listview中的checkbox错乱

最新推荐文章于 2018-07-09 23:35:14 发布

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最新推荐文章于 2018-07-09 23:35:14 发布

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分类专栏： checkbox

本文链接：https://blog.youkuaiyun.com/qq_38913065/article/details/78391133

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本文介绍如何在Android应用中使用ListView结合自定义Adapter实现带有Checkbox的功能，并通过示例代码展示了如何处理Checkbox的状态变更。

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先看效果：未点击

点击时候：

滑动时候：

1.在MainActivity中：

package com.example.administrator.adapter;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.widget.ListView;

import java.util.ArrayList;
import java.util.List;

//模拟假数据,checkbox的选中
public class MainActivity extends AppCompatActivity {

    private ListView mListView;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        initView();
        initData();
    }

    private void initView() {
        mListView = (ListView) findViewById(R.id.listView);
    }

    private void initData() {
        List<MyData> list = new ArrayList<>();
        for (int i = 0; i < 100; i++) {
            MyData myData = new MyData();
            myData.setName("测试数据" + i);
            myData.setAddress("北京" + i);
            list.add(myData);
        }
        MyAdapter myAdapter = new MyAdapter(this, list);
        mListView.setAdapter(myAdapter);
    }
}

2.adapter中：

package com.example.administrator.adapter;

import android.content.Context;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.CompoundButton;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

/**
 * Created by Administrator on 2017/10/30.
 */

public class MyAdapter extends BaseAdapter {
    private Context context;
    private List<MyData> list;
    HashMap<Integer, Boolean> state = new HashMap<Integer, Boolean>();

    public MyAdapter(Context context, List<MyData> list) {
        this.context = context;
        this.list = list;
    }

    @Override
    public int getCount() {
        return list == null ? 0 : list.size();
    }

    @Override
    public Object getItem(int i) {
        return list.get(i);
    }

    @Override
    public long getItemId(int i) {
        return i;
    }

    @Override
    public View getView(final int i, View convertView, ViewGroup viewGroup) {
        ViewHolder holder = null;
        if (convertView == null) {
            convertView = View.inflate(context, R.layout.item, null);
            holder = new ViewHolder();
            holder.textView = convertView.findViewById(R.id.textView);
            holder.address = convertView.findViewById(R.id.address);
            holder.checkbox = convertView.findViewById(R.id.checkbox);
            convertView.setTag(holder);
        } else {
            holder = (ViewHolder) convertView.getTag();
        }
        holder.textView.setText(list.get(i).getName());
        holder.address.setText(list.get(i).getAddress());
        holder.checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean isChecked) {
                if (isChecked) {
                    state.put(i, isChecked);
                } else {
                    state.remove(i);
                }
            }
        });
        holder.checkbox.setChecked(state.get(i) == null ? false : true);
        return convertView;
    }

    static class ViewHolder {
        TextView textView;
        TextView address;
        CheckBox checkbox;
    }
}

3.bean类：

package com.example.administrator.adapter;

/**
 * Created by Administrator on 2017/10/30.
 */

public class MyData {
    private String name;
    private String address;

    public MyData() {
    }

    public MyData(String name, String address) {
        this.name = name;
        this.address = address;
    }

    public String getName() {
        return name;
    }

    public void setName(String name) {
        this.name = name;
    }

    public String getAddress() {
        return address;
    }

    public void setAddress(String address) {
        this.address = address;
    }
}