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Android : RatingBar

Tutorial by:      Date: 2016-05-10 05:03:12

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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
 
  1. <RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
  2.     xmlns:tools="http://schemas.android.com/tools"  
  3.     android:layout_width="match_parent"  
  4.     android:layout_height="match_parent"  
  5.     tools:context=".MainActivity" >  
  6.   
  7.     <RatingBar  
  8.         android:id="@+id/ratingBar1"  
  9.         android:layout_width="wrap_content"  
  10.         android:layout_height="wrap_content"  
  11.         android:layout_alignParentTop="true"  
  12.         android:layout_centerHorizontal="true"  
  13.         android:layout_marginTop="44dp" />  
  14.   
  15.     <Button  
  16.         android:id="@+id/button1"  
  17.         android:layout_width="wrap_content"  
  18.         android:layout_height="wrap_content"  
  19.         android:layout_alignLeft="@+id/ratingBar1"  
  20.         android:layout_below="@+id/ratingBar1"  
  21.         android:layout_marginLeft="92dp"  
  22.         android:layout_marginTop="66dp"  
  23.         android:text="submit" />  
  24.   
  25. </RelativeLayout>  

Activity class

Let's write the code to display the rating of the user.

File: MainActivity.java
 
  1. package com.example.rating;  
  2.   
  3. import android.os.Bundle;  
  4. import android.app.Activity;  
  5. import android.view.Menu;  
  6. import android.view.View;  
  7. import android.view.View.OnClickListener;  
  8. import android.widget.Button;  
  9. import android.widget.RatingBar;  
  10. import android.widget.Toast;  
  11.   
  12. public class MainActivity extends Activity {  
  13.     RatingBar ratingbar1;  
  14.     Button button;  
  15.     @Override  
  16.     protected void onCreate(Bundle savedInstanceState) {  
  17.         super.onCreate(savedInstanceState);  
  18.         setContentView(R.layout.activity_main);  
  19.         addListenerOnButtonClick();  
  20.     }  
  21.   
  22.     public void addListenerOnButtonClick(){  
  23.         ratingbar1=(RatingBar)findViewById(R.id.ratingBar1);  
  24.         button=(Button)findViewById(R.id.button1);  
  25.         //Performing action on Button Click  
  26.         button.setOnClickListener(new OnClickListener(){  
  27.   
  28.             @Override  
  29.             public void onClick(View arg0) {  
  30.                 //Getting the rating and displaying it on the toast  
  31.                 String rating=String.valueOf(ratingbar1.getRating());  
  32.                 Toast.makeText(getApplicationContext(), rating, Toast.LENGTH_LONG).show();  
  33.             }  
  34.               
  35.         });  
  36.     }  
  37.     @Override  
  38.     public boolean onCreateOptionsMenu(Menu menu) {  
  39.         // Inflate the menu; this adds items to the action bar if it is present.  
  40.         getMenuInflater().inflate(R.menu.activity_main, menu);  
  41.         return true;  
  42.     }  
  43.   

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