Rating Bar control in Android
In this article I am going to
explain how to create rating bar control in an android application by using
RatingBar widget. When a user click
on the rating bar, a new rating will be displayed by the toast message.
Start a new project, named RatingBarDemo.
Open res/layout/main.xml and add a RatingBar widget inside the linear
layout.
<?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">
<RatingBar android:id="@+id/ratingbar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:numStars="5"
android:stepSize="1.0"
/>
</LinearLayout>
Now we have to show the new rating to the user by using toast message. To do
this add the following code in the activity:
import
android.app.Activity;
import
android.os.Bundle;
import
android.widget.RatingBar;
import
android.widget.Toast;
import
android.widget.RatingBar.OnRatingBarChangeListener;
public
class RatingBarActivity
extends Activity {
@Override
public
void onCreate(Bundle
savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
final RatingBar ratingbar = (RatingBar)
findViewById(R.id.ratingbar);
ratingbar.setOnRatingBarChangeListener(new
OnRatingBarChangeListener() {
public
void
onRatingChanged(RatingBar ratingBar,
float rating,
boolean fromUser) {
Toast.makeText(RatingBarActivity.this,
"New Rating:
"+rating, Toast.LENGTH_SHORT).show();
}
});
}
}
The above code captures the
RatingBar widget from the layout with
findViewById(int) and then sets an
RatingBar.OnRatingBarChangeListener. The
onRatingChanged() callback method then defines the action to perform
when the user sets a rating. In this case, a simple
Toast message displays the new rating.
Run the
application
You output look something like this:
When users select a new rating, a rating will be
displayed in the toast message.