自定义view之热门标签

来源：互联网发布：vue.js怎么用编辑：程序博客网时间：2024/04/30 00:45

相信很多项目中都需要用到热门标签，效果如下：
这里写图片描述

代码实现
1、自定义热门标签的ViewGroup实现

package com.tsne.playindx.common;import android.content.Context;import android.util.AttributeSet;import android.util.Log;import android.view.View;import android.view.ViewGroup;import java.util.ArrayList;import java.util.List;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);        // wrap_content        int width = 0;        int height = 0;        // 记录每一行的宽度与高度        int lineWidth = 0;        int lineHeight = 0;        // 得到内部元素的个数        int cCount = getChildCount();        for (int i = 0; i < cCount; i++) {            View child = getChildAt(i);            // 测量子View的宽和高            measureChild(child, widthMeasureSpec, heightMeasureSpec);            // 得到LayoutParams            MarginLayoutParams lp = (MarginLayoutParams) child                    .getLayoutParams();            // 子View占据的宽度            int childWidth = child.getMeasuredWidth() + lp.leftMargin                    + lp.rightMargin;            // 子View占据的高度            int childHeight = child.getMeasuredHeight() + lp.topMargin                    + lp.bottomMargin;            // 换行            if (lineWidth + childWidth > sizeWidth - getPaddingLeft() - getPaddingRight()) {                // 对比得到最大的宽度                width = Math.max(width, lineWidth);                // 重置lineWidth                lineWidth = childWidth;                // 记录行高                height += lineHeight;                lineHeight = childHeight;            } else            // 未换行            {                // 叠加行宽                lineWidth += childWidth;                // 得到当前行最大的高度                lineHeight = Math.max(lineHeight, childHeight);            }            // 最后一个控件            if (i == cCount - 1) {                width = Math.max(lineWidth, width);                height += lineHeight;            }        }        Log.e("TAG", "sizeWidth = " + sizeWidth);        Log.e("TAG", "sizeHeight = " + sizeHeight);        setMeasuredDimension(                //                modeWidth == MeasureSpec.EXACTLY ? sizeWidth : width + getPaddingLeft() + getPaddingRight(),                modeHeight == MeasureSpec.EXACTLY ? sizeHeight : height + getPaddingTop() + getPaddingBottom()//        );    }    /**     * 存储所有的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();        // 当前ViewGroup的宽度        int width = getWidth();        int lineWidth = 0;        int lineHeight = 0;        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();            // 如果需要换行            if (childWidth + lineWidth + lp.leftMargin + lp.rightMargin > width - getPaddingLeft() - getPaddingRight()) {                // 记录LineHeight                mLineHeight.add(lineHeight);                // 记录当前行的Views                mAllViews.add(lineViews);                // 重置我们的行宽和行高                lineWidth = 0;                lineHeight = childHeight + lp.topMargin + lp.bottomMargin;                // 重置我们的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        // 处理最后一行        mLineHeight.add(lineHeight);        mAllViews.add(lineViews);        // 设置子View的位置        int left = getPaddingLeft();        int top = getPaddingTop();        // 行数        int lineNum = mAllViews.size();        for (int i = 0; i < lineNum; i++) {            // 当前行的所有的View            lineViews = mAllViews.get(i);            lineHeight = mLineHeight.get(i);            for (int j = 0; j < lineViews.size(); j++) {                View child = lineViews.get(j);                // 判断child的状态                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();                // 为子View进行布局                child.layout(lc, tc, rc, bc);                left += child.getMeasuredWidth() + lp.leftMargin                        + lp.rightMargin;            }            left = getPaddingLeft();            top += lineHeight;        }    }    /**     * 与当前ViewGroup对应的LayoutParams     */    @Override    public LayoutParams generateLayoutParams(AttributeSet attrs) {        return new MarginLayoutParams(getContext(), attrs);    }}

2、引用自定义控件：

<LinearLayout                android:layout_width="match_parent"                android:layout_height="wrap_content"                android:background="@color/bg_color"                android:orientation="vertical">                <TextView                    android:layout_width="wrap_content"                    android:layout_height="wrap_content"                    android:layout_marginLeft="20dp"                    android:text="@string/hot_search"                    android:textColor="@color/black"                    android:textSize="18sp" />                <com.tsne.playindx.common.FlowLayout                    android:id="@+id/search_xc_flow"                    android:layout_width="match_parent"                    android:layout_height="wrap_content"                    android:layout_marginBottom="20dp"                    android:layout_marginLeft="40dp"                    android:layout_marginRight="40dp"                    android:layout_marginTop="20dp" />            </LinearLayout>

3、如何使用该自定义的热门标签控件类

private String mNames[] = {            "welcome", "android", "TextView",            "apple", "a", "n",            "jordan", "bvc", "c",            "margin", "padding", "text",            "name", "type", "searchsearch", "logcatlogcatlogcat"    };private void initView() {        LayoutInflater mInflater = LayoutInflater.from(this);        for (int i = 0; i < mNames.length; i++) {            TextView tv = (TextView) mInflater.inflate(R.layout.flow_tv,                    mFlowLayout, false);            tv.setText(mNames[i]);            mFlowLayout.addView(tv);        }    }

4、自定义textview属性背景

<shape xmlns:android="http://schemas.android.com/apk/res/android">    <solid android:color="#666666" />    <corners android:radius="10dp" />    <padding        android:bottom="5dp"        android:left="5dp"        android:right="5dp"        android:top="5dp" /></shape>

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