ListView全選

Listview的全選反選非常常用，今天總結了下：
activity_main

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

    <TextView
        android:id="@+id/selectnum"
        android:layout_width="match_parent"
        android:layout_height="wrap_content" />

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="horizontal" >

        <Button
            android:id="@+id/selectall"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="全選" />

        <Button
            android:id="@+id/reverse"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="反選" />

        <Button
            android:id="@+id/cancel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="取消選擇" />

        <Button
            android:id="@+id/delect"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="刪除" />
    </LinearLayout>

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

</LinearLayout>

item

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent" >
    <TextView 
        android:id="@+id/text"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"/>
    <CheckBox 
        android:id="@+id/check"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:clickable="false"
        android:focusable="false"
        android:focusableInTouchMode="false"/>

</RelativeLayout>

MainActivity.class

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

import com.example.auser.checkboxselectlx.Adapter.Holder;

import android.os.Bundle;
import android.app.Activity;
import android.view.Menu;
import android.view.View;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;

public class MainActivity extends Activity {

    private Button selectall;
    private Button reverse;//反選
    private Button cancel;//取消
    private Button delect;//刪除
    private ListView listview;
    private Adapter adapter;
    private List<String> listStr;
    private TextView selectnum;
    private int num;
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        listStr=new ArrayList<String>();
        listAdd();
        selectall=(Button) findViewById(R.id.selectall);
        reverse=(Button) findViewById(R.id.reverse);
        cancel=(Button) findViewById(R.id.cancel);
        delect=(Button) findViewById(R.id.delect);
        listview=(ListView) findViewById(R.id.list);
        selectnum=(TextView)findViewById(R.id.selectnum);
        adapter=new Adapter(MainActivity.this,listStr);
        listview.setAdapter(adapter);
        selectall.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                for (int i = 0; i < listStr.size(); i++) {
                    adapter.isMap().put(i,true);
                }
                num=listStr.size();
                dataNew();
            }
        });
        reverse.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                for (int i = 0; i < listStr.size(); i++) {
                    if (adapter.isMap().get(i)) {
                        adapter.isMap().put(i,false);
                        num--;
                    }else{
                        adapter.isMap().put(i,true);
                        num++;
                    }
                }
                dataNew();
            }
        });
        cancel.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                for (int i = 0; i < listStr.size(); i++) {
                    if (adapter.isMap().get(i)) {
                        adapter.isMap().put(i,false);
                        num--;
                    }
                }
                dataNew();
            }
        });
        delect.setOnClickListener(new OnClickListener() {
            @Override
            public void onClick(View v) {
                List<String> tempList=new ArrayList<String>();
                for (int i = 0; i < listStr.size(); i++) {
                    if (adapter.isMap().get(i)) {
                        adapter.isMap().put(i,false);
                        tempList.add(listStr.get(i));
                        num=0;
                    }
                }
                listStr.removeAll(tempList);
                dataNew();
            }
        });
        listview.setOnItemClickListener(new OnItemClickListener() {

            @Override
            public void onItemClick(AdapterView<?> arg0, View arg1, int arg2,
                                    long arg3) {
                Holder holder=(Holder) arg1.getTag();
                holder.check.toggle();//改變狀態
                Adapter.isMap().put(arg2, holder.check.isChecked());
                if (holder.check.isChecked()==true) {
                    num++;
                }else{
                    num--;
                }
                selectnum.setText("已選擇"+num+"項");
            }
        });
    }

    public void listAdd(){
        for (int i = 0; i < 20; i++) {
            listStr.add("str"+i);
        }
    }

    public void dataNew(){
        adapter.notifyDataSetChanged();
        selectnum.setText("已選擇"+num+"項");
    }

}

Adapter.class

import java.util.HashMap;
import java.util.List;
import java.util.Map;

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

public class Adapter extends BaseAdapter {

    private Context context;
    private List<String> list;
    private static Map<Integer,Boolean> isMap;
    private int type;
    public Adapter(Context context,List<String> list) {
        this.context=context;
        this.list=list;
        isMap=new HashMap<Integer, Boolean>();
        for (int i = 0; i < list.size(); i++) {
            isMap().put(i, false);
        }
    }
    @Override
    public int getCount() {
        return list.size();
    }

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

    @Override
    public long getItemId(int position) {
        return 0;
    }

    @Override
    public View getView(int position, View convertView, ViewGroup parent) {
        Holder holder;
        if (convertView==null) {
            holder=new Holder();
            convertView=LinearLayout.inflate(context, R.layout.item, null);
            holder.text=(TextView) convertView.findViewById(R.id.text);
            holder.check=(CheckBox) convertView.findViewById(R.id.check);
            convertView.setTag(holder);
        }else{
            holder=(Holder) convertView.getTag();
        }
        holder.text.setText(list.get(position));
        holder.check.setChecked(isMap().get(position));

        return convertView;
    }
    class Holder{
        TextView text;
        CheckBox check;
    }
    public static Map<Integer, Boolean> isMap(){
        return isMap;

    }
}