How to refresh app upon shaking the device?

I need to add a shake feature that will refresh my Android application.

All I find of documentation involves implementing the SensorListener, but Eclipse tells me it's deprecated and suggest SensorEventListener.

Anybody that has a nice guide to how I go about creating this shake controller?

Here is an example code. Put this into your activity class:

  /* put this into your activity class */
  private SensorManager mSensorManager;
  private float mAccel; // acceleration apart from gravity
  private float mAccelCurrent; // current acceleration including gravity
  private float mAccelLast; // last acceleration including gravity
	
  private final SensorEventListener mSensorListener = new SensorEventListener() {

    public void onSensorChanged(SensorEvent se) {
      float x = se.values[0];
      float y = se.values[1];
      float z = se.values[2];
      mAccelLast = mAccelCurrent;
      mAccelCurrent = (float) Math.sqrt((double) (x*x + y*y + z*z));
      float delta = mAccelCurrent - mAccelLast;
      mAccel = mAccel * 0.9f + delta; // perform low-cut filter
    }

    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    }
  };

  @Override
  protected void onResume() {
    super.onResume();
    mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
  }

  @Override
  protected void onPause() {
    mSensorManager.unregisterListener(mSensorListener);
    super.onPause();
  }

And add this to your onCreate method:

    /* do this in onCreate */
    mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mSensorManager.registerListener(mSensorListener, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
    mAccel = 0.00f;
    mAccelCurrent = SensorManager.GRAVITY_EARTH;
    mAccelLast = SensorManager.GRAVITY_EARTH;

You can then ask "mAccel" wherever you want in your application for the current acceleration, independent from the axis and cleaned from static acceleration such as gravity. It will be approx. 0 if there is no movement, and, lets say >2 if the device is shaked.

Based on the comments - to test this:

if (mAccel > 12) {
    Toast toast = Toast.makeText(getApplicationContext(), "Device has shaken.", Toast.LENGTH_LONG);
	toast.show();
}

Notes:

The accelometer should be deactivated onPause and activated onResume to save resources (CPU, Battery). The code assumes we are on planet Earth ;-) and initializes the acceleration to earth gravity. Otherwise you would get a strong "shake" when the application starts and "hits" the ground from free-fall. However, the code gets used to the gravitation due to the low-cut filter and would work also on other planets or in free space, once it is initialized. (you never know how long your application will be in use...;-)

Here is my code for shake gesture detection:

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;


/**
 * Listener that detects shake gesture.
 */
public class ShakeEventListener implements SensorEventListener {


  /** Minimum movement force to consider. */
  private static final int MIN_FORCE = 10;

  /**
   * Minimum times in a shake gesture that the direction of movement needs to
   * change.
   */
  private static final int MIN_DIRECTION_CHANGE = 3;

  /** Maximum pause between movements. */
  private static final int MAX_PAUSE_BETHWEEN_DIRECTION_CHANGE = 200;

  /** Maximum allowed time for shake gesture. */
  private static final int MAX_TOTAL_DURATION_OF_SHAKE = 400;

  /** Time when the gesture started. */
  private long mFirstDirectionChangeTime = 0;

  /** Time when the last movement started. */
  private long mLastDirectionChangeTime;

  /** How many movements are considered so far. */
  private int mDirectionChangeCount = 0;

  /** The last x position. */
  private float lastX = 0;

  /** The last y position. */
  private float lastY = 0;

  /** The last z position. */
  private float lastZ = 0;

  /** OnShakeListener that is called when shake is detected. */
  private OnShakeListener mShakeListener;

  /**
   * Interface for shake gesture.
   */
  public interface OnShakeListener {

    /**
     * Called when shake gesture is detected.
     */
    void onShake();
  }

  public void setOnShakeListener(OnShakeListener listener) {
    mShakeListener = listener;
  }

  @Override
  public void onSensorChanged(SensorEvent se) {
    // get sensor data
    float x = se.values[SensorManager.DATA_X];
    float y = se.values[SensorManager.DATA_Y];
    float z = se.values[SensorManager.DATA_Z];

    // calculate movement
    float totalMovement = Math.abs(x + y + z - lastX - lastY - lastZ);

    if (totalMovement > MIN_FORCE) {

      // get time
      long now = System.currentTimeMillis();

      // store first movement time
      if (mFirstDirectionChangeTime == 0) {
        mFirstDirectionChangeTime = now;
        mLastDirectionChangeTime = now;
      }

      // check if the last movement was not long ago
      long lastChangeWasAgo = now - mLastDirectionChangeTime;
      if (lastChangeWasAgo < MAX_PAUSE_BETHWEEN_DIRECTION_CHANGE) {
        
        // store movement data
        mLastDirectionChangeTime = now;
        mDirectionChangeCount++;

        // store last sensor data 
        lastX = x;
        lastY = y;
        lastZ = z;

