RatingBarの実装

アクティビティ

public class MainActivity extends AppCompatActivity  implements RatingBar.OnRatingBarChangeListener {

    RatingBar mRatingBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        mRatingBar = (RatingBar) findViewById(R.id.rating);
        mRatingBar.setOnRatingBarChangeListener(this);
        //最大星数
        mRatingBar.setNumStars(6);
        // ステップ
        mRatingBar.setStepSize(1);
        // レーティングをセットする
        mRatingBar.setRating(3);
    }

    @Override
    public void onRatingChanged ( RatingBar ratingBar, float rating, boolean fromUser ) {
        Toast.makeText(getApplicationContext(),
                String.valueOf(ratingBar.getRating()), Toast.LENGTH_SHORT).show();
    }

}

xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:id="@+id/activity_main"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="jp.co.araiyusuke.ratingbar.MainActivity">
    <RatingBar
        android:id="@+id/rating"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />
</RelativeLayout>