Android Open Source - making-apps-beautiful Article List Activity

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License

The source code is released under:
Apache License
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Java Source Code

/*
 * Copyright 2013 The Android Open Source Project
 */*w  w  w . j a  va2s  .  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.example.xyzreader.cp2;

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

import com.example.xyzreader.cp2.dummy.DummyContent;

/**
 * An activity representing a list of Articles. 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 ArticleDetailActivity} 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 ArticleListFragment} and the item details (if present) is a
 * {@link ArticleDetailFragment}.
 * <p/>
 * This activity also implements the required
 * {@link ArticleListFragment.Callbacks} interface to listen for item
 * selections.
 */
public class ArticleListActivity extends FragmentActivity implements
        ArticleListFragment.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) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_article_list);

        if (findViewById(R.id.article_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.
            ((ArticleListFragment) getSupportFragmentManager()
                    .findFragmentById(R.id.article_list))
                    .setActivateOnItemClick(true);
        }

        if (savedInstanceState == null && mTwoPane) {
            Bundle arguments = new Bundle();
            arguments.putString(ArticleDetailFragment.ARG_ITEM_ID, DummyContent.ITEMS.get(0).id);
            ArticleDetailFragment fragment = new ArticleDetailFragment();
            fragment.setArguments(arguments);
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.article_detail_container, fragment).commit();
        }
    }

    /**
     * Callback method from {@link ArticleListFragment.Callbacks} indicating
     * that the item with the given ID was selected.
     */
    @Override
    public void onItemSelected(String id) {
        if (mTwoPane) {
            // In two-pane mode, show the detail view in this activity by
            // adding or replacing the detail fragment using a
            // fragment transaction.
            Bundle arguments = new Bundle();
            arguments.putString(ArticleDetailFragment.ARG_ITEM_ID, id);
            ArticleDetailFragment fragment = new ArticleDetailFragment();
            fragment.setArguments(arguments);
            getSupportFragmentManager().beginTransaction()
                    .replace(R.id.article_detail_container, fragment).commit();

        } else {
            // In single-pane mode, simply start the detail activity
            // for the selected item ID.
            Intent detailIntent = new Intent(this, ArticleDetailActivity.class);
            detailIntent.putExtra(ArticleDetailFragment.ARG_ITEM_ID, id);
            startActivity(detailIntent);
        }
    }
}
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