        // check how many movements are so far
        if (mDirectionChangeCount >= MIN_DIRECTION_CHANGE) {

          // check total duration
          long totalDuration = now - mFirstDirectionChangeTime;
          if (totalDuration < MAX_TOTAL_DURATION_OF_SHAKE) {
            mShakeListener.onShake();
            resetShakeParameters();
          }
        }

      } else {
        resetShakeParameters();
      }
    }
  }

  /**
   * Resets the shake parameters to their default values.
   */
  private void resetShakeParameters() {
    mFirstDirectionChangeTime = 0;
    mDirectionChangeCount = 0;
    mLastDirectionChangeTime = 0;
    lastX = 0;
    lastY = 0;
    lastZ = 0;
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
  }

}

Add this in your activity:

  private SensorManager mSensorManager;

  private ShakeEventListener mSensorListener;

...

in onCreate() add:

    mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mSensorListener = new ShakeEventListener();   

    mSensorListener.setOnShakeListener(new ShakeEventListener.OnShakeListener() {

      public void onShake() {
        Toast.makeText(KPBActivityImpl.this, "Shake!", Toast.LENGTH_SHORT).show();
      }
    });

and:

@Override
  protected void onResume() {
    super.onResume();
    mSensorManager.registerListener(mSensorListener,
        mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
        SensorManager.SENSOR_DELAY_UI);
  }

  @Override
  protected void onPause() {
    mSensorManager.unregisterListener(mSensorListener);
    super.onPause();
  }

Here's yet another implementation that builds on some of the tips in here as well as the code from the Android developer site.

MainActivity.java

public class MainActivity extends Activity {
	    
	private ShakeDetector mShakeDetector;
	private SensorManager mSensorManager;
	private Sensor mAccelerometer;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
    
        // ShakeDetector initialization
		mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
		mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
		mShakeDetector = new ShakeDetector(new OnShakeListener() {
			@Override
			public void onShake() {
                // Do stuff!
			}
		});
    }

	@Override
	protected void onResume() {
		super.onResume();
		mSensorManager.registerListener(mShakeDetector, mAccelerometer,	SensorManager.SENSOR_DELAY_UI);
	}
	
	@Override
	protected void onPause() {
	    mSensorManager.unregisterListener(mShakeDetector);
	    super.onPause();
	}   
}

ShakeDetector.java

package com.example.test;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;

public class ShakeDetector implements SensorEventListener {

	// Minimum acceleration needed to count as a shake movement
    private static final int MIN_SHAKE_ACCELERATION = 5;
    
    // Minimum number of movements to register a shake
    private static final int MIN_MOVEMENTS = 2;
    
    // Maximum time (in milliseconds) for the whole shake to occur
    private static final int MAX_SHAKE_DURATION = 500;
	
    // Arrays to store gravity and linear acceleration values
	private float[] mGravity = { 0.0f, 0.0f, 0.0f };
	private float[] mLinearAcceleration = { 0.0f, 0.0f, 0.0f };
	
	// Indexes for x, y, and z values
	private static final int X = 0;
	private static final int Y = 1;
	private static final int Z = 2;

	// OnShakeListener that will be notified when the shake is detected
	private OnShakeListener mShakeListener;
	
	// Start time for the shake detection
	long startTime = 0;
	
	// Counter for shake movements
	int moveCount = 0;
    
	// Constructor that sets the shake listener
    public ShakeDetector(OnShakeListener shakeListener) {
    	mShakeListener = shakeListener;
    }

    @Override
    public void onSensorChanged(SensorEvent event) {
    	// This method will be called when the accelerometer detects a change.
    	
    	// Call a helper method that wraps code from the Android developer site
    	setCurrentAcceleration(event);
         
        // Get the max linear acceleration in any direction
        float maxLinearAcceleration = getMaxCurrentLinearAcceleration();
        
        // Check if the acceleration is greater than our minimum threshold
        if (maxLinearAcceleration > MIN_SHAKE_ACCELERATION) {
        	long now = System.currentTimeMillis();
        	
        	// Set the startTime if it was reset to zero
        	if (startTime == 0) {
        		startTime = now;
        	}
        	
        	long elapsedTime = now - startTime;
        	
        	// Check if we're still in the shake window we defined
        	if (elapsedTime > MAX_SHAKE_DURATION) {
        		// Too much time has passed. Start over!
        		resetShakeDetection();
        	}
        	else {
        		// Keep track of all the movements
        		moveCount++;
        		
        		// Check if enough movements have been made to qualify as a shake
        		if (moveCount > MIN_MOVEMENTS) {
        			// It's a shake! Notify the listener.
        			mShakeListener.onShake();
        			
        			// Reset for the next one!
        			resetShakeDetection();
        		}
        	}
        }
    }

