这个加速度计传感器监听器背后使用了啥逻辑
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【中文标题】这个加速度计传感器监听器背后使用了啥逻辑【英文标题】：What logic is used behind this accelerometer sensor listener这个加速度计传感器监听器背后使用了什么逻辑 【发布时间】：2011-08-08 19:44:49 【问题描述】：这是我用来捕捉手机震动的代码：
public void onSensorChanged(SensorEvent event)
Sensor mySensor = event.sensor;
if (mySensor.getType() == SensorManager.SENSOR_ACCELEROMETER)
long curTime = System.currentTimeMillis();
// only allow one update every 100ms.
if ((curTime - lastUpdate) > 100)
long diffTime = (curTime - lastUpdate);
lastUpdate = curTime;
x = event.values[SensorManager.DATA_X];
y = event.values[SensorManager.DATA_Y];
z = event.values[SensorManager.DATA_Z];
float speed = Math.abs(x+y+z - last_x - last_y - last_z)/ diffTime * 10000;
if (speed > SHAKE_THRESHOLD_HIGH)
// yes, this is a shake action! Do something about it!
handshake_score.setText(String.valueOf(speed));
new AlertDialog.Builder(Handshake.this)
.setCancelable(true)
.setIcon(android.R.drawable.ic_dialog_info)
.setTitle("noo")
.setMessage("too much")
.setPositiveButton("OK!", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int whichButton)
dialog.cancel();
)
.show();
last_x = x;
last_y = y;
last_z = z;
else if (speed > SHAKE_THRESHOLD_PASS)
// yes, this is a shake action! Do something about it!
handshake_score.setText(String.valueOf(speed));
sensorMgr.unregisterListener(this);
new AlertDialog.Builder(Handshake.this)
.setCancelable(true)
.setIcon(android.R.drawable.ic_dialog_info)
.setTitle("HAHAA!")
.setMessage("good")
.setPositiveButton("OK!", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int whichButton)
dialog.cancel();
)
.show();
finish();
else if (speed > SHAKE_THRESHOLD_SMALL)
// yes, this is a shake action! Do something about it!
handshake_score.setText(String.valueOf(speed));
new AlertDialog.Builder(Handshake.this)
.setCancelable(true)
.setIcon(android.R.drawable.ic_dialog_info)
.setTitle("boo")
.setMessage("not enough")
.setPositiveButton("OK!", new DialogInterface.OnClickListener()
public void onClick(DialogInterface dialog, int whichButton)
dialog.cancel();
)
.show();
last_x = x;
last_y = y;
last_z = z;
last_x = x;
last_y = y;
last_z = z;
我想要做的是模仿握手，这样当水平握住手机时它会响应上下抬起手机，就好像你面对横向屏幕并上下移动它一样。
虽然此代码响应扭转手机，就好像您围绕其长度轴旋转手机一样。
有人能解释一下这段代码中使用的坐标 x、y 和 z 背后的逻辑吗？这些在手机中的位置是什么？我如何让凤凰响应“握手”而不是在你的手中扭动它。
对此类代码有什么想法吗？
【问题讨论】：
【参考方案1】：将此添加到您的活动类中
/* 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 onStop()
mSensorManager.unregisterListener(mSensorListener);
super.onStop();
并将其添加到您的 onCreate 方法中：
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;
我希望这会有所帮助
【讨论】：
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