AsyncTask Android example | AsyncTask in Android

In this tutorial you will learn how to use AsyncTask in your application. This AsyncTask class perform background operations and update the results on the UI

AsyncTask has three generic type

• Params, the type of the parameters sent to the task upon execution.
• Progress, the type of the progress units published during the background computation.
• Result, the type of the result of the background computation

Private class ShowDialogAsyncTask extends 
        AsyncTask<Params, Progress, Result>{....}

AsyncTask goes through 4 steps

• onPreExecute(),invoked on the UI thread immediately after the task is executed.
•  doInBackground(Paaram ...),invoked on the background thread immediately after onPreExecute() finishes executing.
• onProgressUpdate(Progress...) invoked on the UI thread after a call to publishProgress(Progress...).
•  onPostExecute(Result), invoked on the UI thread after the background computation finishes. 

AsyncTaskActivity

package com.javasrilankansupport.asynctask;

import android.os.AsyncTask;
import android.os.Bundle;
import android.os.SystemClock;
import android.app.Activity;
import android.view.View;
import android.widget.Button;
import android.widget.ProgressBar;
import android.widget.TextView;
import android.widget.Toast;


public class AsyncTaskActivity extends Activity {

 Button btn_start;
 ProgressBar progressBar;
 TextView txt_percentage;
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_async_task);
        
        btn_start = (Button) findViewById(R.id.btn_start);
        progressBar =  (ProgressBar) findViewById(R.id.progress);
        txt_percentage= (TextView) findViewById(R.id.txt_percentage);
        
        btn_start.setOnClickListener(new View.OnClickListener() {
   
   @Override
   public void onClick(View v) {
    
    btn_start.setEnabled(false);
    new ShowDialogAsyncTask().execute();
   }
  });
    }

    
    private class ShowDialogAsyncTask extends AsyncTask<Void, Integer, Void>{

     int progress_status;
     
     @Override
  protected void onPreExecute() {
   // update the UI immediately after the task is executed
   super.onPreExecute();
   
    Toast.makeText(AsyncTaskActivity.this,
            "Invoke onPreExecute()", Toast.LENGTH_SHORT).show();

    progress_status = 0;
    txt_percentage.setText("downloading 0%");
   
  }
     
  @Override
  protected Void doInBackground(Void... params) {
   
   while(progress_status<100){
    
    progress_status += 2;
    
    publishProgress(progress_status);
    SystemClock.sleep(300);
    
   }
   return null;
  }
 
  @Override
  protected void onProgressUpdate(Integer... values) {
   super.onProgressUpdate(values);
   
   progressBar.setProgress(values[0]);
   txt_percentage.setText("downloading " +values[0]+"%");
   
  }
  
  @Override
  protected void onPostExecute(Void result) {
   super.onPostExecute(result);
   
    Toast.makeText(AsyncTaskActivity.this,
            "Invoke onPostExecute()", Toast.LENGTH_SHORT).show();
    
    txt_percentage.setText("download complete");
    btn_start.setEnabled(true);
  }
    }
}

activity_async_task.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:padding="@dimen/padding_medium"
        android:text="@string/async_task"
        tools:context=".AsyncTaskActivity" />

    <ProgressBar
        android:id="@+id/progress"
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/textView1"
        android:layout_marginTop="34dp" />

    <Button
        android:id="@+id/btn_start"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_below="@+id/progress"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="40dp"
        android:minWidth="120dp"
        android:text="@string/start_btn" />

    <TextView
        android:id="@+id/txt_percentage"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_below="@+id/progress"
        android:text="downloading  0%"
        android:textAppearance="?android:attr/textAppearanceMedium" />

</RelativeLayout>

Download AsyncTask Android example

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Android Dialog - Android Custom Dialog

In this tutorial I am going to describe how to create Android Custom Dialg which is for user login, you may have any customized android layout.