    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
  	    // Intentionally blank
    }
    
    private void setCurrentAcceleration(SensorEvent event) {
       	/*
    	 *  BEGIN SECTION from Android developer site. This code accounts for 
    	 *  gravity using a high-pass filter
    	 */
    	
    	// alpha is calculated as t / (t + dT)
        // with t, the low-pass filter's time-constant
        // and dT, the event delivery rate

        final float alpha = 0.8f;

        // Gravity components of x, y, and z acceleration
        mGravity[X] = alpha * mGravity[X] + (1 - alpha) * event.values[X];
        mGravity[Y] = alpha * mGravity[Y] + (1 - alpha) * event.values[Y];
        mGravity[Z] = alpha * mGravity[Z] + (1 - alpha) * event.values[Z];

        // Linear acceleration along the x, y, and z axes (gravity effects removed)
        mLinearAcceleration[X] = event.values[X] - mGravity[X];
        mLinearAcceleration[Y] = event.values[Y] - mGravity[Y];
        mLinearAcceleration[Z] = event.values[Z] - mGravity[Z];
        
        /*
         *  END SECTION from Android developer site
         */
    }
    
    private float getMaxCurrentLinearAcceleration() {
    	// Start by setting the value to the x value
    	float maxLinearAcceleration = mLinearAcceleration[X];
    	
    	// Check if the y value is greater
        if (mLinearAcceleration[Y] > maxLinearAcceleration) {
        	maxLinearAcceleration = mLinearAcceleration[Y];
        }
        
        // Check if the z value is greater
        if (mLinearAcceleration[Z] > maxLinearAcceleration) {
        	maxLinearAcceleration = mLinearAcceleration[Z];
        }
        
        // Return the greatest value
        return maxLinearAcceleration;
    }
    
    private void resetShakeDetection() {
    	startTime = 0;
    	moveCount = 0;
    }
    
    // (I'd normally put this definition in it's own .java file)
    public interface OnShakeListener {
    	public void onShake();
    }
}

I really liked Peterdk's answer. I took it upon myself to make a coulpe of tweaks to his code .

file: ShakeDetector.java

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.FloatMath;

public class ShakeDetector implements SensorEventListener {

	// The gForce that is necessary to register as shake. Must be greater than 1G (one earth gravity unit)
	private static final float SHAKE_THRESHOLD_GRAVITY = 2.7F;
	private static final int SHAKE_SLOP_TIME_MS = 500;
	private static final int SHAKE_COUNT_RESET_TIME_MS = 3000;
	
	private OnShakeListener mListener;
	private long mShakeTimestamp;
	private int mShakeCount;

	public void setOnShakeListener(OnShakeListener listener) {
		this.mListener = listener;
	}

	public interface OnShakeListener {
		public void onShake(int count);
	}

	@Override
	public void onAccuracyChanged(Sensor sensor, int accuracy) {
		// ignore
	}

	@Override
	public void onSensorChanged(SensorEvent event) {

		if (mListener != null) {
			float x = event.values[0];
			float y = event.values[1];
			float z = event.values[2];

			float gX = x / SensorManager.GRAVITY_EARTH;
			float gY = y / SensorManager.GRAVITY_EARTH;
			float gZ = z / SensorManager.GRAVITY_EARTH;

			// gForce will be close to 1 when there is no movement.
			float gForce = FloatMath.sqrt(gX * gX + gY * gY + gZ * gZ);

			if (gForce > SHAKE_THRESHOLD_GRAVITY) {
				final long now = System.currentTimeMillis();
				// ignore shake events too close to each other (500ms)
				if (mShakeTimestamp + SHAKE_SLOP_TIME_MS > now ) {
					return;
				}
				
				// reset the shake count after 3 seconds of no shakes
				if (mShakeTimestamp + SHAKE_COUNT_RESET_TIME_MS < now ) {
					mShakeCount = 0;
				}
				
				mShakeTimestamp = now;
				mShakeCount++;
				
				mListener.onShake(mShakeCount);
			}
		}
	}
}

Also, don't forget that you need to register an instance of the ShakeDetector with the SensorManager.

// ShakeDetector initialization
mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
mShakeDetector = new ShakeDetector();
mShakeDetector.setOnShakeListener(new OnShakeListener() {

    @Override
	public void onShake(int count) {
			handleShakeEvent(count); 
		}
	});

mSensorManager.registerListener(mShakeDetector, mAccelerometer, SensorManager.SENSOR_DELAY_UI);

I am developing a motion-detection and shake-detection app for my university project.

Besides the original target of the application, I am splitting the library part (responsible for motion and shake detection) from the app. The code is free, available on SourceForge with the project name "BenderCatch". Documentation I am producing will be ready around mid-september. http://sf.net/projects/bendercatch

It uses a more precise way to detect shake: watches BOTH the difference of force between SensorEvents AND the oscillations present in X and Y axis when you perform a shake. It can even make a sound (or vibrate) on each oscillation of the shake.

