[Android] RatingBar

activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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:orientation="vertical"
    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"/>
    <RatingBar
        android:id="@+id/ratingBar2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        style="?android:attr/ratingBarStyleSmall"
        android:stepSize="1"
        android:numStars="10"/>
    <RatingBar
        android:id="@+id/ratingBar3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:rating="1.5"
        style="?android:attr/ratingBarStyleIndicator"/>
    <Button
        android:id="@+id/btnInc"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:backgroundTint="#50000000"
        android:textColor="@color/black"
        android:text="증가시키기"/>
    <Button
        android:id="@+id/btnDec"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:backgroundTint="#50000000"
        android:textColor="@color/black"
        android:text="감소시키기"/>
</LinearLayout>

MainActivity.java

package com.example.ratingbar;

import androidx.appcompat.app.AppCompatActivity;

import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.RatingBar;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        final RatingBar rating1, rating2, rating3;
        Button btnInc, btnDec;
        
        rating1 = (RatingBar) findViewById(R.id.ratingBar1);
        rating2 = (RatingBar) findViewById(R.id.ratingBar2);
        rating3 = (RatingBar) findViewById(R.id.ratingBar3);
        btnInc = (Button) findViewById(R.id.btnInc);
        btnDec = (Button) findViewById(R.id.btnDec);
        
        btnInc.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                rating1.setRating(rating1.getRating()+rating1.getStepSize());
                rating2.setRating(rating2.getRating()+rating2.getStepSize());
                rating3.setRating(rating3.getRating()+rating3.getStepSize());
            }
        });
        btnDec.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                rating1.setRating(rating1.getRating()-rating1.getStepSize());
                rating2.setRating(rating2.getRating()-rating2.getStepSize());
                rating3.setRating(rating3.getRating()-rating3.getStepSize());
            }
        });
    }
}

 

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