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Following Example is about showing a way to write thread that can run in background
and update back to the UI without getting any exception for unresponsiveness UI :



main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    >
<TextView  android:id = "@+id/txtView"
    android:layout_width="fill_parent" 
    android:layout_height="wrap_content" 
    android:text=""
    android:textStyle="bold" android:textSize="50px"
    />
</LinearLayout>

<--- Android Examples





The above screen shows the last digit after incrementing through
0 to 9.


and the Activity code is as follows:
UIThreadExample.java
package com.techienjoy.example;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.TextView;

public class UIThreadExample extends Activity {
    private Handler handler = new Handler();
    TextView txtView;
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        ExampleRunnable runnable = new ExampleRunnable();
        Thread thread = new Thread(null,runnable,"thread");
        thread.start();
        txtView = (TextView) findViewById(R.id.txtView);
    }
    private class ExampleRunnable implements Runnable {
        int j=0;
        @Override
        public void run() {
            
            for(int i=0;i<10;i++) {
                j = i;
                handler.post(new Runnable() {

                    @Override
                    public void run() {
                        txtView.setText(j+"");
                    }
                    
                });
                try {
                    Thread.sleep(1000);
                } catch (InterruptedException e) {
                   
                    e.printStackTrace();
                }
                
            }
            
        }
        
    }
}

<--- Android Examples




Writing a simple SAX Parser using Android Platform :

In the following section I am going to walk you through a simple question on how to write
some example using SAX Parser and URL file reader using Android Platform, and all these
are to be performed in non-UI Thread using AsyncTask class from Android API.

As of writing this page, I have written code for downloading a XML file from the URL 
passed to the class extending AsyncTask class from Android API.

SAXParserExample.java
package com.techienjoy.example;

import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URL;
import java.net.URLConnection;

import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.os.AsyncTask;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class SAXParserExample extends Activity {
    
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final EditText editText= (EditText) findViewById(R.id.edtTxt);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                ConnectivityManager conMgr = (ConnectivityManager) getApplicationContext()
                                                .getSystemService(Context.CONNECTIVITY_SERVICE);
                 if(conMgr != null && conMgr.getActiveNetworkInfo() != null 
                                   && conMgr.getActiveNetworkInfo().isAvailable()) {
                
                ParserHelper parserHelp = new ParserHelper(getApplicationContext());
                parserHelp.execute(editText.getText().toString());
                 } else {
                    Toast.makeText(getApplicationContext(), 
                                   "No Network Connection", Toast.LENGTH_LONG).show(); ;
                }
            }
        });
    }
    private class ParserHelper extends AsyncTask<Object, Integer, Long> {

        private Context context;
        public ParserHelper(Context ctx) {
            context = ctx;
        }
        private Long doWork(Object param) {
            URL url;
            URLConnection ucon = null;

            InputStream din = null;
            int total = 0;
            int count = 0;
            try {
                url = new URL((String) param);
                ucon = url.openConnection();
                din = ucon.getInputStream();
                StringBuffer stb = new StringBuffer();
                
                byte[] bt = new byte[din.available()];
                while((count = din.read(bt)) != -1) {
                   
                    total += count;
                    stb.append(new String(bt));
                    bt = new byte[din.available()];
                    publishProgress(total);
                }

                 InputSource inSource = new InputSource(new StringReader(stb.toString()));
                 SAXParserFactory factory = SAXParserFactory.newInstance();
                 SAXParser saxParser = factory.newSAXParser();
                 saxParser.parse(inSource, new DefaultHandler() {
                   @Override
                   public void characters(char[] ch, int start, int length) {
                     Toast.makeText(context,new String(ch),Toast.LENGTH_LONG).show();
                   }
                 });
 
            } catch (MalformedURLException e) {
                
            } catch (IOException e) {
            }
            
            return new Long(total);
             
        }
        @Override
        protected Long doInBackground(Object... params) {
          return doWork(params[0]);
        }
        @Override
        protected void onProgressUpdate(Integer... progress) {
            Toast.makeText(context, progress[0]+" ", Toast.LENGTH_LONG).show();
        }
        @Override
        protected void onPostExecute(Long result) {
            Toast.makeText(context, result+"  ", Toast.LENGTH_LONG).show();
        }

    }
}

<--- Android Examples




main.xml layout file of this example is as follows:
main.xml
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:background="#FFFFFF"
    >
    <TableLayout android:layout_width="fill_parent"
                 android:layout_height="wrap_content">
        <TableRow android:layout_width="fill_parent"
                  android:layout_height="wrap_content"
                  android:orientation="horizontal">
           <EditText android:id="@+id/edtTxt" android:layout_width="wrap_content"
                  android:layout_height="wrap_content" android:width="200dp">
                  
           </EditText>
           <Button android:id="@+id/button" android:layout_width="wrap_content"
                  android:layout_height="wrap_content" android:text="Show"/>
        </TableRow>
    </TableLayout>
    
</LinearLayout>


<--- Android Examples



In the above code the portion of code marked in pink is doing the parsing 
activity for the XML data read from the URL,
but to my observation, this code is not working and I don't know yet
how to resolve this.

If anyone has any saying on this, please write to me your response
at "techienjoy @ yahoo.com"

Today@ 23rd March 2012: I have managed to code a very simple example using SAX
parser, only one thing is hard-coded, that the XML string is hard-coded in this
example. One can write code to download required XML file and create a XML string
from it. 

SAXParserDemo.java
package com.techienjoy.example;

import java.io.IOException;
import java.io.StringReader;
import java.net.MalformedURLException;

import javax.xml.parsers.ParserConfigurationException;
import javax.xml.parsers.SAXParser;
import javax.xml.parsers.SAXParserFactory;

import org.xml.sax.InputSource;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.DefaultHandler;

import android.app.Activity;
import android.content.Context;
import android.net.ConnectivityManager;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

public class SAXParserDemo extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        final EditText editText= (EditText) findViewById(R.id.edtTxt);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(new OnClickListener() {
            
            @Override
            public void onClick(View v) {
                ConnectivityManager conMgr = (ConnectivityManager) getApplicationContext()
                                                .getSystemService(Context.CONNECTIVITY_SERVICE);
                 if(conMgr != null && conMgr.getActiveNetworkInfo() != null 
                                   && conMgr.getActiveNetworkInfo().isAvailable()) {
                     
                     runOnUiThread(new Runnable(){

                        @Override
                        public void run() {

                            try {
                                StringBuffer stb = new StringBuffer();
                                if(!editText.getText().toString().equals("")) {
                                  stb.append(editText.getText().toString());  
                                } else {
                                  stb.append("<books><title>test</title>" +
                                  		     "<datePublished>2012-03-21</datePublished>" +
                                  		     "</books>");
                                }
                                InputSource inSource = new InputSource(
                                                        new StringReader(stb.toString()));
                                SAXParserFactory factory = SAXParserFactory.newInstance();
                                SAXParser saxParser = factory.newSAXParser();
                                saxParser.parse(inSource, new DefaultHandler() {
                                  @Override
                                  public void characters(char[] ch, int start, int length) {
                                    Toast.makeText(getApplicationContext(),
                                                   new String(ch),Toast.LENGTH_LONG).show();
                                  }
                                });
                                
                            } catch (MalformedURLException e) {
                                
                            } catch (IOException e) {
                            } catch (ParserConfigurationException e) {
                            } catch (SAXException e) {
                            }
                            
                        }
                         
                     });
                 }   
            }
        });
        
    }
}

<--- Android Examples



This above code is going to show TOAST message containing data from the XML string
or value from the tags.

Android API for Bluetooth :
Android Platform supports bluetooth, and so are the related class files 
from Android Platform is going to make interaction with Bluetooth functionality
of the Smartphone real handy.

	android.bluetooth.BluetoothAdapter
class file is providing basic Bluetooth functionalities of the device running
on Android Platform. Some of these tasks are initiate device discovery, querying
and finding list of already paired devices, instantiate a BluetoothDevice using
an address, creates a BluetoothServerSocket for listening to incomming bluetooth
socket connections from other devices.



