Android Open Source - cdb-android Travel Activity

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License

The source code is released under:

GNU General Public License

Java Source Code

package ca.strangeware.cdb;
//from www  .j  a v a2s  .c  om
import ca.strangeware.cdb.Schema.SchemaException;
import android.app.Activity;
import android.app.ListActivity;
import android.content.Intent;
import android.database.Cursor;
import android.os.Bundle;
import android.os.Handler;
import android.view.View;
import android.widget.AdapterView;
import android.widget.SimpleCursorAdapter;

public abstract class TravelActivity extends ListActivity {
  private Handler handler = new Handler();
  private long   startTime = 0;

  private class Update implements Runnable {
    private TravelActivity act;
    public Update(TravelActivity act) {
      this.act = act;
    }
    
    public void run() {
      this.act.populate();
    }
  }

  protected abstract Cursor  query() throws SchemaException;
  protected abstract Intent  intent(long id);
  protected abstract String[] columnNames();
  protected abstract String  title();
  protected abstract void    updateObjects();
  protected abstract int    arrivalIndex();
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    this.startTime = System.currentTimeMillis();
    final Activity a = this;
    getListView().setOnItemClickListener(new AdapterView.OnItemClickListener() {

      public void onItemClick(AdapterView<?> lv, View v, int pos, long pickup_id) {
        try {
          a.startActivity(intent(pickup_id));
        } catch ( Exception e ) {
          e.printStackTrace();
        }
      }
    });
    populate();
  }
  
  protected void populate() {
    // http://www.helloandroid.com/tutorials/using-threads-and-progressdialog
    updateObjects();
    setTitle(title() + formatExpired());
    try {
      Cursor cr = query();
      startManagingCursor(cr);
      setListAdapter(buildTripsAdapter(cr));
    } catch (SchemaException e) {
      setListAdapter(null);
    }
    this.handler.postDelayed(new Update(this), 60000);
  }

  private String formatExpired() {
    long   mins = secondsRunning() / 60;
    String rv = "";
    if ( mins > 0 ) {
      rv = " (" + mins + " minute" + ((mins > 1) ? "s" : "") + ")";
    }
    return rv;
  }
  
  protected long secondsRunning() {
    return (System.currentTimeMillis() - this.startTime) / 1000;
  }
  
  private SimpleCursorAdapter buildTripsAdapter(Cursor cr) {
    String[] fr = columnNames();
    int[]    to = new int[] { R.id.tr_number, R.id.tr_name };
    return new TravelCursorAdapter(this, R.layout.travel_row, cr, fr, to, this.arrivalIndex());
  }    
}

Java Source Code List

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