Android Dialog

 Create Android Project  AndroidDialog ;  File -> New -> Android Project

Android Layout

activity_android_dialog.xml

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >

    <Button
        android:id="@+id/btn_launch"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentTop="true"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="115dp"
        android:text="Launch Dialog" />

    <TextView
        android:id="@+id/textView1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentTop="true"
        android:layout_marginLeft="28dp"
        android:layout_marginTop="54dp"
        android:text="@string/app_desc"
        android:textAppearance="?android:attr/textAppearanceLarge" />
    
</RelativeLayout>

Dialog Layout

dialog_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical"
    android:padding="10sp" >

    <EditText
        android:id="@+id/txt_name"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content"
        android:hint="@string/dialog_uname"
        android:singleLine="true" >

        <requestFocus />
    </EditText>

    <EditText
        android:id="@+id/password"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:ems="10"
        android:inputType="textPassword" >
    </EditText>

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content" >

        <Button
            android:id="@+id/btn_login"
            android:layout_width="120dp"
            android:layout_height="wrap_content"
            android:text="@string/dialog_submit" />

        <Button
            android:id="@+id/btn_cancel"
            android:layout_width="120dp"
            android:layout_height="wrap_content"
            android:layout_alignParentTop="true"
            android:layout_marginLeft="10dp"
            android:layout_toRightOf="@+id/btn_login"
            android:text="@string/dialog_cancel" />
    </RelativeLayout>

</LinearLayout>

AndroidDialog   Activity

Override both onCreateDialog(int id) and onPrepareDialog(int id, Dialog dialog) methods and add following code which will create your custom Android Dialog.

import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.Dialog;

public class AndroidDialog extends Activity {

 final private static int DIALOG_LOGIN = 1;

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.activity_android_dialog);

  Button launch_button = (Button) findViewById(R.id.btn_launch);

  launch_button.setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View v) {
    showDialog(DIALOG_LOGIN);
   }
  });
 }

 @Override
 protected Dialog onCreateDialog(int id) {

  AlertDialog dialogDetails = null;

  switch (id) {
  case DIALOG_LOGIN:
   LayoutInflater inflater = LayoutInflater.from(this);
   View dialogview = inflater.inflate(R.layout.dialog_layout, null);

   AlertDialog.Builder dialogbuilder = new AlertDialog.Builder(this);
   dialogbuilder.setTitle("Login");
   dialogbuilder.setView(dialogview);
   dialogDetails = dialogbuilder.create();

   break;
  }

  return dialogDetails;
 }

 @Override
 protected void onPrepareDialog(int id, Dialog dialog) {

  switch (id) {
  case DIALOG_LOGIN:
   final AlertDialog alertDialog = (AlertDialog) dialog;
   Button loginbutton = (Button) alertDialog
     .findViewById(R.id.btn_login);
   Button cancelbutton = (Button) alertDialog
     .findViewById(R.id.btn_cancel);
   final EditText userName = (EditText) alertDialog
     .findViewById(R.id.txt_name);
   final EditText password = (EditText) alertDialog
     .findViewById(R.id.password);

   loginbutton.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
     alertDialog.dismiss();
     Toast.makeText(
       AndroidDialog.this,
       "User Name : " + userName.getText().toString()
         + "  Password : "
         + password.getText().toString(),
       Toast.LENGTH_LONG).show();
    }
   });

   cancelbutton.setOnClickListener(new View.OnClickListener() {

    @Override
    public void onClick(View v) {
     alertDialog.dismiss();
    }
   });
   break;
  }
 }
}

Download Android Custom Dialog Eclipse project 

Read more...

How to Check Android Network / Internet Connectivity Status

It is not complex to Check Android Network / Internet Connectivity Status, bellow DetectConnection class
will help you to check Android Network / Internet Connectivity Status. Here I am going to load Android Wireless & Network Setting if device is not connected to any Network.

• Create an Android project called CheckConnection , visit my previous post  First Android Application in Eclipse Hello world Android Example

CheckConnectionActivity Activity will load Wireless & Network Setting if your Android device is not connected to the Network.

package com.jsupport;

import android.os.Bundle;
import android.provider.Settings;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import android.app.Activity;
import android.content.Intent;

public class CheckConnectionActivity extends Activity {

 @Override
 public void onCreate(Bundle savedInstanceState) {
  super.onCreate(savedInstanceState);
  setContentView(R.layout.check_connection);

  Button check_connection = (Button) findViewById(R.id.btn_checkConnection);

  check_connection.setOnClickListener(new View.OnClickListener() {

   @Override
   public void onClick(View v) {
    if (DetectConnection
      .checkInternetConnection(CheckConnectionActivity.this)) {
     Toast.makeText(CheckConnectionActivity.this,
       "You have Internet Connection", Toast.LENGTH_LONG)
       .show();
    } else {
     Toast.makeText(CheckConnectionActivity.this,
       "You Do not have Internet Connection",
       Toast.LENGTH_LONG).show();

