MultipleChoiceFragment.java

/*
 * Copyright 2012 Roman Nurik
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.dozuki.ifixit.ui.guide.create.wizard;

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.util.SparseBooleanArray;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import android.widget.TextView;

import com.dozuki.ifixit.R;
import com.dozuki.ifixit.model.guide.wizard.MultipleFixedChoicePage;
import com.dozuki.ifixit.model.guide.wizard.Page;
import com.dozuki.ifixit.ui.BaseListFragment;

import java.util.ArrayList;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

public class MultipleChoiceFragment extends BaseListFragment {
   private static final String ARG_KEY = "key";

   private PageFragmentCallbacks mCallbacks;
   private String mKey;
   private List<String> mChoices;
   private Page mPage;

   public static MultipleChoiceFragment create(String key) {
      Bundle args = new Bundle();
      args.putString(ARG_KEY, key);

      MultipleChoiceFragment fragment = new MultipleChoiceFragment();
      fragment.setArguments(args);
      return fragment;
   }

   public MultipleChoiceFragment() {
   }

   @Override
   public void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      Bundle args = getArguments();
      mKey = args.getString(ARG_KEY);
   }

   @Override
   public View onCreateView(LayoutInflater inflater, ViewGroup container,
    Bundle savedInstanceState) {
      View rootView = inflater.inflate(R.layout.wizard_fragment_page, container, false);
      mPage = mCallbacks.onGetPage(mKey);

      MultipleFixedChoicePage fixedChoicePage = (MultipleFixedChoicePage) mPage;
      mChoices = new ArrayList<String>();
      for (int i = 0; i < fixedChoicePage.getOptionCount(); i++) {
         mChoices.add(fixedChoicePage.getOptionAt(i));
      }


      ((TextView) rootView.findViewById(android.R.id.title)).setText(mPage.getTitle());

      final ListView listView = (ListView) rootView.findViewById(android.R.id.list);
      setListAdapter(new ArrayAdapter<String>(getActivity(),
       android.R.layout.simple_list_item_multiple_choice,
       android.R.id.text1,
       mChoices));
      listView.setChoiceMode(ListView.CHOICE_MODE_MULTIPLE);

      // Pre-select currently selected items.
      new Handler().post(new Runnable() {
         @Override
         public void run() {
            ArrayList<String> selectedItems = mPage.getData().getStringArrayList(
             Page.SIMPLE_DATA_KEY);
            if (selectedItems == null || selectedItems.size() == 0) {
               return;
            }

            Set<String> selectedSet = new HashSet<String>(selectedItems);

            for (int i = 0; i < mChoices.size(); i++) {
               if (selectedSet.contains(mChoices.get(i))) {
                  listView.setItemChecked(i, true);
               }
            }
         }
      });

      return rootView;
   }

   @Override
   public void onAttach(Activity activity) {
      super.onAttach(activity);

      if (!(activity instanceof PageFragmentCallbacks)) {
         throw new ClassCastException("Activity must implement PageFragmentCallbacks");
      }

      mCallbacks = (PageFragmentCallbacks) activity;
   }

   @Override
   public void onDetach() {
      super.onDetach();
      mCallbacks = null;
   }

   @Override
   public void onListItemClick(ListView l, View v, int position, long id) {
      SparseBooleanArray checkedPositions = getListView().getCheckedItemPositions();
      ArrayList<String> selections = new ArrayList<String>();
      for (int i = 0; i < checkedPositions.size(); i++) {
         if (checkedPositions.valueAt(i)) {
            selections.add(getListAdapter().getItem(checkedPositions.keyAt(i)).toString());
         }
      }

      mPage.getData().putStringArrayList(Page.SIMPLE_DATA_KEY, selections);
      mPage.notifyDataChanged();
   }
}