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;
}
}
}
}