屋内ナビゲーション用のアプリケーションを開発していますが、値を解釈できません。ここに私のコードスニペットがあります:
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;
}
}
...そしてここにログ (デバイスは X 方向に約 0.5 メートル移動されました。):
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: -3.7859E 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 : -0.0015618263 X: 7.4E9 7.4319 -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-4 Y: -18.3 E -4 Z：-0.0017769502 X：0.0010219973 Y：-2.7528123E -4 Z：-0.001836354 X：0.0011270456 Y：-3.19711E -4 Z：-0.00193322607 X：0.001273372525525525999999999999999999999999999999999999999999999999999999999999999992 : 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 : -0.002185045 X: 0.0022671057 Y: -5.1701383E-4 Z : -0.0022573534 X : 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：-0.002527368 X：0.0028299019 Y：-7.829082E -4 Z：-0.0025947813 x 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: -0.00285914 X: 0.0028E-4 : -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