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
