Bootstrap

Android Listview中使用checkbox

一、基本使用方法:
1.在子项布局中添加CheckBox
若要为Listview添加点击监听事件,需要在CheckBox属性中添加以下两个属性

android:clickable="false"
android:focusable="false

2.在Adapter中传入子项布局即可显示
3.为CheckBox添加选中监听事件

checkbox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
    public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                //写入你的处理事件
    }
});

二、问题及解决方案
问题:
上滑后再下滑,发现原来选中的CheckBox变为未选中
原因:
当勾选第0个条目时,此时isCheck状态为true,滑动条目到新的条目会复用第一个条目,而此OnCheckedChangeListener还未绑定新的条目,依然会调用第0个条目的回调,因此,当往回滑动时,第0个条目的isCheck状态依然会变成false。

解决方案:(我自定义的适配器继承自ArrayAdapter)
1.首先,在Java类中添加一个boolean参数,用于判断是否被选中
Java类代码示例

public class Novel_name_path {
    private boolean check;
    //构造方法
    public Novel_name_path(){
        this.check = false;
    }
    //获取选中状态
    public boolean getCheck(){
        return this.check;
    }
    //设置选中状态
    public void setCheck(boolean check){
        this.check = check;
    }
}

自定义Adapter代码示例

public class NovelAdapter extends ArrayAdapter<Novel_name_path> {


    private int recourceId;
    public NovelAdapter(Context context, int textViewRecourceId, List<Novel_name_path> objects){
        super(context,textViewRecourceId,objects);
        recourceId = textViewRecourceId;
    }

    @NonNull
    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        final Novel_name_path novel_name_path = getItem(position);
        View view;
        ViewHolder viewHolder;
        //提升效率
        if (convertView==null){
            view = LayoutInflater.from(getContext()).inflate(recourceId,parent,false);
            viewHolder = new ViewHolder();
            viewHolder.v_box = (CheckBox)view.findViewById(R.id.check_box);
            view.setTag(viewHolder);
        }else {
            view = convertView;
            viewHolder = (ViewHolder) view.getTag();
        }
        //设置监听事件
        viewHolder.v_box.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() {
            @Override
            public void onCheckedChanged(CompoundButton compoundButton, boolean b) {
                //设置选中状态
                novel_name_path.setCheck(b);
            }
        });
        //选中状态更新到UI中
        viewHolder.v_box.setChecked(novel_name_path.getCheck());
        
        return view;
    }


    class ViewHolder{
        CheckBox v_box;
    }
}

2.传入Adapter,第三个参数为public类型

//数据
public List<Novel_name_path> novel_name_paths = new ArrayList<>();

//传入Adapter
NovelAdapter adapter = new NovelAdapter(Importnovel.this,R.layout.list_novel,novel_name_paths);
listView.setAdapter(adapter);

问题解决~~

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