;
            String Label;
            int nameColumn = cur.getColumnIndex(People.NAME);
            int phoneColumn = cur.getColumnIndex(People.NUMBER);

            String imagePath;

            do {
                // Get the field values
                name = cur.getString(nameColumn);
                phoneNumber = cur.getString(phoneColumn);
                 email =cur.getString(cur.getColumnIndex(People.PRIMARY_EMAIL_ID));
                 Label =cur.getString(cur.getColumnIndex(People.LABEL));
                ContactsName+="name:"+name+" Phoneno:"+phoneNumber+"email:"+email+"label:"+Label;

            } while (cur.moveToNext());

        }
        return ContactsName;
    }

Alert box in Android

2010-01-15T11:59:00.000-08:00

As as java script we show a alert dailoge box.

Java Code:

    protected void alertbox(String title, String mymessage)
        {
        new AlertDialog.Builder(this)
           .setMessage(mymessage)
          .setTitle(title)
           .setCancelable(true)
           .setNeutralButton(android.R.string.cancel,
              new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog, int whichButton){}
              })
           .show();
        }

Communication with HttpRequest

2010-01-15T11:29:00.000-08:00

Get data from server with help of http request and get the response.

Java file:

package com.example.HttpExample;
import java.io.BufferedInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.util.ArrayList;
import java.util.List;

import org.apache.http.HttpResponse;
import org.apache.http.NameValuePair;
import org.apache.http.client.ClientProtocolException;
import org.apache.http.client.HttpClient;
import org.apache.http.client.entity.UrlEncodedFormEntity;
import org.apache.http.client.methods.HttpPost;
import org.apache.http.impl.client.DefaultHttpClient;
import org.apache.http.message.BasicNameValuePair;
import org.apache.http.protocol.HTTP;
import org.apache.http.util.ByteArrayBuffer;

import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.TextView;

public class HttpExample extends Activity {
    /** Called when the activity is first created. */
    String url = "http://techy.limewebs.com/data.php";
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);


   TextView tv=new TextView(this);
   tv.setText("Android !!!!!!!!!!!!");
   Button myButton = (Button) findViewById(R.id.button);
   myButton.setOnClickListener(new OnClickListener() {

    public void onClick(View v) {
        // TODO Auto-generated method stub
        btn_Click();
    }}
);
// setContentView(tv);

    }
    public void btn_Click(){
        //alertbox("My Alert","U click Me");
        SendHttpRequset();


    }
    protected void alertbox(String title, String mymessage)
        {
        new AlertDialog.Builder(this)
           .setMessage(mymessage)
          .setTitle(title)
           .setCancelable(true)
           .setNeutralButton(android.R.string.cancel,
              new DialogInterface.OnClickListener() {
              public void onClick(DialogInterface dialog, int whichButton){}
              })
           .show();
        }

    private void SendHttpRequset(){

        try {
               HttpClient httpclient = new DefaultHttpClient();
               HttpPost httppost = new HttpPost(url);


               List nameValuePairs = new ArrayList();
               nameValuePairs.add(new BasicNameValuePair("data", "Atul Yadav"));
               httppost.setEntity(new UrlEncodedFormEntity(nameValuePairs,HTTP.UTF_8));

               // Execute HTTP Post Request
               HttpResponse response = httpclient.execute(httppost);

               InputStream is = response.getEntity().getContent();
               BufferedInputStream bis = new BufferedInputStream(is);
               ByteArrayBuffer baf = new ByteArrayBuffer(20);

                int current = 0;
                while((current = bis.read()) != -1){
                    baf.append((byte)current);
                }

               /* Convert the Bytes read to a String. */
                TextView lbl = (TextView) findViewById(R.id.ShowResponce);
                String text = new String(baf.toByteArray());
                lbl.setText(text);


            } catch (ClientProtocolException e) {
                // TODO Auto-generated catch block
                TextView lbl = (TextView) findViewById(R.id.ShowResponce);
                lbl.setText(e.getMessage());

           } catch (IOException e) {
                // TODO Auto-generated catch block
                TextView lbl = (TextView) findViewById(R.id.ShowResponce);
                lbl.setText(e.getMessage());

           }
            }

}

Layout :

Main.xml

What is Android

2010-01-13T12:37:00.000-08:00

Android is a mobile operating system running on the Linux kernel. It was initially developed by Android Inc., a firm later purchased by Google, and lately by the Open Handset Alliance. It allows developers to write managed code in the Java language, controlling the device via Google-developed Java libraries.
The unveiling of the Android distribution on 5 November 2007 was announced with the founding of the Open Handset Alliance, a consortium of hardware, software, and telecom companies devoted to advancing open standards for mobile devices.Google released most of the Android code under the Apache License, a free software and open source license.

Features

Handset layouts	The platform is adaptable to larger, VGA, 2D graphics library, 3D graphics library based on OpenGL ES 1.0 specifications, and traditional smartphone layouts.
Storage	The Database Software SQLite is used for data storage purposes
Connectivity	Android supports connectivity technologies including GSM/EDGE, CDMA, EV-DO, UMTS, Bluetooth, and Wi-Fi.
Messaging	SMS and MMS are available forms of messaging including threaded text messaging.
Web browser	The web browser available in Android is based on the open-source WebKit application framework. The browser scores a 93/100 on the Acid3 Test.
Java support	Software written in Java can be compiled to be executed in the Dalvik virtual machine, which is a specialized VM implementation designed for mobile device use, although not technically a standard Java Virtual Machine.

Additional hardware support	Android can use video/still cameras, touchscreens, GPS, accelerometers, magnetometers, accelerated 2D bit blits (with hardware orientation, scaling, pixel format conversion) and accelerated 3D graphics.
Development environment	Includes a device emulator, tools for debugging, memory and performance profiling, a plugin for the Eclipse IDE.
Market	Like many phone-based application stores, the Android Market The Android Market has been expanding rapidly. By December, 2009, it had over 20,000 Android applications for download. is a catalog of applications that can be downloaded and installed to target hardware over-the-air, without the use of a PC. Originally only freeware applications were supported. Paid-for apps have been available on the Android Market in the United States since 19 February 2009.
Multi-touch	Android has native support for multi-touch which is available in newer handsets such as the HTC Hero. The feature was initially disabled at the kernel level (possibly to avoid infringing Apple patents on touch-screen technology).