Android自定义ViewGroup实现选择面板

/**
 * create by lijianhui
 * on 2022-7-6
 * <p>
 * description: 自定义标签选择面板
 */
public class TagSelectView extends ViewGroup implements View.OnClickListener {
    private int mMaxWidth;
    private int mHorizontalSpace = DensityUtil.dp2px(5);
    private int mVerticalSpace = DensityUtil.dp2px(10);
    private List<RowTag> mRows = new ArrayList<>();
    private TagClickCallback mTagClickCallback;
    private int mTitleHeight;
    private boolean mUpdateTabState = true;
    public TagSelectView(@NonNull Context context) {
        super(context);
    }
    public TagSelectView(@NonNull Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }
    public TagSelectView(@NonNull Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
    }
    /**
     * 测量宽高
     */
    @SuppressLint("DrawAllocation")
    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        mRows.clear();
        // 获取总宽度
        int width = MeasureSpec.getSize(widthMeasureSpec);
        mMaxWidth = width - getPaddingStart() - getPaddingEnd();
        //测量子view
        int childCount = this.getChildCount();
        RowTag currentLine = null;
        for (int i = mTitleHeight > 0 ? 1 : 0; i < childCount; i++) {
            View childView = getChildAt(i);
            childView.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
            childView.setOnClickListener(this);
            if (currentLine == null) {
                currentLine = new RowTag(mMaxWidth, mHorizontalSpace);
                currentLine.addTagView(childView);
                mRows.add(currentLine);
            } else {
                if (currentLine.canAddView(childView)) {
                    currentLine.addTagView(childView);
                } else {
                    currentLine = new RowTag(mMaxWidth, mHorizontalSpace);
                    currentLine.addTagView(childView);
                    mRows.add(currentLine);
                }
            }
        }
        //测量自己
        int height = getPaddingTop() + getPaddingBottom();
        for (int i = 0; i < mRows.size(); i++) {
            height += mRows.get(i).mHeight;
        }
        height += (mRows.size() - 1) * mVerticalSpace;
        height += mTitleHeight;
        setMeasuredDimension(width, height);
    }
    /**
     * 布局子view
     */
    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        left = getPaddingStart();
        top = getPaddingTop() + mTitleHeight;
        for (int i = 0; i < mRows.size(); i++) {
            // 获取行
            RowTag line = mRows.get(i);
            // 管理
            line.layoutView(top, left);
            // 更新高度
            top += line.mHeight;
            if (i != mRows.size() - 1) {
                top += mVerticalSpace;
            }
        }
    }
    /**
     * 添加标题
     *
     * @param view 标题
     */
    public void addTitleView(View view) {
        view.measure(MeasureSpec.UNSPECIFIED, MeasureSpec.UNSPECIFIED);
        mTitleHeight = view.getMeasuredHeight() + DensityUtil.dp2px(15);
        view.layout(0, 0, view.getMeasuredWidth(), view.getMeasuredHeight());
        addView(view);
    }
    /**
     * 标签被点击
     *
     * @param v 点击的标签
     */
    @Override
    public void onClick(View v) {
        if (mUpdateTabState) {
            v.setSelected(!v.isSelected());
        }
        if (mTagClickCallback != null) {
            mTagClickCallback.tagClick(v);
        }
    }
    /**
     * 设置标签点击回调接口
     *
     * @param tagClickCallback 点击回调接口
     */
    public void setTagClickCallback(TagClickCallback tagClickCallback) {
        mTagClickCallback = tagClickCallback;
    }
    /**
     * 设置点击表情是否改变状态
     *
     * @param updateTabState true：改变
     */
    public void setUpdateTabState(boolean updateTabState) {
        this.mUpdateTabState = updateTabState;
    }
    /**
     * 设置水平间距
     *
     * @param horizontalSpace 间距
     */
    public void setHorizontalSpace(int horizontalSpace) {
