Android: Chci se třepe

Měli byste se přihlásit jako SensorEventListener, a získat accelerometerdata. jakmile ho máte, měli byste sledovat náhlé změně směru (znamení) zrychlení na určité ose. bylo by to dobré znamení pro 'shake'pohyb.

Tady je můj kód pro detekci chvění gesto:

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) {
  }

}

Přidejte si to do činnosti:

  private SensorManager mSensorManager;

  private ShakeEventListener mSensorListener;

...

V onCreate () přidat:

    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();
      }
    });

a:

@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();
  }

Zde je další kód pro toto:

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);
            }
        }
    }

Jsem rozvoj detekce pohybu a aplikace shake-detekce pro můj univerzitní projekt.

Vedle původního cíle žádosti jsem rozštěpení knihovní prvek (odpovědný za pohyb a třepe detekce) z aplikace. Kód je zdarma k dispozici na SourceForge s názvem projektu „BenderCatch“. Dokumentace jsem výroby bude připravena kolem poloviny září. http://sf.net/projects/bendercatch

Používá přesnější způsob detekce chvění: hodinky oba rozdíl síly mezi SensorEvents A oscilací přítomných v X a ose Y při provádění chvění. To může dokonce ani hlásku (nebo vibrovat) na každé kmitání chvění.

Neváhejte a zeptejte se mě ještě na e-mailové adrese Raffaele [at] Terzignu [dot] cz

Jsem napsal malý příklad pro zjišťování svislých a vodorovných koktejly a ukazující 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();
            }
        }
    }
}

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();
    }


}

Bavit.

Tady je další implementace, která navazuje na některé z tipů zde, stejně jako kód z Android vývojáře webu.

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();
    }
}

Můžete použít seizmické . Jako příklad je možné nalézt zde .

// 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;
    }
}
}
}

Zkoušel jsem několik implementací, ale rád bych se podělil o své vlastní. To používá G-forcejako jednotka pro výpočet prahových hodnot. To dělá to trochu jednodušší pochopit, co se děje, a také s nastavením dobrý práh.

To jednoduše registruje zvýšení G síly a spouští posluchače, pokud přesáhne určitou prahovou hodnotu. Nepoužívá žádné prahy směr, protože nemáte opravdu potřebujete, že jen chtějí zaregistrovat dobrý chvění, když se.

Of-samozřejmě budete potřebovat standardní registraci a Zrušením registrace tohoto posluchače se v Activity.

Také zkontrolovat, jaké prahové hodnoty je třeba, doporučuji následující aplikace (nejsem žádným způsobem spojena s tímto 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();

            }
        }

    }

}

Moc se mi líbilo Peterdk je odpověď. Vzal jsem to na sebe, aby se coulpe o vylepšení svého kódu.

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);
            }
        }
    }
}

Také nezapomeňte, že budete muset zaregistrovat instance ShakeDetector s 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);

 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;
    }   

}

Možná budete chtít vyzkoušet open source tinybus . S ním třást detekce je tak jednoduché, jak to.

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();
    }
}

Využívá seismické detekce chvění.

Práce se mnou 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) {}
}