Android API for Phone Camera :

In the following sections to come I shall try to walk you through an example with source
code whereby I shall be using Camera Android API for doing basic operations, such as 
Camera Preview, Taking Pictures, Doing Face detection from within the picture captured
using Camera hardware present in any Android based Camera Phones.

main.xml - Layout for showing various Android widgets to be laid out:
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent">
    <SurfaceView android:id="@+id/surfaceview" 
                 android:layout_width="200dp" 
                 android:layout_height="200dp"/>
    <TextView android:id="@+id/numfaces" 
              android:background="#FFFFFF" 
              android:layout_width="30dp" 
              android:layout_height="30dp"/>
    <Button android:id="@+id/stopbutton" 
            android:text="Stop Preview" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"/>
    <Button android:id="@+id/startbutton" 
            android:text="Start Preview" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"/>
    <Button android:id="@+id/picbutton" 
            android:text="Take Picture" 
            android:layout_width="wrap_content" 
            android:layout_height="wrap_content"/>    
</LinearLayout>

<--- Android Examples




CapturePreviewImage.java
/**
* This code is provided "AS IS" without any
* thorough testing on real devices. If you are going to use it, 
* use it at your own risk.
* Contact Author in case willing to contribute: 
* reaching @ techienjoy . com 
* Copyright: 17th-Feb-2012
*/
package com.techienjoy.example;

import java.io.IOException;

import android.app.Activity;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.hardware.Camera;
import android.hardware.Camera.Size;
import android.media.FaceDetector;
import android.media.FaceDetector.Face;
import android.os.Bundle;
import android.view.SurfaceHolder;
import android.view.SurfaceView;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;

public class CapturePreviewImage extends Activity implements 
                                              SurfaceHolder.Callback {
    private Camera camera;
    private TextView txtView;

    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        txtView = (TextView) findViewById(R.id.numfaces);
        SurfaceView surfaceView = (SurfaceView) findViewById(R.id.surfaceview);
        SurfaceHolder surfaceHolder = surfaceView.getHolder();
        surfaceHolder.addCallback(this);
        surfaceHolder.setType(SurfaceHolder.SURFACE_TYPE_PUSH_BUFFERS);
        surfaceHolder.setFixedSize(200, 200); //hard coded
        Button button = (Button) findViewById(R.id.stopbutton);
        button.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                camera.stopPreview();

            }
        });
        Button button1 = (Button) findViewById(R.id.startbutton);
        button1.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                camera.startPreview();

            }
        });

        Button button2 = (Button) findViewById(R.id.picbutton);
        button2.setOnClickListener(new View.OnClickListener() {
            
            @Override
            public void onClick(View v) {
                camera.takePicture(new CustomShutter(), null, 
                                              new CustomPictureCallback());

            }
        });

    }

    @Override
    public void surfaceChanged(SurfaceHolder holder, int format, int width,
            int height) {
    }

    @Override
    public void surfaceCreated(SurfaceHolder holder) {
        try {
            camera = Camera.open();
            camera.setPreviewDisplay(holder);
            
            camera.startPreview();
            
        } catch (IOException e) {
           
            e.printStackTrace();
        }
        
    }

    @Override
    public void surfaceDestroyed(SurfaceHolder holder) {
    }
    class CustomPictureCallback implements Camera.PictureCallback {
        private Bitmap bitmap;
        @Override
        public void onPictureTaken(byte[] data, Camera camera) {
            Size previewSize = camera.getParameters().getPictureSize();
            bitmap = BitmapFactory.decodeByteArray(data, 0, data.length);
            
            if(bitmap != null) {
           
            FaceDetector faceDetector = 
                   new FaceDetector(previewSize.width, previewSize.height, 2);
            Face[] faces = new Face[2];
            int facesNum = faceDetector.findFaces(bitmap, faces);
            txtView.setText(""+facesNum);
            } else {
             txtView.setText("0");
            }
            
        }
        
    }
    class CustomShutter implements Camera.ShutterCallback {

        @Override
        public void onShutter() {
            
        }
        
    }
    @Override
    public void onDestroy() {
        super.onDestroy();
        if(camera != null) {
            camera.release();
        }
    }
 }
<--- Android Examples




This is the main Activity that has code for controlling Camera previews,
taking pictures and its related callbacks, camera shutter callbacks etc.

In order to assemble and make this example run using Eclipse with Android Plugin,
following steps would come handy I guess:

1. Create a project of Android Project type.
2. By using above code appropriately and building the final deployable *.apk file
   under bin folder, one can test it either by using Android Emulator or a real 
   device/phone using Android Platform.

Examples on Android Platform:

Layout using Android Platform.
Example on Layout using Android Platform 
with source code.

Gallery Surfaceview Usage
Android Gallery Surfaceview Example
with source code discussed.

Text to speech example
Android Text to speech example
with source code for reference.

