Android Open Source - Android-Sessions Light Clock Activity

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License

The source code is released under:
MIT License
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Java Source Code

package uk.ac.icappsoc.appsocthree.light;
/*ww  w. j  a  v a  2s.co  m*/
import uk.ac.icappsoc.appsocthree.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.graphics.Typeface;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.text.format.Time;
import android.widget.TextView;

public class LightClockActivity extends Activity implements SensorEventListener {

  /**
   *  A reference to the system SensorManager, which we use to access all the sensors we'll want.
   *  In our case, we'll use it to start and stop listening for sensor events, as well as retrieve
   *  references to the sensors we will use.
   */
  private SensorManager sensorManager;
  
  private Time time;
  private TextView clockTextView;
  private TextView luxTextView;
  
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_light_clock);
    
    // Retrieve the SensorManager and get a reference to the sensor we want.
    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    
    time = new Time();
    // Grab our clock TextView so we can display the current time in a slick 7-segment font!
    clockTextView = (TextView) findViewById(R.id.clock);
    Typeface lcdTypeface = Typeface.createFromAsset(getAssets(), "fonts/digital-7 (mono).ttf");
    clockTextView.setTypeface(lcdTypeface);
    // Grab our TextView so we can display the current light value (in lux) as well.
    luxTextView = (TextView) findViewById(R.id.text);
    luxTextView.setTypeface(lcdTypeface);
  }
  
  private Runnable updateClockTime = new Runnable(){
    @Override
    public void run() {
      time.setToNow();
      clockTextView.setText(time.format("%k:%M:%S"));
      clockTextView.postDelayed(this, 1000);
    }
  };
  
  // Note that onResume() is called every time an Activity comes to the foreground, including the first time it starts up.
  @Override
  protected void onResume(){
    super.onResume();
    // Register this Activity as the listener for our proximity sensor as soon as we resume running.
    sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_LIGHT), SensorManager.SENSOR_DELAY_NORMAL);
    // Start updating our time
    clockTextView.post(updateClockTime);
  }
  
  @Override
  protected void onPause(){
    super.onPause();
    // Unregister this Activity as soon as it's paused to prevent battery drain.
    sensorManager.unregisterListener(this);
    clockTextView.removeCallbacks(updateClockTime);
  }
  
  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // Typically we're not too interested in doing anything here.
  }

  private static final float DAYLIGHT_THRESHOLD = 20; // lux
  
  @Override
  public void onSensorChanged(SensorEvent event) {
    // Here's where the meat lies!
    if(event.sensor.getType() == Sensor.TYPE_LIGHT){
      float lightLux = event.values[0];
      luxTextView.setText(lightLux + " lux");
      
      if(lightLux > DAYLIGHT_THRESHOLD){
        luxTextView.setTextColor(Color.BLACK);
        clockTextView.setTextColor(Color.BLACK);
        getWindow().getDecorView().setBackgroundColor(Color.WHITE);
      } else {
        luxTextView.setTextColor(Color.WHITE);
        clockTextView.setTextColor(Color.WHITE);
        getWindow().getDecorView().setBackgroundColor(Color.BLACK);
      }
    }
    
  }

}
Java Source Code List
