商品規格選擇佈局之FlowLayout

       商城類項目中不可避免的會出現商品的屬性選擇，使用一般的GridView也可以處理，GridView是確定一行顯示幾條屬性，但是如果某個屬性的屬性值長短不一，一行不能夠顯示完，換行的話又會顯示的特別難看，那麼這個時候就會用到FlowLayout。

      FlowLayout可以讓屬性值單行顯示，當一行顯示不下下一條屬性時就會換行。

     

    之前找到過FlowLayout的資料，但是都沒有發現裏面有子View的點擊事件，我參考了GridView的源碼重寫了onTouch方法，加上了OnItemClickListener，代碼如下

@SuppressLint("ClickableViewAccessibility")
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            float x = event.getX();
            float y = event.getY();
            Rect rect = new Rect();
            for (int i = 0; i < getChildCount(); i++) {
                getChildAt(i).getHitRect(rect);
                if (rect.contains((int) x, (int) y)) {
                    if (listener != null) {
                        listener.click(getChildAt(i), i);
                        getChildAt(i).performClick();
                        return true;
                    }
                }
            }
        }

        return super.onTouchEvent(event);
    }
private OnItemClickListener listener;

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.listener = listener;
    }

    public interface OnItemClickListener {
        void click(View view, int position);
    }

設置屬性規格的代碼如下：

private void initData(){
        groupBeans.clear();
        List<SpecGroupBean.SpecBean> specBeans1 = new ArrayList<>();
        specBeans1.add(new SpecGroupBean.SpecBean("紅色"));
        specBeans1.add(new SpecGroupBean.SpecBean("綠色"));
        specBeans1.add(new SpecGroupBean.SpecBean("卡其色"));
        specBeans1.add(new SpecGroupBean.SpecBean("高山流水綠"));
        specBeans1.add(new SpecGroupBean.SpecBean("深海波濤藍"));
        specBeans1.add(new SpecGroupBean.SpecBean("紅霞滿天緋紅色"));
        specBeans1.add(new SpecGroupBean.SpecBean("深海波濤藍"));
        specBeans1.add(new SpecGroupBean.SpecBean("紅霞滿天緋紅色"));
        groupBeans.add(new SpecGroupBean("顏色",specBeans1));
        List<SpecGroupBean.SpecBean> specBeans2 = new ArrayList<>();
        specBeans2.add(new SpecGroupBean.SpecBean("紅霞滿天緋紅色"));
        specBeans2.add(new SpecGroupBean.SpecBean("紅色"));
        specBeans2.add(new SpecGroupBean.SpecBean("深海波濤藍23542"));
        specBeans2.add(new SpecGroupBean.SpecBean("卡其色"));
        specBeans2.add(new SpecGroupBean.SpecBean("高山流水綠"));
        specBeans2.add(new SpecGroupBean.SpecBean("綠色"));
        specBeans2.add(new SpecGroupBean.SpecBean("深海波濤藍"));
        specBeans2.add(new SpecGroupBean.SpecBean("深海波濤藍353945"));
        groupBeans.add(new SpecGroupBean("顏色22222",specBeans2));
    }

    private CommentAdapter<SpecGroupBean> specModeCommentAdapter;

    private void setSpec() {
        if (specModeCommentAdapter != null) {
            specModeCommentAdapter.notifyDataSetChanged();
        } else {
            specModeCommentAdapter = new CommentAdapter<SpecGroupBean>(MainActivity.this, groupBeans, R.layout.item_spec_lay) {
                @Override
                protected void setItem(View convertView, final SpecGroupBean item, int position) {
                    TextView spec_type = convertView.findViewById(R.id.spec_type);
                    final FlowLayout specFlowLayout = convertView.findViewById(R.id.spec_flow_layout);
                    spec_type.setText(item.getName());
                    specFlowLayout.removeAllViews();
                    for (int i = 0; i < item.getListGuiGe().size(); i++) {
                        TextView tv = (TextView) mInflater.inflate(
                                R.layout.spec_item, specFlowLayout, false);
                        tv.setText(item.getListGuiGe().get(i).getName());
                        specFlowLayout.addView(tv);
                    }
                    specFlowLayout.setOnItemClickListener(new FlowLayout.OnItemClickListener() {
                        @Override
                        public void click(View view, int position) {
                            for (int i = 0; i < specFlowLayout.getChildCount(); i++) {
                                if (i == position) {
                                    item.getListGuiGe().get(i).setSelect(true);
                                    TextView tv = (TextView) specFlowLayout.getChildAt(i);
                                    tv.setBackgroundResource(R.drawable.spec_selected_bg);
                                    tv.setTextColor(getResources().getColor(R.color.app_red));

                                } else {
                                    item.getListGuiGe().get(i).setSelect(false);
                                    TextView tv = (TextView) specFlowLayout.getChildAt(i);
                                    tv.setBackgroundResource(R.drawable.spec_select_bg);
                                    tv.setTextColor(getResources().getColor(R.color.goods_spec_color));
                                }
                            }

                        }
                    });
                }
            };
            specLv.setAdapter(specModeCommentAdapter);
        }
    }

當然，實際應用時要把initData替換成自己的數據源。Adapter我是用的自己封裝好的Adapter，也是可以替換成你自己的自定義Adapter。

下面貼出來Flowlayout  的完整代碼，只要把這個類複製出來就可以使用FlowLayout了。

public class FlowLayout extends ViewGroup {
    public FlowLayout(Context context, AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public FlowLayout(Context context, AttributeSet attrs) {
        this(context, attrs, 0);
    }

    public FlowLayout(Context context) {
        this(context, null);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {

        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
        int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

        // 如果是warp_content情況下，記錄寬和高
        int width = 0;
        int height = 0;

        // 記錄每一行的寬度與高度
        int lineWidth = 0;
        int lineHeight = 0;

        // 得到內部元素的個數
        int cCount = getChildCount();

        for (int i = 0; i < cCount; i++) {
            // 通過索引拿到每一個子view
            View child = getChildAt(i);
            // 測量子View的寬和高,系統提供的measureChild
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            // 得到LayoutParams
            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();

            // 子View佔據的寬度
            int childWidth = child.getMeasuredWidth() + lp.leftMargin
                    + lp.rightMargin;
            // 子View佔據的高度
            int childHeight = child.getMeasuredHeight() + lp.topMargin
                    + lp.bottomMargin;

            // 換行 判斷 當前的寬度大於 開闢新行
            if (lineWidth + childWidth > sizeWidth - getPaddingLeft() - getPaddingRight()) {
                // 對比得到最大的寬度
                width = Math.max(width, lineWidth);
                // 重置lineWidth
                lineWidth = childWidth;
                // 記錄行高
                height += lineHeight;
                lineHeight = childHeight;
            } else
            // 未換行
            {
                // 疊加行寬
                lineWidth += childWidth;
                // 得到當前行最大的高度
                lineHeight = Math.max(lineHeight, childHeight);
            }
            // 特殊情況,最後一個控件
            if (i == cCount - 1) {
                width = Math.max(lineWidth, width);
                height += lineHeight;
            }
        }
        setMeasuredDimension(
                modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width + getPaddingLeft() + getPaddingRight(),
                modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height + getPaddingTop() + getPaddingBottom()//
        );

    }

    /**
     * 存儲所有的View
     */
    private List<List<View>> mAllViews = new ArrayList<List<View>>();
    /**
     * 每一行的高度
     */
    private List<Integer> mLineHeight = new ArrayList<Integer>();

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        mAllViews.clear();
        mLineHeight.clear();

        // 當前ViewGroup的寬度
        int width = getWidth();

        int lineWidth = 0;
        int lineHeight = 0;

        // 存放每一行的子view
        List<View> lineViews = new ArrayList<View>();

        int cCount = getChildCount();

        for (int i = 0; i < cCount; i++) {
            View child = getChildAt(i);
            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();

            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            // 如果需要換行
            if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width - getPaddingLeft() - getPaddingRight()) {
                // 記錄LineHeight
                mLineHeight.add(lineHeight);
                // 記錄當前行的Views
                mAllViews.add(lineViews);

                // 重置我們的行寬和行高
                lineWidth = 0;
                lineHeight = childHeight + lp.topMargin + lp.bottomMargin;
                // 重置我們的View集合
                lineViews = new ArrayList<View>();
            }
            lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
            lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
                    + lp.bottomMargin);
            lineViews.add(child);

        }// for end
        // 處理最後一行
        mLineHeight.add(lineHeight);
        mAllViews.add(lineViews);

        // 設置子View的位置

        int left = getPaddingLeft();
        int top = getPaddingTop();

        // 行數
        int lineNum = mAllViews.size();

        for (int i = 0; i < lineNum; i++) {
            // 當前行的所有的View
            lineViews = mAllViews.get(i);
            lineHeight = mLineHeight.get(i);

            for (int j = 0; j < lineViews.size(); j++) {
                View child = lineViews.get(j);
                // 判斷child的狀態
                if (child.getVisibility() == View.GONE) {
                    continue;
                }

                MarginLayoutParams lp = (MarginLayoutParams) child
                        .getLayoutParams();

                int lc = left + lp.leftMargin;
                int tc = top + lp.topMargin;
                int rc = lc + child.getMeasuredWidth();
                int bc = tc + child.getMeasuredHeight();

                // 爲子View進行佈局
                child.layout(lc, tc, rc, bc);

                left += child.getMeasuredWidth() + lp.leftMargin
                        + lp.rightMargin;
            }
            left = getPaddingLeft();
            top += lineHeight;
        }

    }

    /**
     * 與當前ViewGroup對應的LayoutParams
     */
    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        return new MarginLayoutParams(getContext(), attrs);
    }

    @SuppressLint("ClickableViewAccessibility")
    @Override
    public boolean onTouchEvent(MotionEvent event) {
        if (event.getAction() == MotionEvent.ACTION_DOWN) {
            float x = event.getX();
            float y = event.getY();
            Rect rect = new Rect();
            for (int i = 0; i < getChildCount(); i++) {
                getChildAt(i).getHitRect(rect);
                if (rect.contains((int) x, (int) y)) {
                    if (listener != null) {
                        listener.click(getChildAt(i), i);
                        getChildAt(i).performClick();
                        return true;
                    }
                }
            }
        }

        return super.onTouchEvent(event);
    }

    private OnItemClickListener listener;

    public void setOnItemClickListener(OnItemClickListener listener) {
        this.listener = listener;
    }

    public interface OnItemClickListener {
        void click(View view, int position);
    }

}

如果想要完整項目的童鞋可以點擊該鏈接下載：FlowLayoutDemo

 

ps：第一次寫博客，語言組織有點捉急，見諒。（手動滑稽）