Application on Android Platform

Article Dated : 12 December 2011 : 
Expandable List Example on Android Platform

Article Dated : 17 December 2011 : 
Dynamically creating List Example on Android Platform

Article Dated : 19 December 2011 : 
Dynamically creating ExpandableListView Example on Android Platform

Article Dated : 21 December 2011 : 
ListView Example on Android Platform

Article Dated : 23 December 2011 : 
Hardware sensors on Android Platform

Article Dated : 26 December 2011 : 
Customized ListView on Android Platform

Article Dated : 27 December 2011 : 
Customized TabActivity on Android Platform

Article Dated : 28 December 2011 : 
Gallery Widget and ImageView example on Android Platform
   
Article Dated : 29 December 2011 : 
Gallery Widget and ImageView example Enhanced on Android Platform
   
Article Dated : 01 January 2012 : 
File and Folder Explorer designed using Android API

Article Dated : 08 January 2012 : 
DatePickerDialog from Android API

Article Dated : 10 January 2012 : 
TimePickerDialog from Android API
This is an example showing
a simple way to use 
TimePickerWidget from Android API.

Example using Intents from Android Platform
using a Broadcast and Receiver Example

Grids on Android Platform

Example using Canvas for drawing multiple shapes
and using touch event listener as well.

Internal memory on Android Platform

Example using Custom View using Android Platform
and source code implementing this example.

Example on using Android Data Example.

Example using ImageButton using Android Platform
and source code implementing this example.

Android Smartphone list.

Projects Batch on Android Platform

Example using View LayoutParams using Android Platform
and source code implementing this example.

Example using RelativeLayout using Android Platform
and source code implementing this example.

Example on Android Sensors Listed and
explained with a very simple scenario 
and article with appropriate screens 
captured and shown.

Using Intent to send a notification 
on receiving an Intent on Android Platform

Example using GridView Widget using Android Platform
and source code implementing this example.

Example using GWT and some design patterns and various
ways of implementing this example.

Example on Android ListView 
explained with a very simple scenario
whereby showing folder and files with
structure and appropriate screens 
captured and shown.

Example using Borots using Android Platform
and source code implementing this example.

Example on using Android and SQL Example.

Example using NFC using Android Platform
and source code implementing this example.

Android Smartphone online.

Example using Custom Wizard Framework 
with code and explained

Log4j example with source code on Java Platform.

Clouds Projects on Android Platform

Example using EditText using Android Platform
and source code implementing this example.

Example on Android List View
explained with a very simple scenario 
and article with appropriate screens 
captured and shown.

Example on using different log files 
using Apache Log4j Framework.

Example using Customized Android Platform
and source code implementing this example.

Projects Development on Android Platform

Example on Android DatePickerDialog
explained with a very simple scenario
and appropriate screens captured and shown.

Example using a hyperlinked Text using Android TextView

Example using Draw using Android Platform
and source code implementing this example.

Example using span for creating 
a hyperlinked Text using Android TextView

Tech related discussion on Android Technology

Example on Android Gallery View
explained with a very simple scenario
and appropriate screens captured and shown.

Questions on Android Platform

Example on using Android Preferences.

Example using ViewGroup using Android Platform
and source code implementing this example.

JSF Validation with example with source code 
on Java Platform.

Example using Load test functionalities 
with code and explained

Answers of Questions on Android Platform

User Interface on Android Platform

Android Smartphone reviews.

Android Smartphone guide.

ESB Interview Questions Answer

JSF example of Tags and checkboxes 
with source code on Java Platform.

Example of using Mule ESB JMS Transport with simple
to explain source code.

Android Service details

Example on using Android Data Access.

Example using Intent from Android Platform
and source code implementing this example.

Tests on Android Platform

Android Smartphone OS.

Performance on Android Platform

Example on using DOJO Dialog
explained with a very simple scenario

Example on using Android Database.

Android Smartphone apps.

Android Smartphone comparison.

List of Interview Questions and answer on Android Technology

JSF example with source code on Java Platform.

Example using UI Thread for animating multiple images
in a sequence of flow.

Example on using Expandable ListView
on Android Platform.A step by step source code
explained.

Example using Canvas using Android Platform
and source code implementing this example.

Example on using DOJO Tree Widget
explained with a very simple scenario

Processes on Android Platform

Android Example on using Text
2 Speech conversion explained with
source code Explained.

Projects Benchmark on Android Platform

Example on using Android Content Provider.

List of Examples on Various Technologies and Frameworks.

