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

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License

The source code is released under:

Apache License

Java Source Code

/*
 * Copyright 2013 The Android Open Source Project
 *//from  ww w.java  2 s.co  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.cp4;

import android.app.Activity;
import android.app.Notification;
import android.app.NotificationManager;
import android.app.PendingIntent;
import android.content.Context;
import android.content.Intent;
import android.graphics.Bitmap;
import android.graphics.BitmapFactory;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.support.v4.app.NotificationCompat;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuInflater;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.TextView;

import com.example.xyzreader.cp4.dummy.DummyContent;

/**
 * A list fragment representing a list of Articles. This fragment also supports tablet devices by
 * allowing list items to be given an 'activated' state upon selection. This helps indicate which
 * item is currently being viewed in a {@link ArticleDetailFragment}. <p> Activities containing this
 * fragment MUST implement the {@link Callbacks} interface.
 */
public class ArticleListFragment extends ListFragment {

    /**
     * The serialization (saved instance state) Bundle key representing the activated item position.
     * Only used on tablets.
     */
    private static final String STATE_ACTIVATED_POSITION = "activated_position";

    /**
     * The fragment's current callback object, which is notified of list item clicks.
     */
    private Callbacks mCallbacks = sDummyCallbacks;

    /**
     * The current activated item position. Only used on tablets.
     */
    private int mActivatedPosition = ListView.INVALID_POSITION;


    /**
     * A callback interface that all activities containing this fragment must implement. This
     * mechanism allows activities to be notified of item selections.
     */
    public interface Callbacks {
        /**
         * Callback for when an item has been selected.
         */
        public void onItemSelected(String id);
    }

    /**
     * A dummy implementation of the {@link Callbacks} interface that does nothing. Used only when
     * this fragment is not attached to an activity.
     */
    private static Callbacks sDummyCallbacks = new Callbacks() {
        @Override
        public void onItemSelected(String id) {
        }
    };

    /**
     * Mandatory empty constructor for the fragment manager to instantiate the fragment (e.g. upon
     * screen orientation changes).
     */
    public ArticleListFragment() {
    }

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setListAdapter(new MyAdapter());
        setHasOptionsMenu(true);
    }

    @Override
    public void onViewCreated(View view, Bundle savedInstanceState) {
        super.onViewCreated(view, savedInstanceState);

        // Restore the previously serialized activated item position.
        if (savedInstanceState != null
                && savedInstanceState.containsKey(STATE_ACTIVATED_POSITION)) {
            setActivatedPosition(savedInstanceState
                    .getInt(STATE_ACTIVATED_POSITION));
        }
    }

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

        // Activities containing this fragment must implement its callbacks.
        if (!(activity instanceof Callbacks)) {
            throw new IllegalStateException(
                    "Activity must implement fragment's callbacks.");
        }

        mCallbacks = (Callbacks) activity;
    }

    @Override
    public void onDetach() {
        super.onDetach();

        // Reset the active callbacks interface to the dummy implementation.
        mCallbacks = sDummyCallbacks;
    }

    @Override
    public void onListItemClick(ListView listView, View view, int position,
                                long id) {
        super.onListItemClick(listView, view, position, id);

        // Notify the active callbacks interface (the activity, if the
        // fragment is attached to one) that an item has been selected.
        mCallbacks.onItemSelected(DummyContent.ITEMS.get(position).id);
    }

    @Override
    public void onSaveInstanceState(Bundle outState) {
        super.onSaveInstanceState(outState);
        if (mActivatedPosition != ListView.INVALID_POSITION) {
            // Serialize and persist the activated item position.
            outState.putInt(STATE_ACTIVATED_POSITION, mActivatedPosition);
        }
    }

    /**
     * Turns on activate-on-click mode. When this mode is on, list items will be given the
     * 'activated' state when touched.
     */
    public void setActivateOnItemClick(boolean activateOnItemClick) {
        // When setting CHOICE_MODE_SINGLE, ListView will automatically
        // give items the 'activated' state when touched.
        getListView().setChoiceMode(
                activateOnItemClick ? ListView.CHOICE_MODE_SINGLE
                        : ListView.CHOICE_MODE_NONE);
    }

    private void setActivatedPosition(int position) {
        if (position == ListView.INVALID_POSITION) {
            getListView().setItemChecked(mActivatedPosition, false);
        } else {
            getListView().setItemChecked(position, true);
        }

        mActivatedPosition = position;
    }

    @Override
    public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
        inflater.inflate(R.menu.main, menu);
    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        if (item.getItemId() == R.id.refresh) {
            DummyContent.DummyItem dummy = DummyContent.ITEMS.get(0);

            BitmapFactory.Options options = new BitmapFactory.Options();
            options.inSampleSize = 16;
            Bitmap photo = BitmapFactory.decodeResource(getResources(), dummy.photoResId);

            Notification n = new NotificationCompat.Builder(getActivity())
                    .setContentTitle("Article published")
                    .setSmallIcon(R.drawable.stat_icon)
                    .setDefaults(Notification.DEFAULT_SOUND)
                    .setLargeIcon(photo)
                    .setStyle(new NotificationCompat.BigPictureStyle()
                            .bigPicture(photo)
                            .setSummaryText(dummy.title))
                    .setContentText(dummy.title)
                    .setContentIntent(PendingIntent.getActivity(getActivity(), 0,
                            new Intent(getActivity(), getActivity().getClass()),
                            PendingIntent.FLAG_UPDATE_CURRENT))
                    .setAutoCancel(true)
                    .addAction(R.drawable.ic_share, "Share",
                            PendingIntent.getActivity(getActivity(), 0,
                                    new Intent(getActivity(), getActivity().getClass()),
                                    PendingIntent.FLAG_UPDATE_CURRENT))
                    .build();
            NotificationManager nm = (NotificationManager) getActivity().getSystemService(Context.NOTIFICATION_SERVICE);
            nm.notify(1, n);
            return true;
        }
        return super.onOptionsItemSelected(item);
    }

    private class MyAdapter extends BaseAdapter {
        @Override
        public int getCount() {
            return DummyContent.ITEMS.size();
        }

        @Override
        public Object getItem(int position) {
            return DummyContent.ITEMS.get(position);
        }

        @Override
        public long getItemId(int position) {
            return DummyContent.ITEMS.get(position).id.hashCode();
        }

        @Override
        public View getView(int position, View convertView, ViewGroup container) {
            if (convertView == null) {
                convertView = LayoutInflater.from(getActivity())
                        .inflate(R.layout.list_item_article, container, false);
            }

            final DummyContent.DummyItem item = (DummyContent.DummyItem) getItem(position);
            ((TextView) convertView.findViewById(R.id.article_title)).setText(item.title);
            ((TextView) convertView.findViewById(R.id.article_subtitle)).setText(
                    item.time + " by " + item.author);

            Bitmap b = BitmapFactory.decodeResource(getResources(), item.photoResId);
            ((ImageView) convertView.findViewById(R.id.thumbnail)).setImageBitmap(b);


            return convertView;
        }
    }
}

Java Source Code List

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