Dr. Ramkumar Lakshminarayanan article published in Tamil Computer Magazine. The content is about creating Android Application notification.

1. ðô Å›G¬ôèO™ ðò÷£˜èÀ‚° îèõ™
è¬÷ ªîKMŠð Notification º¬ø
ðò¡ð´Aø¶. «ï£†®çH«èê¬ù Í¡Á
º¬øèO™ ݇†ó£Œ®™ à¼õ£‚è º®»‹.
1. «ì£v† «ï£†®çH«èê¡ (Toast Notifi
cation) 2. v«ì†ìv 𣘠«ï£†®çH«èê¡
(Status Bar Notification) 3. ìòô£‚ «ï£†®
çH«èê¡ (Dialog Notification)
«ì£v†
«ï£†®çH«èê¡
(Toast Notification)
«ì£v† «ï£†®
çH«èê¡ ðò¡ð£†
®™ àœ÷ F¬óJ™
«î£¡Á‹. ªð¼‹ð£
½‹ å¼ ªêò™ ï¬ì
ªðŸÁœ÷¶ â¡
ðî¬ù ðòù£÷˜
èÀ‚° ªîKMŠð
«ì£v† ðò¡ð´A
ø¶. ꣡ø£è Üô£˜‹
«ïóˆF¬ù ñ£ŸPò
¾ì¡ «ïó‹ ñ£P»œ÷¶ â¡ðî¬ùˆ ªîK
MŠð‹, îèõ™
«ì†ì£«ðC™ «êI‚
èŠð´œ÷¶ â¡ð
î¬ùˆ ªîKMŠðîŸ
°‹ ðò¡ð´Aø¶.
v«ì†ìv ð£˜
«ï£†®çH«èê¡
(Status Bar Notifica-
tion)
v«ì†ìv ð£˜
«ï£†®H«èê¡ÜŠO
«èê¡ «ñ™ð°FJ™
«î£¡Á‹. ꣡ø£è,
âvâ‹âv õ‰¶œ÷¶ â¡ð¬î ªîKMˆ¶
܉î îèõ¬ô «î˜‰ªî´ˆî£™ âvâ‹âv
J¬ù ð®‚èô£‹. ¹Fò ÜŠO«èê¡ GÁ¾Al˜
èœ, GÁMò¾ì¡
v«ì†ìv«ï£†®
H«èê¡ Íô‹ GÁ¾
î™ º®‰¶ M†ì¶
â¡ðî¬ù ªîKòŠ
ð´ˆîô£‹. ܉î
v«ì†ìv 𣘠«ï£†®H«èê¬ù AO‚
ªêŒ¶ 𣘈 ðòù£÷¼‚° â¡ù ï¬ì
ªðŸÁœ÷¶ â¡ø îèõ™ «î£¡Áñ£Á
à¼õ£‚°õ v«ì†ìv 𣘠«ï£†®
H«èê¡ ðò¡ð´ Aø¶.
îèõ™ ªîKM‚°‹ º¬ø
ìòô£‚ «ï£†®çH«èê¡ (Dialog Notification)
ªêò™ð†´ ªè£‡®¼‚°‹ Ý‚®M†
®‚° (Activity) «ñ«ô îèõ¬ôˆ ªîKMˆ¶,
H¡ù˜ ܉î F¬óJ™ «î˜‰ªî´‚°‹ àœ
k†®Ÿ° ãŸð ªêò™è¬÷ ñ£ŸP ܬñ‚è
ìòô£è «ï£†®çH«èê¡ ðò¡ð´Aø¶. ꣡
ø£è å¼ F¬óJL¼‰¶ ñŸªø£¼ F¬ó‚°
ªê™õ ðòù£÷¼‚° æ.«è. ñŸÁ‹ «è¡ê™
â¡ø «î˜M¬ù ÜOˆ¶, æ.«è. ªè£´ˆî£™
Ü´ˆî F¬ó‚° ªê™ô «õ‡´‹, «è¡ê™
ªè£´ˆî£™ Ü«î F¬óJ™ Þ¼‚è «õ‡´‹
«ð£¡ø ªêò™ð£†®¬ù à¼õ£‚è ìòô£‚
«ï£†®çH«èê¡ ðò¡ð´Aø¶.
«ì£v† «ï£†®çH«èê¬ù ݇†ó£Œ´
ÜŠO‚«èêQ™ ðò¡ð´ˆ¶õ «ì£v†
ÝŠªü‚† ðò¡ð´Aø¶. îèõ™è¬÷ F¬ó
J™ 裇ð makeText() ªñˆî®Ÿ° Í¡Á
Mîñ£ù îèõ™è¬÷ ªè£´‚è «õ‡´‹.
