ListView中CheckBox批量删除item

本文介绍如何在Android的ListView中实现通过CheckBox选中多项并进行批量删除的功能。包括自定义实体Bean类、item布局文件的设计、适配器Adapter的编写及与主Activity的交互逻辑。

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ListView中CheckBox批量删除item的笔记,在这里记录一下,方便以后的使用。

首先效果图:
这里写图片描述

  1. 实体bean
public class Bean {

    private String username;

    private int age;

    private boolean isChecked;

    public Bean(String username, int age) {
        this.username = username;
        this.age = age;
    }

    public String getUsername() {
        return username;
    }

    public void setUsername(String username) {
        this.username = username;
    }

    public int getAge() {
        return age;
    }

    public void setAge(int age) {
        this.age = age;
    }

    public boolean isChecked() {
        return isChecked;
    }

    public void setChecked(boolean checked) {
        isChecked = checked;
    }

    @Override
    public String toString() {
        return "Bean{" +
                "username='" + username + '\'' +
                ", age=" + age +
                ", isChecked=" + isChecked +
                '}';
    }
}
  1. item布局文件
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:padding="15dp">


    <CheckBox
        android:id="@+id/cb_check"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1" />

    <TextView
        android:id="@+id/tv_username"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="2"
        android:text="小黑" />

    <TextView
        android:id="@+id/tv_age"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="2"
        android:text="12" />


</LinearLayout>
  1. 适配器 adapter
public class Adapter extends BaseAdapter {

    private List<Bean> dataList;

    private Context context;

    private List<Boolean> flagList;


    public Adapter(List<Bean> dataList, Context context) {
        this.dataList = dataList;
        this.context = context;
        flagList = new ArrayList<>();
        for (int i = 0; i < dataList.size(); i++) {
            flagList.add(false);
        }
    }

    @Override
    public int getCount() {
        return dataList.size();
    }

    @Override
    public Object getItem(int position) {
        return dataList.get(position);
    }

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

    @Override
    public View getView(final int position, View convertView, ViewGroup parent) {
        final ViewHolder holder;
        if (convertView == null) {
            holder = new ViewHolder();
            convertView = View.inflate(context, R.layout.layout_item, null);
            holder.cb_check = (CheckBox) convertView.findViewById(R.id.cb_check);
            holder.tv_username = (TextView) convertView.findViewById(R.id.tv_username);
            holder.tv_age = (TextView) convertView.findViewById(R.id.tv_age);
            convertView.setTag(holder);

        } else {
            holder = (ViewHolder) convertView.getTag();
        }

        final Bean bean = dataList.get(position);
        holder.cb_check.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {

                if (holder.cb_check.isChecked()) {
                    bean.setChecked(true);
                    flagList.set(position, true);


                } else {
                    bean.setChecked(false);
                    flagList.set(position, false);
                }
                Log.i("debug", "flagList=" + flagList);
            }
        });

        holder.tv_username.setText(bean.getUsername());
        holder.tv_age.setText(bean.getAge() + "");
        holder.cb_check.setChecked(bean.isChecked());


        return convertView;
    }

    static class ViewHolder {
        public CheckBox cb_check;

        public TextView tv_username;

        public TextView tv_age;
    }


    public List<Boolean> getFlagList() {
        return flagList;
    }


    public void setFlagList(List<Boolean> list) {
        flagList = list;
    }


    public void updateData(List<Bean> list) {
        dataList = list;
        notifyDataSetChanged();
    }

}
  1. 主要布局和Activity
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.an.listview.MainActivity">


    <ListView
        android:id="@+id/listView"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />


    <android.support.design.widget.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="right|bottom"
        android:layout_marginBottom="20dp"
        android:layout_marginRight="20dp"
        android:onClick="click"
        android:src="@drawable/delete"
        app:elevation="6dp"
        app:pressedTranslationZ="12dp"
        app:rippleColor="#33728dff" />


</FrameLayout>
public class MainActivity extends AppCompatActivity {

    private ListView listView;

    private Adapter adapter;

    private List<Bean> list;


    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listView = (ListView) findViewById(R.id.listView);
        list = new ArrayList<>();
        for (int i = 0; i < 20; i++) {
            list.add(new Bean("Tom->" + i, 20 + i));
        }
        if (adapter == null) {
            adapter = new Adapter(list, this);
            listView.setAdapter(adapter);
        } else {
            adapter.notifyDataSetChanged();
        }
    }

    public void click(View view) {
        List<Boolean> flagList = adapter.getFlagList();
        Log.i("debug", "get " + flagList);
        for (int i = 0; i < flagList.size(); ) {
            if (flagList.get(i)) {
                flagList.remove(i); //当删除一个数据时,紧接它后面的数据会移到删除数据的位置上,所以这时不应该i++
                list.remove(i);
                continue;
            }
            i++;
        }
        adapter.setFlagList(flagList);
        adapter.updateData(list);
    }

}
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