Android Open Source - ubihelper Channel View Activity

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From Project

Back to project page ubihelper.

License

The source code is released under:

GNU General Public License

Java Source Code

/**
 * Copyright (c) 2012 The University of Nottingham
 * //w ww . j  av  a 2s  . c  o m
 * This file is part of ubihelper
 *
 *  ubihelper is free software: you can redistribute it and/or modify
 *  it under the terms of the GNU Affero General Public License as published by
 *  the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 *  ubihelper 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 Affero General Public License for more details.
 *
 *  You should have received a copy of the GNU Affero General Public License
 *  along with ubihelper. If not, see <http://www.gnu.org/licenses/>.
 *  
 *  @author Chris Greenhalgh (cmg@cs.nott.ac.uk), The University of Nottingham
 */
package uk.ac.horizon.ubihelper.ui;

import uk.ac.horizon.ubihelper.service.BroadcastIntentSubscription;
import uk.ac.horizon.ubihelper.service.Service;
import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.ComponentName;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.content.ServiceConnection;
import android.os.IBinder;
import android.util.Log;

/**
 * @author cmg
 *
 */
public abstract class ChannelViewActivity extends Activity {
  protected static final String TAG = "ubihelper-channelvalue";
  private BroadcastIntentSubscription subscription;
  protected String channelName;
  private Service service;
  protected double period = 1;

  /** default uses Intent EXTRA_NAME */
  protected String getChannelName() {
    return getIntent().getExtras().getString(BroadcastIntentSubscription.EXTRA_NAME);
  }
  
  @Override
  protected void onStart() {
    super.onStart();
    channelName = getChannelName();
    refresh(null);
    IntentFilter peerChangeFilter = new IntentFilter(BroadcastIntentSubscription.ACTION_CHANNEL_NEW_VALUE);
    registerReceiver(peerChangeListener, peerChangeFilter);
    Intent i = new Intent(this, Service.class);
    bindService(i, mServiceConnection, 0);
  }

  @Override
  protected void onStop() {
    super.onStop();
    unregisterReceiver(peerChangeListener);
    if (subscription!=null) {
      if (service!=null)
        service.unwatchChannel(subscription);
      subscription = null;
    }
    unbindService(mServiceConnection);
    service = null;
  }

  private BroadcastReceiver peerChangeListener = new BroadcastReceiver () {
    @Override
    public void onReceive(Context context, Intent intent) {
      if (channelName!=null && channelName.equals(intent.getExtras().getString(BroadcastIntentSubscription.EXTRA_NAME)))
        refresh(intent);
    }    
  };

  /** monitor binding to service (used for preference update push) */
  private ServiceConnection mServiceConnection = new ServiceConnection() {

    public void onServiceConnected(ComponentName name, IBinder binder) {
      service = ((Service.LocalBinder)binder).getService();
      Log.d(TAG,"Service connected");
      if (channelName!=null) {
        subscription = service.watchChannel(channelName, period );
      }
    }

    public void onServiceDisconnected(ComponentName name) {
      service = null;
      subscription = null;
      Log.d(TAG,"Service disconnected");
    }    
  };

  protected abstract void refresh(Intent intent);

}

Java Source Code List

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