RatingBar Android App Using Android Studio

Introduction

Android RatingBar can be used to get a 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. In this article, I will show you how to create a RatingBar Android App using Android Studio.

Requirements

• Android Studio version 2.3.3
• Little bit XML and JAVA knowledge.
• Android Emulator (or) Android mobile
• Download link (Android Studio)

Important Points to Remember

The getRating() method of Android RatingBar class returns the rating number.

Create New Project

Open Android Studio and create a New Android Studio Project.

activity_main.xml

Drag the RatingBar and Button from the palette now the activity_main.xml file will look like this,

<RelativeLayout
    xmlns:android="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>

Activity class

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

MainActivity.java

The Header File

package abu.ratingbar;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.Button;
import android.widget.RatingBar;
import android.widget.Toast;

Declare the Button with Rating Bar,

 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);

        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;
    }

}

Debug The Error

Now, go to the menu bar and click make project or press ctrl+f9 to debug the error.



Run the project

Then click Run button or press shift+f10 To run the project. And choose the virtual machine and click OK.

Output

We have successfully created a RatingBar Android application using Android Studio.