之前有使用系统的RatingBar,发现不太灵活
于是自己写一个
原理图
首先得有两张评星的图,找ui妹子切一下
为了方便定制,我这里写死了宽高 即整个控件的高度就是星星的高度
整体控件宽高按照需求写死
我们还需要几个自定义属性,才能将整个RatingBar绘制出来
padding值 即每个星星之间的距离,我这里五颗星星是居中排版
所以在设置参数时还是需要小小的计算的
每个星星之间的padding值
星星的总颗数
点亮的星星的颗数
点亮星星的样式
默认未点亮星星的样式
res/values/attrs
<resources>
<declare-styleable name="StarIndicator" >
<attr name="indicator_icon_chose" format="reference"/>
<attr name="indicator_icon_normal" format="reference"/>
<attr name="indicator_margin_left" format="dimension" />
<attr name="indicator_star_size" format="integer" />
<attr name="indicator_star_chose" format="integer"/>
declare-styleable>
resources>
这里的margin_left 就是上面的星星之间的距离padding
xml
.chonghao.evaluatestardemo.widget.StarIndicator
android:id="@+id/star"
android:layout_width="200dp" //写死整个View宽度
android:layout_height="28dp" //写死整个View高度,也是星星高度
android:layout_gravity="center_vertical"
app:indicator_icon_chose="@mipmap/home_star_pre" //选中星星图片
app:indicator_icon_normal="@mipmap/home_star_nor" //未选中星星图片
app:indicator_margin_left="10dp" //星星间距
app:indicator_star_chose="5" //选中星星个数
app:indicator_star_size="5"/> //星星总个数
自定义View StarIndicator
package com.chonghao.evaluatestardemo.widget;
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.Bitmap;
import android.graphics.Canvas;
import android.graphics.Paint;
import android.graphics.RectF;
import android.graphics.drawable.BitmapDrawable;
import android.support.annotation.Nullable;
import android.util.AttributeSet;
import android.util.Log;
import android.view.MotionEvent;
import android.view.View;
import com.chonghao.evaluatestardemo.R;
import java.util.ArrayList;
import java.util.List;
/** * Created by ccb on 2017/8/29. * 评分指示器 自定义控件 */
public class StarIndicator extends View {
/** * 选择的星星 的bitmap */
private Bitmap drawable_chose;
/** * 非选择的星星 的bitmap */
private Bitmap drawable_normal;
/** * 星星总颗数 的bitmap */
private int mStarNumber;
/** * 选择的星星颗数 的bitmap */
private int mChoseNumber;
/** * 邻近星星之间的padding值 */
private float mPaddingLeft;
/** * 整个View的高度 */
private int mHeight;
/** * 整个View的宽度 */
private int mWidth;
/** * 画笔 */
private Paint mPaint;
/** * 最左侧星星距离左边界的距离 */
private float mLeft0;
/** * 每个星星定位点 点集合 */
private List mPointList;
/** * 星星点击事件回调 */
private StarChoseListener mStarChoseListener;
public void setStarChoseListener(StarChoseListener starChoseListener) {
mStarChoseListener = starChoseListener;
}
public interface StarChoseListener {
void choseNumber(int num);
}
public StarIndicator(Context context) {
this(context, null);
}
public StarIndicator(Context context, @Nullable AttributeSet attrs) {
this(context, attrs, 0);
}
public StarIndicator(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
TypedArray a = context.obtainStyledAttributes(attrs, R.styleable.StarIndicator, defStyleAttr, 0);
//获取选中图片
BitmapDrawable drawable = (BitmapDrawable) a.getDrawable(R.styleable.StarIndicator_indicator_icon_chose);
drawable_chose = drawable.getBitmap();
//获取选中图片
BitmapDrawable drawable1 = (BitmapDrawable) a.getDrawable(R.styleable.StarIndicator_indicator_icon_normal);
drawable_normal = drawable1.getBitmap();
//获取star个数
mStarNumber = a.getInteger(R.styleable.StarIndicator_indicator_star_size, 5);
//选中个数
mChoseNumber = a.getInteger(R.styleable.StarIndicator_indicator_star_chose, 5);
//获取 间隙
mPaddingLeft = a.getDimension(R.styleable.StarIndicator_indicator_margin_left, 5);
//回收
a.recycle();
initPaint();
Log.d("tag",
mStarNumber + "mStarNumber" +
mChoseNumber + "mChoseNumber" +
mPaddingLeft + "mPaddingLeft" +
drawable_chose + "drawable_chose" +
drawable_normal + "drawable_normal"
);
}
private void initPaint() {
//获取xml中的属性
//初始化paint,初始化一些其他内容
mPaint = new Paint();
mPaint.setAntiAlias(true);
}
@Override
protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
super.onMeasure(widthMeasureSpec, heightMeasureSpec);
mHeight = getMeasuredHeight();
mWidth = getMeasuredWidth();
Log.d("tag", "mHeight" + mHeight
+ "mWidth" + mWidth
);
//测量控件宽高
//计算文字宽高
mLeft0 = (mWidth - mStarNumber * mHeight - mPaddingLeft * (mStarNumber - 1)) * 0.5f;
mPointList = new ArrayList<>();
for (int i = 0; i < mStarNumber; i++) {
float left = mLeft0 + i * (mPaddingLeft + mHeight);
mPointList.add(new RectF(left, 0, left + mHeight, mHeight));
}
}
@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
//画icon
for (int i = 0; i < mPointList.size(); i++) {
if (i < mChoseNumber) {
canvas.drawBitmap(drawable_chose, null, mPointList.get(i), mPaint);
} else {
canvas.drawBitmap(drawable_normal, null, mPointList.get(i), mPaint);
}
}
}
public void setChoseNumber(int choseNumber) {
mChoseNumber = choseNumber;
postInvalidate();
}
@Override
public boolean onTouchEvent(MotionEvent event) {
switch (event.getAction()) {
case MotionEvent.ACTION_DOWN:
break;
case MotionEvent.ACTION_MOVE:
case MotionEvent.ACTION_UP:
float x = event.getX();
if (x > mWidth) {
x = mWidth;
}
if (x < 0) {
x = 0;
}
int a;
if (x <= mLeft0) {//最左侧
setChoseNumber(a = 0);
} else if (x >= (mWidth - mLeft0)) {//最右侧 有多少颗 亮多少颗
a = mStarNumber;
setChoseNumber(mStarNumber);
} else {
a = (int) ((x - mLeft0) / (mHeight + mPaddingLeft) + 1);
setChoseNumber(a);
}
if (mStarChoseListener != null) {
mStarChoseListener.choseNumber(a);
}
break;
}
return true;
}
}
MainActivity
StarIndicator star = (StarIndicator) findViewById(R.id.star);
star.setChoseNumber(3); //设置选中个数
//设置监听
star.setStarChoseListener(new StarIndicator.StarChoseListener() {
@Override
public void choseNumber(int num) {
showToast(num + "");
}
});
好了 做起来还是很简单的!