     CheckConnectionActivity.this.startActivity(new Intent(
       Settings.ACTION_WIRELESS_SETTINGS));
    }
   }
  });
 }
}

Create DetectConnection class

Context.getSystemService(Context.CONNECTIVITY_SERVICE)

which will gives the Network information, network availability and the connectivity status of the device

package com.jsupport;

package com.jsupport;

import android.content.Context;
import android.net.ConnectivityManager;

public class DetectConnection {

 public static boolean checkInternetConnection(Context context) {

  ConnectivityManager con_manager = (ConnectivityManager) context
    .getSystemService(Context.CONNECTIVITY_SERVICE);

  if (con_manager.getActiveNetworkInfo() != null
    && con_manager.getActiveNetworkInfo().isAvailable()
    && con_manager.getActiveNetworkInfo().isConnected()) {
   return true;
  } else {
   return false;
  }
 }
}

Add following permission to your AndroidManifest.xml to allow internet connection and to access Network Settings

< uses-permission android:name="android.permission.INTERNET" />
< uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />

Download Source Code from here CheckConnection Application

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Send Data to Another Activity - Simple Android Login

In this article you will learn how to send data from one Activity  to another Activity,I created two activity AndroidLoginActivity and LoginSuccess, in the LoinSuccess Activity will display logged user name.

•  Create Android project visit my previous  example  First Android Application in Eclipse Hello world Android Example, Un check the 

Add OnClickListener to Button and Send Data to next Activity

// Set OnClickListner to the login button 
Button login = (Button) findViewById(R.id.btn_login);

login.setOnClickListener(new View.OnClickListener() {

 @Override
 public void onClick(View v) {
  // Get user Name
  EditText loginName = (EditText) findViewById(R.id.txt_userName);
  String name = loginName.getText().toString();

  // create Intent and set LoginSuccess Activity 
  Intent intent = new Intent(getApplicationContext(),
    LoginSuccess.class);

  // put values to intent which will get in the LoginSuccess    Activity
 
  intent.putExtra("name", name);

  // Start LoginSuccess Activity 
  startActivity(intent);

 }
});

Create AndroidLoginActivity 

Right the project and create Java class and name it as AndroidLoginActivity, copy and past bellow code.

package jsupport.com;

import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;

public class AndroidLoginActivity extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.login);
       
     /* Set OnClickListner to the login button */
        Button login = (Button) findViewById(R.id.btn_login);
        
        login.setOnClickListener(new View.OnClickListener() {
   
   @Override
   public void onClick(View v) {
    
    EditText loginName = (EditText) findViewById(R.id.txt_userName);  
    String  name  = loginName.getText().toString();
    
    Intent intent  = new Intent(getApplicationContext(),LoginSuccess.class);
    
    intent.putExtra("name", name);
    
    startActivity(intent);
     
   }
  });
    }
}

Create new layout  for AndroidLoginActivity

Right click on res/layout , New-> Android XML give the file name as login , copy and past bellow 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:text="Login here" android:textAppearance="?android:attr/textAppearanceLarge" android:id="@+id/textView1" android:layout_height="wrap_content" android:layout_width="180dp" ></TextView>
    <TextView android:text="User Name " android:textAppearance="?android:attr/textAppearanceMedium" android:id="@+id/textView2" android:layout_height="wrap_content" android:layout_width="126dp"></TextView>
    <EditText android:layout_height="wrap_content" android:id="@+id/txt_userName" android:layout_width="272dp">
        <requestFocus></requestFocus>
    </EditText>
    <TextView android:text="Password" android:textAppearance="?android:attr/textAppearanceMedium" android:id="@+id/textView3" android:layout_width="wrap_content" android:layout_height="wrap_content"></TextView>
    <EditText android:layout_height="wrap_content" android:inputType="textPassword" android:id="@+id/password" android:layout_width="272dp"></EditText>
    <Button android:text="Login" android:layout_height="wrap_content" android:layout_width="126dp" android:id="@+id/btn_login" ></Button>
</LinearLayout>

Get Value from Intent

/* Get values from Intent */
 Intent intent =  getIntent();
        
 String name    =  intent.getStringExtra("name");

