如何使用android检测震动事件？

Question

How can I detect a shake event with android? How can I detect the shake direction?

I want to change the image in an imageview when shaking occurs.

Answer 1

From the code point of view, you need to implement the SensorListener:

public class ShakeActivity extends Activity implements SensorListener

You will need to acquire a SensorManager:

sensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE);

And register this sensor with desired flags:

sensorMgr.registerListener(this,
SensorManager.SENSOR_ACCELEROMETER,
SensorManager.SENSOR_DELAY_GAME);

In your onSensorChange() method, you determine whether it's a shake or not:

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) {
        Log.d("sensor", "shake detected w/ speed: " + speed);
        Toast.makeText(this, "shake detected w/ speed: " + speed, Toast.LENGTH_SHORT).show();
      }
      last_x = x;
      last_y = y;
      last_z = z;
    }
  }
}

The shake threshold is defined as:

private static final int SHAKE_THRESHOLD = 800;

There are some other methods too, to detect shake motion. look at this link. (If that link does not work or link is dead, look at this web archive .).

Have a look at this example for android shake detect listener.

Note: SensorListener is deprecated. we can use SensorEventListener instead. Here is a quick example using SensorEventListener.

Thanks.

Answer 2

Google helps a lot .

/* The following code was written by Matthew Wiggins
 * and is released under the APACHE 2.0 license
 *
 * http://www.apache.org/licenses/LICENSE-2.0
 */
package com.hlidskialf.android.hardware;

import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.content.Context;
import java.lang.UnsupportedOperationException;

public class ShakeListener implements SensorListener 
{
  private static final int FORCE_THRESHOLD = 350;
  private static final int TIME_THRESHOLD = 100;
  private static final int SHAKE_TIMEOUT = 500;
  private static final int SHAKE_DURATION = 1000;
  private static final int SHAKE_COUNT = 3;

  private SensorManager mSensorMgr;
  private float mLastX=-1.0f, mLastY=-1.0f, mLastZ=-1.0f;
  private long mLastTime;
  private OnShakeListener mShakeListener;
  private Context mContext;
  private int mShakeCount = 0;
  private long mLastShake;
  private long mLastForce;

  public interface OnShakeListener
  {
    public void onShake();
  }

  public ShakeListener(Context context) 
  { 
    mContext = context;
    resume();
  }

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

  public void resume() {
    mSensorMgr = (SensorManager)mContext.getSystemService(Context.SENSOR_SERVICE);
    if (mSensorMgr == null) {
      throw new UnsupportedOperationException("Sensors not supported");
    }
    boolean supported = mSensorMgr.registerListener(this, SensorManager.SENSOR_ACCELEROMETER, SensorManager.SENSOR_DELAY_GAME);
    if (!supported) {
      mSensorMgr.unregisterListener(this, SensorManager.SENSOR_ACCELEROMETER);
      throw new UnsupportedOperationException("Accelerometer not supported");
    }
  }

  public void pause() {
    if (mSensorMgr != null) {
      mSensorMgr.unregisterListener(this, SensorManager.SENSOR_ACCELEROMETER);
      mSensorMgr = null;
    }
  }

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

  public void onSensorChanged(int sensor, float[] values) 
  {
    if (sensor != SensorManager.SENSOR_ACCELEROMETER) return;
    long now = System.currentTimeMillis();

    if ((now - mLastForce) > SHAKE_TIMEOUT) {
      mShakeCount = 0;
    }

    if ((now - mLastTime) > TIME_THRESHOLD) {
      long diff = now - mLastTime;
      float speed = Math.abs(values[SensorManager.DATA_X] + values[SensorManager.DATA_Y] + values[SensorManager.DATA_Z] - mLastX - mLastY - mLastZ) / diff * 10000;
      if (speed > FORCE_THRESHOLD) {
        if ((++mShakeCount >= SHAKE_COUNT) && (now - mLastShake > SHAKE_DURATION)) {
          mLastShake = now;
          mShakeCount = 0;
          if (mShakeListener != null) { 
            mShakeListener.onShake(); 
          }
        }
        mLastForce = now;
      }
      mLastTime = now;
      mLastX = values[SensorManager.DATA_X];
      mLastY = values[SensorManager.DATA_Y];
      mLastZ = values[SensorManager.DATA_Z];
    }
  }