Feel free to ask me more by e-mail at raffaele [at] terzigno [dot] com

I have written a small example for detecting vertical and horizontal shakes and showing a Toast.

public class Accelerometerka2Activity extends Activity implements SensorEventListener {	
    private float mLastX, mLastY, mLastZ;
    private boolean mInitialized;
    private SensorManager mSensorManager;
    private Sensor mAccelerometer;
    private final float NOISE = (float) 8.0;
 
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);
        mInitialized = false;
        mSensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
        mAccelerometer = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        mSensorManager.registerListener(this, mAccelerometer , SensorManager.SENSOR_DELAY_NORMAL);
    }

    protected void onResume() {
        super.onResume();
        mSensorManager.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_NORMAL);
    }

    protected void onPause() {
        super.onPause();
        mSensorManager.unregisterListener(this);
    }


    public void onAccuracyChanged(Sensor sensor, int accuracy) {
    	// can be safely ignored for this demo
    }


    public void onSensorChanged(SensorEvent event) {
    	float x = event.values[0];
    	float y = event.values[1];
    	float z = event.values[2];
    	if (!mInitialized) {
    		mLastX = x;
    		mLastY = y;
    		mLastZ = z;
    		mInitialized = true;
    	} else {
    		float deltaX = Math.abs(mLastX - x);
    		float deltaY = Math.abs(mLastY - y);
    		float deltaZ = Math.abs(mLastZ - z);
    		if (deltaX < NOISE) deltaX = (float)0.0;
    		if (deltaY < NOISE) deltaY = (float)0.0;
    		if (deltaZ < NOISE) deltaZ = (float)0.0;
    		mLastX = x;
    		mLastY = y;
    		mLastZ = z;
    		if (deltaX > deltaY) {
    			Toast.makeText(getBaseContext(), "Horizental", Toast.LENGTH_SHORT).show();
    		} else if (deltaY > deltaX) {
    			Toast.makeText(getBaseContext(), "Vertical", Toast.LENGTH_SHORT).show();
    		}
    	}
    }
}

You can use seismic. An example can be found here.

I have tried several implementations, but would like to share my own. It uses G-force as unit for the threshold calculation. It makes it a bit easier to understand what is going on, and also with setting a good threshold.

It simply registers a increase in G force and triggers the listener if it exceeds the threshold. It doesn't use any direction thresholds, cause you don't really need that if you just want to register a good shake.

Of-course you need the standard registering and UN-registering of this listener in the Activity.

Also, to check what threshold you need, I recommend the following app (I am not in any way connected to that app)

    public class UmitoShakeEventListener implements SensorEventListener {

	/**
	 * The gforce that is necessary to register as shake. (Must include 1G
	 * gravity)
	 */
	private final float shakeThresholdInGForce = 2.25F;

	private final float gravityEarth = SensorManager.GRAVITY_EARTH;

	private OnShakeListener listener;

	public void setOnShakeListener(OnShakeListener listener) {
		this.listener = listener;
	}

	public interface OnShakeListener {
		public void onShake();
	}

	@Override
	public void onAccuracyChanged(Sensor sensor, int accuracy) {
		// ignore

	}

	@Override
	public void onSensorChanged(SensorEvent event) {

		if (listener != null) {
			float x = event.values[0];
			float y = event.values[1];
			float z = event.values[2];

			float gX = x / gravityEarth;
			float gY = y / gravityEarth;
			float gZ = z / gravityEarth;

            //G-Force will be 1 when there is no movement. (gravity)
			float gForce = FloatMath.sqrt(gX * gX + gY * gY + gZ * gZ); 
                    


			if (gForce > shakeThresholdInGForce) {
				listener.onShake();

			}
		}

	}

}

Here is another code for this:

import java.util.List;
import java.util.Timer;
import java.util.TimerTask;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Handler;
    
   public class AccelerometerListener implements SensorEventListener {
    
        private SensorManager sensorManager;
        private List<Sensor> sensors;
        private Sensor sensor;
        private long lastUpdate = -1;
        private long currentTime = -1;
        private Main parent;
        private Timer timer;
        private int shakes;
        private static final Handler mHandler = new Handler();
    
        private float last_x, last_y, last_z;
        private float current_x, current_y, current_z, currenForce;
        private static final int FORCE_THRESHOLD = 500;
        private final int DATA_X = SensorManager.DATA_X;
        private final int DATA_Y = SensorManager.DATA_Y;
        private final int DATA_Z = SensorManager.DATA_Z;
    
        public AccelerometerListener(Main parent) {
            SensorManager sensorService = (SensorManager) parent
                    .getSystemService(Context.SENSOR_SERVICE);
    
            this.sensorManager = sensorService;
            if (sensorService == null)
                return;
    
            this.sensors = sensorManager.getSensorList(Sensor.TYPE_ACCELEROMETER);
            if (sensors.size() > 0) {
                sensor = sensors.get(0);
            }
    