Create LoginSuccess Activity 

Right the project and create Java class and name it as  LoginSuccess  , copy and past bellow code.

package jsupport.com;


import android.app.Activity;
import android.content.Intent;
import android.os.Bundle;
import android.widget.TextView;

public class LoginSuccess extends Activity {

 public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.success);
        
        TextView txt_loggedName = (TextView) findViewById(R.id.txt_loggedName);
        
        /* Get values from Intent */
        Intent intent = getIntent();
        
        String name  = intent.getStringExtra("name");
        
        txt_loggedName.setText(name);
 }
}

Create new layout  for LoginSuccess 

Right click on res/layout , New-> Android XML give the file name as success, copy and past bellow xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
  xmlns:android="http://schemas.android.com/apk/res/android"
  android:orientation="vertical"
  android:layout_width="wrap_content"
  android:layout_height="wrap_content" android:weightSum="1">
    <TextView android:text="Hello" android:textAppearance="?android:attr/textAppearanceLarge" android:id="@+id/textView1" android:layout_width="158dp" android:layout_height="wrap_content" android:layout_weight="0.06"></TextView>
    <TextView android:text="Java Srilankan Support" android:textAppearance="?android:attr/textAppearanceLarge" android:layout_height="wrap_content" android:layout_width="match_parent" android:id="@+id/txt_loggedName"></TextView>
    
</LinearLayout>

Add AndroidLoginActivity and LoginSuccess  to AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
      package="jsupport.com"
      android:versionCode="1"
      android:versionName="1.0">
    <uses-sdk android:minSdkVersion="8" />

    <application android:icon="@drawable/icon" android:label="@string/app_name">
        <activity android:name=".AndroidLoginActivity"
                  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="LoginSuccess"></activity>

    </application>
</manifest>

AndroidLoginActivity   is the main activity


Download application source code from here  Simple Android Login

Read more...

Create Dynamic JButton with Image and ActionListener - Java Swing

In this tutorial you will learn how to create JButton dynamically with Image and the ActionListener . You will be able to change the button height , width horizontal gap and vertical gap in one place.

I have create dummy database class which will return the Main menu items and the Sub menu items.You will see the Main menu item in your JFrame. If you select main Item (FOOD) from the button panel it will load Sub Items from the dummy database class (sub items of the FOOD)

Here are the screen shots

Main menu items

Sub menu items

Create Main Frame

Open NetBeans and create New Project, name it as DynamicButton

• Add New JFrame Form give class name as DynamicSwingButton
• Add these code to your DynamicSwingButton class and import relevant classes and interfaces

  private final static int button_width   =   145;        // button width
private final static int button_height  =   140;        // button height
private final static int horizontalGap  =   10;         // horizontal gap in button
private final static int verticalGap    =   10;         // verticle gap in button
private final static int numberOfColumns=   4;          // number of colums in the button panel
private final static int fontSize       =   11;         // font size of button name
private final static int fontType       =   Font.BOLD;  // font type
private final static String fontName    =   "Thoma";    // font name
private final static Color  fontColor   =   new Color(0, 51, 255);  // font colot

• Add Scroll Pane to your Frame from the palette and set the height and width to Scroll Pane
• Add JPanel to the Scroll Pane and change the panel variable name as pnl_button
• Add bellow function to your DynamicSwingButton class

    private void addMainMenue() {

pnl_button.removeAll();
repaint();

Image img, sub;
ImageIcon icon;
String imagePath,imag = "/com/images/";

ArrayList menue = new ArrayList();
ArrayList itemName = new ArrayList();

for (int size = 0 ; size<ItemDB.mainMenuCodes.length; size++) {
menue.add(ItemDB.mainMenuCodes[size]);
itemName.add(ItemDB.mainMenuDesc[size]);
}

JButton[] buttons = new JButton[menue.size()];

for (int i = 0; i < buttons.length; i++) {

imagePath   = imag+menue.get(i).toString()+".jpeg";

