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      1 /*
      2  * Copyright (C) 2013 The Android Open Source Project
      3  *
      4  * Licensed under the Apache License, Version 2.0 (the "License");
      5  * you may not use this file except in compliance with the License.
      6  * You may obtain a copy of the License at
      7  *
      8  *      http://www.apache.org/licenses/LICENSE-2.0
      9  *
     10  * Unless required by applicable law or agreed to in writing, software
     11  * distributed under the License is distributed on an "AS IS" BASIS,
     12  * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     13  * See the License for the specific language governing permissions and
     14  * limitations under the License.
     15  */
     16 package com.example.android.actionbarcompat.listpopupmenu;
     17 
     18 import android.os.Bundle;
     19 import android.support.v4.app.ListFragment;
     20 import android.support.v7.widget.PopupMenu;
     21 import android.view.MenuItem;
     22 import android.view.View;
     23 import android.view.ViewGroup;
     24 import android.widget.ArrayAdapter;
     25 import android.widget.ListView;
     26 import android.widget.Toast;
     27 
     28 import java.util.ArrayList;
     29 
     30 /**
     31  * This ListFragment displays a list of cheeses, with a clickable view on each item whichs displays
     32  * a {@link android.support.v7.widget.PopupMenu PopupMenu} when clicked, allowing the user to
     33  * remove the item from the list.
     34  */
     35 public class PopupListFragment extends ListFragment implements View.OnClickListener {
     36 
     37     @Override
     38     public void onActivityCreated(Bundle savedInstanceState) {
     39         super.onActivityCreated(savedInstanceState);
     40 
     41         // We want to allow modifications to the list so copy the dummy data array into an ArrayList
     42         ArrayList<String> items = new ArrayList<String>();
     43         for (int i = 0, z = Cheeses.CHEESES.length ; i < z ; i++) {
     44             items.add(Cheeses.CHEESES[i]);
     45         }
     46 
     47         // Set the ListAdapter
     48         setListAdapter(new PopupAdapter(items));
     49     }
     50 
     51     @Override
     52     public void onListItemClick(ListView listView, View v, int position, long id) {
     53         String item = (String) listView.getItemAtPosition(position);
     54 
     55         // Show a toast if the user clicks on an item
     56         Toast.makeText(getActivity(), "Item Clicked: " + item, Toast.LENGTH_SHORT).show();
     57     }
     58 
     59     @Override
     60     public void onClick(final View view) {
     61         // We need to post a Runnable to show the popup to make sure that the PopupMenu is
     62         // correctly positioned. The reason being that the view may change position before the
     63         // PopupMenu is shown.
     64         view.post(new Runnable() {
     65             @Override
     66             public void run() {
     67                 showPopupMenu(view);
     68             }
     69         });
     70     }
     71 
     72     // BEGIN_INCLUDE(show_popup)
     73     private void showPopupMenu(View view) {
     74         final PopupAdapter adapter = (PopupAdapter) getListAdapter();
     75 
     76         // Retrieve the clicked item from view's tag
     77         final String item = (String) view.getTag();
     78 
     79         // Create a PopupMenu, giving it the clicked view for an anchor
     80         PopupMenu popup = new PopupMenu(getActivity(), view);
     81 
     82         // Inflate our menu resource into the PopupMenu's Menu
     83         popup.getMenuInflater().inflate(R.menu.popup, popup.getMenu());
     84 
     85         // Set a listener so we are notified if a menu item is clicked
     86         popup.setOnMenuItemClickListener(new PopupMenu.OnMenuItemClickListener() {
     87             @Override
     88             public boolean onMenuItemClick(MenuItem menuItem) {
     89                 switch (menuItem.getItemId()) {
     90                     case R.id.menu_remove:
     91                         // Remove the item from the adapter
     92                         adapter.remove(item);
     93                         return true;
     94                 }
     95                 return false;
     96             }
     97         });
     98 
     99         // Finally show the PopupMenu
    100         popup.show();
    101     }
    102     // END_INCLUDE(show_popup)
    103 
    104     /**
    105      * A simple array adapter that creates a list of cheeses.
    106      */
    107     class PopupAdapter extends ArrayAdapter<String> {
    108 
    109         PopupAdapter(ArrayList<String> items) {
    110             super(getActivity(), R.layout.list_item, android.R.id.text1, items);
    111         }
    112 
    113         @Override
    114         public View getView(int position, View convertView, ViewGroup container) {
    115             // Let ArrayAdapter inflate the layout and set the text
    116             View view = super.getView(position, convertView, container);
    117 
    118             // BEGIN_INCLUDE(button_popup)
    119             // Retrieve the popup button from the inflated view
    120             View popupButton = view.findViewById(R.id.button_popup);
    121 
    122             // Set the item as the button's tag so it can be retrieved later
    123             popupButton.setTag(getItem(position));
    124 
    125             // Set the fragment instance as the OnClickListener
    126             popupButton.setOnClickListener(PopupListFragment.this);
    127             // END_INCLUDE(button_popup)
    128 
    129             // Finally return the view to be displayed
    130             return view;
    131         }
    132     }
    133 
    134 }
    135