版权声明：本文为博主原创文章，未经博主允许不得转载。
在Android开发中，我们经常会用到对商家或者商品的评价，运用星星进行打分。然而在Android系统中自带的打分控件，RatingBar特别不好用，间距和大小无法改变。所以，我就自定义了一个特别好用的打分控件。在项目中可以直接使用，特别简单。下面直接上图：
效果图
实现原理
其实就是自定义View继承LinearLayout ，然后里面动态加了五个ImageView。
实现代码，有详细的注释
在attrs中声明的可以在xml中设置的变量
RatingBar源码
import android.content.Context;
import android.content.res.TypedArray;
import android.graphics.drawable.Drawable;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;
import com.kejiang.yuandl.R;
import java.math.BigDecimal;
/**
* Created by dylan on 2015/6/11.
* 自定义打分控件RatingBar
* 可以自定义星星大小和间距
* Correction clickEvent from Xml
*/
public class RatingBar extends LinearLayout {
/**
* 是否可点击
*/
private boolean mClickable;
/**
* 星星总数
*/
private int starCount;
/**
* 星星的点击事件
*/
private OnRatingChangeListener onRatingChangeListener;
/**
* 每个星星的大小
*/
private float starImageSize;
/**
* 每个星星的间距
*/
private float starPadding;
/**
* 星星的显示数量，支持小数点
*/
private float starStep;
/**
* 空白的默认星星图片
*/
private Drawable starEmptyDrawable;
/**
* 选中后的星星填充图片
*/
private Drawable starFillDrawable;
/**
* 半颗星的图片
*/
private Drawable starHalfDrawable;
/**
* 每次点击星星所增加的量是整个还是半个
*/
private StepSize stepSize;
/**
* 设置半星的图片资源文件
*
* @param starHalfDrawable
*/
public void setStarHalfDrawable(Drawable starHalfDrawable) {
this.starHalfDrawable = starHalfDrawable;
}
/**
* 设置满星的图片资源文件
*
* @param starFillDrawable
*/
public void setStarFillDrawable(Drawable starFillDrawable) {
this.starFillDrawable = starFillDrawable;
}
/**
* 设置空白和默认的图片资源文件
*
* @param starEmptyDrawable
*/
public void setStarEmptyDrawable(Drawable starEmptyDrawable) {
this.starEmptyDrawable = starEmptyDrawable;
}
/**
* 设置星星是否可以点击操作
*
* @param clickable
*/
public void setClickable(boolean clickable) {
this.mClickable = clickable;
}
/**
* 设置星星点击事件
*
* @param onRatingChangeListener
*/
public void setOnRatingChangeListener(OnRatingChangeListener onRatingChangeListener) {
this.onRatingChangeListener = onRatingChangeListener;
}
/**
* 设置星星的大小
*
* @param starImageSize
*/
public void setStarImageSize(float starImageSize) {
this.starImageSize = starImageSize;
}
public void setStepSize(StepSize stepSize) {
this.stepSize = stepSize;
}
/**
* 构造函数
* 获取xml中设置的资源文件
*
* @param context
* @param attrs
*/
public RatingBar(Context context, AttributeSet attrs) {
super(context, attrs);
setOrientation(LinearLayout.HORIZONTAL);
TypedArray mTypedArray = context.obtainStyledAttributes(attrs, R.styleable.RatingBar);
starImageSize = mTypedArray.getDimension(R.styleable.RatingBar_starImageSize, 20);
starPadding = mTypedArray.getDimension(R.styleable.RatingBar_starPadding, 10);
starStep = mTypedArray.getFloat(R.styleable.RatingBar_starStep, 1.0f);
stepSize = StepSize.fromStep(mTypedArray.getInt(R.styleable.RatingBar_stepSize, 1));
starCount = mTypedArray.getInteger(R.styleable.RatingBar_starCount, 5);
starEmptyDrawable = mTypedArray.getDrawable(R.styleable.RatingBar_starEmpty);
starFillDrawable = mTypedArray.getDrawable(R.styleable.RatingBar_starFill);
starHalfDrawable = mTypedArray.getDrawable(R.styleable.RatingBar_starHalf);