            this.parent = parent;
        }
    
        public void start() {
            if (sensor == null)
                return;
    
            sensorManager.registerListener(this, sensor,
                    SensorManager.SENSOR_DELAY_GAME);
        }
    
        public void stop() {
            if (sensorManager == null)
                return;
    
            sensorManager.unregisterListener(this);
        }
    
        public void onAccuracyChanged(Sensor s, int valu) {
    
        }
    
        public void onSensorChanged(SensorEvent event) {
    
            if (event.sensor.getType() != Sensor.TYPE_ACCELEROMETER)
                return;
    
            currentTime = System.currentTimeMillis();
    
            if ((currentTime - lastUpdate) > 50) {
                long diffTime = (currentTime - lastUpdate);
                lastUpdate = currentTime;
    
                current_x = event.values[DATA_X];
                current_y = event.values[DATA_Y];
                current_z = event.values[DATA_Z];
    
                currenForce = Math.abs(current_x + current_y + current_z - last_x
                        - last_y - last_z)
                        / diffTime * 10000;
    
                if (currenForce > FORCE_THRESHOLD) {
                    shakeDetected();
                }
                last_x = current_x;
                last_y = current_y;
                last_z = current_z;
    
            }
        }
    
        private void shakeDetected() {
            shakes++;
    
            if (shakes == 1) {
                if (timer != null) {
                    timer.cancel();
                }
    
                timer = new Timer();
                timer.schedule(new TimerTask() {
    
                    @Override
                    public void run() {
                        if (shakes > 3) {
                            mHandler.post(new Runnable() {
    
                                public void run() {
                                    // shake
                                }
                            });
                        }
    
                        shakes = 0;
                    }
                }, 500);
            }
        }
    }

 package com.example.shakingapp;

import android.app.Activity;
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;
import android.view.Window;
import android.view.WindowManager;
import android.widget.Toast;


public class MainActivity extends Activity implements SensorEventListener {
  private SensorManager sensorManager;
  private boolean color = false;
  private View view;
  private long lastUpdate;

  
/** Called when the activity is first created. */

  @Override
  public void onCreate(Bundle savedInstanceState) {
    requestWindowFeature(Window.FEATURE_NO_TITLE);
    getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
        WindowManager.LayoutParams.FLAG_FULLSCREEN);

    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
    view = findViewById(R.id.textView);
    view.setBackgroundColor(Color.GREEN);

    sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    lastUpdate = System.currentTimeMillis();
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
      getAccelerometer(event);
    }

  }

  private void getAccelerometer(SensorEvent event) {
    float[] values = event.values;
    // Movement
    float x = values[0];
    float y = values[1];
    float z = values[2];

    System.out.println(x);
    System.out.println(y);
    System.out.println(z);
    System.out.println(SensorManager.GRAVITY_EARTH );
    
    float accelationSquareRoot = (x * x + y * y + z * z)
        / (SensorManager.GRAVITY_EARTH * SensorManager.GRAVITY_EARTH);
    
    long actualTime = System.currentTimeMillis();
    if (accelationSquareRoot >= 2) //
    {
      if (actualTime - lastUpdate < 200) {
        return;
      }
      lastUpdate = actualTime;
      Toast.makeText(this, "Device was shuffed "+accelationSquareRoot, Toast.LENGTH_SHORT)
          .show();
      if (color) {
        view.setBackgroundColor(Color.GREEN);

      } else {
        view.setBackgroundColor(Color.RED);
      }
      color = !color;
    }
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {

  }

  @Override
  protected void onResume() {
    super.onResume();
    // register this class as a listener for the orientation and
    // accelerometer sensors
    sensorManager.registerListener(this,
        sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
        SensorManager.SENSOR_DELAY_NORMAL);
  }

  @Override
  protected void onPause() {
    // unregister listener
    super.onPause();
    sensorManager.unregisterListener(this);
  }
} 

package anywheresoftware.b4a.student;

import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.FloatMath;
 
public class ShakeEventListener implements SensorEventListener {
 
    /*
     * The gForce that is necessary to register as shake.
     * Must be greater than 1G (one earth gravity unit).
     * You can install "G-Force", by Blake La Pierre
     * from the Google Play Store and run it to see how
     *  many G's it takes to register a shake
     */
    private static final float SHAKE_THRESHOLD_GRAVITY = 2.7F;
    private static int SHAKE_SLOP_TIME_MS = 500;
    private static final int SHAKE_COUNT_RESET_TIME_MS = 1000;
 
    private OnShakeListener mListener;
    private long mShakeTimestamp;
    private int mShakeCount;
 
    public void setOnShakeListener(OnShakeListener listener) {
        this.mListener = listener;
    }
 
    public interface OnShakeListener {
        public void onShake(int count);
    }
 
    @Override
    public void onAccuracyChanged(Sensor sensor, int accuracy) {
        // ignore
    }
 
