RatingBar
Android RatingBar can be used to get the rating from the user. The Rating returns a floating-point number. It may be 2.0, 3.5, 4.0 etc.
Android RatingBar displays the rating in stars. Android RatingBar is the subclass of AbsSeekBar class.
The getRating() method of android RatingBar class returns the rating number.
Android RatingBar Example
Let's see the simple example of rating bar in android.
activity_main.xml
Drag the RatingBar and Button from the pallete, now the activity_main.xml file will like this:
File: activity_main.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="example.javatpoint.com.ratingbar.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="submit"
android:id="@+id/button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.615" />
<RatingBar
android:id="@+id/ratingBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="72dp"
android:layout_marginTop="60dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
<android.support.constraint.ConstraintLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
tools:context="example.javatpoint.com.ratingbar.MainActivity">
<Button
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text="submit"
android:id="@+id/button"
app:layout_constraintBottom_toBottomOf="parent"
app:layout_constraintLeft_toLeftOf="parent"
app:layout_constraintRight_toRightOf="parent"
app:layout_constraintTop_toTopOf="parent"
app:layout_constraintVertical_bias="0.615" />
<RatingBar
android:id="@+id/ratingBar"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="72dp"
android:layout_marginTop="60dp"
app:layout_constraintStart_toStartOf="parent"
app:layout_constraintTop_toTopOf="parent" />
</android.support.constraint.ConstraintLayout>
Activity class
Let's write the code to display the rating of the user.
File: MainActivity.java
package example.javatpoint.com.ratingbar;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RatingBar;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
RatingBar ratingbar;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButtonClick();
}
public void addListenerOnButtonClick(){
ratingbar=(RatingBar)findViewById(R.id.ratingBar);
button=(Button)findViewById(R.id.button);
//Performing action on Button Click
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View arg0) {
//Getting the rating and displaying it on the toast
String rating=String.valueOf(ratingbar.getRating());
Toast.makeText(getApplicationContext(), rating, Toast.LENGTH_LONG).show();
}
});
}
}
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RatingBar;
import android.widget.Toast;
public class MainActivity extends AppCompatActivity {
RatingBar ratingbar;
Button button;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
addListenerOnButtonClick();
}
public void addListenerOnButtonClick(){
ratingbar=(RatingBar)findViewById(R.id.ratingBar);
button=(Button)findViewById(R.id.button);
//Performing action on Button Click
button.setOnClickListener(new View.OnClickListener(){
@Override
public void onClick(View arg0) {
//Getting the rating and displaying it on the toast
String rating=String.valueOf(ratingbar.getRating());
Toast.makeText(getApplicationContext(), rating, Toast.LENGTH_LONG).show();
}
});
}
}
Output:
