Android acceleration sensor enables "Shake" with mobile phone Vibration

Because there are a lot of codes, I wrote them separately, and the comments are still detailed to facilitate the study of Activitypackage com. lmw. android. test; import android. app. activity; import android. OS. bundle; import android. OS. handler; import android. OS. vibrator; import android. view. view; import android. widget. toast; import com. lmw. android. test. shakeListener. onShakeListener; public class ShakeActivity extends Activity {ShakeListener mShakeListener = null; Vibrator mVibrator; @ Overridepublic Void onCreate (Bundle savedInstanceState) {// TODO Auto-generated method stubsuper. onCreate (savedInstanceState); setContentView (R. layout. shake); // drawerSet (); // set the direction of the drawer listener switch button // get the Vibrator service mVibrator = (Vibrator) getApplication (). getSystemService (VIBRATOR_SERVICE); // instantiate the acceleration sensor detection class mShakeListener = new ShakeListener (ShakeActivity. this); mShakeListener. setOnShakeListener (new OnShakeListener () {public Void onShake () {mShakeListener. stop (); startVibrato (); // start to vibrate new Handler (). postDelayed (new Runnable () {@ Overridepublic void run () {Toast mtoast; mtoast = Toast. makeText (ShakeActivity. this, "Haha, success !. \ N try again! ", 1000); mtoast. show (); mVibrator. cancel (); mShakeListener. start () ;}}, 2000) ;}}) ;}// defines the public void startVibrato () {mVibrator. vibrate (new long [] {500,200,500,200},-1); // The first {} contains the rhythm array, // The second parameter is the number of repetitions, and-1 is not repeated, if the value is not-1, it starts to repeat the specified subscript of pattern.} @ Overrideprotected void onDestroy () {super. onDestroy (); if (mShakeListener! = Null) {mShakeListener. stop () ;}} ShakeListener/*** a listener * accelerometer * values [0]: x-axis acceleration * values [1]: y-axis direction acceleration * values [2]: z-axis direction acceleration */public class ShakeListener implements SensorEventListener {// The speed threshold, when the shaking speed reaches this value, private static final int SPEED_SHRESHOLD = 3000; // interval between the two checks: private static final int UPTATE_INTERVAL_TIME = 70; // sensor manager private SensorManager sensorManager; // Sensor Private Sensor sensor; // gravity Sensor listener private OnShakeListener onShakeListener; // Context private Context mContext; // gravity sensing coordinate private float lastX; private float lastY when the last position on the mobile phone; private float lastZ; // last detection time private long lastUpdateTime; // The constructor public ShakeListener (Context c) {// obtain the listening object mContext = c; start ();} // start public void start () {// obtain the sensor manager sensorManager = (SensorManager) mContext. getSystemService (Context. SENSOR_S ERVICE); if (sensorManager! = Null) {// obtain the gravity sensor Sensor = sensorManager. getdefasensensor (sensor. TYPE_ACCELEROMETER);} // register if (sensor! = Null) {// There are also SENSOR_DELAY_UI, SENSOR_DELAY_FASTEST, SENSOR_DELAY_GAME, etc. // depending on the application, the desired response rate is different. Set sensorManager according to the actual situation. registerListener (this, sensor, SensorManager. SENSOR_DELAY_NORMAL) ;}}// stop public void stop () {sensorManager. unregisterListener (this);} // set the gravity sensor listener public void setOnShakeListener (OnShakeListener listener) {onShakeListener = listener;} // The gravity sensor senses the change data public void onSensorChanged (SensorEvent) {// The current detection time is long currentUpdateTime = System. currentTimeMillis (); // interval between two checks long timeInterval = currentUpdateTime-lastUpdateTime; // you can determine whether the detection interval has been reached if (timeInterval <UPTATE_INTERVAL_TIME) return; // The current time is changed to lastUpdateTime = currentUpdateTime; // obtain the x, y, and zcoordinate float x = event. values [0]; float y = event. values [1]; float z = event. values [2]; // obtain the changing values of x, y, and z, float deltaX = x-lastX; float deltaY = y-lastY; float deltaZ = z-lastZ; // convert the current coordinate to the last coordinate lastX = x; lastY = y; lati = z; double speed = Math. sqrt (deltaX * deltaX + deltaY * deltaY + deltaZ * deltaZ)/timeInterval * 10000; // if (speed> = SPEED_SHRESHOLD) {onShakeListener is prompted when the speed threshold is reached. onShake () ;}}// this method is called back when the Sensor precision changes. public void onAccuracyChanged (sensor Sensor, int accuracy) {}// shake listener interface public interface OnShakeListener {public void onShake ();}}