    @Override
    public void onSensorChanged(SensorEvent event) {
 
        if (mListener != null) {
            float x = event.values[0];
            float y = event.values[1];
            float z = event.values[2];
 
            float gX = x / SensorManager.GRAVITY_EARTH;
            float gY = y / SensorManager.GRAVITY_EARTH;
            float gZ = z / SensorManager.GRAVITY_EARTH;
 
            // gForce will be close to 1 when there is no movement.
            float gForce = FloatMath.sqrt(gX * gX + gY * gY + gZ * gZ);
 
            if (gForce > SHAKE_THRESHOLD_GRAVITY) {
                final long now = System.currentTimeMillis();
                // ignore shake events too close to each other (500ms)
                if (mShakeTimestamp + getSHAKE_SLOP_TIME_MS() > now) {
                    return;
                }
 
                // reset the shake count after 3 seconds of no shakes
                if (mShakeTimestamp + SHAKE_COUNT_RESET_TIME_MS < now) {
                    mShakeCount = 0;
                }
 
                mShakeTimestamp = now;
                mShakeCount++;
 
                mListener.onShake(mShakeCount);
            }
        }
    }

	private long getSHAKE_SLOP_TIME_MS() {
		// TODO Auto-generated method stub
		return SHAKE_SLOP_TIME_MS;
	}

	public void setSHAKE_SLOP_TIME_MS(int sHAKE_SLOP_TIME_MS) {
		SHAKE_SLOP_TIME_MS = sHAKE_SLOP_TIME_MS;
	}	
	
}

You should subscribe as a SensorEventListener, and get the accelerometer data. Once you have it, you should monitor for sudden change in direction (sign) of acceleration on a certain axis. It would be a good indication for the 'shake' movement of device.

Shaker.java

    import java.util.ArrayList;
    import android.content.Context;
    import android.hardware.Sensor;
    import android.hardware.SensorEvent;
    import android.hardware.SensorEventListener;
    import android.hardware.SensorManager;
    
    public class Shaker implements SensorEventListener{
    
    	private static final String SENSOR_SERVICE = Context.SENSOR_SERVICE;
    	private SensorManager sensorMgr;
    	private Sensor mAccelerometer;
    	private boolean accelSupported;
    	private long timeInMillis;
    	private long threshold;
    	private OnShakerTreshold listener;
    	ArrayList<Float> valueStack;
    	
    	public Shaker(Context context, OnShakerTreshold listener, long timeInMillis, long threshold) {
    		try {
    			this.timeInMillis = timeInMillis;
    			this.threshold = threshold;
    			this.listener = listener;
    			if (timeInMillis<100){
    				throw new Exception("timeInMillis < 100ms");
    			}
    			valueStack = new ArrayList<Float>((int)(timeInMillis/100));
    			sensorMgr = (SensorManager) context.getSystemService(SENSOR_SERVICE);
    			mAccelerometer = sensorMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
    			
    		} catch (Exception e){
    			e.printStackTrace();
    		}
    	}
    	
    	public void start() {
    		try {
    			accelSupported = sensorMgr.registerListener(this, mAccelerometer, SensorManager.SENSOR_DELAY_GAME); 
    			if (!accelSupported) {
    			    stop();
    			    throw new Exception("Sensor is not supported");
    			}
    		} catch (Exception e){
    			e.printStackTrace();
    		}
    	}
    	
    	public void stop(){
    		try {
    			sensorMgr.unregisterListener(this, mAccelerometer);
    		} catch (Exception e){
    			e.printStackTrace();
    		}
    	}
    	
    	@Override
    	protected void finalize() throws Throwable {
    		try {
    			stop();
    		} catch (Exception e){
    			e.printStackTrace();
    		}
    		super.finalize();
    	}
    	
    	long lastUpdate = 0;
    	private float last_x;
    	private float last_y;
    	private float last_z;
    	
public void onSensorChanged(SensorEvent event) {
	try {
		if (event.sensor == mAccelerometer) {
			long curTime = System.currentTimeMillis();
			if ((curTime-lastUpdate)>getNumberOfMeasures()){

				lastUpdate = System.currentTimeMillis();
				float[] values = event.values;
				if (valueStack.size()>(int)getNumberOfMeasures())
					valueStack.remove(0);
				float x = (int)(values[SensorManager.DATA_X]);
				float y = (int)(values[SensorManager.DATA_Y]);
				float z = (int)(values[SensorManager.DATA_Z]);
				float speed = Math.abs((x+y+z) - (last_x + last_y + last_z));
				
				valueStack.add(speed);
				