Example using Orientation Sensor using Android Platform
and source code implementing this example.

Example using Menu and MenuItem using Android Platform 
with code and explained

Example on Android ListView and
explained with a very simple scenario 
and article with appropriate screens 
captured and shown.

JSF example of Resource Bundle with source code 
on Java Platform.

Designs on Android Platform

Example on using Android Shared Preferences.

Architectures on Android Platform

List of ANDROid examples
with source code and output
screens captured and shown.

Example using Apache commons log 
with code and explained

Example on using Android SQLLite Example.

Security Features on Android Platform

Example on how to use Quartz Scheduler.

Interfaces on Android Platform

Example on using Android ListView with Click Event.

Encryption Features on Android Platform

Example using ViewFlipper for animating multiple images
in a sequence of flow by appropriate flippering.

Students Projects on Android Platform

Example on Android Tab View
explained with a very simple scenario
and appropriate screens captured and shown.

Example using Images and Gradient Shape using
Android Platform.

Example using Spinner using Android Platform
and source code implementing this example.

Example using ImageButton and customized to show
a different view altogether and source code implementing
this example.

A short write-up on JDBC Transaction
Isolation showing ways to achieve
various Isolation levels using JDBC.

Example on ways to download any file with
any format using Android Platform.

Deploy Projects on Android Platform

JSF example of Tags and SelectBoxes 
with source code on Java Platform.

Example using Animation using Android Platform
and source code implementing this example.

Example on using Android SQLite Example.

Example on using ImageView using 
Android Platform. A very simple to setup
and see it working.

Example showing Android Gallery
with SurfaceView and Spinner

Example of using Mule ESB File Transport with simple
to explain source code.

List of Interview Questions and answer on Apache Log4j

Testers on Android Platform

Example using WebView using Android Platform
and source code implementing this example.

Example using AlertDialog from Android Platform
and source code implementing this example.

Example on using Expandable ListView
on Android Platform.A step by step source code
explained.

Android Example on using Layout
with source code Explained.

Interview Questions on Android Platform

Debug Projects on Android Platform

JSF example of Tags and Code Walk-through 
with source code on Java Platform.

Android Smartphone features.

Example on Android TimePickerDialog
explained with a very simple scenario
and appropriate screens captured and shown.

Students Projects Developers on Android Platform

Example using Cartoon using Android Platform
and source code implementing this example.

Example on Android Gallery View
explained with a very simple scenario
and appropriate screens captured and shown.

Android Smartphone Note.

Example on using Android Storage.

Log4j example with source code on Java Platform.

Example using Views using Android Platform
and source code implementing this example.

JSF example of Tags and Data Table 
with source code on Java Platform.

Example on how to code and use
Custom Tag Library on Java Platform.

Interview on Android Platform

Example on using Android and DDL Example.

Example using Drawing using Android Platform
and source code implementing this example.

Example using Intents from Android Platform
using a Broadcast Example

Example using Bluetooth using Android Platform
and source code implementing this example.

Tags: TabHost and TabActivity Example on Android Platform
Tags: ListView Example on Android Platform
Tags: android sensors list
Tags: android listview example
Tags: android imageview example
Tags: Android example download any file sourcecode
Tags: android expandable list dynamically created example
Tags: android expandable list example
Tags: Android Gallery surfaceviews spinner
Tags: Android example download any file sourcecode
Tags: Android Layout Example
Tags: Android Text To Speech Example

Tags: DOJO Example Dialog
Tags: DOJO Example Tree Widget
Tags: different logger file log4j
Tags: JDBC Transaction isolation
Tags: event handling java code
Tags: example quartz scheduler
Tags: example tag library web application
Tags: Flex
Tags: index
Tags: inmemory image creation java awt
Tags: JSF Example Main
Tags: JSF Example Tags CheckBoxes
Tags: JSF Example Tags dataTable
Tags: JSF Example Tags SelectBoxes
Tags: JSF Example Tags Walkthrough
Tags: JSF Example Validation
Tags: JSF Resource Bundle
Tags: log4j example 1
Tags: log4j example
Tags: Miscellaneous
Tags: Mule ESB File Transport
Tags: Mule ESB JMS Transport
Tags: stream download batch
Tags: sychronized block wait notify
Tags: thread wait notify example
Tags: using apache commons log
Tags: web load test
Tags: Wizard Framework Idea Java

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