android_利用重力感应检测摇晃手机的速度

android 利用重力感应检测摇晃手机的速度（音乐播放器实现甩歌） 八月 17th, 2010 by admin 0 这是一段网上找的利用重力感应检测摇晃手机的速度代码，结合前几天写的音乐播放器，成功实现了甩歌功能。 package com.pocketdigi; import android.app.Activity; import android.os.Bundle; import android.util.Log; import android.widget.Toast; import android.hardware.SensorListener; import android.hardware.SensorManager; import android.hardware.Sensor; @SuppressWarnings("deprecation") public class main extends Activity implements SensorListener { private float x, y, z,last_x,last_y,last_z; private long lastUpdate; protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); SensorManager sensorMgr = (SensorManager) getSystemService(SENSOR_SERVICE); Sensor sensor = sensorMgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER); sensorMgr.registerListener(this,SensorManager.SENSOR_ACCELEROMETER,SensorManager.SENSOR_DELAY_GAME); } @Override public void onAccuracyChanged(int sensor, int accuracy) { // TODO Auto-generated method stub } private static final int SHAKE_THRESHOLD = 5000; //这个控制精度，越小表示反应越灵敏 @Override public void onSensorChanged(int sensor, float[] values) { // TODO Auto-generated method stub if (sensor == SensorManager.SENSOR_ACCELEROMETER) { long curTime = System.currentTimeMillis(); // 每100毫秒检测一次 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) { //检测到摇晃后执行的代码 } last_x = x; last_y = y; last_z = z; } } } }