ܬõ â‰î F¬ó, â¡ù îèõ™ ñŸÁ‹ âš
õ÷¾ «ïó‹ â¡ðùõŸ¬ø ªè£´‚è «õ‡
´‹. «ì£v†®¬ù ÜŠO‚«èêQ™ 裇
HŠð show() ªñˆî† ðò¡ð´Aø¶. ꣡
ø£è, (Gó™-1)
ðì‹-1
ðì‹-2
ðì‹-3
Gó™-1
Gó™-2
Gó™-3

2. Toast F¬óJ¡ â‰îŠ ð°FJ™ «î£¡ø
«õ‡´‹ â¡ðî¬ù °PŠð setGravity()
ªñˆî† ðò¡ð´Aø¶.
꣡ø£è,
toast.setGravity(Gravity.Top,o,o,);
Ü™ô¶
toast.setGravity(Gravity.LEFT,O,O);
Ü´ˆ¶ «ï£†®çH«èê¬ù, v«ì†ìú
ð£K™ à¼õ£‚°‹ º¬øJ¬ù 𣘊«ð£‹.
¹Fò Šó£ªü‚† å¡P¬ù à¼õ£‚°«õ£‹.
Project Name â¡ðî¬ù Notification Manager
âù ¬õˆ¶‚ ªè£œ«õ£‹. Ý‚®M†®
ªðòK¬ù Create Notification âùŠ ªðòK´
«õ£‹. ÜF™ mail.xml -Ÿè£ù «è£´ (code)
Gó™ 2-™ ªè£´‚èŠð†´œ÷¶. Ü´ˆîî£è
result.xml â¡ø ç¬ðL¬ù Gó™ 3-™ àœ÷¶
«ð£¡Á à¼õ£‚è «õ‡´‹. result.xml ‚è£ù
Activity Notification Receiver â¡ð‹. ÜF™
Ý¡†ó£Œ´ -2
Þ󣋰ñ£˜ ªô†²Iï£ó£òí¡
06
import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Intent;
import android.os.Bundle;
import android.view.View;
public class CreateNotification extends Activity
{
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
}
public void createNotification(View view) {
NotificationManager
notificationManager = (NotificationManager)
getSystemService(NOTIFICATION_SERVICE);
Notification notification = new
Notification(R.drawable.icon,
"A new notification",
System.currentTimeMillis());
// Hide the notification after its selected
notification.flags |=
Notification.FLAG_AUTO_CANCEL;
Intent intent = new Intent(this,
NotificationReceiver.class);
PendingIntent activity =
PendingIntent.getActivity(this, 0, intent, 0);
notification.setLatestEventInfo(this, "This is the
title",
"This is the text", activity);
notification.number += 1;
notificationManager.notify(0,
notification);
<?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:layout_width="fill_parent"
android:layout_height="wrap_content"
android:text="@string/hello" />
<Button
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/button1"
android:text="@string/btn_name"></Button>
</LinearLayout>
Gó™-4
Gó™-5
Gó™-6

3. package com.ram.dialogex;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.view.View;
import android.widget.*;
public class DialogExActivity extends Activity {
/** Called when the activity is first created.
*/
Button b1;
@Override
public void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
b1 = (Button)findViewById(R.id.button1);
b1.setOnClickListener(new
View.OnClickListener() {
@Override
public void onClick(View v) {
// TODO Auto-generated method stub
AlertDialog alertDialog = new
AlertDialog.Builder(DialogExActivity.this).creat
e();
alertDialog.setTitle("Reset...");
alertDialog.setMessage("R u sure?");
alertDialog.setIcon(R.drawable.icon);
alertDialog.setButton("OK", new
DialogInterface.OnClickListener() {
public void
onClick(DialogInterface dialog, int which) {
//here you can add functions
} });
alertDialog.show();
}
})
;
}
}
ðì‹-4
ðì‹-5
Gó™-7
Gó™-8
Gó™ A™ àœ÷¶ «ð£¡ø Š«ó£Aó£
I¬ù à¼õ£‚è «õ‡´‹. Þ‰î ç¬ðL™
result.xml notificationmanager Activity -»ì¡
SetContentView(R.layout.result) â¡ø õKJ¡
Íô‹ ެ특 ãŸð´ˆF»œ«÷£‹. Ü´ˆ¶
CreateNotifoca
t i o n- Ÿ è £ ù
Gó¬ô à¼õ£
‚è «õ‡´‹.
