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anddev.org • View topic - Detect direction of shake movement in SensorListener

Detect direction of shake movement in SensorListener

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Detect direction of shake movement in SensorListener

Postby tsemann » Fri Jan 14, 2011 12:16 pm

Hello developers,

I have got a problem concerning the SensorListener. At the moment I can already detect if the phone got shaken. Addtionally I now want to detect in which direction the phone is shaken. Do you maybe know which values I have to consider to detect this?

My code at the moment looks like this:

Code: Select all

import android.app.Activity;
import android.hardware.SensorListener;
import android.hardware.SensorManager;
import android.os.Bundle;
import android.util.Log;
import android.widget.Toast;

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 float raw_x, last_raw_x;
   private static final int SHAKE_THRESHOLD = 800;
   private final float shakeThreshold = 1.5f;

   protected void onCreate(Bundle savedInstanceState) {
      super.onCreate(savedInstanceState);

      setContentView(R.layout.main);
      // 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) {
      Log.d("sensor", "onSensorChanged: " + sensor);
      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];
            raw_x = SensorManager.GRAVITY_EARTH;

            float xChange = Math.abs(x - last_x);
            float speed = Math.abs(x + y + z - last_x - last_y - last_z)
                  / diffTime * 10000;

            float deltaX = Math.abs(last_x - x);
            float deltaY = Math.abs(last_y - y);
            float deltaZ = Math.abs(last_z - y);
            float delta_raw_x = raw_x - last_raw_x;
            // Log.d("sensor", "diff: " + diffTime + " - speed: " + speed);
            if (speed > SHAKE_THRESHOLD) {
               Log.d("sensor", "shake detected w/ speed: " + speed);
               Toast.makeText(
                     this,
                     "shake detected w/ speed: " + speed + "; accelX: "
                           + xChange, Toast.LENGTH_SHORT).show();
               // now left,right,up,down movement has to be detected
               // somehow
            }
            last_x = x;
            last_y = y;
            last_z = z;
            last_raw_x = raw_x;
         }
      }
   }
}


Best regards,
tsemann
tsemann
Freshman
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Posts: 9
Joined: Thu Jan 13, 2011 8:19 pm

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