自定义一个类似listView和recylceView的需要setAdapter的控件

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package com.tddapp.main.common.customview;import android.content.Context;import android.content.res.TypedArray;import android.database.DataSetObserver;import android.util.AttributeSet;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import com.tddapp.main.R;/** * @author: xiaolijuan * @description: 流式布局-标签流容器 * @projectName: FlowLayoutDome * @date: 2016-06-16 * @time: 16:21 */public class FlowLayout extends ViewGroup{    /**     * 每个item纵向间距     */    private int mVerticalSpacing;    /**     * 每个item横向间距     */    private int mHorizontalSpacing;    private BaseAdapter mAdapter;    private TagItemClickListener mListener;    private DataChangeObserver mObserver;    public FlowLayout(Context context) {        this(context, null);    }    public FlowLayout(Context context, AttributeSet attrs) {        this(context, attrs, 0);    }    public FlowLayout(Context context, AttributeSet attrs, int defStyle) {        super(context, attrs, defStyle);        /**         * 获得我们所定义的自定义样式属性         */        TypedArray a = context.getTheme().obtainStyledAttributes(attrs, R.styleable.FlowLayout, defStyle, 0);        int index = a.getIndexCount();        for (int i = 0; i < index; i++) {            int attr = a.getIndex(i);            switch (attr) {                case R.styleable.FlowLayout_verticalSpacing:                    mVerticalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_verticalSpacing, 50);                    break;                case R.styleable.FlowLayout_horizontalSpacing:                    mHorizontalSpacing = a.getDimensionPixelSize(R.styleable.FlowLayout_horizontalSpacing, 100);                    break;            }        }        a.recycle();    }    /**     * 负责设置子控件的测量模式和大小 根据所有子控件设置自己的宽和高     */    @Override    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {        /**         * 默认宽为父容器为它设置的测量宽度         */        int width = MeasureSpec.getSize(widthMeasureSpec);        /**         * 高         */        int height = 0;        /**         * 每一行的高度，累加至height         */        int lineHeight = 0;        /**         * 在warp_content情况下，记录当前childView的左边的一个位置         */        int childLeft = getPaddingLeft();        /**         * 在warp_content情况下，记录当前childView的上边的一个位置         */        int childTop = getPaddingTop();        // getChildCount得到子view的数目,遍历循环出每个子View        for (int i = 0; i < getChildCount(); i++) {            //拿到index上的子view            View childView = getChildAt(i);            // 测量每一个child的宽和高            measureChild(childView, widthMeasureSpec, heightMeasureSpec);            //当前子空间实际占据的高度            int childHeight = childView.getMeasuredHeight();            //当前子空间实际占据的宽度            int childWidth = childView.getMeasuredWidth();            lineHeight = Math.max(childHeight, lineHeight);// 取最大值            //如果加入当前childView，超出最大宽度，则将目前最大宽度给width，类加height 然后开启新行            if (childWidth + childLeft + getPaddingRight() > width) {                childLeft = getPaddingLeft();// 重新开启新行，开始记录childLeft                childTop += mVerticalSpacing + childHeight;// 叠加当前的高度                lineHeight = childHeight;// 开启记录下一行的高度            }else{                //否则累加当前childView的宽度                childLeft += childWidth + mHorizontalSpacing;            }        }        height += childTop + lineHeight + getPaddingBottom();        setMeasuredDimension(width, height);    }    @Override    protected void onLayout(boolean changed, int l, int t, int r, int b) {        int width = r - l;        int childLeft = getPaddingLeft();        int childTop = getPaddingTop();        int lineHeight = 0;        //遍历所有childView根据其宽和高，计算子控件应该出现的位置        for (int i = 0; i < getChildCount(); i++) {            final View childView = getChildAt(i);            if (childView.getVisibility() == View.GONE) {                continue;            }            int childWidth = childView.getMeasuredWidth();            int childHeight = childView.getMeasuredHeight();            lineHeight = Math.max(childHeight, lineHeight);            // 如果已经需要换行            if (childLeft + childWidth + getPaddingRight() > width) {                childLeft = getPaddingLeft();                childTop += mVerticalSpacing + lineHeight;                lineHeight = childHeight;            }            childView.layout(childLeft, childTop, childLeft + childWidth, childTop + childHeight);            childLeft += childWidth + mHorizontalSpacing;        }    }    @Override    public LayoutParams generateLayoutParams(AttributeSet attrs) {        return new LayoutParams(this.getContext(), attrs);    }    private void drawLayout() {        if (mAdapter == null || mAdapter.getCount() == 0) {            return;        }        removeAllViews();        for (int i = 0; i < mAdapter.getCount(); i++) {            View view = mAdapter.getView(i, null, null);            final int position = i;            view.setOnClickListener(new OnClickListener() {                @Override                public void onClick(View v) {                    if (mListener != null) {                        mListener.itemClick(position,mAdapter.getItem(position));                    }                }            });            addView(view);        }    }    public void setAdapter(BaseAdapter adapter) {        if (mAdapter == null) {            mAdapter = adapter;            if (mObserver == null) {                mObserver = new DataChangeObserver();                mAdapter.registerDataSetObserver(mObserver);            }            drawLayout();        }    }    public void setItemClickListener(TagItemClickListener mListener) {        this.mListener = mListener;    }    public interface TagItemClickListener {        void itemClick(int position,Object bean);    }    class DataChangeObserver extends DataSetObserver {        @Override        public void onChanged() {            drawLayout();        }        @Override        public void onInvalidated() {            super.onInvalidated();        }    }}

==========================================================================                                                                                                                                                        我的理解：这种类似listview的控件就是一个ViewGroup，给里面添加一个个的子View。读取list数据，然后通过一个DataSetObserver来观察list这个数组的变化，如果发生了变化就会调用drawLayout重绘子View。所以Adapter的重点就是使用DataSetObserver。当然listView除了这个基础的原理，里面还有复用的处理。==========================================================================

import android.content.Context;import android.view.LayoutInflater;import android.view.View;import android.view.ViewGroup;import android.widget.BaseAdapter;import android.widget.Button;import com.tddapp.main.R;import com.tddapp.main.module.bean.ApplyAfterFee;import java.util.List;/** * @author: adan * @description: 流式布局适配器 * @projectName: FlowLayoutDome * @date: 2016-06-16 * @time: 16:22 */public class FlowLayoutAdapter extends BaseAdapter {    private Context mContext;    private List<ApplyAfterFee.ReasonsBean> mList;    public FlowLayoutAdapter(Context context, List<ApplyAfterFee.ReasonsBean> list) {        mContext = context;        mList = list;    }    @Override    public int getCount() {        return mList.size();    }    @Override    public ApplyAfterFee.ReasonsBean getItem(int position) {        return mList.get(position);    }    @Override    public long getItemId(int position) {        return position;    }    @Override    public View getView(int position, View convertView, ViewGroup parent) {        ViewHolder holder;        if (convertView == null) {            convertView = LayoutInflater.from(mContext).inflate(                    R.layout.item_tag, null);            holder = new ViewHolder();            holder.mBtnTag = (Button) convertView.findViewById(R.id.btn_tag);            convertView.setTag(holder);        } else {            holder = (ViewHolder) convertView.getTag();        }        holder.mBtnTag.setText(getItem(position).getLabel());        return convertView;    }    static class ViewHolder {        Button mBtnTag;    }}使用：  mHotLabelAdapter = new FlowLayoutAdapter(ApplyAfterSalesActivity.this, fee.getReasons());  flowLayout.setAdapter(mHotLabelAdapter);  flowLayout.setItemClickListener(new TagItemClickListener(){});

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