Dr. Ramkumar Lakshminarayanan article published in Tamil Computer Magazine. The content is about using rating bar in android.

1. ݇†ó£Œ´ÜŠO
«èê¡à¼õ£‚°
õ «î¬õò£ù ðô
衆«ó£™è¬÷ªè£‡
´œ÷¶.  ðò¡ð´ˆ
¶‹ SDK-‚° ãŸð 衆
«ó£™èÀ‹ ñ£Áð´‹.
ºî™ ꣡ø£è Rating
Bar ðò¡ð´ˆ¶õ¶ âš
õ£Á â¡ð¬îŠ 𣘊
«ð£‹.
ºîL™ ݇†
󣌴 ÜŠO«èê¡ à¼
õ£‚°õ â‚OŠC™
¹Fò Šó£ªü‚† å¡
P¬ù ªî£ìƒè «õ‡
´‹.
<?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" >
<TextView
android:id="@+id/lblRateMe"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/rate"
android:textAppearance="?android:attr/textA
ppearanceMedium" />
<RatingBar
android:id="@+id/ratingBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numStars="4"
android:stepSize="1.0"
android:rating="2.0" />
<Button
android:id="@+id/btnSubmit"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/submit" />
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="fill_parent"
android:layout_height="wrap_content" >
<TextView
android:id="@+id/lblResult"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="@string/result"
android:textAppearance="?android:attr/textApp
earanceLarge" />
<TextView
android:id="@+id/txtRatingValue"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
android:textAppearance="?android:attr/textApp
earanceSmall" />
</LinearLayout>
</LinearLayout>
Rating Bar Palette-™ àœ÷ ç𣘋
M†ªü†®™ (Form Widget) Þ¼‚°‹. (ðì‹-1)
ÜŠO«èêQ™ àœ÷ main.xml-™ ªì‚v†
MÎ, «ó†®ƒ 𣘠ð†ì¬ù ªè£‡´
F¬óJ¬ù à¼õ£‚è «õ‡´‹. main.xml
-‚è£ù Gó™ -1™ ªè£´‚èŠð†´œ÷¶.ðì‹-2
Gó™-1
ðì‹-3
ðì‹-1
«ó†®ƒ ð£˜
ðò¡ð´ˆ¶‹
º¬ø!

2. Ý¡†ó£Œ´ -2
Þ󣋰ñ£˜ ªô†²Iï£ó£òí¡
16
public class RatingbarActivity extends Activity
{
/** Called when the activity is first
created. */
private RatingBar ratingBar;
private TextView txtRatingValue;
private Button btnSubmit;
@Override
public void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnRatingBar();
addListenerOnButton();
}
public void addListenerOnRatingBar() {
ratingBar = (RatingBar)
findViewById(R.id.ratingBar);
txtRatingValue = (TextView)
findViewById(R.id.txtRatingValue);
//if rating value is changed,
//display the current rating value in the
result (textview) automatically
ratingBar.setOnRatingBarChangeListener(
new OnRatingBarChangeListener() {
public void
onRatingChanged(RatingBar ratingBar, float
rating,
boolean fromUser) {
txtRatingValue.setText(String.valueOf(ratin
g));
}
});
}
public void addListenerOnButton() {
ratingBar = (RatingBar)
findViewById(R.id.ratingBar);
btnSubmit = (Button)
findViewById(R.id.btnSubmit);
//if click on me, then display the current
rating value.
btnSubmit.setOnClickListener(new
OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(RatingbarActivity.this,
String.valueOf(ratingBar.getRating()),
Toast.LENGTH_SHORT).show();
}
});
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RatingBar;
import
android.widget.RatingBar.OnRatingBarChan
geListener;
import android.widget.TextView;
import android.widget.Toast;
Gó™-2
Gó™-3
Gó™-4
Gó™-5
ðì‹-4
ðì‹-5
Gó™ -1™ 𣘈b˜èœ
â¡ø£™ âˆî¬ù
«ó†®ƒ 𣘠«õ‡´‹
â¡ðî¬ù»‹ Step size
ñŸÁ‹ rating â¡ù â¡
ðî¬ù °PŠH†´œ
«÷£‹. main.xml-‚è£ù
F¬ó ðì‹-2™ àœ÷¶
«ð£¡Á‹ «î£¡Á‹.
