Android Open Source - WizardPager Multiple Choice Fragment

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2012 Roman Nurik/*from   www  .  j  ava 2s .  c o  m*/
 *
 * 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.tech.freak.wizardpager.ui;

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

import android.app.Activity;
import android.os.Bundle;
import android.os.Handler;
import android.support.v4.app.ListFragment;
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.tech.freak.wizardpager.R;
import com.tech.freak.wizardpager.model.MultipleFixedChoicePage;
import com.tech.freak.wizardpager.model.Page;

public class MultipleChoiceFragment extends ListFragment {
    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);
        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));
        }
    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View rootView = inflater.inflate(R.layout.fragment_page, container, false);
        ((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();
    }
}

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