Android控件之-------RatingBar(学习笔记)

--------------------RatingBar用于评定星级,作为对某软件或者产品打分的表现形式出现--------

------具体用法在XML文件中-------------------

-------------------------XML代码-----------------------------------------

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"
android:orientation="vertical"
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="com.example.example21.MainActivity">

    <TextView
android:id="@+id/text_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:textSize="20dp"
android:text="请选择" />
    <!--android:numStars设定星星的个数
    android:stepSize设置每次要改变的星级
    android:progressTint用于设置星星的颜色
    android:rating用于默认星级(默认为1的话,打开程序就有一个星级已被选定
    android:isIndicator用于设置是否允许用户改变)-->
<RatingBar
android:id="@+id/rating_bar"
android:layout_width="wrap_content"
android:numStars="5"
android:stepSize="1"
android:rating="2"
android:isIndicator="false"
android:progressTint="#e9cc10"
android:isScrollContainer="true"
android:layout_height="wrap_content" />
</LinearLayout>

----------------------------------MainActivity代码--------------------------------------

package com.example.example21;

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

import static android.widget.RatingBar.*;

public class MainActivity extends AppCompatActivity {
    TextView    textView;
    RatingBar   rBar;
    @Override
protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        textView=(TextView)this.findViewById(R.id.text_view);
        rBar=(RatingBar)this.findViewById(R.id.rating_bar);
        rBar.setOnRatingBarChangeListener(new OnRatingBarChangeListener(){
            @Override
public void onRatingChanged(RatingBar ratingBar, float v, boolean b) {
                textView.setText("您的打分为:"+(float)rBar.getRating()+"分");
            }
        });
    }
}