Ü´ˆ¶ main.xml -‚è£ù
Ý‚®M†®J¬ù Rating
bar Activity.java âù ªðò
KìŠð†´œ÷¶.
ºîL™ ÜŠO«èê¡
«î¬õò£ù «ð‚«èx
è¬÷ Import ªêŒò
«õ‡´‹. (Gó™-2). Rating
bar Activity Class Activity
Class -ä Extend ªêŒ¶

3. package com.ram.ratingbar;
import android.app.Activity;
import android.os.Bundle;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RatingBar;
import
android.widget.RatingBar.OnRatingBarChange
Listener;
import android.widget.TextView;
import android.widget.Toast;
public class RatingbarActivity extends Activity
{
/** Called when the activity is first created.
*/
private RatingBar ratingBar;
private TextView txtRatingValue;
private Button btnSubmit;
@Override
public void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
addListenerOnRatingBar();
addListenerOnButton();
}
public void addListenerOnRatingBar() {
ratingBar = (RatingBar)
findViewById(R.id.ratingBar);
txtRatingValue = (TextView)
findViewById(R.id.txtRatingValue);
//if rating value is changed,
//display the current rating value in the
result (textview) automatically
ratingBar.setOnRatingBarChangeListener(new
OnRatingBarChangeListener() {
public void onRatingChanged(RatingBar
ratingBar, float rating,
boolean fromUser) {
txtRatingValue.setText(String.valueOf(rating));
}
});
}
public void addListenerOnButton() {
ratingBar = (RatingBar)
findViewById(R.id.ratingBar);
btnSubmit = (Button)
findViewById(R.id.btnSubmit);
//if click on me, then display the current
rating value.
btnSubmit.setOnClickListener(new
OnClickListener() {
@Override
public void onClick(View v) {
Toast.makeText(RatingbarActivity.this,
String.valueOf(ratingBar.getRating()),
Toast.LENGTH_SHORT).show();
}
});
}
}
<?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" >
<ProgressBar
android:id="@+id/progressBar1"
style="?android:attr/progressBarStyleLarge"
android:layout_width="wrap_content"
android:layout_height="wrap_content" />
</LinearLayout>
Gó™-6
Gó™-7
ðì‹-6
ðò¡ð´ˆî «õ‡´‹. GóL™ ðò¡ð´ˆî
«ó†®ƒ 𣘂° ÝŠªü‚† ñ£PLò£è
«ó†®ƒ 𣘠â¡Á‹, ªì‚v† MÎMŸ°
ÝŠªü‚† ñ£PLò£è txtRating Value â¡Á‹,
ð†ìQŸ° (Button) ÝŠªü‚† ñ£PLò£è
btnsubmit Ýè ðò¡ð´ˆF àœ«÷£‹.
Oncrate ðò¡ð£†®™ SetContentView
Íô‹ main.xml -î¬ù
GóL™ Þ¬í‚A«ø£‹.
Ü´ˆ¶ addListerner
OnRating Bar() ñŸÁ‹
addListernerOnButton()
ðò¡ð´ˆîŠð†´œ÷¶.
