Andriod studio 学习 之 Listview中实现隐藏和显示多选框 实现全选,取消全选,反选,删除

Listview中实现隐藏和显示多选框 实现全选,取消全选,反选,删除

1.封装一个实体类存放listview中需要添加的内容

package com.example.choose;

public class Bean {
    private String num;
    private boolean ischecked;

    public Bean(String num, boolean ischecked) {
        this.num = num;
        this.ischecked = ischecked;
    }

    public Bean() {
    }

    public String getNum() {
        return num;
    }

    public void setNum(String num) {
        this.num = num;
    }

    public boolean isIschecked() {
        return ischecked;
    }

    public void setIschecked(boolean ischecked) {
        this.ischecked = ischecked;
    }
}

2.listview中适配器的代码

package com.example.choose;

import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.TextView;

import java.util.List;

public class Myadpater extends BaseAdapter {
    private Context context;
    private List<Bean> list;
    private boolean flag;

    public Myadpater(Context context, List<Bean> list, boolean flag) {
        this.context = context;
        this.list = list;
        this.flag = flag;
    }

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

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

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

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Viewholder viewholder;
        if (convertView==null){
            convertView = LayoutInflater.from(context).inflate(R.layout.layout, null);
            viewholder=new Viewholder();
            viewholder.textView=convertView.findViewById(R.id.textid);
            viewholder.checkBox=convertView.findViewById(R.id.checked);
            convertView.setTag(viewholder);
        }else {
            viewholder = (Viewholder) convertView.getTag();
        }
        viewholder.textView.setText(list.get(position).getNum());
        if (flag){
            viewholder.checkBox.setVisibility(View.VISIBLE);
        }else {
            viewholder.checkBox.setVisibility(View.GONE);
        }
        viewholder.checkBox.setChecked(list.get(position).isIschecked());
        return convertView;
    }
    class Viewholder{
        TextView textView;
        CheckBox checkBox;
    }
}

3.适配器中的布局文件

<?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="match_parent">
    <TextView
        android:id="@+id/textid"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        />
    <CheckBox
        android:layout_weight="0.1"
        android:id="@+id/checked"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:focusable="false"
        android:focusableInTouchMode="false"
        />
</LinearLayout>

4.Activity中的布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    android:id="@+id/layout"
    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=".MainActivity">

    <ListView
        android:id="@+id/listid"
        android:layout_weight="1"
        android:layout_width="match_parent"
        android:layout_height="0dp">
    </ListView>
    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:id="@+id/all"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="全选"
            />
        <Button
            android:id="@+id/noall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="取消全选"
            />
        <Button
            android:id="@+id/nochoose"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="反选"
            />
        <Button
            android:id="@+id/delete"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="删除"
            />
    </LinearLayout>

</LinearLayout>

5.Activity中的代码

package com.example.choose;

import android.graphics.Color;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.LinearLayout;
import android.widget.ListView;

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

public class MainActivity extends AppCompatActivity {
    private ListView listid;
    private Button all;
    private Button noall;
    private Button nochoose;
    private Button delete;
    private LinearLayout layout;
    private List<Bean> list = new ArrayList<>();
    private Myadpater myadpater;


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

        layout = (LinearLayout) findViewById(R.id.layout);
        listid = (ListView) findViewById(R.id.listid);
        all = (Button) findViewById(R.id.all);
        noall = (Button) findViewById(R.id.noall);
        nochoose = (Button) findViewById(R.id.nochoose);
        delete = (Button) findViewById(R.id.delete);
        list.add(new Bean("123",false));
        list.add(new Bean("456",false));
        list.add(new Bean("789",false));
        list.add(new Bean("147",false));

        myadpater = new Myadpater(MainActivity.this, list,false);
        listid.setAdapter(myadpater);
        listid.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
                Bean bean = list.get(position);
                if (bean.isIschecked()){
                    bean.setIschecked(false);
                    list.set(position,bean);
                }else {
                    bean.setIschecked(true);
                    list.set(position,bean);
                }

                myadpater.notifyDataSetChanged();
            }
        });

        listid.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
            @Override
            public boolean onItemLongClick(AdapterView<?> parent, View view, int position, long id) {
                myadpater = new Myadpater(MainActivity.this, list,true);
                listid.setAdapter(myadpater);
                myadpater.notifyDataSetChanged();
                return false;
            }
        });

        all.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                for (int i = 0; i < list.size(); i++) {
                    list.get(i).setIschecked(true);
                }
                myadpater.notifyDataSetChanged();
            }
        });
        noall.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                for (int i = 0; i < list.size(); i++) {
                    list.get(i).setIschecked(false);
                }
                myadpater.notifyDataSetChanged();
            }
        });
        nochoose.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                for (int i = 0; i < list.size(); i++) {
                    boolean ischecked = list.get(i).isIschecked();
                    if (ischecked){
                        list.get(i).setIschecked(false);
                    }else {
                        list.get(i).setIschecked(true);
                    }
                }
                myadpater.notifyDataSetChanged();
            }
        });
        delete.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                for (int i = 0; i < list.size(); i++) {
                    if (list.get(i).isIschecked()){
                        list.remove(list.get(i));
                    }
                }
                myadpater.notifyDataSetChanged();
            }
        });
    }
}