}

Answer 3

You can also take a look on library Seismic

public class Demo extends Activity implements ShakeDetector.Listener {
  @Override protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    SensorManager sensorManager = (SensorManager) getSystemService(SENSOR_SERVICE);
    ShakeDetector sd = new ShakeDetector(this);
    sd.start(sensorManager);

    TextView tv = new TextView(this);
    tv.setGravity(CENTER);
    tv.setText("Shake me, bro!");
    setContentView(tv, new LayoutParams(MATCH_PARENT, MATCH_PARENT));
  }

  @Override public void hearShake() {
    Toast.makeText(this, "Don't shake me, bro!", Toast.LENGTH_SHORT).show();
  }
}

Answer 4

There are a lot of solutions to this question already, but I wanted to post one that:

• Doesn't use a library depricated in API 3
• Calculates the magnitude of the acceleration correctly
• Correctly applies a timeout between shake events

Here is such a solution:

// variables for shake detection
private static final float SHAKE_THRESHOLD = 3.25f; // m/S**2
private static final int MIN_TIME_BETWEEN_SHAKES_MILLISECS = 1000;
private long mLastShakeTime;
private SensorManager mSensorMgr;

To initialize the timer:

// Get a sensor manager to listen for shakes
mSensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE);

// Listen for shakes
Sensor accelerometer = mSensorMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
if (accelerometer != null) {
    mSensorMgr.registerListener(this, accelerometer, SensorManager.SENSOR_DELAY_NORMAL);
}

SensorEventListener methods to override:

@Override
public void onSensorChanged(SensorEvent event) {
    if (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER) {
        long curTime = System.currentTimeMillis();
        if ((curTime - mLastShakeTime) > MIN_TIME_BETWEEN_SHAKES_MILLISECS) {

            float x = event.values[0];
            float y = event.values[1];
            float z = event.values[2];

            double acceleration = Math.sqrt(Math.pow(x, 2) +
                    Math.pow(y, 2) +
                    Math.pow(z, 2)) - SensorManager.GRAVITY_EARTH;
            Log.d(APP_NAME, "Acceleration is " + acceleration + "m/s^2");

            if (acceleration > SHAKE_THRESHOLD) {
                mLastShakeTime = curTime;
                Log.d(APP_NAME, "Shake, Rattle, and Roll");
            }
        }
    }
}

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

When you are all done

// Stop listening for shakes
mSensorMgr.unregisterListener(this);

Answer 5

Since SensorListener is deprecated so use the following code:

/* 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();
}

Then:

/* 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;

The question with full details could be found here:

Android: I want to shake it

Answer 6

This is for Kotlin and use SensorEventListener

Create new class ShakeDetector

class ShakeDetector : SensorEventListener {
    private var mListener: OnShakeListener? = null
    private var mShakeTimestamp: Long = 0
    private var mShakeCount = 0
    fun setOnShakeListener(listener: OnShakeListener?) {
        mListener = listener
    }

    interface OnShakeListener {
        fun onShake(count: Int)
    }

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

    override fun onSensorChanged(event: SensorEvent) {
        if (mListener != null) {
            val x = event.values[0]
            val y = event.values[1]
            val z = event.values[2]
            val gX = x / SensorManager.GRAVITY_EARTH
            val gY = y / SensorManager.GRAVITY_EARTH
            val gZ = z / SensorManager.GRAVITY_EARTH
            // gForce will be close to 1 when there is no movement.
            val gForce: Float = sqrt(gX * gX + gY * gY + gZ * gZ)
            if (gForce > SHAKE_THRESHOLD_GRAVITY) {
                val 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)
            }
        }
    }

    companion object {
        /*
     * 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 const val SHAKE_THRESHOLD_GRAVITY = 2.7f
        private const val SHAKE_SLOP_TIME_MS = 500
        private const val SHAKE_COUNT_RESET_TIME_MS = 3000
    }
}

Your main Activity

class MainActivity : AppCompatActivity() {

    // The following are used for the shake detection
    private var mSensorManager: SensorManager? = null
    private var mAccelerometer: Sensor? = null
    private var mShakeDetector: ShakeDetector? = null