«ó†®ƒ 𣘠AO‚ ªêŒ
»‹«ð£¶ â¡ù ï¬ì
ªðø «õ‡´‹ â¡ð
î¬ù addListernerOnRat
ingBar()-™ °PŠHì
«õ‡´‹. ð†ì¬ù
AO‚ ªêŒ»‹«ð£¶
â¡ù ï¬ìªðø «õ‡
´‹ â¡ðî¬ù

4. package ram.com.progressbar;
import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.widget.ProgressBar;
public class ProgressbarActivity extends
Activity {
/** Called when the activity is first
created. */
// private static final int PROGRESS = 0x1;
private ProgressBar mProgress;
private int mProgressStatus = 0;
private Handler mHandler = new
Handler();
@Override
public void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mProgress = (ProgressBar)
findViewById(R.id.progressBar1);
// Start lengthy operation in a
background thread
new Thread(new Runnable() {
public void run() {
while (mProgressStatus < 100)
{
// mProgressStatus =
doWork();
// Update the progress bar
mHandler.post(new
Runnable() {
public void run() {
mProgress.setProgress(mProgressStatus);
}
});
}
}
}).start();
}
}
- ªî£ì¼‹
Gó™-8
ðì‹-7
addListernerOnButton() -™ °PŠHì «õ‡´‹.
(Gó™-3)
â‰î «ó†®ƒA¬ù AO‚ ªêŒA«ø£«ñ£,
ÜîŸè£ù ñFŠ¹ ªì‚v† MÎM™ «î£¡Á
õîŸè£è addListernerOnRatingBar()-‚è£ù
Gó™-4 ðò¡ð´Aø¶. Submit ð†ì¬ù AO‚
ªêŒî¾ì¡ â¡ù «ó†®ƒ àœ÷¶ â¡ð
î¬ù 裇H‚è addListernerOnButton() -‚è£ù
Gó™ ðò¡ð´Aø¶. F¬óJ™ 裇H‚è toast
ðò¡ð´ˆîŠð†´œ÷¶. (Gó™ -5)
«ó†®ƒ 𣘠݂®M†®‚è£ù Gó™ -6™
ªè£´‚èŠð†´œ÷¶. «ó†®ƒ 𣘠܊O
«èê¬ù ªêò™ð´ˆ¶õ RunRatingBar
â¡ø ð†ì¬ù â‚OŠC™ AO‚ ªêŒî£™
ªî£ìƒ°‹. (ðì‹-3)
ÜŠO«èê¡ ªêò™ðì ªî£ìƒAò¾ì¡
ðì‹-4™ àœ÷¶ «ð£¡Á F¬ó «î£¡Á‹.
Í¡ø£õ¶ Start (rating) J¬ù «î˜¾ ªêŒ
î¾ì¡ KꙆ®¡ ñFŠ¹ 3.0 â¡Á ñ£Á‹.
(ðì‹-5)
Submit -ä AO‚ ªêŒî¾ì¡ îèõ™
F¬óJ™ «î£¡Á‹. (ðì‹-6) Þ‰î ꣡Á
Íô‹ «ó†®ƒ 𣘠ðò¡ð´ˆ¶õ¶ âšõ£Á
â¡Á 𣘈«î£‹.
Ü´ˆî ꣡ø£è Progress Bar ðò¡ð´ˆ
¶õ¶ âšõ£Á â¡Á 𣘊«ð£‹. Progress
Bar -介 «ðô†®™ àœ÷ ç𣘋 M†
ªü†®L¼‰¶ «î˜‰ªî´‚èô£‹. Šó£Aóv
𣼂è£ù Gó™-7™ ªè£´‚èŠ ð†´œ÷¶.
Þƒ° Linear Layout ðò¡ð´ˆF Šó£Aóv
𣘠ðò¡ð´ˆîŠð†´œ÷¶. main.xml -è£ù
Activity -Progressbar Activity Ý°‹. Šó£Aóv
𣘠݂®M†®JÂœ thread å¡P¬ù à¼
õ£‚è «õ‡´‹.
Gó™-8-™ Ý‚®M†®J™ ðò¡ð´ˆîŠ
ð´‹ Gó™ ªè£´‚èŠð†´œ÷¶. ÜŠO
«èê¡ ªêò™ð†ì¾ì¡ ðì‹-7-™ àœ÷¶
«ð£¡Á Šó£Aóv 𣘠F¬óJ™ «î£¡Á‹.