Android组件popupwindow使用方法详解

package jk.activity;

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

import android.app.Activity;
import android.content.Context;
import android.graphics.drawable.BitmapDrawable;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.WindowManager;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.PopupWindow;
import android.widget.TextView;
import android.widget.Toast;

public class PoupWindowDemoActivity extends Activity {

 private PopupWindow popupWindow;

 private ListView lv_group;

 private View view;

 private View top_title;

 private TextView tvtitle;

 private List groups;
 
 private Button button;
 public void onCreate(Bundle savedInstanceState) {
 super.onCreate(savedInstanceState);
 setContentView(R.layout.main);
 button = (Button)findViewById(R.id.bb);
 top_title = this.findViewById(R.id.top_title);

 tvtitle = (TextView) top_title.findViewById(R.id.tvtitle);

 tvtitle.setText("天下第一");

 tvtitle.setOnClickListener(new View.OnClickListener() {

 @Override
 public void onClick(View v) {
 showWindow(v);
 }
 });

 }

 /**
 * 显示
 * 
 * @param parent
 */
 private void showWindow(View parent) {

 if (popupWindow == null) {
 LayoutInflater layoutInflater = (LayoutInflater) getSystemService(Context.LAYOUT_INFLATER_SERVICE);

 view = layoutInflater.inflate(R.layout.group_list, null);

 lv_group = (ListView) view.findViewById(R.id.lvGroup);
 // 加载数据
 groups = new ArrayList();
 groups.add("女儿国");
 groups.add("西游");
 groups.add("大话");
 groups.add("大唐");

 GroupAdapter groupAdapter = new GroupAdapter(this, groups);
 lv_group.setAdapter(groupAdapter);
 // 创建一个PopuWidow对象
 popupWindow = new PopupWindow(view, 200, 250);
 }

 // 使其聚集
 popupWindow.setFocusable(true);
 // 设置允许在外点击消失
 popupWindow.setOutsideTouchable(true);

 // 这个是为了点击“返回Back”也能使其消失，并且并不会影响你的背景
 popupWindow.setBackgroundDrawable(new BitmapDrawable());
 WindowManager windowManager = (WindowManager) getSystemService(Context.WINDOW_SERVICE);
 // 显示的位置为:屏幕的宽度的一半-PopupWindow的高度的一半
 int xPos = windowManager.getDefaultDisplay().getWidth() / 2
 - popupWindow.getWidth() / 2;

 Log.i("coder", "windowManager.getDefaultDisplay().getWidth()/2:"
 + windowManager.getDefaultDisplay().getWidth() / 2);
 //
 Log.i("coder", "popupWindow.getWidth()/2:" + popupWindow.getWidth() / 2);

 Log.i("coder", "xPos:" + xPos);

 popupWindow.showAsDropDown(parent, xPos, 0);

 lv_group.setOnItemClickListener(new OnItemClickListener() {

 @Override
 public void onItemClick(AdapterView> adapterView, View view,
 int position, long id) {

 Toast.makeText(PoupWindowDemoActivity.this,
 "groups.get(position)" + groups.get(position), 1000)
 .show();

 if (popupWindow != null) {
 popupWindow.dismiss();
 }
 }
 });
 }
}

package jk.activity;

import java.util.List;



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

public class GroupAdapter extends BaseAdapter {

 private Context context;

 private List list;

 public GroupAdapter(Context context, List list) {

 this.context = context;
 this.list = list;

 }

 @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 viewGroup) {

 
 ViewHolder holder;
 if (convertView==null) {
 convertView=LayoutInflater.from(context).inflate(R.layout.group_item_view, null);
 holder=new ViewHolder();
 
 convertView.setTag(holder);
 
 holder.groupItem=(TextView) convertView.findViewById(R.id.groupItem);
 
 }
 else{
 holder=(ViewHolder) convertView.getTag();
 }
 holder.groupItem.setText(list.get(position));
 
 return convertView;
 }

 static class ViewHolder {
 TextView groupItem;
 }

}