FlowLayout 流式布局加点击事件

最新推荐文章于 2022-03-02 11:26:33 发布

原创最新推荐文章于 2022-03-02 11:26:33 发布 · 2.8k 阅读

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CC 4.0 BY-SA版权

本文介绍了如何在FlowLayout流式布局中添加并优化点击事件，提供了简洁高效的解决方案。

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//简单优化之后的

public class FlowLayout extends ViewGroup {
    private Context con;
    private View child;
    private Dao d;

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

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

    public FlowLayout(Context context, AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        con = context;
        d = new Dao(context);
    }

    @Override
    protected void onLayout(boolean changed, int l, int t, int r, int b) {
        mAllViews.clear();
        mLineHeight.clear();
/**
 * 一般是定义为int top;一个top实际上是数组的下标
 left ： 指定矩形框左上角的x坐标
 top： 指定矩形框左上角的y坐标
 right： 指定矩形框右下角的x坐标
 bottom：指定矩形框右下角的y坐标
 */
        //获取屏幕的高度和宽度
        int width = getWidth();
        int height = getHeight();
        int lineWidth = 0;
        int lineHeight = 0;
        // 存储每一行所有的childView
        List<View> lineViews = new ArrayList<View>();
        int cCount = getChildCount();
        // 遍历所有的孩子
        for (int i = 0; i < cCount; i++)
        {
            //获取子控件
            View child = getChildAt(i);
            //子控件的点击事件
            child.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    //必须把view强转成一个新控件,不然一直都是最后一个item
                    TextView tv= (TextView) view;
                    String  h= (String) tv.getText();
                    SearchActivity.setEd(h);
                    User u=new User(h,0);
                    d.add(u);
                    //m.addUser(u,0);
                    List<User> users = d.show2();
                    Adaper m=new Adaper(getContext(),users);
                    MainActivity ma=new MainActivity();
                    ma.di(m);
                }
            });

            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();
            int childWidth = child.getMeasuredWidth();
            int childHeight = child.getMeasuredHeight();

            // 如果已经需要换行
            if (childWidth + lp.leftMargin + lp.rightMargin + lineWidth > width)
            {
                // 记录这一行所有的View以及最大高度
                mLineHeight.add(lineHeight);
                // 将当前行的childView保存，然后开启新的ArrayList保存下一行的childView
                mAllViews.add(lineViews);
                lineWidth = 0;// 重置行宽
                lineViews = new ArrayList<View>();
            }
            /**
             * 如果不需要换行，则累加
             */
            lineWidth += childWidth + lp.leftMargin + lp.rightMargin;
            lineHeight = Math.max(lineHeight, childHeight + lp.topMargin
                    + lp.bottomMargin);
            lineViews.add(child);
        }
        // 记录最后一行
        mLineHeight.add(lineHeight);
        mAllViews.add(lineViews);

        int left = 0;
        int top = 0;
        // 得到总行数
        int lineNums = mAllViews.size();
        for (int i = 0; i < lineNums; i++)
        {
            // 每一行的所有的views
            lineViews = mAllViews.get(i);
            // 当前行的最大高度
            lineHeight = mLineHeight.get(i);
            // 遍历当前行所有的View
            for (int j = 0; j < lineViews.size(); j++)
            {
                View child = lineViews.get(j);
                if (child.getVisibility() == View.GONE)
                {
                    continue;
                }
                MarginLayoutParams lp = (MarginLayoutParams) child
                        .getLayoutParams();

                //计算childView的left,top,right,bottom
                int lc = left + lp.leftMargin;
                int tc = top + lp.topMargin;
                int rc =lc + child.getMeasuredWidth();
                int bc = tc + child.getMeasuredHeight();
                child.layout(lc, tc, rc, bc);

                left += child.getMeasuredWidth() + lp.rightMargin
                        + lp.leftMargin;
            }
            left = 0;
            top += lineHeight;
        }

    }


    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        // 获得它的父容器为它设置的测量模式和大小
        int sizeWidth = MeasureSpec.getSize(widthMeasureSpec);
        int sizeHeight = MeasureSpec.getSize(heightMeasureSpec);
        int modeWidth = MeasureSpec.getMode(widthMeasureSpec);
        int modeHeight = MeasureSpec.getMode(heightMeasureSpec);

        Log.e(TAG, sizeWidth + "," + sizeHeight);

        // 如果是warp_content情况下，记录宽和高
        int width = 0;
        int height = 0;
        /**
         * 记录每一行的宽度，width不断取最大宽度
         */
        int lineWidth = 0;
        /**
         * 每一行的高度，累加至height
         */
        int lineHeight = 0;

        int cCount = getChildCount();

