自定义RatingBar控件，实现可自定义星星（或项目所需图片）的宽高，告别使用warp_content导致控件大小不可控

之前做过的一款app中涉及到RatingBar控件，基本上来说都会要求用图片来替代，
即使同样是星星（可能是觉得系统自带的比较丑吧，不过我觉得还好啊）。
当时就觉得很难去做适配，UI给的图片没法去控制宽高，只能使用warp_content来做，
可是这样会导致控件很大，即使是用了maxHeight和minHeight来控制，这只是控制了RatingBar的宽高，
对于RatingBar里的子控件（姑且这么说吧，有知道的可以告诉我）是没有效果的。
当时想着自定义来解决，后来项目要求不是那么严格吧，就没有处理。如果还是那么做的话会超出屏幕范围，
没办法，只能自己搞定咯。

这是自定义控件

package com.lg.customstarview;

import android.content.Context;
import android.content.res.TypedArray;
import android.util.AttributeSet;
import android.view.View;
import android.widget.ImageView;
import android.widget.LinearLayout;

/**
* 简单实现星级评选控件：内部填充多个ImageView
* 继承LinearLayout 设置水平方向
*/
public class CustomStarView extends LinearLayout {
private int mImageWidth = 20;  //图片设置默认的宽度
private int mImageHeight = 20; //图片设置默认的高度
private int mDefaultImageId = R.mipmap.ic_launcher;
private int mClickImageId = R.mipmap.ic_launcher;
private int mMargin = 5;   //图片之间默认的margin
private int mStarNum = 5;  //星星默认的个数
private int mStarChoose = 3;  //默认默认是三颗星
private boolean isClick = true;

private OnStarItemClickListener mStarItemClickListener;

public CustomStarView(Context context, AttributeSet attrs) {
super(context, attrs);
initData(context, attrs);
}

public CustomStarView(Context context, AttributeSet attrs, int defStyleAttr) {
super(context, attrs, defStyleAttr);
initData(context, attrs);
}

/**
* 初始化数据
*
* @param context
* @param attrs
*/
private void initData(Context context, AttributeSet attrs) {
this.setOrientation(HORIZONTAL);  //设置水平
TypedArray a = context.getTheme().obtainStyledAttributes(attrs,
R.styleable.StarView, 0, 0);
int n = a.getIndexCount();

for (int i = 0; i < n; i++) {
int attr = a.getIndex(i);
switch (attr) {
case R.styleable.StarView_mImageWidth:

d4ef
mImageWidth = (int) a.getDimension(attr, mImageWidth);
break;
case R.styleable.StarView_mImageHeight:
mImageHeight = (int) a.getDimension(attr, mImageHeight);
break;
case R.styleable.StarView_mDefaultImageId:
mDefaultImageId = a.getResourceId(attr, mDefaultImageId);
break;
case R.styleable.StarView_mClickImageId:
mClickImageId = a.getResourceId(attr, mClickImageId);
break;
case R.styleable.StarView_mMargin:
mMargin = (int) a.getDimension(attr, mMargin);
break;
case R.styleable.StarView_mStarNum:
mStarNum = a.getInt(attr, mStarNum);
break;
case R.styleable.StarView_mStarChoose:
mStarChoose = a.getInt(attr, mStarChoose);
break;
}
}
a.recycle();

}

@Override
protected void onFinishInflate() {
super.onFinishInflate();
setStarNum(mStarNum);  //设置个数
}

/**
* 设置星星数量
* 调用该方法可以手动设置星星数量
* @param number
*/
public void setStarNum(int number) {
//        if (number <= 0) {
//            try {
//                throw new Exception("设置的数据不能小于等于零");
//            } catch (Exception e) {
//                e.printStackTrace();
//            }
//        }
this.removeAllViews(); //清空所有view
if(number == 0){
for (int i = 0; i < 5; i++) {
ImageView imageView = new ImageView(getContext());
final LayoutParams layoutParams = new LayoutParams(mImageWidth, mImageHeight);
layoutParams.leftMargin = mMargin;
layoutParams.rightMargin = mMargin;
imageView.setLayoutParams(layoutParams);
this.addView(imageView);
imageView.setImageResource(mDefaultImageId);
//                setStarOnClick(imageView, i);
}
}else {
for (int i = 0; i < number; i++) {
ImageView imageView = new ImageView(getContext());
final LayoutParams layoutParams = new LayoutParams(mImageWidth, mImageHeight);
layoutParams.leftMargin = mMargin;
layoutParams.rightMargin = mMargin;
imageView.setLayoutParams(layoutParams);
this.addView(imageView);
imageView.setImageResource(mDefaultImageId);
//                setStarOnClick(imageView, i);
}
setCurrentChoose(mStarChoose);  //设置当前选择
}
}

/**
* 设置点击事件
*
* @param imageView
* @param i
*/
private void setStarOnClick(final ImageView imageView, final int i) {
if (imageView != null) {
imageView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View view) {
resetDefaultImage();
setCurrentChoose(i+1);
if (mStarItemClickListener != null) {
mStarItemClickListener.onItemClick(imageView, i);
}
}
});
}
}

/**
* 设置当前选择
*
* @param index
*/
private void setCurrentChoose(int index) {
if(isClick){
for (int i = 0; i < index; i++) {
ImageView imageView = (ImageView) getChildAt(i);
imageView.setImageResource(mClickImageId);
}
}
}

/**
* 重置默认为默认的图片
*/
private void resetDefaultImage() {
int cNum = getChildCount();
for (int i = 0; i < cNum; i++) {
ImageView imageView = (ImageView) getChildAt(i);
imageView.setImageResource(mDefaultImageId);
}
}

public int getImageWidth() {
return mImageWidth;
}

public void setImageWidth(int mImageWidht) {
this.mImageWidth = mImageWidht;
}

public int getImageHeight() {
return mImageHeight;
}

public void setImageHeight(int mImageHeight) {
this.mImageHeight = mImageHeight;
}

public int getDefaultImageId() {
return mDefaultImageId;
}

public void setDefaultImageId(int resouceId) {
this.mDefaultImageId = mDefaultImageId;
}

public int getClickImageId() {
return mClickImageId;
}

public void setClickImageId(int mClickImageId) {
this.mClickImageId = mClickImageId;
}

public OnStarItemClickListener getStarItemClickListener() {
return mStarItemClickListener;
}

public void setmStarItemClickListener(OnStarItemClickListener mStarItemClickListener) {
this.mStarItemClickListener = mStarItemClickListener;
}

/**
* 星星点击事件
*/
public interface OnStarItemClickListener {
public void onItemClick(View view, int pos);
}
}`

自定义空间设计到的style，放在styles目录下即可

<!--自定星级控件-->
<declare-styleable name="StarView">
<attr name="mImageWidth" format="dimension"/>
<attr name="mImageHeight" format="dimension" />
<attr name="mDefaultImageId" format="reference" />
<attr name="mClickImageId" format="reference" />
<attr name="mMargin" format="dimension" />
<attr name="mStarNum" format="integer" />
<attr name="mStarChoose" format="integer" />
</declare-styleable>

布局文件在这里

<com.lg.customstarview.CustomStarView
android:layout_alignParentRight="true"
android:layout_marginLeft="5dp"
android:layout_marginRight="10dp"
android:id="@+id/start_view"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
fresco:mClickImageId="@drawable/medal_selected"
fresco:mDefaultImageId="@drawable/medal"
fresco:mImageHeight="20dp"
fresco:mImageWidth="20dp"
fresco:mMargin="2dp"
fresco:mStarChoose="3"
fresco:mStarNum="5" />