				String posText = String.format("X:%4.0f Y:%4.0f Z:%4.0f", (x-last_x), (y-last_y), (z-last_z));
				
				last_x = (x);
				last_y = (y);
				last_z = (z);
				
				float sumOfValues = 0;
				float avgOfValues = 0;

				for (float f : valueStack){
						sumOfValues = (sumOfValues+f);
				}
				avgOfValues = sumOfValues/(int)getNumberOfMeasures();
				
				if (avgOfValues>=threshold){
					listener.onTreshold();
					valueStack.clear();
				}
				
				System.out.println(String.format("M: %+4d A: %5.0f V: %4.0f %s", valueStack.size(),avgOfValues,speed,posText));
				
			}
		}
	} catch (Exception e){
		e.printStackTrace();
	}
}

    
    	private long getNumberOfMeasures() {
    		return timeInMillis/100;
    	}
    
    	public void onAccuracyChanged(Sensor sensor, int accuracy) {}
    	
    	public interface OnShakerTreshold {
    		public void onTreshold();
    	}
    }

MainActivity.java

public class MainActivity extends Activity implements OnShakerTreshold{


	private Shaker s;

	@Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
	    s = new Shaker(getApplicationContext(), this, 5000, 20);
        // 5000 = 5 second of shaking
        // 20 = minimal threshold (very angry shaking :D)
        // beware screen rotation reset counter
    }

	@Override
	protected void onResume() {
		s.start();
		super.onResume();
	}
	
	@Override
	protected void onPause() {
		s.stop();
		super.onPause();
	}
	
	public void onTreshold() {
		System.out.println("FIRE LISTENER");
		RingtoneManager.getRingtone(getApplicationContext(), RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)).play();
	}

    
}

Have fun.

// Need to implement SensorListener
public class ShakeActivity extends Activity implements SensorListener {
// For shake motion detection.
private SensorManager sensorMgr;
private long lastUpdate = -1;
private float x, y, z;
private float last_x, last_y, last_z;
private static final int SHAKE_THRESHOLD = 800;

protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
// start motion detection
sensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE);
boolean accelSupported = sensorMgr.registerListener(this,
	SensorManager.SENSOR_ACCELEROMETER,
	SensorManager.SENSOR_DELAY_GAME);

if (!accelSupported) {
    // on accelerometer on this device
    sensorMgr.unregisterListener(this,
            SensorManager.SENSOR_ACCELEROMETER);
}
}

protected void onPause() {
if (sensorMgr != null) {
    sensorMgr.unregisterListener(this,
            SensorManager.SENSOR_ACCELEROMETER);
    sensorMgr = null;
    }
super.onPause();
}

public void onAccuracyChanged(int arg0, int arg1) {
// TODO Auto-generated method stub
}

public void onSensorChanged(int sensor, float[] values) {
if (sensor == SensorManager.SENSOR_ACCELEROMETER) {
    long curTime = System.currentTimeMillis();
    // only allow one update every 100ms.
    if ((curTime - lastUpdate)> 100) {
	long diffTime = (curTime - lastUpdate);
	lastUpdate = curTime;

	x = values[SensorManager.DATA_X];
	y = values[SensorManager.DATA_Y];
	z = values[SensorManager.DATA_Z];

	float speed = Math.abs(x+y+z - last_x - last_y - last_z)
                          / diffTime * 10000;
	if (speed > SHAKE_THRESHOLD) {
	    // yes, this is a shake action! Do something about it!
	}
	last_x = x;
	last_y = y;
	last_z = z;
    }
}
}
}

Working with me v.good Reference

public class ShakeEventListener implements SensorEventListener {
public final static int SHAKE_LIMIT = 15;
public final static int LITTLE_SHAKE_LIMIT = 5;

private SensorManager mSensorManager;
private float mAccel = 0.00f;
private float mAccelCurrent = SensorManager.GRAVITY_EARTH;
private float mAccelLast = SensorManager.GRAVITY_EARTH;

private ShakeListener listener;

public interface ShakeListener {
    public void onShake();
    public void onLittleShake();
}

public ShakeEventListener(ShakeListener l) {
    Activity a = (Activity) l;
    mSensorManager = (SensorManager) a.getSystemService(Context.SENSOR_SERVICE);
    listener = l;
    registerListener();
}

public ShakeEventListener(Activity a, ShakeListener l) {
    mSensorManager = (SensorManager) a.getSystemService(Context.SENSOR_SERVICE);
    listener = l;
    registerListener();
}

public void registerListener() {
    mSensorManager.registerListener(this, mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
}

public void unregisterListener() {
    mSensorManager.unregisterListener(this);
}

public void onSensorChanged(SensorEvent se) {
    float x = se.values[0];
    float y = se.values[1];
    float z = se.values[2];
    mAccelLast = mAccelCurrent;
    mAccelCurrent = (float) FloatMath.sqrt(x*x + y*y + z*z);
    float delta = mAccelCurrent - mAccelLast;
    mAccel = mAccel * 0.9f + delta;
    if(mAccel > SHAKE_LIMIT)
        listener.onShake();
    else if(mAccel > LITTLE_SHAKE_LIMIT)
        listener.onLittleShake();
}

public void onAccuracyChanged(Sensor sensor, int accuracy) {}
}

You might want to try open source tinybus. With it shake detection is as easy as this.

public class MainActivity extends Activity {

	private Bus mBus;
	
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
        ...