        // 遍历每个子元素
        for (int i = 0; i < cCount; i++)
        {
            child = getChildAt(i);
            // 测量每一个child的宽和高
            measureChild(child, widthMeasureSpec, heightMeasureSpec);
            // 得到child的lp
            MarginLayoutParams lp = (MarginLayoutParams) child
                    .getLayoutParams();
            // 当前子空间实际占据的宽度
            int childWidth = child.getMeasuredWidth() + lp.leftMargin
                    + lp.rightMargin;
            // 当前子空间实际占据的高度
            int childHeight = child.getMeasuredHeight() + lp.topMargin
                    + lp.bottomMargin;
            /**
             * 如果加入当前child，则超出最大宽度，则的到目前最大宽度给width，类加height 然后开启新行
             */
            if (lineWidth + childWidth > sizeWidth)
            {
                width = Math.max(lineWidth, childWidth);// 取最大的
                lineWidth = childWidth; // 重新开启新行，开始记录
                // 叠加当前高度，
                height += lineHeight;
                // 开启记录下一行的高度
                lineHeight = childHeight;
            } else
            // 否则累加值lineWidth,lineHeight取最大高度
            {
                lineWidth += childWidth;
                lineHeight = Math.max(lineHeight, childHeight);
            }
            // 如果是最后一个，则将当前记录的最大宽度和当前lineWidth做比较
            if (i == cCount - 1)
            {
                width = Math.max(width, lineWidth);
                height += lineHeight;
            }

        }
        setMeasuredDimension((modeWidth == MeasureSpec.EXACTLY) ? sizeWidth
                : width, (modeHeight == MeasureSpec.EXACTLY) ? sizeHeight
                : height);

    }
    /**
     * 存储所有的View，按行记录
     */
    private List<List<View>> mAllViews = new ArrayList<List<View>>();
    /**
     * 记录每一行的最大高度
     */
    private List<Integer> mLineHeight = new ArrayList<Integer>();

    /**
     * 与当前ViewGroup对应的LayoutParams
     */
    @Override
    public LayoutParams generateLayoutParams(AttributeSet attrs) {
        // TODO Auto-generated method stub

        return new MarginLayoutParams(getContext(), attrs);
    }
}

//没有优化的

public class MyGroupView extends ViewGroup {
    Button btn;
    View view;
    AttributeSet attributeSet;
    public MyGroupView(Context context) {
        this(context,null);
    }

    public MyGroupView(Context context, AttributeSet attrs) {
        super(context, attrs,0);
    }

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


    @Override
    public ViewGroup.LayoutParams generateLayoutParams(AttributeSet attrs)
    {
        return new MarginLayoutParams(getContext(), attrs);
    }

    @Override
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
        super.onMeasure(widthMeasureSpec, heightMeasureSpec);
        measureChildren(widthMeasureSpec, heightMeasureSpec);

    }

    @Override
    protected void onLayout(boolean b, int i, int i1, int i2, int i3) {
/**
 * 一般是定义为int top;一个top实际上是数组的下标
 left ： 指定矩形框左上角的x坐标
 top： 指定矩形框左上角的y坐标
 right： 指定矩形框右下角的x坐标
 bottom：指定矩形框右下角的y坐标
 */
        int width = getWidth();
        int height = getHeight();
        int tw = 0;
        int th = 0;
        for (int ii = 0; ii < getChildCount(); ii++) {
            View child = getChildAt(ii);
            view = child;
            btn = (Button) view;
            btn.setOnClickListener(new OnClickListener() {
                @Override
                public void onClick(View view) {
                    Dao dao = new Dao(getContext());
                    Button bt = (Button) view;
                    String a = bt.getText().toString();
                    Users users = new Users(a,"新品","特别厚","挨冻");
                    dao.ins(users);
                    MainActivity.aa();
                    MyTitle.ss(a);
                }
            });

            if (tw + child.getWidth() < width) {

            } else {
                tw = 0;
                th += child.getMeasuredHeight();   //超过屏幕的宽度，自动换行
            }

            child.layout(tw, th, tw + child.getMeasuredWidth(), th + child.getMeasuredHeight());
            tw += child.getMeasuredWidth();
        }
    }

}

//赋值

fl= findViewById(R.id.fl);
        ViewGroup.MarginLayoutParams lp = new ViewGroup.MarginLayoutParams(ViewGroup.LayoutParams.WRAP_CONTENT, ViewGroup.LayoutParams.WRAP_CONTENT);
        lp.leftMargin = 5;
        lp.rightMargin = 5;
        lp.topMargin = 5;
        lp.bottomMargin = 5;

        for(int i = 0; i < list.size(); i ++){
            TextView view = new TextView(this);
            view.setText(list.get(i));
            view.setTextColor(Color.BLACK);
            view.setBackgroundDrawable(getResources().getDrawable(R.drawable.shape));
            fl.addView(view,lp);
        }