我正在开发室内导航应用程序，但我无法解释这些值。这是我的代码片段：
public class MainActivity extends Activity implements SensorEventListener {
private SensorManager sensorManager;
TextView xCoor; // declare X axis object
TextView yCoor; // declare Y axis object
TextView zCoor; // declare Z axis object
Button button;
float[] linear_acceleration = new float[3];
float[] gravity = new float[3];
float[] distanceInMeter = new float[3];
float[] speed = new float[3];
long timeStamp;
float dT;
private boolean firstTimeOfMeasurement = false;
@Override
public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
xCoor=(TextView)findViewById(R.id.xcoor);
yCoor=(TextView)findViewById(R.id.ycoor);
zCoor=(TextView)findViewById(R.id.zcoor);
button=(Button)findViewById(R.id.button1);
sensorManager=(SensorManager)getSystemService(SENSOR_SERVICE);
button.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
sensorManager.registerListener(MainActivity.this,
sensorManager.getDefaultSensor(Sensor.TYPE_LINEAR_ACCELERATION),
SensorManager.SENSOR_DELAY_FASTEST);
firstTimeOfMeasurement = false;
}
});
}
public void onSensorChanged(SensorEvent event){
// check sensor type
if(event.sensor.getType()==Sensor.TYPE_LINEAR_ACCELERATION){
if(!firstTimeOfMeasurement ){
firstTimeOfMeasurement = true;
timeStamp = event.timestamp;
speed[0] = speed[1] = speed[2] = 0;
distanceInMeter[0] = distanceInMeter[1] = distanceInMeter[2] = 0;
}
else{
dT= (event.timestamp - timeStamp) / 1000000000.0f;
timeStamp = event.timestamp;
calculateDistance(event.values, dT);
xCoor.setText("X: " + Float.toString(distanceInMeter[0]));
yCoor.setText("Y: " + Float.toString(distanceInMeter[1]));
zCoor.setText("Z: " + Float.toString(distanceInMeter[2]));
Log.d("","X: " + Float.toString(distanceInMeter[0]) + " Y: " + Float.toString(distanceInMeter[1]) + " Z : " + Float.toString(distanceInMeter[2]));
}
}
}
public void calculateDistance (float[] acceleration, float deltaTime) {
for (int i = 0; i < acceleration.length; i++) {
speed[i] = acceleration[i] * deltaTime;
distanceInMeter[i] += speed[i] * deltaTime + acceleration[i] * deltaTime * deltaTime / 2;
}
}
...这里是日志（设备在 X 方向上移动了约 0.5 米。）：
X：2.516964E-5 Y：2.3743667E-5 Z：-5.294226E-5 X：4.897119E-5 Y：2.4477049E-5 Z：-1.0725691E-4 X：6.026584E-5 Y：4.4123855E-5 Z：-1.4899505E-4 X：3.9997853E-5 Y：-1.7013517E-6 Z：-1.8953103E-4 X：4.6437595E-5 Y：-5.077744E-6 Z：-2.621123E-4 X：5.7528538 E-5 Y：5.1304473E-6 Z：-2.8128378E-4 X：4.4061002E-5 Y：5.7082625E-6 Z：-3.4537681E-4 X：3.2294975E-5 Y：-1.6293983E-5 Z： -4.103487E-4 X：5.8478785E-5 Y：-1.4691614E-6 Z：-4.9171754E-4 X：6.55654E-5 Y：-2.2436536E-5 Z：-5.5965903E-4 X：4.2109532E- 5 Y：-5.2801708E-5 Z：-6.242801E-4 X：3.8397735E-5 Y：-8.7437686E-5 Z：-6.771843E-4 X：-2.4613353E-5 Y：-1.6809099E-4 Z ：-7.590898E-4 X：-4.7245518E-5 Y：-2.0863091E-4 Z：-8.195847E-4 X：-6.6750574E-5 Y：-2.5927206E-4 Z：-8.85209E-4 X： -6.952324E-5 Y：-2.9220866E-4 Z：-9.949753E-4 X：-8.74085E-5 Y：-3.4179245E-4 Z：-0。