Didacticiel getRotationMatrix et getOrientation

J'ai été aux prises avec l'obtention de la véritable orientation de mon appareil à l'aide de getOrientation. L'obtention de l'accéléromètre et du champ magnétique, les lectures par TYPE_ACCELEROMETER et TYPE_MAGNETIC_FIELD est simple qu'est l'obtention de l'orientation via TYPE_ORIENTATION. Mais l'obtention de l'orientation selon le monde coordonner au système à l'aide de getOrientation. Il y a un certain nombre de bons tutoriels là ici et ici mais je n'ai pas encore de mettre tout cela ensemble. À cette fin, j'ai été le développement d'une application que tout simplement cracher de l'Accéléromètre, du Champ Magnétique, raw Orientation de données, et l'Orientation de données à partir de getOrientation. J'ai joint le code, mais il échoue constamment sur mon téléphone. Des suggestions?

package com.sensorall;
import com.sensorall.R;
import android.hardware.*;
import android.app.Activity;
import android.os.Bundle;
import android.widget.TextView;
public class OrientationAccelerometer extends Activity {
SensorManager sensorManager;
float[] mGravs = new float[3];
float[] mGeoMags = new float[3];
float[] mRotationM = new float[16];
float[] mInclinationM = new float[16];
float[] mOrientation = new float[3];
float[] mOldOreintation = new float[3];
String[] mAccelerometer =  new String[3];
String[] mMagnetic =  new String[3];    
String[] mRotation =  new String[16];
String[] mInclination =  new String[16];
String[] mOrientationString =  new String[3];
String[] mOldOreintationString =  new String[3];
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.orientationaccelerometer);
sensorManager = (SensorManager)getSystemService(SENSOR_SERVICE);
} /* End onCreate activity */
private SensorEventListener sensorEventListener = new SensorEventListener() {
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
/* Get the Sensors */
public void onSensorChanged(SensorEvent event) {
switch (event.sensor.getType()) {
case Sensor.TYPE_ACCELEROMETER:
System.arraycopy(event.values, 0, mGravs, 0, 3);
break;
case Sensor.TYPE_MAGNETIC_FIELD:
System.arraycopy(event.values, 0, mGeoMags, 0, 3);
break;
case Sensor.TYPE_ORIENTATION:
System.arraycopy(event.values, 0, mOldOreintation, 0, 3);
break;
default:
return;
}
//If mGravs and mGeoMags have values then find rotation matrix
if (mGravs != null && mGeoMags != null) {
//checks that the rotation matrix is found
boolean success = SensorManager.getRotationMatrix(mRotationM, mInclinationM, mGravs, mGeoMags);
if (success) {
/* getOrientation Values */   
SensorManager.getOrientation(mRotationM, mOrientation);
for(int i=0; i<2; i++){
mAccelerometer[i] = Float.toString(mGravs[i]);
mMagnetic[i] = Float.toString(mGeoMags[i]);
mOrientationString[i] = Float.toString(mOrientation[i]);
mOldOreintationString[i] = Float.toString(mOldOreintation[i]);
}
/* Make everything text to show on device */
TextView xaxisAccelerometerText = (TextView)findViewById(R.id.xaxisAccelerometer);
xaxisAccelerometerText.setText(mAccelerometer[0]);      
TextView yaxisAccelerometerText = (TextView)findViewById(R.id.yaxisAccelerometer);
yaxisAccelerometerText.setText(mAccelerometer[1]);
TextView zaxisAccelerometerText = (TextView)findViewById(R.id.zaxisAccelerometer);
zaxisAccelerometerText.setText(mAccelerometer[2]);    
TextView xaxisMagneticText = (TextView)findViewById(R.id.xaxisMagnetic);
xaxisMagneticText.setText(mMagnetic[0]);    
TextView yaxisMagneticText = (TextView)findViewById(R.id.yaxisMagnetic);
yaxisMagneticText.setText(mMagnetic[1]);
TextView zaxisMagneticText = (TextView)findViewById(R.id.zaxisMagnetic);
zaxisMagneticText.setText(mMagnetic[2]);
TextView xaxisOrientationText = (TextView)findViewById(R.id.xaxisOrientation);
xaxisOrientationText.setText(mOrientationString[0]);    
TextView yaxisOrientationText = (TextView)findViewById(R.id.yaxisOrientation);
yaxisOrientationText.setText(mOrientationString[1]);
TextView zaxisOrientationText = (TextView)findViewById(R.id.zaxisOrientation);
zaxisOrientationText.setText(mOrientationString[2]);
TextView xaxisOldOrientationText = (TextView)findViewById(R.id.xaxisOldOrientation);
xaxisOldOrientationText.setText(mOldOreintationString[0]);      
TextView yaxisOldOrientationText = (TextView)findViewById(R.id.yaxisOldOrientation);
yaxisOldOrientationText.setText(mOldOreintationString[1]);
TextView zaxisOldOrientationText = (TextView)findViewById(R.id.zaxisOldOrientation);
zaxisOldOrientationText.setText(mOldOreintationString[2]);
}else{
/* Make everything text to show on device even if getRotationMatrix fails*/
String matrixFailed = "Rotation Matrix Failed";
TextView xaxisAccelerometerText = (TextView)findViewById(R.id.xaxisAccelerometer);
xaxisAccelerometerText.setText(mAccelerometer[0]);      
TextView yaxisAccelerometerText = (TextView)findViewById(R.id.yaxisAccelerometer);
yaxisAccelerometerText.setText(mAccelerometer[1]);
TextView zaxisAccelerometerText = (TextView)findViewById(R.id.zaxisAccelerometer);
zaxisAccelerometerText.setText(mAccelerometer[2]);    
TextView xaxisMagneticText = (TextView)findViewById(R.id.xaxisMagnetic);
xaxisMagneticText.setText(mMagnetic[0]);    
TextView yaxisMagneticText = (TextView)findViewById(R.id.yaxisMagnetic);
yaxisMagneticText.setText(mMagnetic[1]);
TextView zaxisMagneticText = (TextView)findViewById(R.id.zaxisMagnetic);
zaxisMagneticText.setText(mMagnetic[2]);
TextView xaxisOrientationText = (TextView)findViewById(R.id.xaxisOrientation);
xaxisOrientationText.setText(matrixFailed);     
TextView yaxisOrientationText = (TextView)findViewById(R.id.yaxisOrientation);
yaxisOrientationText.setText(matrixFailed);
TextView zaxisOrientationText = (TextView)findViewById(R.id.zaxisOrientation);
zaxisOrientationText.setText(matrixFailed);
TextView xaxisOldOrientationText = (TextView)findViewById(R.id.xaxisOldOrientation);
xaxisOldOrientationText.setText(mOldOreintationString[0]);      
TextView yaxisOldOrientationText = (TextView)findViewById(R.id.yaxisOldOrientation);
yaxisOldOrientationText.setText(mOldOreintationString[1]);
TextView zaxisOldOrientationText = (TextView)findViewById(R.id.zaxisOldOrientation);
zaxisOldOrientationText.setText(mOldOreintationString[2]);
}
}
}
};
@Override
protected void onResume() {
super.onResume();
sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER), SensorManager.SENSOR_DELAY_NORMAL);
sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD), SensorManager.SENSOR_DELAY_NORMAL);
sensorManager.registerListener(sensorEventListener, sensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION), SensorManager.SENSOR_DELAY_NORMAL);
}
protected void onPause() {
super.onPause();
sensorManager.unregisterListener(sensorEventListener);
}    
}

source d'informationauteur John Kossik | 2011-08-12