NavigationDrawerFragment.java

/*
 * Copyright 2012-2015 One Platform Foundation
 *
 * 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 org.onepf.pushchat.ui.fragment;

import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.ListView;
import org.onepf.pushchat.R;
import org.onepf.pushchat.controller.StateController;
import org.onepf.pushchat.ui.ContentFragmentFactory;
import org.onepf.pushchat.ui.fragment.content.BaseContentFragment;
import org.onepf.pushchat.ui.fragment.content.MessagesFragment;
import org.onepf.pushchat.ui.fragment.content.StateFragment;
import org.onepf.pushchat.utils.FragmentUtils;

import static org.onepf.pushchat.model.PushState.REGISTERED;

public class NavigationDrawerFragment extends BaseFragment {

    private static final String FIRST_SELECTED_POSITION_KEY = "FIRST_SELECTED_POSITION_KEY";
    private static final String STATE_SELECTED_POSITION_KEY = "STATE_SELECTED_POSITION_KEY";

    private ListView drawerListView;

    private int firstFragmentPosition;

    private int currentSelectedPosition;

    private String[] titles;

    public static NavigationDrawerFragment newInstance() {
        return new NavigationDrawerFragment();
    }

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

        titles = new String[]{
                getString(R.string.title_state_fragment),
                getString(R.string.title_topics_fragment),
                getString(R.string.title_messages_fragment),
                getString(R.string.title_contacts_fragment),
                getString(R.string.title_about_fragment)
        };

        if (savedInstanceState == null) {
            firstFragmentPosition = StateController.getState(getActivity()) == REGISTERED
                    ? MessagesFragment.POSITION
                    : StateFragment.POSITION;
            currentSelectedPosition = firstFragmentPosition;
        } else {
            firstFragmentPosition = savedInstanceState.getInt(FIRST_SELECTED_POSITION_KEY);
            currentSelectedPosition = savedInstanceState.getInt(STATE_SELECTED_POSITION_KEY);
        }
    }

    @Override
    public View onCreateView(@NonNull final LayoutInflater inflater,
                             @Nullable final ViewGroup container,
                             @Nullable final Bundle savedInstanceState) {
        drawerListView = (ListView) inflater.inflate(R.layout.fragment_navigation_drawer, container, false);
        drawerListView.setAdapter(new ArrayAdapter<>(
                getActivity(),
                R.layout.item_navigation_drawer,
                R.id.drawer_item_text,
                titles
        ));
        drawerListView.setOnItemClickListener(onItemClickListener());
        drawerListView.setItemChecked(currentSelectedPosition, true);
        return drawerListView;
    }

    @SuppressWarnings("AssignmentToNull")
    @Override
    public void onDestroyView() {
        super.onDestroyView();
        drawerListView = null;
    }

    public void setItemChecked(final int position) {
        currentSelectedPosition = position;
        if (drawerListView != null) {
            drawerListView.setItemChecked(position, true);
        }
    }

    public void selectItem(final int position) {
        selectItem(position, false);
    }

    private void selectItem(final int position, final boolean addToBackStack) {
        final BaseContentFragment contentFragment = ContentFragmentFactory.getFragmentByPosition(position);
        FragmentUtils.replace(getFragmentManager(), contentFragment, contentFragment.getClass().getName(), addToBackStack);

        closeDrawer();
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        outState.putInt(FIRST_SELECTED_POSITION_KEY, firstFragmentPosition);
        outState.putInt(STATE_SELECTED_POSITION_KEY, currentSelectedPosition);
    }

    private AdapterView.OnItemClickListener onItemClickListener() {
        return new AdapterView.OnItemClickListener() {
            @Override
            public void onItemClick(final AdapterView<?> parent, final View view, final int position, final long id) {
                if (position == firstFragmentPosition) {
                    getFragmentManager().popBackStack();
                }
                selectItem(position, currentSelectedPosition == firstFragmentPosition);
            }
        };
    }
}