URL url     = getClass().getResource(imagePath);
//   System.out.println(imagePath +"   Get Res : " +getClass().getResource(imagePath));

if(url!=null){
    img         = Toolkit.getDefaultToolkit().getImage(url);
    sub         = img.getScaledInstance(button_width - 8, button_height - 30, Image.SCALE_FAST);
    icon        = new ImageIcon(sub);
}
else
   icon        = new ImageIcon();

buttons[i]  = new JButton(itemName.get(i).toString(), icon);
buttons[i].setVerticalTextPosition(AbstractButton.BOTTOM);
buttons[i].setHorizontalTextPosition(AbstractButton.CENTER);

buttons[i].setBorder(javax.swing.BorderFactory.createEtchedBorder());
buttons[i].setFont(new java.awt.Font("Tahoma", 1, 13));
buttons[i].setForeground(new java.awt.Color(0, 51, 255));

buttons[i].setActionCommand(menue.get(i).toString());
buttons[i].addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent e) {
        String choice = e.getActionCommand();
        addSubmenue(choice);
    }
});
}

int b       =   0;
int vGap    =   verticalGap;
int hGap    =   horizontalGap;
int bLength =   buttons.length;
int bRows   =   bLength/numberOfColumns +1;

L1:    for (int j = 0; j <bRows; j++) {
    vGap = 10;
    for (int k = 0; k < numberOfColumns; k++) {

        pnl_button.add(buttons[b], new org.netbeans.lib.awtextra.AbsoluteConstraints(vGap, hGap, button_width, button_height));
        repaint();
        vGap +=button_width+verticalGap;
        b++;
        if(b>=bLength){
            break L1;
        }
    }
    hGap +=button_height+horizontalGap;
}
pack();
}

private void addSubmenue(String choice) {
pnl_button.removeAll();
repaint();

Image img, sub;
ImageIcon icon;
String imagePath,imag = "/com/images/";

ArrayList menue = new ArrayList();
ArrayList itemName = new ArrayList();

ArrayList   list  =   ItemDB.getSubMenu(choice);
String subCode[]  =   (String[]) list.get(0);
String subDesc[]  =   (String[]) list.get(1);

for (int size = 0 ; size<subCode.length; size++) {
menue.add(subCode[size]);
itemName.add(subDesc[size]);
}

JButton[] buttons = new JButton[menue.size()];

for (int i = 0; i < buttons.length; i++) {

imagePath   = imag+menue.get(i).toString()+".jpeg";

URL url     = getClass().getResource(imagePath);
//    System.out.println(imagePath +"   Get Reso : " +getClass().getResource(imagePath));

if(url!=null){
    img         = Toolkit.getDefaultToolkit().getImage(url);
    sub         = img.getScaledInstance(button_width - 8, button_height - 30, Image.SCALE_FAST);
    icon        = new ImageIcon(sub);
}
else
   icon        = new ImageIcon();



buttons[i]  = new JButton(itemName.get(i).toString(), icon);
buttons[i].setVerticalTextPosition(AbstractButton.BOTTOM);
buttons[i].setHorizontalTextPosition(AbstractButton.CENTER);

buttons[i].setBorder(javax.swing.BorderFactory.createEtchedBorder());
buttons[i].setFont(new java.awt.Font("Tahoma", 1, 13));
buttons[i].setForeground(new java.awt.Color(0, 51, 255));


buttons[i].setActionCommand(menue.get(i).toString());
buttons[i].addActionListener(new ActionListener() {

    public void actionPerformed(ActionEvent e) {
        String choice = e.getActionCommand();
        addItems(choice);
    }
});
}
int b       =   0;
int vGap    =   verticalGap;
int hGap    =   horizontalGap;
int bLength =   buttons.length;
int bRows   =   bLength/numberOfColumns +1;

L1:    for (int j = 0; j <bRows; j++) {
    vGap = 10;
    for (int k = 0; k < numberOfColumns; k++) {

        pnl_button.add(buttons[b], new org.netbeans.lib.awtextra.AbsoluteConstraints(vGap, hGap, button_width, button_height));
        repaint();
        vGap +=button_width+verticalGap;
        b++;
        if(b>=bLength){
            break L1;
        }
    }
    hGap +=button_height+horizontalGap;
}
pack();
}

private void addItems(String choice) {

if(choice.equals("P"))
choice  =   "PIZZA";
else if(choice.equals("B"))
choice  =   "BURGER";
else if(choice.equals("FJ"))
choice  =   "FRUIT JUICE";
else if(choice.equals("HB"))
choice  =   "HOT BEVERAGES";
JOptionPane.showMessageDialog(this, "You have select  "+choice);
}

