Here I have created RatingBar function in android. In android RatingBar can be used to get the rating from the user, it is also used for creating RatingBar. Below code example will described you how to make RatingBar function in Android.
Step(1)- activity_main.xml

<RelativeLayout xmlns:androclass="http://schemas.android.com/apk/res/android"  
    xmlns:tools="http://schemas.android.com/tools"  
    android:layout_width="match_parent"  
    android:layout_height="match_parent"  
    tools:context=".MainActivity" >  

    <RatingBar  
        android:id="@+id/ratingBar1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignParentTop="true"  
        android:layout_centerHorizontal="true"  
        android:layout_marginTop="44dp" />  

    <Button  
        android:id="@+id/button1"  
        android:layout_width="wrap_content"  
        android:layout_height="wrap_content"  
        android:layout_alignLeft="@+id/ratingBar1"  
        android:layout_below="@+id/ratingBar1"  
        android:layout_marginLeft="92dp"  
        android:layout_marginTop="66dp"  
        android:text="submit" />  

</RelativeLayout>  

Step(2)-Activity class-

public class MainActivity extends Activity {  
    RatingBar ratingbar1;  
    Button button;  
    @Override  
    protected void onCreate(Bundle savedInstanceState) {  
        super.onCreate(savedInstanceState);  
        setContentView(R.layout.activity_main);  
        addListenerOnButtonClick();  
    }  

    public void addListenerOnButtonClick(){  
        ratingbar1=(RatingBar)findViewById(R.id.ratingBar1);  
        button=(Button)findViewById(R.id.button1);  
        //Performing action on Button Click  
        button.setOnClickListener(new OnClickListener(){  

            @Override  
            public void onClick(View arg0) { 
                String rating=String.valueOf(ratingbar1.getRating());  
                Toast.makeText(getApplicationContext(), rating, Toast.LENGTH_LONG).show();  
            }  

        });  
    }  
    @Override  
    public boolean onCreateOptionsMenu(Menu menu) { 
        getMenuInflater().inflate(R.menu.activity_main, menu);  
        return true;  
    }  

}