		// Create a bus and attach it to activity
		mBus = TinyBus.from(this).wire(new ShakeEventWire());
	}

	@Subscribe
	public void onShakeEvent(ShakeEvent event) {
		Toast.makeText(this, "Device has been shaken", 
                Toast.LENGTH_SHORT).show();
	}

	@Override
	protected void onStart() {
		super.onStart();
		mBus.register(this);
	}
	
	@Override
	protected void onStop() {
		mBus.unregister(this);
		super.onStop();
	}
}

It uses seismic for shake detection.

I modify @peceps's answer and make kotlin version of it. And I also add LifecycleOwner parameter to make it lifecycle-aware.

import android.hardware.Sensor
import android.hardware.SensorEvent
import android.hardware.SensorEventListener
import android.hardware.SensorManager
import androidx.lifecycle.DefaultLifecycleObserver
import androidx.lifecycle.LifecycleOwner
import kotlin.math.abs


/**
 * Listener that detects shake gesture.
 */
class ShakeEventListener(
    lifecycleOwner: LifecycleOwner,
    private val sensorManager: SensorManager,
    private val onShake: () -> Unit = {}
) : SensorEventListener, DefaultLifecycleObserver {
    /** Time when the gesture started.  */
    private var mFirstDirectionChangeTime: Long = 0

    /** Time when the last movement started.  */
    private var mLastDirectionChangeTime: Long = 0

    /** How many movements are considered so far.  */
    private var mDirectionChangeCount = 0

    /** The last x position.  */
    private var lastX = 0f

    /** The last y position.  */
    private var lastY = 0f

    /** The last z position.  */
    private var lastZ = 0f

    init {
        sensorManager.registerListener(
            this,
            sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
            SensorManager.SENSOR_DELAY_UI
        )
        // observe lifecycle state
        lifecycleOwner.lifecycle.addObserver(this)
    }


    override fun onResume(owner: LifecycleOwner) {
        sensorManager.registerListener(
            this,
            sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
            SensorManager.SENSOR_DELAY_UI
        )
    }


    override fun onPause(owner: LifecycleOwner) {
        sensorManager.unregisterListener(this)
    }

    override fun onSensorChanged(se: SensorEvent) {
        // get sensor data
        val x = se.values[0]
        val y = se.values[1]
        val z = se.values[2]

        // calculate movement
        val totalMovement = abs(x + y + z - lastX - lastY - lastZ)
        if (totalMovement > MIN_FORCE) {

            // get time
            val now = System.currentTimeMillis()

            // store first movement time
            if (mFirstDirectionChangeTime == 0L) {
                mFirstDirectionChangeTime = now
                mLastDirectionChangeTime = now
            }

            // check if the last movement was not long ago
            val lastChangeWasAgo = now - mLastDirectionChangeTime
            if (lastChangeWasAgo < MAX_PAUSE_BETWEEN_DIRECTION_CHANGE) {

                // store movement data
                mLastDirectionChangeTime = now
                mDirectionChangeCount++

                // store last sensor data
                lastX = x
                lastY = y
                lastZ = z

                // check how many movements are so far
                if (mDirectionChangeCount >= MIN_DIRECTION_CHANGE) {

                    // check total duration
                    val totalDuration = now - mFirstDirectionChangeTime
                    if (totalDuration < MAX_TOTAL_DURATION_OF_SHAKE) {
                        onShake()
                        resetShakeParameters()
                    }
                }
            } else {
                resetShakeParameters()
            }
        }
    }

    /**
     * Resets the shake parameters to their default values.
     */
    private fun resetShakeParameters() {
        mFirstDirectionChangeTime = 0
        mDirectionChangeCount = 0
        mLastDirectionChangeTime = 0
        lastX = 0f
        lastY = 0f
        lastZ = 0f
    }

    override fun onAccuracyChanged(sensor: Sensor, accuracy: Int) {}

    companion object {
        /** Minimum movement force to consider.  */
        private const val MIN_FORCE = 10

        /**
         * Minimum times in a shake gesture that the direction of movement needs to
         * change.
         */
        private const val MIN_DIRECTION_CHANGE = 3

        /** Maximum pause between movements.  */
        private const val MAX_PAUSE_BETWEEN_DIRECTION_CHANGE = 200

        /** Maximum allowed time for shake gesture.  */
        private const val MAX_TOTAL_DURATION_OF_SHAKE = 400
    }
}

In your activity, add this code to make it detecting shake event:

ShakeEventListener(this, sensorManager){
    // onShake logic
}