自定义的星级评分 starBar

最新推荐文章于 2023-01-17 15:45:41 发布

原创最新推荐文章于 2023-01-17 15:45:41 发布 · 2.8k 阅读

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#Android #starBar #星级评分

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本文介绍了一种自定义StarBar评分控件的实现方法，该控件支持自定义星星数量、大小、间距等属性，并提供了触摸交互及评分变化监听功能。

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样式图：

StarBar类：

package com.lym.starbar2;

import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.BitmapShader;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.MotionEvent;
import android.view.View;

/**
 * Created by DMing on 2016/7/18.
 *
 */
public class StarBar extends View{
    private int starDistance = 0; //星星间距
    private int starCount = 5;  //星星个数
    private int starSize;     //星星高度大小，星星一般正方形，宽度等于高度
    private float starMark = 0.0F;   //评分星星
    private Bitmap starFillBitmap; //亮星星
    private Drawable starEmptyDrawable; //暗星星
    private OnStarChangeListener onStarChangeListener;//监听星星变化接口
    private Paint paint;         //绘制星星画笔
    private boolean integerMark = false;
    public StarBar(Context context, AttributeSet attrs) {
        super(context, attrs);
        init(context, attrs);
    }

    public StarBar(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init(context, attrs);
    }

    /**
     * 初始化UI组件
     *
     * @param context
     * @param attrs
     */
    private void init(Context context, AttributeSet attrs){
        setClickable(true);
        TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RatingBar);
        this.starDistance = (int) mTypedArray.getDimension(R.styleable.RatingBar_starDistance, 0);
        this.starSize = (int) mTypedArray.getDimension(R.styleable.RatingBar_starSize, 20);
        this.starCount = mTypedArray.getInteger(R.styleable.RatingBar_starCount, 5);
        this.starEmptyDrawable = mTypedArray.getDrawable(R.styleable.RatingBar_starEmpty);
        this.starFillBitmap =  drawableToBitmap(mTypedArray.getDrawable(R.styleable.RatingBar_starFill));
        mTypedArray.recycle();

        paint = new Paint();
        paint.setAntiAlias(true);
        paint.setShader(new BitmapShader(starFillBitmap, BitmapShader.TileMode.CLAMP, BitmapShader.TileMode.CLAMP));
    }

    /**
     * 设置是否需要整数评分
     * @param integerMark
     */
    public void setIntegerMark(boolean integerMark){
        this.integerMark = integerMark;
    }

    /**
     * 设置显示的星星的分数
     *
     * @param mark
     */
    public void setStarMark(float mark){
        if (integerMark) {
            starMark = (int)Math.ceil(mark);
        }else {
            starMark = Math.round(mark * 10) * 1.0f / 10;
        }
        if (this.onStarChangeListener != null) {
            this.onStarChangeListener.onStarChange(starMark);  //调用监听接口
        }
        invalidate();
    }

    /**
     * 获取显示星星的数目
     *
     * @return starMark
     */
    public float getStarMark(){
        return starMark;
    }


    /**
     * 定义星星点击的监听接口
     */
    public interface OnStarChangeListener {
        void onStarChange(float mark);
    }

    /**
     * 设置监听
     * @param onStarChangeListener
     */
    public void setOnStarChangeListener(OnStarChangeListener onStarChangeListener){
        this.onStarChangeListener = onStarChangeListener;
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        setMeasuredDimension(starSize * starCount + starDistance * (starCount - 1), starSize);
    }

    @Override
    protected void onDraw(Canvas canvas) {
        super.onDraw(canvas);
        if (starFillBitmap == null || starEmptyDrawable == null) {
            return;
        }
        for (int i = 0;i < starCount;i++) {
            starEmptyDrawable.setBounds((starDistance + starSize) * i, 0, (starDistance + starSize) * i + starSize, starSize);
            starEmptyDrawable.draw(canvas);
        }
        if (starMark > 1) {
            canvas.drawRect(0, 0, starSize, starSize, paint);
            if(starMark-(int)(starMark) == 0) {
                for (int i = 1; i < starMark; i++) {
                    canvas.translate(starDistance + starSize, 0);
                    canvas.drawRect(0, 0, starSize, starSize, paint);
                }
            }else {
                for (int i = 1; i < starMark - 1; i++) {
                    canvas.translate(starDistance + starSize, 0);
                    canvas.drawRect(0, 0, starSize, starSize, paint);
                }
                canvas.translate(starDistance + starSize, 0);
                canvas.drawRect(0, 0, starSize * (Math.round((starMark - (int) (starMark))*10)*1.0f/10), starSize, paint);
            }
        }else {
            canvas.drawRect(0, 0, starSize * starMark, starSize, paint);
        }
    }


    @Override
    public boolean onTouchEvent(MotionEvent event) {
        int x = (int) event.getX();
        if (x < 0) x = 0;
        if (x > getMeasuredWidth()) x = getMeasuredWidth();
        switch(event.getAction()){
            case MotionEvent.ACTION_DOWN: {
                setStarMark(x*1.0f / (getMeasuredWidth()*1.0f/starCount));
                break;
            }
            case MotionEvent.ACTION_MOVE: {
                setStarMark(x*1.0f / (getMeasuredWidth()*1.0f/starCount));
                break;
            }
            case MotionEvent.ACTION_UP: {
                break;
            }
        }
        invalidate();
        return super.onTouchEvent(event);
    }

    /**
     * drawable转bitmap
     *
     * @param drawable
     * @return
     */
    private Bitmap drawableToBitmap(Drawable drawable)
    {
        if (drawable == null)return null;
        Bitmap bitmap = Bitmap.createBitmap(starSize, starSize, Bitmap.Config.ARGB_8888);
        Canvas canvas = new Canvas(bitmap);
        drawable.setBounds(0, 0, starSize, starSize);
        drawable.draw(canvas);
        return bitmap;
    }
}

attrs.xml:

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <declare-styleable name="RatingBar">

        <!-- 星星间距 -->
        <attr name="starDistance" format="dimension" />
        <!-- 星星大小 -->
        <attr name="starSize" format="dimension" />
        <!-- 星星个数 -->
        <attr name="starCount" format="integer" />
        <!-- 星星空图 -->
        <attr name="starEmpty" format="reference" />
        <!-- 星星满图 -->
        <attr name="starFill" format="reference" />
    </declare-styleable>

</resources>

test.xml文件（页面文件）

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:RatingBar="http://schemas.android.com/apk/res/com.lym.starbar2"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:padding="10dp" >

    <com.lym.starbar2.StarBar
        android:id="@+id/starBar"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        RatingBar:starCount="5"
        RatingBar:starDistance="10dp"
        RatingBar:starEmpty="@drawable/star_gray"
        RatingBar:starFill="@drawable/star_yellow"
        RatingBar:starSize="30dp" />

</LinearLayout>

如果引用控件报错，可以在所在布局里面加上下面的代码

xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:RatingBar="http://schemas.android.com/apk/res-auto"

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