• Go to Window->Navigating-> Inspector, Right Click your Frame and add window open event

• Add this function to windows opened event

  addMainMenue();

• Add tow buttons and name one as Back and another as Exit
• Select Back button and add Action performed event with addMainMenue(); function
• Select Exit button and add Action performed event with System.exit(0);
• Add this dummy database class to your project

import java.util.ArrayList;

/**
*
* @author JSupport
*/
class ItemDB {

public static String mainMenuCodes[]    =   {"FOOD","BEVE","FOOD","BEVE","FOOD","BEVE"};
public static String mainMenuDesc[]     =   {"FOOD","BEVERAGES","FOOD","BEVERAGES","FOOD","BEVERAGES"};
private static ArrayList list;

public static ArrayList getSubMenu(String mainMenuCodes){

    list    =   new ArrayList();
    if(mainMenuCodes.equals("FOOD")){
        String subCode[]  =   {"P","B"};
        String subDesc[]  =   {"PIZZA","BURGER"};

        list.add(subCode);
        list.add(subDesc);

    }else if(mainMenuCodes.equals("BEVE")){
        String subCode[]  =   {"FJ","HB"};
        String subDesc[]  =   {"Fruit Juice","Hot Beverages"};

        list.add(subCode);
        list.add(subDesc);
    }
    return list;
}
}

• Run the DynamicSwingButton frame.

Download DynamicSwingButton NetBean application from here

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Install Android application on Android Device

APK Creation in Eclipse and Install on Android Device

In this tutorial you will be learn how to install developed Android application on your Android Device. You must know the correct Android Version of your device before you going to create APK file.Here I am going to install previous Android ListView example with Image and Text  application on android device.

Device is Cisco Cius and the Android Version is 2.2.2 

Check API Levels 

Open your android AndroidListView  project in eclipse , you may download it from here AndroidListView. Go to the application property and select android on left pane. Select android version of your device

Change the  SDK API Level     <uses-sdk android:minSdkVersion="8" />      according to your version

Export Android Application and Create APK file 

Right click on the project and click on Export and select Export Android Application

Click next and select create new keystore give the name with location for key, give password and click next.

Fill required fields in the next screen and give the destination for APK file and finish it.

Allow Installation of non-Market Application

Now you create the APK file and it is ready to install on your Android Device. Your android device may give the permission to install your application. Select Unknown Source  Go to Setting -> Application Setting  ->Unknown Source and tick check box which will allow to install non-market application on your device.

Copy APK file to your SD card and insert it to your device, install it and run.

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Synthetica Look And Feel Java Swing

How to Apply Synthetica Look And Feel to JFrame in Netbeans

Here I am going to explain how to apply Synthetica Look And Feel to a JFrame in Netbeans,in the previous tutorial I was explained how to apply Nimbus Look and Feel Java Swing to a JFrame.You will be able to apply

• SyntheticaSkyMetallicLookAndFeel
• SyntheticaBlueMoonLookAndFeel
• SyntheticaBlueIceLookAndFeel
• SyntheticaWhiteVisionLookAndFeel
• and SystemLookAndFeel which will your OS look and feel.

To apply Synthetica look and feel you must add Synthetica libraries to your project class path.

This code will remove your current look and feel which will help to apply new look and feel clearly.

UIManager.removeAuxiliaryLookAndFeel(UIManager.getLookAndFeel());

To apply new look and feel you must use this code snip which will update all Component with new look and feel

SwingUtilities.updateComponentTreeUI(this);

Look and Feel change function

private void changeLookandFeel() {
        try {

            UIManager.removeAuxiliaryLookAndFeel(UIManager.getLookAndFeel());
            SyntheticaLookAndFeel.setWindowsDecorated(false);
            UIManager.setLookAndFeel(UIMANAGER_STRING);

//             for (int i = 0; i < LookAndFeel.getFrames().length; ++i) {
//                SwingUtilities.updateComponentTreeUI(LookAndFeel.getFrames()[i]);
//                SwingUtilities.updateComponentTreeUI(this);
//            }
            SwingUtilities.updateComponentTreeUI(this);

        } catch (Exception ex) {
            try {
                UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
            } catch (Exception e) {
                e.printStackTrace();
            }
        }
    }

Synthetica Blue Moon Look And Feel

Synthetica White Vision Look And Feel

System Look And Feel (Windows 7)

