AndroidStudio下实现包含ListView的弹出窗口

工程中需要选择文件夹中的多个文件，这个功能可以通过PopupWindow结合ListView实现。
编写工程中需要的布局文件。
主窗口布局activity_main.xml

<?xml version="1.0" encoding="utf-8"?>
<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:paddingBottom="@dimen/activity_vertical_margin"
    android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    tools:context="dell.popwindow.MainActivity">

    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Hello World!" />
    <Button
        android:id="@+id/main_show"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="@string/显示"/>
</LinearLayout>

弹出窗口布局poptest.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ListView
        android:id="@+id/pop_list"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"/>
    <LinearLayout
        android:orientation="horizontal"
        android:layout_gravity="center"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
        <Button
            android:id="@+id/pop_ok"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/确定"/>
        <Button
            android:id="@+id/pop_cancel"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:text="@string/取消"/>
    </LinearLayout>

</LinearLayout>

列表子项布局listview_item.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <ImageView
        android:id="@+id/item_img"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

    <TextView
        android:id="@+id/item_name"
        android:layout_weight="1"
        android:layout_width="0dp"
        android:layout_height="wrap_content" />
    <CheckBox
        android:id="@+id/item_cb"
        android:focusable="false"
        android:focusableInTouchMode="false"
        android:clickable="false"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content" />

</LinearLayout>

编写列表适配器代码

public class PopAdapter extends BaseAdapter {
    private Context context;
    private List<String> list;
    public static Map<Integer,Boolean> isSelected;
    public PopAdapter(Context context){
        this.context = context;
        list = new ArrayList<>();
        list.add("appale");
        list.add("banana");
        list.add("orange");
        list.add("pear");
        list.add("cherry");
        isSelected = new HashMap<Integer, Boolean>();
        for(int i=0;i<list.size();i++){
            isSelected.put(i,false);
        }
    }


    @Override
    public int getCount(){
        return list.size();
    }
    @Override
    public Object getItem(int pos){
        return list.get(pos);
    }
    @Override
    public long getItemId(int pos){
        return pos;
    }
    public final class ViewHolder{
        public ImageView img;
        public TextView name;
        public CheckBox checkBox;
    }
    @Override
    public View getView(int pos, View converView, ViewGroup parent){
        ViewHolder holder;
        View view;
        if(converView == null){
            holder = new ViewHolder();
            view = LayoutInflater.from(context).inflate(R.layout.listview_item,null);
            holder.img = (ImageView)view.findViewById(R.id.item_img);
            holder.name = (TextView)view.findViewById(R.id.item_name);
            holder.checkBox = (CheckBox)view.findViewById(R.id.item_cb);
            view.setTag(holder);
        }else{
            
            view = converView;
            holder = (ViewHolder)converView.getTag();
        }
        holder.img.setImageResource(R.drawable.document);
        holder.name.setText(list.get(pos));
        holder.checkBox.setChecked(isSelected.get(pos));
        return view;
    }

}

由于是简单的实现所以列表中的项目为事先编辑好的，实际应用中可以根据需要改为动态添加。
最后是弹出窗口的实现

public class MainActivity extends AppCompatActivity {
    private PopupWindow window;
    private List<String> file_list;

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

        Button show = (Button)findViewById(R.id.main_show);

        show.setOnClickListener(new View.OnClickListener(){
            @Override
            public void onClick(View v){
                popWindow(v);
            }
        });
    }

    private void closeWindow(boolean submit){
        if(submit){
            for(int i=0;i<file_list.size();i++){
                Log.i("名称",file_list.get(i));
            }
        }
        if(window!=null){
            window.dismiss();
        }
    }

    private void popWindow(View parent){
        file_list = new ArrayList<>();
        LayoutInflater layoutInflater=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
        View view = layoutInflater.inflate(R.layout.poptest,null);
        ListView listView = (ListView)view.findViewById(R.id.pop_list);
        Button ok = (Button)view.findViewById(R.id.pop_ok);
        Button cancel = (Button)view.findViewById(R.id.pop_cancel);
        ok.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                closeWindow(true);
            }
        });
        cancel.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                closeWindow(false);
            }
        });
        final PopAdapter popadpter = new PopAdapter(this);
        listView.setAdapter(popadpter);
        listView.setItemsCanFocus(false);
        listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

        listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                PopAdapter.ViewHolder holder = (PopAdapter.ViewHolder)view.getTag();
                holder.checkBox.toggle();
                popadpter.isSelected.put(i,holder.checkBox.isChecked());
                if(holder.checkBox.isChecked()){
                    file_list.add(holder.name.getText().toString());
                }else{
                    file_list.remove(holder.name.getText().toString());
                }
            }
        });

        window = new PopupWindow(view,500,300);
        window.setFocusable(true);
        window.update();
        window.showAtLocation(parent, Gravity.CENTER_VERTICAL,0,0);
    }

}

其中因为考虑到文件夹中的文件可能发生变化，所以在每次执行popWindow函数时都重新创建了适配器对象和其他相关对象，如果适配器内容是固定的，则更好的写法是

    private void popWindow(View parent){
        file_list = new ArrayList<>();
        if(window == null){
            LayoutInflater layoutInflater=(LayoutInflater)getSystemService(Context.LAYOUT_INFLATER_SERVICE);
            View view = layoutInflater.inflate(R.layout.poptest,null);
            ListView listView = (ListView)view.findViewById(R.id.pop_list);
            Button ok = (Button)view.findViewById(R.id.pop_ok);
            Button cancel = (Button)view.findViewById(R.id.pop_cancel);
            ok.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    closeWindow(true);
                }
            });
            cancel.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View view) {
                    closeWindow(false);
                }
            });
            final PopAdapter popadpter = new PopAdapter(this);
            listView.setAdapter(popadpter);
            listView.setItemsCanFocus(false);
            listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);
    
            listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
                @Override
                public void onItemClick(AdapterView<?> adapterView, View view, int i, long l) {
                    PopAdapter.ViewHolder holder = (PopAdapter.ViewHolder)view.getTag();
                    holder.checkBox.toggle();
                    popadpter.isSelected.put(i,holder.checkBox.isChecked());
                    if(holder.checkBox.isChecked()){
                        file_list.add(holder.name.getText().toString());
                    }else{
                        file_list.remove(holder.name.getText().toString());
                    }
                }
            });
    
            window = new PopupWindow(view,500,300);
        }
        window.setFocusable(true);
        window.update();
        window.showAtLocation(parent, Gravity.CENTER_VERTICAL,0,0);
    }

此时需要重新构建关闭弹出窗口时的代码，否则再次弹出的窗口中的checkbox的状态为上一次的状态。
总结一下完成此项目主要包含两个部分，第一部分为ListView，此部分的基本组成为listview布局、列表子项布局、适配器和在活动中的实现部分。第二部分为弹出窗口，这部分较为简单主要是PopupWindow的相应配置。

参考文章
http://gqdy365.iteye.com/blog/994746
http://blog.csdn.net/wangkuifeng0118/article/details/7368157