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:
                    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" />

好了，大概就是这样了，简单的源码链接 http://download.csdn.net/download/alwaysgoalong/9896943