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        setContentView(R.layout.activity_main)
        initSensor()
    }
    override fun onResume() {
        super.onResume()
        // Add the following line to register the Session Manager Listener onResume
        mSensorManager!!.registerListener(
            mShakeDetector,
            mAccelerometer,
            SensorManager.SENSOR_DELAY_UI
        )
    }

    override fun onPause() { // Add the following line to unregister the Sensor Manager onPause
        mSensorManager!!.unregisterListener(mShakeDetector)
        super.onPause()
    }

    private fun initSensor() {
        // ShakeDetector initialization
        // ShakeDetector initialization
        mSensorManager = getSystemService(SENSOR_SERVICE) as SensorManager
        mAccelerometer = mSensorManager!!.getDefaultSensor(Sensor.TYPE_ACCELEROMETER)
        mShakeDetector = ShakeDetector()
        mShakeDetector!!.setOnShakeListener(object : OnShakeListener {
            override fun onShake(count: Int) { /*
                 * The following method, "handleShakeEvent(count):" is a stub //
                 * method you would use to setup whatever you want done once the
                 * device has been shook.
                 */
                Toast.makeText(this@MainActivity, count.toString(), Toast.LENGTH_SHORT).show()
            }
        })
    }
}

Finally add this code to Manifests to make sure the phone has an accelerometer

<uses-feature android:name="android.hardware.sensor.accelerometer" android:required="true" />

Answer 7

You can use Seismic :

See the code here:

https://github.com/square/seismic/blob/master/library/src/main/java/com/squareup/seismic/ShakeDetector.java

Answer 8

Do the following:

private float xAccel, yAccel, zAccel;
private float xPreviousAccel, yPreviousAccel, zPreviousAccel;
private boolean firstUpdate = true;
private final float shakeThreshold = 1.5f;
private boolean shakeInitiated = false;
SensorEventListener mySensorEventListener;
SensorManager mySensorManager;

Put this in onCreate method.

mySensorManager = (SensorManager) getSystemService(Context.SENSOR_SERVICE);
    mySensorManager.registerListener(mySensorEventListener,
            mySensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),
            SensorManager.SENSOR_DELAY_NORMAL);

And now the main part.

private boolean isAccelerationChanged() {
    float deltaX = Math.abs(xPreviousAccel - xAccel);
    float deltaY = Math.abs(yPreviousAccel - yAccel);
    float deltaZ = Math.abs(zPreviousAccel - zAccel);
    return (deltaX > shakeThreshold && deltaY > shakeThreshold)
            || (deltaX > shakeThreshold && deltaZ > shakeThreshold)
            || (deltaY > shakeThreshold && deltaZ > shakeThreshold);
}

private void updateAccelParameters(float xNewAccel, float yNewAccel, float zNewAccel) {
    if (firstUpdate) {
        xPreviousAccel = xNewAccel;
        yPreviousAccel = yNewAccel;
        zPreviousAccel = zNewAccel;
        firstUpdate = false;
    }else{
        xPreviousAccel = xAccel;
        yPreviousAccel = yAccel;
        zPreviousAccel = zAccel;
    }
    xAccel = xNewAccel;
    yAccel = yNewAccel;
    zAccel = zNewAccel;
}

private void executeShakeAction() {
    //this method is called when devices shakes
}

public void onSensorChanged(SensorEvent se) {
    updateAccelParameters(se.values[0], se.values[1], se.values[2]);
    if ((!shakeInitiated) && isAccelerationChanged()) {
        shakeInitiated = true;
    }else if ((shakeInitiated) && isAccelerationChanged()){
        executeShakeAction();
    }else if((shakeInitiated) && (!isAccelerationChanged())){
        shakeInitiated = false;
    }
}

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

Answer 9

Dont forget to add this code in your MainActivity.java :

MainActivity.java

mShaker = new ShakeListener(this);
mShaker.setOnShakeListener(new ShakeListener.OnShakeListener () {
    public void onShake() {
        Toast.makeText(MainActivity.this, "Shake " , Toast.LENGTH_LONG).show();        
    }
});

@Override
protected void onResume() {
    super.onResume();
    mShaker.resume();
}

@Override
protected void onPause() {
    super.onPause();
    mShaker.pause();
}

Or I give you a link about this stuff.