MainActivity.java

/*
 * Copyright (C) 2013 Ian G. Clifton
 * Code featured in Android User Interface Design: Turning Ideas and
 * Sketches into Beautifully Designed Apps (ISBN-10: 0321886739;
 * ISBN-13: 978-0321886736).
 *
 * 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.iangclifton.auid.appendixc;

import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentActivity;
import android.view.Window;

import com.iangclifton.auid.appendixc.sections.Section;
import com.iangclifton.auid.appendixc.sections.SectionActivity;

/**
 * An activity representing a list of Sections. This activity has different
 * presentations for handset and tablet-size devices. On handsets, the activity
 * presents a list of items, which when touched, lead to a
 * {@link SectionActivity} representing item details. On tablets, the
 * activity presents the list of items and item details side-by-side using two
 * vertical panes.
 * <p>
 * The activity makes heavy use of fragments. The list of items is a
 * {@link SectionListFragment} and the item details (if present) is a
 * {@link SectionDetailFragment}.
 * <p>
 * This activity also implements the required
 * {@link SectionListFragment.Callbacks} interface to listen for item
 * selections.
 */
public class MainActivity extends FragmentActivity implements SectionListFragment.Callbacks {

	/**
	 * Whether or not the activity is in two-pane mode, i.e. running on a tablet
	 * device.
	 */
	private boolean mTwoPane;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		getWindow().requestFeature(Window.FEATURE_PROGRESS);
		setProgressBarIndeterminate(true);

		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_section_list);

		if (findViewById(R.id.section_detail_container) != null) {
			// The detail container view will be present only in the
			// large-screen layouts (res/values-large and
			// res/values-sw600dp). If this view is present, then the
			// activity should be in two-pane mode.
			mTwoPane = true;

			// In two-pane mode, list items should be given the
			// 'activated' state when touched.
			((SectionListFragment) getSupportFragmentManager() .findFragmentById(R.id.section_list)).setActivateOnItemClick(true);
		}

	}

	/**
	 * Callback method from {@link SectionListFragment.Callbacks} indicating
	 * that the item with the given ID was selected.
	 */
	@Override
	public void onItemSelected(Section section) {
		if (mTwoPane) {
			Fragment fragment = section.getFragment();
			getSupportFragmentManager().beginTransaction().replace(R.id.section_detail_container, fragment).commit();
		} else {
			// In single-pane mode, simply start the detail activity
			// for the selected item ID.
			Intent detailIntent = new Intent(this, SectionActivity.class);
			detailIntent.putExtra(SectionActivity.ARG_SECTION, section);
			startActivity(detailIntent);
		}
	}
}