com.android.transmart.UI.fragments.PlaceListFragment.java Source code

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Here is the source code for com.android.transmart.UI.fragments.PlaceListFragment.java

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/*
 * Copyright 2011 Google Inc.
 *
 * 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.android.transmart.UI.fragments;

import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.support.v4.app.ListFragment;
import android.support.v4.app.LoaderManager.LoaderCallbacks;
import android.support.v4.content.CursorLoader;
import android.support.v4.content.Loader;
import android.support.v4.widget.SimpleCursorAdapter;
import android.view.View;
import android.widget.ListView;

import com.android.transmart.PlaceActivity;
import com.android.transmart.location.LocationConstants;
import com.android.transmart.providers.PlacesContentProvider;
import com.android.transmart.services.PlaceDetailsUpdateService;

// TODO Update this UI to show a better list of available venues. This could include
// TODO pictures, direction, more detailed text, etc. You will likely want to define
// TODO your own List Item Layout. 

/**
 * UI Fragment to show a list of venues near to the users current location.
 */
public class PlaceListFragment extends ListFragment implements LoaderCallbacks<Cursor> {

    protected Cursor cursor = null;
    protected SimpleCursorAdapter adapter;
    protected PlaceActivity activity;

    @Override
    public void onActivityCreated(Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);

        activity = (PlaceActivity) getActivity();

        // Create a new SimpleCursorAdapter that displays the name of each nearby
        // venue and the current distance to it.
        adapter = new SimpleCursorAdapter(activity, android.R.layout.two_line_list_item, cursor,
                new String[] { PlacesContentProvider.KEY_NAME, PlacesContentProvider.KEY_DISTANCE },
                new int[] { android.R.id.text1, android.R.id.text2 }, 0);
        // Allocate the adapter to the List displayed within this fragment.
        setListAdapter(adapter);

        // Populate the adapter / list using a Cursor Loader. 
        getLoaderManager().initLoader(0, null, this);
    }

    /**
     * {@inheritDoc}
     * When a venue is clicked, fetch the details from your server and display the detail page.
     */
    @Override
    public void onListItemClick(ListView l, View v, int position, long theid) {
        super.onListItemClick(l, v, position, theid);

        // Find the ID and Reference of the selected venue.
        // These are needed to perform a lookup in our cache and the Google Places API server respectively.
        Cursor c = adapter.getCursor();
        c.moveToPosition(position);
        String reference = c.getString(c.getColumnIndex(PlacesContentProvider.KEY_REFERENCE));
        String id = c.getString(c.getColumnIndex(PlacesContentProvider.KEY_ID));

        // Initiate a lookup of the venue details usign the PlacesDetailsUpdateService.
        // Because this is a user initiated action (rather than a prefetch) we request
        // that the Service force a refresh.
        Intent serviceIntent = new Intent(activity, PlaceDetailsUpdateService.class);
        serviceIntent.putExtra(LocationConstants.EXTRA_KEY_REFERENCE, reference);
        serviceIntent.putExtra(LocationConstants.EXTRA_KEY_ID, id);
        serviceIntent.putExtra(LocationConstants.EXTRA_KEY_FORCEREFRESH, true);
        activity.startService(serviceIntent);

        // Request the parent Activity display the venue detail UI.
        activity.selectDetail(reference, id);
    }

    /**
     * {@inheritDoc}
     * This loader will return the ID, Reference, Name, and Distance of all the venues
     * currently stored in the {@link PlacesContentProvider}.
     */
    public Loader<Cursor> onCreateLoader(int id, Bundle args) {
        String[] projection = new String[] { PlacesContentProvider.KEY_ID, PlacesContentProvider.KEY_NAME,
                PlacesContentProvider.KEY_DISTANCE, PlacesContentProvider.KEY_REFERENCE };

        return new CursorLoader(activity, PlacesContentProvider.CONTENT_URI, projection, null, null, null);
    }

    /**
     * {@inheritDoc}
     * When the loading has completed, assign the cursor to the adapter / list.
     */
    public void onLoadFinished(Loader<Cursor> loader, Cursor data) {
        adapter.swapCursor(data);
    }

    /**
     * {@inheritDoc}
     */
    public void onLoaderReset(Loader<Cursor> loader) {
        adapter.swapCursor(null);
    }
}