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SelectItemManger##

自己被自己的认真程度吓到了，考虑了好多情况，写到半夜终于写完了，感觉自己得到了升华，估计又要掉不少头发。吹没吹，看看代码吧，哈哈。

package com.nevermore.util;/*** Created by Administrator on 2017/3/26.*/import android.util.SparseBooleanArray;import java.util.ArrayList;
import java.util.List;/**** @ClassName:SelectItemManger* @PackageName:com.nevermore.util* @Create On 2017/3/26   0:39* @author:xuchuanting* @Copyrights 2017/3/26 nevermore All rights reserved.*/
public class SelectItemManger {public enum Mode {MODE_SINGLE_SELECTION, MODE_MULTI_SELECTION;}//用于监听多选模式达到上限public interface OnReachToMaxListener {void reachToMax();}//单选模式 item 变化public interface OnItemChangeListener {void itemChange(int position, Object item);}public interface OnGetItem {Object getItem(int positon);}/*** 单选模式*/public static int MODE_SINGLE_SELECTION = 0;//最近一次点击的条目位置private int lastposition = -1;private OnGetItem getItem;private OnItemChangeListener itemChangeListener;private Mode mode;private int mMax = -1;//多选模式，上限，-1无上限private int selectedItemCount = 0;//已经选择的条目数量private OnReachToMaxListener maxListener;/*** 多选模式*/public static int MODE_MULTI_SELECTION = 1;private int size;private final SparseBooleanArray booleanArray;public SelectItemManger(int size, Mode mode) {this.size = size;this.mode = mode;booleanArray = new SparseBooleanArray();}public int getItemCount() {return size;}public void setReachToMaxListener(OnReachToMaxListener maxListener) {this.maxListener = maxListener;}/*** 切换模式** @param mode*/public void changeMode(Mode mode) {this.mode = mode;}public OnItemChangeListener getItemChangeListener() {return itemChangeListener;}public void setItemChangeListener(OnItemChangeListener itemChangeListener, OnGetItem getItem) {this.itemChangeListener = itemChangeListener;this.getItem = getItem;}/*** 设置多选上限** @param max*/public void setMaxItem(int max) {mMax = max;}/*** 选中条目** @param position*/public void selectItem(int position) {if (this.mode.equals(Mode.MODE_SINGLE_SELECTION)) {if (lastposition != position) {booleanArray.put(lastposition, false);if (itemChangeListener != null && getItem != null) {itemChangeListener.itemChange(position, getItem.getItem(position));}}booleanArray.put(position, true);} else {//多选模式，第一次选种，第二次取消boolean b = booleanArray.get(position);if (b) {booleanArray.put(position, false);selectedItemCount--;} else {if (maxListener != null && mMax != -1 && selectedItemCount == mMax) {//达到上限maxListener.reachToMax();//上限到达后，再次选择调用} else {booleanArray.put(position, true);selectedItemCount++;}}}lastposition = position;}/*** 适用于多选模式，选择多个条目(一般用于初始化操作，很少有一次性点击选中多个条目的需求吧)* 一个一个选就用{@link #selectItem}好了** @param positions*/public void selectItems(List<Integer> positions) {if (this.mode.equals(Mode.MODE_MULTI_SELECTION)) {selectedItemCount += positions.size();for (int i = 0; i < positions.size(); i++) {Integer integer = positions.get(i);booleanArray.put(integer, true);}} else {throw new IllegalStateException("单选模式不能选多个条目！");}}/*** 获取被选中条目位置position** @return*/public List<Integer> getSelectedItem() {ArrayList<Integer> list = new ArrayList<>();for (int i = 0; i < booleanArray.size(); i++) {if (booleanArray.get(booleanArray.keyAt(i))) {list.add(booleanArray.keyAt(i));}}return list;}/*** 判断条目是否被选中** @param position* @return*/public boolean isItemSelected(int position) {return booleanArray.get(position);}/*** 添加新条目，如上拉加载场景** @param size*/public void addNewItems(int size) {this.size += size;}/*** 删除已选中条目*/public void delectSelectedItem() {List<Integer> selectItem = getSelectedItem();for (int i = 0; i < selectItem.size(); i++) {Integer key = selectItem.get(i);booleanArray.delete(key);}size -= selectItem.size();}}