mClickable = mTypedArray.getBoolean(R.styleable.RatingBar_clickable, true);
mTypedArray.recycle();
for (int i = 0; i < starCount; ++i) {
final ImageView imageView = getStarImageView();
imageView.setImageDrawable(starEmptyDrawable);
imageView.setOnClickListener(
new OnClickListener() {
@Override
public void onClick(View v) {
if (mClickable) {
int fint = (int) starStep;
BigDecimal b1 = new BigDecimal(Float.toString(starStep));
BigDecimal b2 = new BigDecimal(Integer.toString(fint));
float fPoint = b1.subtract(b2).floatValue();
if (fPoint == 0) {
fint -= 1;
}
if (indexOfChild(v) > fint) {
setStar(indexOfChild(v) + 1);
} else if (indexOfChild(v) == fint) {
if (stepSize == StepSize.Full) {
return;
}
if (imageView.getDrawable().getCurrent().getConstantState().equals(starHalfDrawable.getConstantState())) {
setStar(indexOfChild(v) + 1);
} else {
setStar(indexOfChild(v) + 0.5f);
}
} else {
setStar(indexOfChild(v) + 1f);
}
}
}
}
);
addView(imageView);
}
setStar(starStep);
}
/**
* 设置每颗星星的参数
*
* @return
*/
private ImageView getStarImageView() {
ImageView imageView = new ImageView(getContext());
LinearLayout.LayoutParams layout = new LinearLayout.LayoutParams(
Math.round(starImageSize), Math.round(starImageSize));
layout.setMargins(0, 0, Math.round(starPadding), 0);
imageView.setLayoutParams(layout);
imageView.setAdjustViewBounds(true);
imageView.setScaleType(ImageView.ScaleType.CENTER_CROP);
imageView.setImageDrawable(starEmptyDrawable);
imageView.setMinimumWidth(10);
imageView.setMaxHeight(10);
return imageView;
}
/**
* 设置星星的个数
*
* @param rating
*/
public void setStar(float rating) {
if (onRatingChangeListener != null) {
onRatingChangeListener.onRatingChange(rating);
}
this.starStep = rating;
int fint = (int) rating;
BigDecimal b1 = new BigDecimal(Float.toString(rating));
BigDecimal b2 = new BigDecimal(Integer.toString(fint));
float fPoint = b1.subtract(b2).floatValue();
for (int i = 0; i < fint; ++i) {
((ImageView) getChildAt(i)).setImageDrawable(starFillDrawable);
}
for (int i = fint; i < starCount; i++) {
((ImageView) getChildAt(i)).setImageDrawable(starEmptyDrawable);
}
if (fPoint > 0) {
((ImageView) getChildAt(fint)).setImageDrawable(starHalfDrawable);
}
}
/**
* 操作星星的点击事件
*/
public interface OnRatingChangeListener {
/**
* 选中的星星的个数
*
* @param RatingCount
*/
void onRatingChange(float ratingCount);
}
/**
* 星星每次增加的方式整星还是半星，枚举类型
* 类似于View.GONE
*/
public enum StepSize {
Half(0), Full(1);
int step;
StepSize(int step) {
this.step = step;
}
public static StepSize fromStep(int step) {
for (StepSize f : values()) {
if (f.step == step) {
return f;
}
}
throw new IllegalArgumentException();
}
}
}在xml中的用法
RatingBar ratingBar= (RatingBar) findViewById(R.id.rb); ratingBar.setClickable(true); ratingBar.setStar(2.5f); ratingBar.setStepSize(RatingBar.StepSize.Half); ratingBar.setOnRatingChangeListener(new RatingBar.OnRatingChangeListener() { @Override public void onRatingChange(float ratingCount) { Log.d("RatingBar","RatingBar-Count="+ratingCount); } });
我的同类文章
Android（51） Android自定义Vew（6）
