Android Open Source - BART View Count Down Timer

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License

The source code is released under:

GNU General Public License

Java Source Code

/*
 *  Copyright (C) 2012  David Brodsky//from w  w w  . j  ava 2 s. co m
 *  This file is part of Open BART.
 *
 *  Open BART 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, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  Open BART 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
 *  along with Open BART.  If not, see <http://www.gnu.org/licenses/>.
*/


package pro.dbro.bart;

import java.util.ArrayList;
import java.util.Date;
import android.content.Intent;
import android.os.CountDownTimer;
import android.support.v4.content.LocalBroadcastManager;
import android.util.Log;
import android.view.View;
import android.view.ViewGroup;
import android.view.ViewParent;
import android.widget.TextView;

public class ViewCountDownTimer extends CountDownTimer {
  
  // views to be counted down by timer
  ArrayList timerViews;
  // type of request: "etd" or "route" This reveals the format of views within timerViews
  String request;
  
  // absolute time when countdown will be finished in ms since 1970
  public static long expiryTime;
  
  static final long DEPARTING_TRAIN_PADDING_MS = 15*1000; // how long after departure should we display train?
                                // since timer polls only once per minute setting <60s
                                // only effectively removes trains leaving when request is first sent
  static final long MINIMUM_TICK_MS = 1*1000; // disable timer from ticking onStart(); Causes flickering when set on view that has just been
                         // populated with a time. 
  final long MINIMUM_TIME_FOR_REFRESH_MS = 60 * 1000; // If the timer is initialized with a time 
                            // less than this value, don't request new data
                            // on timer expiry
  private long COUNTDOWN_TIME_MS; // initial countdown time

  public ViewCountDownTimer(long millisInFuture, long countDownInterval) {
    super(millisInFuture, countDownInterval);
    // TODO Auto-generated constructor stub
  }
  public ViewCountDownTimer(ArrayList tViews, String request, long millisInFuture, long countDownInterval) {
    super(millisInFuture, countDownInterval);
    COUNTDOWN_TIME_MS = millisInFuture;
    timerViews = tViews;
    this.request = request;
    expiryTime = new Date().getTime() + millisInFuture;
    
  }

  @Override
  public void onFinish() {
    // TODO Auto-generated method stub
    // broadcast message to TheActivity to refresh data from the BART API
    if(COUNTDOWN_TIME_MS > MINIMUM_TIME_FOR_REFRESH_MS)
      sendMessage(2);
  }

  @Override
  public void onTick(long millisUntilFinished) {
    // Prevent timer from ticking within MINIMUM_TICK_MS of beginning
    // Prevents unnecessary view re-drawing, assuming UI initial data is updated before timer set
    if(COUNTDOWN_TIME_MS - millisUntilFinished < MINIMUM_TICK_MS){
      return;
    }
    // Get current time in MS since '70
    long now = new Date().getTime();
    
    for(int x=0;x<timerViews.size();x++){
      // ETA tagged on TimerView is ms since '70
      long eta = (Long) ((TextView)timerViews.get(x)).getTag();
      
      // If train was scheduled to leave more than DEPARTING_TRAIN_PADDING_MS ago, remove it from view
      if((eta + DEPARTING_TRAIN_PADDING_MS - now ) < 0){
        // If an etd or route countdown has expired, hide it's view
        try{
          if(request.compareTo("route") == 0){
  
            View parent = ((View) ((TextView)timerViews.get(x)).getParent());
            route thisRoute = (route)parent.getTag();
            parent.setVisibility(View.GONE);
            if (thisRoute.isExpanded){
              ViewGroup grandparent = (ViewGroup) parent.getParent();
              //if route view is expanded, the next row in Table will be route detail
              grandparent.getChildAt((grandparent.indexOfChild(parent)+1)).setVisibility(View.GONE);
            }
            //tableLayout.removeView((View)((View)timerViews.get(x)).getParent());
          }
          else if(request.compareTo("etd") == 0){
            ((TextView)timerViews.get(x)).setVisibility(View.GONE);
          }
        }catch(Throwable t){
          // removing departed trains is a 'garnish' so let's not 
          // worry TOO much if some weird casting exception crops up
        }
        
      }
      // Else if train was scheduled to leave less than DEPARTING_TRAIN_PADDING_MS ago, show it in view, but set eta = 0
      // set eta = 0 tied to display "<1m". Due to integer division time between 0 and 60*1000-1 ms will be displayed as 0
      else if((eta - now ) <= 60*1000){
        eta = 0;
      }
      else{
        eta = eta - now;
      }
      // Display 0 eta as "<1"
      if(eta == 0)
        ((TextView)timerViews.get(x)).setText("<1");
      else
        ((TextView)timerViews.get(x)).setText(String.valueOf((eta) / ( 1000 *60)));
    }
  }
  
  private void sendMessage(int status) { // 0 = service stopped , 1 = service started, 2 = refresh view with call to bartApiRequest()
      Log.d("sender", "View countdown expired");
      Intent intent = new Intent("service_status_change");
      // You can also include some extra data.
      intent.putExtra("status", status);
      intent.putExtra("request", request);
      LocalBroadcastManager.getInstance(TheActivity.c).sendBroadcast(intent);
    }

}

Java Source Code List

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