Pop window 弹出背景变灰

package com.su.testpopwindow; import java.util.ArrayList; import android.content.Context; import android.graphics.drawable.BitmapDrawable; import android.graphics.drawable.ColorDrawable; import android.view.Gravity; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.view.ViewGroup.LayoutParams; import android.widget.AdapterView.OnItemClickListener; import android.widget.BaseAdapter; import android.widget.ListView; import android.widget.PopupWindow; import android.widget.TextView; import com.su.testpopwindow.R; public class PopMenu { private ArrayList<String> itemList; private Context context; private PopupWindow popupWindow; private ListView listView; // private OnItemClickListener listener; public PopMenu(Context context) { // TODO Auto-generated constructor stub this.context = context; itemList = new ArrayList<String>(5); View view = LayoutInflater.from(context) .inflate(R.layout.popmenu, null); // 设置 listview listView = (ListView) view.findViewById(R.id.listView); listView.setAdapter(new PopAdapter()); listView.setFocusableInTouchMode(true); listView.setFocusable(true); // popupWindow = new PopupWindow(view, context.getResources() // .getDimensionPixelSize(R.dimen.popmenu_width), // LayoutParams.WRAP_CONTENT); popupWindow = new PopupWindow(view, LayoutParams.FILL_PARENT,LayoutParams.FILL_PARENT, 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（很神奇的） ColorDrawable dw = new ColorDrawable(-00000); popupWindow.setBackgroundDrawable(dw); popupWindow.update(); } // 设置菜单项点击监听器 public void setOnItemClickListener(OnItemClickListener listener) { // this.listener = listener; listView.setOnItemClickListener(listener); } // 批量添加菜单项 public void addItems(String[] items) { for (String s : items) itemList.add(s); } // 单个添加菜单项 public void addItem(String item) { itemList.add(item); } // 下拉式 弹出 pop菜单 parent 右下角 public void showAsDropDown(View parent) { popupWindow.showAtLocation(parent,Gravity.CENTER, 0, 0); // popupWindow.showAsDropDown(parent, // 10, // // 保证尺寸是根据屏幕像素密度来的 // context.getResources().getDimensionPixelSize( // R.dimen.popmenu_yoff)); // 使其聚集 popupWindow.setFocusable(true); // 设置允许在外点击消失 popupWindow.setOutsideTouchable(true); // 刷新状态 popupWindow.update(); } // 隐藏菜单 public void dismiss() { popupWindow.dismiss(); } // 适配器 private final class PopAdapter extends BaseAdapter { @Override public int getCount() { // TODO Auto-generated method stub return itemList.size(); } @Override public Object getItem(int position) { // TODO Auto-generated method stub return itemList.get(position); } @Override public long getItemId(int position) { // TODO Auto-generated method stub return position; } @Override public View getView(int position, View convertView, ViewGroup parent) { // TODO Auto-generated method stub ViewHolder holder; if (convertView == null) { convertView = LayoutInflater.from(context).inflate( R.layout.pomenu_item, null); holder = new ViewHolder(); convertView.setTag(holder); holder.groupItem = (TextView) convertView .findViewById(R.id.textView); } else { holder = (ViewHolder) convertView.getTag(); } holder.groupItem.setText(itemList.get(position)); return convertView; } private final class ViewHolder { TextView groupItem; } } }