Come utilizzare SensorManager.getOrientation() anziché TYPE_ORIENTATION

Question

Sto facendo un'app in Android. L'app ha alcune citazioni salvate nel database e voglio far scorrere le virgolette sullo schermo usando i sensori del telefono. Quindi voglio che quando il telefono si sposta a sinistra posso vedere sullo schermo la citazione successiva e quando sposto il telefono a destra per vedere sullo schermo la citazione precedente. Quale tipo di sensore telefonico pensi sia meglio usare? Sto cercando di usare Type_orientation ma ho l'errore che: questa costante è stata dichiarata obsoleta nel livello API 8. Come posso sostituirla con SensorManager.getOrientation(). O pensi che ci sia qualche altro sensore che è meglio usare per me?

package com.example.prova1; 

import java.util.HashMap; 

import android.app.Activity; 
import android.content.Context; 
import android.content.Intent; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.hardware.Sensor; 
import android.hardware.SensorEvent; 
import android.hardware.SensorEventListener; 
import android.hardware.SensorManager; 
import android.os.Bundle; 
import android.widget.TextView; 



public class SlideQuote extends Activity implements SensorEventListener 
{ 
//a TextView 
private TextView quote; 
private TextView author; 
//the Sensor Manager 
private SensorManager sManager; 
float x; 
int id; 
int total; 
String s1,s2; 
    Database quotedatabase = new Database(this); 


    /** Called when the activity is first created. */ 
    @Override 
    public void onCreate(Bundle savedInstanceState) 
    { 
     super.onCreate(savedInstanceState); 
     setContentView(R.layout.slide_quote); 

     //get the TextView from the layout file 
     quote = (TextView) findViewById(R.id.textView3); 
     author = (TextView) findViewById(R.id.textView4); 
id=1; 
     //get a hook to the sensor service 

     sManager= (SensorManager) getSystemService(Context.SENSOR_SERVICE); 
    if(sManager.getSensorList(Sensor.TYPE_ORIENTATION).size()!=0){ 
     Sensor s =sManager.getSensorList(Sensor.TYPE_ORIENTATION).get(o); 
     sManager.registerListener(this,s ,SensorManager.SENSOR_DELAY_NORMAL); 
     s1= quotedatabase.getQuote(id); 
     s2= quotedatabase.getAuthor(id); 
     total=quotedatabase.getQuotesCount(); 


     quote.setText(s1); 
     author.setText(s2); 
    } 
    } 
    //when this Activity starts 
    @Override 
protected void onResume() 
{ 
    super.onResume(); 
    /*register the sensor listener to listen to the gyroscope sensor, use the 
    callbacks defined in this class, and gather the sensor information as quick 
    as possible*/ 
    sManager.registerListener(this, sManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),SensorManager.SENSOR_DELAY_NORMAL); 
} 

    //When this Activity isn't visible anymore 
@Override 
protected void onStop() 
{ 
    //unregister the sensor listener 
    sManager.unregisterListener(this); 
    super.onStop(); 
} 

@Override 
public void onAccuracyChanged(Sensor arg0, int arg1) 
{ 
    //Do nothing. 
} 

@Override 
public void onSensorChanged(SensorEvent event) 
{ 
    //if sensor is unreliable, return void 
    if (event.accuracy == SensorManager.SENSOR_STATUS_UNRELIABLE) 
    { 
    return; 
    } 
    //else it will output the Roll, Pitch and Yawn values 
    x=event.values[2]; 

    if(x>25){ 
    if(id==total) 
    {id=1; 
    } 
    else{ 

    id++; 
    } 
    s1= quotedatabase.getQuote(id); 
     s2= quotedatabase.getAuthor(id); 
     quote.setText(s1); 
     author.setText(s2); 

    } 
    if(x<-25){ 
    if(id==1) 
    {id=total;} 
    else{ 
    id--;} 

    s1= quotedatabase.getQuote(id); 
     s2= quotedatabase.getAuthor(id);  
     quote.setText(s1); 
     author.setText(s2); 
    } 
    } 
@Override 
public void onBackPressed() { 
    // TODO Auto-generated method stub 
    sManager.unregisterListener(this); 
    Intent backIntent = new Intent(getApplication(), Quote.class); 
     finish(); 
     startActivity(backIntent); 

} 


} 

Answer 1

pagina

The Motion Android sensore sta dando alcuni esempi di utilizzare i sensori:

Android Motion Sensor

Per il giroscopio è possibile utilizzare il seguente codice:

// Create a constant to convert nanoseconds to seconds. 
private static final float NS2S = 1.0f/1000000000.0f; 
private final float[] deltaRotationVector = new float[4](); 
private float timestamp; 

public void onSensorChanged(SensorEvent event) { 
    // This timestep's delta rotation to be multiplied by the current rotation 
    // after computing it from the gyro sample data. 
    if (timestamp != 0) { 
    final float dT = (event.timestamp - timestamp) * NS2S; 
    // Axis of the rotation sample, not normalized yet. 
    float axisX = event.values[0]; 
    float axisY = event.values[1]; 
    float axisZ = event.values[2]; 

    // Calculate the angular speed of the sample 
    float omegaMagnitude = sqrt(axisX*axisX + axisY*axisY + axisZ*axisZ); 

    // Normalize the rotation vector if it's big enough to get the axis 
    // (that is, EPSILON should represent your maximum allowable margin of error) 
    if (omegaMagnitude > EPSILON) { 
     axisX /= omegaMagnitude; 
     axisY /= omegaMagnitude; 
     axisZ /= omegaMagnitude; 
    } 

    // Integrate around this axis with the angular speed by the timestep 
    // in order to get a delta rotation from this sample over the timestep 
    // We will convert this axis-angle representation of the delta rotation 
    // into a quaternion before turning it into the rotation matrix. 
    float thetaOverTwo = omegaMagnitude * dT/2.0f; 
    float sinThetaOverTwo = sin(thetaOverTwo); 
    float cosThetaOverTwo = cos(thetaOverTwo); 
    deltaRotationVector[0] = sinThetaOverTwo * axisX; 
    deltaRotationVector[1] = sinThetaOverTwo * axisY; 
    deltaRotationVector[2] = sinThetaOverTwo * axisZ; 
    deltaRotationVector[3] = cosThetaOverTwo; 
    } 
    timestamp = event.timestamp; 
    float[] deltaRotationMatrix = new float[9]; 
    SensorManager.getRotationMatrixFromVector(deltaRotationMatrix, deltaRotationVector); 
    // User code should concatenate the delta rotation we computed with the current rotation 
    // in order to get the updated rotation. 
    // rotationCurrent = rotationCurrent * deltaRotationMatrix; 
    } 
}