Android Open Source - interdroid-swan Screen Sensor

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License

The source code is released under:

Copyright (c) 2008-2011 Vrije Universiteit, The Netherlands All rights reserved. Redistribution and use in source and binary forms, with or without modification, are permitted provided that the follo...

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Java Source Code

package interdroid.swan.sensors.impl;
//from  ww w. j  a v a  2 s  . c  om
import interdroid.swan.R;
import interdroid.swan.sensors.AbstractConfigurationActivity;
import interdroid.swan.sensors.AbstractVdbSensor;
import interdroid.vdb.content.avro.AvroContentProviderProxy;
import android.content.BroadcastReceiver;
import android.content.ContentValues;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.os.Bundle;
import android.os.PowerManager;

/**
 * A sensor for if the screen is on or off.
 * 
 * @author nick &lt;palmer@cs.vu.nl&gt;
 * 
 */
public class ScreenSensor extends AbstractVdbSensor {

  /**
   * The configuration activity for this sensor.
   * 
   * @author nick &lt;palmer@cs.vu.nl&gt;
   * 
   */
  public static class ConfigurationActivity extends
      AbstractConfigurationActivity {

    @Override
    public final int getPreferencesXML() {
      return R.xml.screen_preferences;
    }

  }

  /**
   * Is screen on field.
   */
  public static final String IS_SCREEN_ON_FIELD = "is_screen_on";

  /**
   * The schema for this sensor.
   */
  public static final String SCHEME = getSchema();

  /**
   * The provider for this sensor.
   * 
   * @author nick &lt;palmer@cs.vu.nl&gt;
   * 
   */
  public static class Provider extends AvroContentProviderProxy {

    /**
     * Construct the provider for this sensor.
     */
    public Provider() {
      super(SCHEME);
    }

  }

  /**
   * @return the schema for this sensor.
   */
  private static String getSchema() {
    String scheme = "{'type': 'record', 'name': 'screen', "
        + "'namespace': 'interdroid.context.sensor.screen',"
        + "\n'fields': [" + SCHEMA_TIMESTAMP_FIELDS + "\n{'name': '"
        + IS_SCREEN_ON_FIELD + "', 'type': 'string'}" + "\n]" + "}";
    return scheme.replace('\'', '"');
  }

  /**
   * The receiver of screen information.
   */
  private BroadcastReceiver screenReceiver = new BroadcastReceiver() {

    @Override
    public void onReceive(final Context context, final Intent intent) {
      long now = System.currentTimeMillis();
      ContentValues values = new ContentValues();

      if (intent.getAction().equals(Intent.ACTION_SCREEN_OFF)) {
        values.put(IS_SCREEN_ON_FIELD, "false");
      } else if (intent.getAction().equals(Intent.ACTION_SCREEN_ON)) {
        values.put(IS_SCREEN_ON_FIELD, "true");
      }
      putValues(values, now);
    }

  };

  @Override
  public final String[] getValuePaths() {
    return new String[] { IS_SCREEN_ON_FIELD };
  }

  @Override
  public void initDefaultConfiguration(final Bundle defaults) {
  }

  @Override
  public final String getScheme() {
    return SCHEME;
  }

  @Override
  public final void onConnected() {
  }

  @Override
  public final void register(final String id, final String valuePath,
      final Bundle configuration) {
    if (registeredConfigurations.size() == 1) {
      PowerManager pm = (PowerManager) getSystemService(POWER_SERVICE);
      ContentValues values = new ContentValues();
      values.put(IS_SCREEN_ON_FIELD, "" + pm.isScreenOn());
      putValues(values, System.currentTimeMillis());

      IntentFilter filter = new IntentFilter(Intent.ACTION_SCREEN_ON);
      filter.addAction(Intent.ACTION_SCREEN_OFF);
      registerReceiver(screenReceiver, filter);
    }
  }

  @Override
  public final void unregister(final String id) {
    if (registeredConfigurations.size() == 0) {
      unregisterReceiver(screenReceiver);
    }
  }

  @Override
  public final void onDestroySensor() {
    unregisterReceiver(screenReceiver);
  }

}

Java Source Code List