        this.mHorizontalSpace = horizontalSpace;
    }
    /**
     * 标签点击回调接口
     */
    public interface TagClickCallback {
        void tagClick(View view);
    }
    /**
     * 每一行的数据
     */
    private static class RowTag {
        private final int mMaxWidth;
        private final int mHorizontalSpace;
        private final List<View> mTagViews;
        private int mUsedWidth;
        private int mHeight;
        public RowTag(int maxWidth, int horizontalSpace) {
            this.mMaxWidth = maxWidth;
            this.mHorizontalSpace = horizontalSpace;
            this.mTagViews = new ArrayList<>();
        }
        /**
         * 添加标签
         *
         * @param view 标签view
         */
        public void addTagView(View view) {
            int childWidth = view.getMeasuredWidth();
            int childHeight = view.getMeasuredHeight();
            if (mTagViews.size() == 0) {
                if (childWidth > mMaxWidth) {
                    mUsedWidth = mMaxWidth;
                } else {
                    mUsedWidth = childWidth + mHorizontalSpace;
                }
                mHeight = childHeight;
            } else {
                mUsedWidth += childWidth + mHorizontalSpace;
                mHeight = Math.max(childHeight, mHeight);
            }
            mTagViews.add(view);
        }
        /**
         * 判断是否可添加
         *
         * @param view 要添加的标签view
         * @return 如果剩余宽度可以装下要添加的标签view返回true
         */
        public boolean canAddView(View view) {
            if (mTagViews.size() == 0) {
                return true;
            }
            return view.getMeasuredWidth() <= (mMaxWidth - mUsedWidth - mHorizontalSpace);
        }
        /**
         * 布局标签
         *
         * @param t 头坐标
         * @param l 左坐标
         */
        public void layoutView(int t, int l) {
            int avg = 0;
            if (mTagViews.size() > 1) {
                avg = (mMaxWidth - mUsedWidth) / (mTagViews.size() - 1);
            }
            for (View view : mTagViews) {
                // 获取宽高 如需填充空余空间：measuredWidth = view.getMeasuredWidth() + avg
                int measuredWidth = view.getMeasuredWidth();
                int measuredHeight = view.getMeasuredHeight();
                // 重新测量
                view.measure(MeasureSpec.makeMeasureSpec(measuredWidth, MeasureSpec.EXACTLY), MeasureSpec.makeMeasureSpec(measuredHeight, MeasureSpec.EXACTLY));
                // 重新获取宽度值
                measuredWidth = view.getMeasuredWidth();
                int top = t;
                int left = l;
                int right = measuredWidth + left;
                int bottom = measuredHeight + top;
                // 指定位置
                view.layout(left, top, right, bottom);
                // 更新坐标
                l += measuredWidth + mHorizontalSpace;
            }
        }
    }
}

    /**
     * 构建标签
     *
     * @param tagName 标签名称
     */
    private void buildTagView(String tagName, boolean social) {
        RelativeLayout relativeLayout = new RelativeLayout(getContext());
        SuperTextView superTextView = new SuperTextView(getContext());
        superTextView.setGravity(Gravity.CENTER);
        superTextView.setText(tagName.length() > 5 ? tagName.substring(0, 5) : tagName);
        superTextView.setSolid(social ? Color.parseColor("#A68CFF") : Color.TRANSPARENT);
        if (!social) {
            superTextView.setStrokeColor(Color.parseColor("#EDEDED"));
            superTextView.setStrokeWidth(DensityUtil.dp2px(1));
        }
        superTextView.setTextColor(social ? Color.WHITE : Color.parseColor("#727272"));
        superTextView.setTextSize(11);
        superTextView.setCorner(DensityUtil.dp2px(14));
        superTextView.setOnClickListener(this);
        RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(DensityUtil.dp2px(70), DensityUtil.dp2px(28));
        relativeLayout.addView(superTextView, params);
        mBinding.tagSelectView.addView(relativeLayout);
    }