0010735805 X：-1.0780102E-4 Y：-3.5630423E-4 Z：-0.0011248525 X：-1.19364566E-4 Y：-3.3947633E-4 Z：-0.001229486 X：-1.549891E-4 Y：-3.7859 4 Z：-0.0013151368 X：-1.5717075E-4 Y：-3.702779E-4 Z：-0.0013620423 X：-2.5051413E-6 Y：-1.9888686E-4 Z：-0.0013941963 X：1.4368152E-4 Y： 3.9539344E-5 Z：-0.0014529589 X：2.6982307E-4 Y：2.944292E-5 Z：-0.0015093404 X：4.395193E-4 Y：7.502221E-5 Z：-0.0015618E-74 X：6.23E-499 -5 Z：-0.0015917926 X：7.617797E-4 Y：-5.3465046E-6 Z：-0.0016443293 X：8.4774144E-4 Y：-1.3927222E-4 Z：-0.0016940705 X：9.120384E-3 Y：-2。 E-4 Z : -0.0017769502 X: 0.0010219973 Y: -2.7528123E-4 Z : -0.0018363354 X: 0.0011270456 Y: -3.19711E-4 Z : -0.0019322607 X: 0.0012737722 Y: -3.4506532E-4 Z : -0.0019969852 X ：0.001502906 Y：-3.835355E-4 Z：-0.0020537905 X：0.0017388286 Y：-4。398609E -4 Z：-0.0021189034 X：0.0019086768 Y：-4.70718E -4 Z：-0.0021404363 X：0.0021076156 Y：-5.0305086E -4 Z：-5.0305086E -4 Z：-0.002185045 Y.001526：-02145 x：-0.002266.170450.000.00045 Y：-000.0002667.10-4.000.000.000.000.000.000.000 e.000.000.000.000.000.000 e.000.000.000.00045 e：-10.000.00045266.170.000.000.000.000byethybo : 0.0024057168 Y: -5.4342125E-4 Z : -0.002310839 X: 0.002512934 Y: -5.4679764E-4 Z : -0.0023926103 X: 0.0025857347 Y: -5.900372E-4 Z : -0.0024241738 X: 0.0026625344 Y: -6.842513E- 4 Z : -0.0024786198 X: 0.0027399021 Y: -7.289082E-4 Z : -0.0025227368 X: 0.0028299019 Y: -7.829082E-4 Z : -0.0025947813 X: 0.0029214222 Y: -8.3661743E-4 Z : -0.0026276957 X: 0.0030301774 Y：-8.8301615E-4 Z：-0.0027011314 X：0.0030617723 Y：-9.42785E-4 Z：-0.0027936357 X：0.0030394243 Y：-9.79083E-4 Z：-0.002859614 X：0.0030：4-221 ：-0.0029144369 X：0.0029567073 Y：-9.6269825E-4 Z：-0.0029774965 X：0.00297403 Y：-9.315846E-4 Z：-0.0030192512 X：0.0030169394 Y：-9.6226286E-4 Z : -0.0030642622 X: 0.0031092423 Y: -0.0010050826 Z : -0.003118441 X: 0.0031988935 Y: -0.0011072198 Z : -0.003198576 X: 0.0033174676 Y: -0.0012394118 Z : -0.0032808 X: 0.0034213979 Y: -0.0013103384 Z : -0.0033766583 X: 0.003445055 Y: -0.0013735284 Z : -0.0034781513 X: 0.0034835928 Y: -0.0014324035 Z : -0.0035485225 X: 0.0034975903 Y: -0.0014486146 Z : -0.0036555608 X: 0.0034793443 Y: -0.0014780854 Z : -0.0037472823 X: 0.0034312923 Y：-0.0015043139 Z：-0.0037952673 X：0.0034234857 Y：-0.001599117 Z：-0.0038744798 X：0.003435113 Y：-0.0016648113 Z：-0.0039600970013735284 Z : -0.0034781513 X: 0.0034835928 Y: -0.0014324035 Z : -0.0035485225 X: 0.0034975903 Y: -0.0014486146 Z : -0.0036555608 X: 0.0034793443 Y: -0.0014780854 Z : -0.0037472823 X: 0.0034312923 Y: -0.0015043139 Z : -0.0037952673 X ：0.0034234857 Y：-0.001599117 Z：-0.0038744798 X：0.003435113 Y：-0.0016648113 Z：-0.0039600970013735284 Z : -0.0034781513 X: 0.0034835928 Y: -0.0014324035 Z : -0.0035485225 X: 0.0034975903 Y: -0.0014486146 Z : -0.0036555608 X: 0.0034793443 Y: -0.0014780854 Z : -0.0037472823 X: 0.0034312923 Y: -0.0015043139 Z : -0.0037952673 X ：0.0034234857 Y：-0.001599117 Z：-0.0038744798 X：0.003435113 Y：-0.0016648113 Z：-0.003960097