Android Open Source - Android-Paginated-ListView-Demo Abstract List View Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 * Copyright (C) 2012 Daniel Medina <http://danielme.com>
 * /*w w w.j  a  va  2 s.co m*/
 * This file is part of "Android Paginated ListView Demo".
 * 
 * "Android Paginated ListView Demo" is free software: you can redistribute it and/or modify
 * it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, version 3.
 *
 * "Android Paginated ListView Demo" is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License version 3
 * along with this program.  If not, see <http://www.gnu.org/licenses/gpl-3.0.html/>
 */
package com.danielme.blog.android.paginatedlistview.activities;

import java.util.List;

import com.danielme.blog.android.paginatedlistview.CustomArrayAdapter;
import com.danielme.blog.android.paginatedlistview.Datasource;
import com.danielme.blog.android.paginatedlistview.R;

import android.app.ListActivity;
import android.os.AsyncTask;
import android.util.Log;
import android.view.View;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;

public abstract class AbstractListViewActivity extends ListActivity
{

  protected Datasource datasource;

  protected static final int PAGESIZE = 10;

  protected TextView textViewDisplaying;

  protected View footerView;

  protected boolean loading = false;

  protected class LoadNextPage extends AsyncTask<String, Void, String>
  {
    private List<String> newData = null;

    @Override
    protected String doInBackground(String... arg0)
    {
      // para que de tiempo a ver el footer ;)
      try
      {
        Thread.sleep(1500);
      }
      catch (InterruptedException e)
      {
        Log.e("AbstractListActivity", e.getMessage());
      }
      newData = datasource.getData(getListAdapter().getCount(), PAGESIZE);
      return null;
    }

    @Override
    protected void onPostExecute(String result)
    {
      CustomArrayAdapter customArrayAdapter = ((CustomArrayAdapter) getListAdapter());
      for (String value : newData)
      {
        customArrayAdapter.add(value);
      }
      customArrayAdapter.notifyDataSetChanged();

      getListView().removeFooterView(footerView);
      updateDisplayingTextView();
      loading = false;
    }

  }

  protected void updateDisplayingTextView()
  {
    textViewDisplaying = (TextView) findViewById(R.id.displaying);
    String text = getString(R.string.display);
    text = String.format(text, getListAdapter().getCount(), datasource.getSize());
    textViewDisplaying.setText(text);
  }

  @Override
  protected void onListItemClick(ListView l, View v, int position, long id)
  {
    Toast.makeText(this, getListAdapter().getItem(position) + " " + getString(R.string.selected), Toast.LENGTH_SHORT).show();
  }
  
  protected boolean load(int firstVisibleItem, int visibleItemCount, int totalItemCount)
  {
    boolean lastItem = firstVisibleItem + visibleItemCount == totalItemCount && getListView().getChildAt(visibleItemCount -1) != null && getListView().getChildAt(visibleItemCount-1).getBottom() <= getListView().getHeight();
    boolean moreRows = getListAdapter().getCount() < datasource.getSize();
    return moreRows && lastItem && !loading;
    
  }
}

Java Source Code List

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