Synthetica Sky Metallic Look And Feel

Synthetica Blue Ice Look And Feel

Download the Netbean project from here Synthetica Look and Feel, you will be find libraries in the lib folder

 

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Nimbus Look and Feel Java Swing

It is very easy to apply  Nimbus Look and Feel which was introduced in Java SE 6 update 10 release. Copy and past following code before creating the (GUI) Graphical User Interface


Nimbus Look and Feel

Before Applying the Nimbus Look and Feel

try {
            UIManager.setLookAndFeel("com.sun.java.swing.plaf.nimbus.NimbusLookAndFeel");
            
        } catch (Exception ex) {
            // If the nibus is not available, GUI will set to the system's look and feel  
            UIManager.setLookAndFeel(UIManager.getSystemLookAndFeelClassName());
        }

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Send Email in Java Mail API using Gmail SMTP Server

To send email using java you must have mail server and user name and password to access the mail server. In this tutorial I used gmail SMTP server with SSL connection. You must add Java Mail API to your class path.

package jsupport.mail;

import java.util.Properties;
import javax.mail.Authenticator;
import javax.mail.Message;
import javax.mail.Message.RecipientType;
import javax.mail.MessagingException;
import javax.mail.PasswordAuthentication;
import javax.mail.Session;
import javax.mail.Transport;
import javax.mail.internet.InternetAddress;
import javax.mail.internet.MimeMessage;

/**
 *
 * @author Java Srilankan Support - JSupport
 */
public class SendMail {
    
    public void sendMail(String m_from,String m_to,String m_subject,String m_body){

      try {

            m_properties     = new Properties();
            m_properties.put("mail.smtp.host", "smtp.gmail.com"); 
            m_properties.put("mail.smtp.socketFactory.port", "465");
            m_properties.put("mail.smtp.socketFactory.class","javax.net.ssl.SSLSocketFactory");
            m_properties.put("mail.smtp.auth", "true");
            m_properties.put("mail.smtp.port", "465");
            

            m_Session        =   Session.getDefaultInstance(m_properties,new Authenticator() {
                protected PasswordAuthentication getPasswordAuthentication() {
                    return new PasswordAuthentication("username","password"); // username and the password
                }

            });
            
            m_simpleMessage  =   new MimeMessage(m_Session);

            m_fromAddress    =   new InternetAddress(m_from);
            m_toAddress      =   new InternetAddress(m_to);


            m_simpleMessage.setFrom(m_fromAddress);
            m_simpleMessage.setRecipient(RecipientType.TO, m_toAddress);
            m_simpleMessage.setSubject(m_subject);
            m_simpleMessage.setContent(m_body,"text/plain");

            Transport.send(m_simpleMessage);

        } catch (MessagingException ex) {
            ex.printStackTrace();
        }
    }

    public static void main(String[] args) {

      SendMail send_mail    =   new SendMail();
      send_mail.sendMail("from-mail@gmail.com", "to-mail@gmail.com", "Test Mail", "Hi this is Test mail from Java Srilankan Support");
    }

    private Session m_Session;
    private Message m_simpleMessage;
    private InternetAddress m_fromAddress;
    private InternetAddress m_toAddress;
    private Properties m_properties;
}

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Android ListView example with Image and Text

Android ListView

This tutorial I am going to show you how to create Android ListView with images and text. you will be find how to load image from the resources and how to set text to TextView. Here is the screen shot of ListView.

Android List View example on Samsung Galaxy Y s5360

ItemDetails class, which is help to set item data and you will be get data from the ItemDetails

package com.jsupport.listviewimages;

public class ItemDetails {

public String getName() {
return name;
}
public void setName(String name) {
this.name = name;
}
public String getItemDescription() {
return itemDescription;
}
public void setItemDescription(String itemDescription) {
this.itemDescription = itemDescription;
}
public String getPrice() {
return price;
}
public void setPrice(String price) {
this.price = price;
}
public int getImageNumber() {
return imageNumber;
}
public void setImageNumber(int imageNumber) {
this.imageNumber = imageNumber;
}

private String name ;
private String itemDescription;
private String price;
private int imageNumber;


