Android --RatingBar的使用

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/LL"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"
    android:orientation="vertical" >

    <RatingBar
        android:id="@+id/ratingBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" >
    </RatingBar>

</LinearLayout>

final RatingBar mRating = (RatingBar) findViewById(R.id.ratingBar1); // 获取对象
        mRating.setMax(100); // 设置最大值
        mRating.setNumStars(5); // 设置星型数量
        mRating.setStepSize((float) 0.5); // 设置步长
        mRating.setRating((float) 3.5);
        
        mRating.setOnRatingBarChangeListener(new OnRatingBarChangeListener() {

            @Override
            public void onRatingChanged(RatingBar ratingBar, float rating,
                    boolean fromUser) {
                // TODO Auto-generated method stub
                a = mRating.getRating();// 设置当前分数
                Toast.makeText(firstActivity.this, "当前的分数为：" + a * 20,
                        Toast.LENGTH_SHORT).show();
            }
        });