自定义的星级评分 starBar

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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