Android 使用AlertDialog实现多选并保存选中状态

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先对要实现的效果做出描述：1、首次弹出对话框，如果有被选中的item，item的值设为true
2、可以随意选中和取消item
3、记录选中的状态
效果图：
这里写图片描述

public class MyActivity extent Activity{private Map<Integer, String> map= new HashMap<>();    protected void onCreate(Bundle savedInstanceState){            setContentView(R.layout.main);            //AVo.list ，BVo.list 是解析json获得的数据（一般是集合）            StringBuffer buffer = new StringBuffer();            for (int j = 0; j < AVo.list.size(); j++) {                    for (int q = 0; q < BVo.list.size(); q++) {                        if (BVo.list.get(q).equals(AVo.list.get(j))) {                            map.put(j, BVo.get(q));                            buffer.append(BVo.list.get(q) + ",");                        }                    }                }            button.setonClickListener(new View.OnClickListener(){                showDialog();        });    }    private void showDialog() {    //把获取的json数据解析后赋值给数组            String[] data=new String[AVo.list.size()];            boolean[] isCheck = new boolean[AVo.list.size()];    for(int i =0;i<AVo.list.size();i++){            data[i]=AVo.list.get(i);            if(map.containsKey(i)){            if(map.get(i).equals(AVo.list.get(i))){                isCkeck[i]=true;                    }                }            }        AlertDialog.Builder ab = new AlertDialog.Builder(TaskDetailActivity.this);        ab.setTitle("请选择位置");        ab.setCancelable(false);        ab.setMultiChoiceItems(data, isCheck, new DialogInterface.OnMultiChoiceClickListener() {            @Override            public void onClick(DialogInterface dialogInterface, int i, boolean b) {                isCheck[i] = b;            }        });        ab.setPositiveButton("确定", new DialogInterface.OnClickListener() {                    StringBuffer buffer = new StringBuffer();                    StringBuffer buffer1 = new StringBuffer();                    @Override                    public void onClick(DialogInterface dialogInterface, int i) {                        for (int q = 0; q < isCheck.length; q++) {                           if (isCheck[q] == true) {                                buffer.append(data[q] + "  ");                                buffer1.append(data[q] + ",");                                map.put(q, data[q]);                            } else if (map.containsKey(q)) {                                map.remove(q);                           }//                            isCheck[q] = false;                        }                        if (buffer.toString() != "") {                           String str = buffer1.toString();                           textview.setText("位置：" + buffer);                       } else {                           String str = buffer1.toString();                           buffer.delete(0, buffer.length());                           textview.setText("位置：" + buffer);                        }                    }                }        );        ab.setNegativeButton("取消", new DialogInterface.OnClickListener() {                    @Override                    public void onClick(DialogInterface dialogInterface, int i) {                    }                }        );        ab.create().show();                 }}

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