«ï£†®çH«è
êQ¬ù Þ‰î
꣡P™ CreateNotification â¡ø ªð£ˆî£¬ù‚
AO‚ ªêŒî¾ì¡ ªêò™ ï¬ìªðÁõ
main.xml ç¬ðL™ «ï£†®çH«èê¡ «ñ«ù
ü¬ó ðò¡ð´ˆî «õ‡´‹. CreateNotification
-Ÿè£ù Gó™ ä‰F™ ªè£´‚èŠð†´œ÷¶.
ÜŠO‚«èê¬ù ªêò™ð´ˆ¶õ º¡
sAndroidManifest.xml ç¬ðL™ W›‚è‡ì õK
è¬÷ Þ¬í‚è «õ‡´‹.
ÜŠO«èê¬ù„ ªêò™ð´ˆ¶õ sRun
As -> Andriod Application â¡Á ªè£´‚è «õ‡
´‹.
F¬óJ™ «î£¡Á‹ Create Notification
â¡ø ªð£ˆî£¬ù‚ AO‚ ªêŒî£™ «ï£†®
çH«èê¡ v«ì†ìv 𣘠«î£¡Á‹.
Ü´ˆîî£è ìòô£‚ «ï£†®çH«èêQŸ
è£ù ꣡Á à¼õ£‚°‹ º¬ø¬òŠ 𣘊
«ð£‹.
Dialog Notification Dialog A÷£R¬ù
Ü®Šð¬ìò£è‚ ªè£‡´ à¼õ£‚èŠð´Aø¶.
ìòô£‚ A÷£C¬ù Ü®Šð¬ìò£è ªè£‡´
Alert Dialog, Progress Dialog, DatePickerDialog,
TimePickerDialog «ð£¡ø¬õ àœ÷ù. Ý‚®
M†®J¬ùÜ®Šð¬ìò£èªè£‡«ììòô£‚

4. package com.ram.datepickerexample;
import android.app.Activity;
import java.util.Calendar;
import android.app.DatePickerDialog;
import android.widget.DatePicker;
import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
public class DatePickerExampleActivity
extends Activity {
private TextView mDateDisplay;
private int mYear;
private int mMonth;
private int mDay;
static final int DATE_DIALOG_ID = 1;
@Override
protected void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mDateDisplay = (TextView)
findViewById(R.id.dateDisplay);
Button pickDate = (Button)
findViewById(R.id.pickDate);
pickDate.setOnClickListener(new
View.OnClickListener() {
public void onClick(View v) {
showDialog(DATE_DIALOG_ID);
}
});
final Calendar c =
Calendar.getInstance();
mYear = c.get(Calendar.YEAR);
mMonth = c.get(Calendar.MONTH);
mDay =
c.get(Calendar.DAY_OF_MONTH);
updateDisplay();
}
@Override
protected Dialog onCreateDialog(int id) {
switch (id) {
case DATE_DIALOG_ID:
return new
DatePickerDialog(this,
mDateSetListener,
mYear, mMonth, mDay);
}
return null;
}
protected void onPrepareDialog(int id,
Dialog dialog) {
switch (id) {
case DATE_DIALOG_ID:
((DatePickerDialog)
dialog).updateDate(mYear, mMonth, mDay);
break;
}
}
private void updateDisplay() {
mDateDisplay.setText(
new StringBuilder()
// Month is 0 based so add 1
.append(mMonth + 1).append("-
")
.append(mDay).append("-")
.append(mYear).append(" "));
}
private DatePickerDialog.OnDateSetListener
mDateSetListener =
new
DatePickerDialog.OnDateSetListener() {
public void onDateSet(DatePicker
view, int year, int monthOfYear,
int dayOfMonth) {
mYear = year;
mMonth = monthOfYear;
mDay = dayOfMonth;
updateDisplay();
}
};
}
ðì‹-6
Gó™-9
à¼õ£‚èŠð´‹. Ý‚®M†®JL¼‰¶ ìòô£‚
à¼õ£‚°õ OnCreateDialog(int) â¡ø
ªñˆî† ðò¡ð´Aø¶.
