image.png

目录

RatingBar

Android开发中，时不时的就有要实现星星的评分效果，比如某宝，某团，相信大家也都见过，它就是RatingBar。

RatingBar继承ProgressBar，除了ProgressBar的属性外还有特有属性.

使用代码:

    <RatingBar
        android:id="@+id/ratingBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="5"
        android:rating="3.5"/>

效果图:

image.png

使用实例

使用星际评分条来修改图片的透明度.
activity_main.xml文件:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">


    <ImageView
        android:id="@+id/imageView1"
        android:layout_width="400dp"
        android:layout_height="400dp"
        android:src="@drawable/ppp" />

    <RatingBar
        android:id="@+id/ratingBar1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:numStars="5"
        android:rating="3.5"/>

</android.support.constraint.ConstraintLayout>

代码实现:

package com.example.user.ratingbar;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.RatingBar;
import android.widget.ImageView;

public class MainActivity extends AppCompatActivity {
    private ImageView imageView;
    private RatingBar ratingBar;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        imageView=(ImageView)findViewById(R.id.imageView1);
        ratingBar=(RatingBar)findViewById(R.id.ratingBar1);

        // 设定显示为最大值
        ratingBar.setRating(5);

        ratingBar.setOnRatingBarChangeListener(new RatingBar.OnRatingBarChangeListener() {
            @Override
            public void onRatingChanged(RatingBar ratingBar, float rating, boolean fromUser) {
                // 设置图片的透明度
                imageView.setImageAlpha((int)(255*rating/5));
            }
        });
    }
}

执行效果:

image.png

image.png

参考

Android星级评分条控件RatingBar
Android基础控件RatingBar星级评分条的使用