}

ItemListBaseAdapter


which is extend from the BaseAdapter and set item details and the image 

package com.jsupport.listviewimages;

import java.util.ArrayList;


import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.TextView;

public class ItemListBaseAdapter extends BaseAdapter {
 private static ArrayList<ItemDetails> itemDetailsrrayList;
 
 private Integer[] imgid = {
   R.drawable.p1,
   R.drawable.bb2,
   R.drawable.p2,
   R.drawable.bb5,
   R.drawable.bb6,
   R.drawable.d1
   };
 
 private LayoutInflater l_Inflater;

 public ItemListBaseAdapter(Context context, ArrayList<ItemDetails> results) {
  itemDetailsrrayList = results;
  l_Inflater = LayoutInflater.from(context);
 }

 public int getCount() {
  return itemDetailsrrayList.size();
 }

 public Object getItem(int position) {
  return itemDetailsrrayList.get(position);
 }

 public long getItemId(int position) {
  return position;
 }

 public View getView(int position, View convertView, ViewGroup parent) {
  ViewHolder holder;
  if (convertView == null) {
   convertView = l_Inflater.inflate(R.layout.item_details_view, null);
   holder = new ViewHolder();
   holder.txt_itemName = (TextView) convertView.findViewById(R.id.name);
   holder.txt_itemDescription = (TextView) convertView.findViewById(R.id.itemDescription);
   holder.txt_itemPrice = (TextView) convertView.findViewById(R.id.price);
   holder.itemImage = (ImageView) convertView.findViewById(R.id.photo);

   convertView.setTag(holder);
  } else {
   holder = (ViewHolder) convertView.getTag();
  }
  
  holder.txt_itemName.setText(itemDetailsrrayList.get(position).getName());
  holder.txt_itemDescription.setText(itemDetailsrrayList.get(position).getItemDescription());
  holder.txt_itemPrice.setText(itemDetailsrrayList.get(position).getPrice());
  holder.itemImage.setImageResource(imgid[itemDetailsrrayList.get(position).getImageNumber() - 1]);

  return convertView;
 }

 static class ViewHolder {
  TextView txt_itemName;
  TextView txt_itemDescription;
  TextView txt_itemPrice;
  ImageView itemImage;
 }
}

ListViewImagesActivity

package com.jsupport.listviewimages;

import java.util.ArrayList;

import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import android.widget.AdapterView.OnItemClickListener;

public class ListViewImagesActivity extends Activity {
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);

ArrayList<ItemDetails> image_details = GetSearchResults();

final ListView lv1 = (ListView) findViewById(R.id.listV_main);
lv1.setAdapter(new ItemListBaseAdapter(this, image_details));

lv1.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> a, View v, int position, long id) {
Object o = lv1.getItemAtPosition(position);
ItemDetails obj_itemDetails = (ItemDetails)o;
Toast.makeText(ListViewImagesActivity.this, "You have chosen : " + " " + obj_itemDetails.getName(), Toast.LENGTH_LONG).show();
} 
});
}

private ArrayList<ItemDetails> GetSearchResults(){
ArrayList<ItemDetails> results = new ArrayList<ItemDetails>();

ItemDetails item_details = new ItemDetails();
item_details.setName("Pizza");
item_details.setItemDescription("Spicy Chiken Pizza");
item_details.setPrice("RS 310.00");
item_details.setImageNumber(1);
results.add(item_details);

item_details = new ItemDetails();
item_details.setName("Burger");
item_details.setItemDescription("Beef Burger");
item_details.setPrice("RS 350.00");
item_details.setImageNumber(2);
results.add(item_details);

item_details = new ItemDetails();
item_details.setName("Pizza");
item_details.setItemDescription("Chiken Pizza");
item_details.setPrice("RS 250.00");
item_details.setImageNumber(3);
results.add(item_details);

item_details = new ItemDetails();
item_details.setName("Burger");
item_details.setItemDescription("Chicken Burger");
item_details.setPrice("RS 350.00");
item_details.setImageNumber(4);
results.add(item_details);

item_details = new ItemDetails();
item_details.setName("Burger");
item_details.setItemDescription("Fish Burger");
item_details.setPrice("RS 310.00");
item_details.setImageNumber(5);
results.add(item_details);

item_details = new ItemDetails();
item_details.setName("Mango");
item_details.setItemDescription("Mango Juice");
item_details.setPrice("RS 250.00");
item_details.setImageNumber(6);
results.add(item_details);


return results;
}
}

Download complete project here Android ListView

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