Android Open Source - Android-Sessions Shake 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.accel;
//from ww w. j av a 2s. com
import java.util.Random;

import uk.ac.icappsoc.appsocthree.R;
import android.app.Activity;
import android.content.Context;
import android.graphics.Color;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.view.View;

public class ShakeActivity 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;
  
  /** A reference to the background so we can change its color when we detect a shake! */
  private View background;

  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_shake);
    
    // Retrieve the SensorManager and get a reference to the sensor we want.
    sensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    
    background = findViewById(R.id.container);
  }

  // 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 acceleration sensor as soon as we resume running.
    sensorManager.registerListener(this, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_UI);
  }

  @Override
  protected void onPause(){
    super.onPause();
    // Unregister this Activity as soon as it's paused to prevent battery drain.
    sensorManager.unregisterListener(this);
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    // Typically we're not too interested in doing anything here.
  }
  
  private static final double ACCELERATION_THRESHOLD = 20; // m/s
  
  
  @Override
  public void onSensorChanged(SensorEvent event) {
    // Here's where the meat lies!
    if(event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
      // Let's calculate the magnitude of acceleration.
      float accelerationX = event.values[0];
      float accelerationY = event.values[1];
      float accelerationZ = event.values[2];
      
      double magnitude = Math.sqrt(accelerationX * accelerationX + accelerationY * accelerationY + accelerationZ * accelerationZ);
      if(magnitude > ACCELERATION_THRESHOLD){
        // A friend of our old RainbowTextView
        Random random = new Random();
        background.setBackgroundColor(Color.argb(255, random.nextInt(255), random.nextInt(255), random.nextInt(255)));
      }
    }
  }
}

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