Üô£˜† ìòô£‚ ªêòL¬ù ÜP‰¶ ªè£œ
õ ¹Fò Šó£ªü‚† Ýè Dialog Ex â¡
ðî¬ù à¼õ£‚°«õ£‹. ÞF™ Button å¡P¬ù
à¼õ£‚A Üî¬ù AO‚ ªêŒî£™ Üô£˜†
ìòô£‚ «î£¡Á‹. ÞîŸè£ù «ôܾ† ç¬ð™
main.xml Ý°‹. (Gó™ 6)
main.xml L™ à¼õ£‚A
àœ÷ ªð£ˆî£Q¡ ªðò˜
Button 1 â¡ð‹. ªð£ˆ
ù DialogExActivity -J™
ެ특 ãŸð´ˆî ºîL™ ªð£ˆî£¡
ÝŠªü‚®¬ù à¼õ£‚è «õ‡´‹.
Button b1 ;
H¡¹
b1 = (Button) findViewById(R.id.button1);
â¡Á ðò¡ð´ˆî «õ‡´‹.
ªð£ˆî£¬ù‚ AO‚ ªêŒî£™ ªêò™
ï¬ìªðÁõ b1. SetOnClickListener();
â¡ðî¬ù ðò¡ð´ˆî «õ‡´‹.
Üô£˜†ìòô£‚A¬ùà¼õ£‚°
õ Alert.Dialog.Builder ðò¡
ð´Aø¶.

5. - ªî£ì¼‹
ðì‹-7
AlertDialog alertdialog=new AlertDialog.
Builder(DialogExActivity.this).create Ý°‹.
Üô£˜† ìòô£‚ ªêò™ð£†®Ÿè£ù Gó™
7-™ ªè£´‚èŠð†´œ÷¶. ÜîŸè£ù F¬ó
ðì‹ 5-™ àœ÷¶ «ð£¡Á «î£¡Á‹.
Ü´ˆîî£è Progress Dialog ðò¡ð´ˆ¶‹
º¬øJ¬ù 𣘊«ð£‹. ꣡ø£è,
ProgressDialog dialog = progressDialog.show(
DialogExActivity.this,"",
"Please Wait for few Seconds...",true);
Progress Dialog -J¬ù GÁˆ¶õîŸè£ù
ðò¡ð£´.
ProgressDialogName.dismiss();
 ðò¡ð´ˆF àœ÷ ꣡P™ dialog.
dismiss(),; â¡Á ðò¡ð´ˆî «õ‡´‹.
Progress Dialog ÜŠO‚«èêQ™F¬ó 6-™
àœ÷¶ «ð£¡Á «î£¡Á‹.
Date Picker Dialog -J¬ù à¼õ£‚è main.
xml ç¬ðL¬ù «ôܾ† Ýè ܬñˆ¶ Text
View ñŸÁ‹ Button Þ¼‚°ñ£Á à¼õ£‚è
«õ‡´‹. ð†ìQ¬ù‚ AO‚ ªêŒî£™ Date
Picker Dialog «î£¡Áñ£Á Date Picker
Example Activity -J¬ù à¼õ£‚è «õ‡´‹.
DatePickerExampleActivity.java â¡ø Class
ç¬ðL™ Cô Member è¬÷ Þ¬í‚è
«õ‡´‹. ܬõ,
sprivate Textview mDateDisplay:
private Button mDate:
private int mYear;
private int mMonth;
private int mDay;
Static final int DATE-DAALOG-ID=O;
H¡ù˜ On create () ªñˆî®¬ù à¼õ£‚è
«õ‡´‹.
ºîL™ GóL¬ù main.xml -Ÿ° ܬñˆ
Fì «õ‡´‹. H¡ù˜ ªì‚v† MÎ ñŸÁ‹
ð†ìQ¬ù FindviewById(int) Íô‹
«ôܾ† ®™ Þ¼‰¶ ªðø «õ‡´‹. viewon
clicklistee ner Íô‹ ð†ìQ¬ù AO‚
ªêŒ»‹«ð£¶ showDialog(int) ªêò™ð´ˆ¶‹.
H¡ù˜ è£ô‡ìKL¼‰¶ ݇´, ñ£î‹
ñŸÁ‹ «îF ÝAò îèõ™è¬÷ ªðŸÁ H¡ù˜
updateDisplay() ªñˆî† ܬö‚èŠð†´
ªì‚v† MÎM™  «î˜‰ªî´‚°‹ «îF
«î£¡Á‹. «ì†ì£H‚è˜ ìòô£‚AŸè£ù
(DataPicker Dialog) Gó™ 9-™ ªè£´‚èŠð†
´œ÷¶. DataPicker Dialog «î£¡Á‹ F¬ó
ðì‹ 7- ™ 裇H‚èŠð†´œ÷¶.