Android Open Source - android-rotation-sensor-sample Orientation

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License

The source code is released under:

Copyright (c) 2013 Keith Platfoot Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Sof...

Java Source Code

package com.kviation.android.sample.orientation;
//from  ww  w .  ja va2s  .  com
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.view.Surface;
import android.view.WindowManager;

public class Orientation implements SensorEventListener {

  public interface Listener {
    void onOrientationChanged(float pitch, float roll);
  }

  private static final int SENSOR_DELAY_MICROS = 50 * 1000; // 50ms

  private final SensorManager mSensorManager;
  private final Sensor mRotationSensor;
  private final WindowManager mWindowManager;

  private int mLastAccuracy;
  private Listener mListener;

  public Orientation(SensorManager sensorManager, WindowManager windowManager) {
    mSensorManager = sensorManager;
    mWindowManager = windowManager;

    // Can be null if the sensor hardware is not available
    mRotationSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR);
  }

  public void startListening(Listener listener) {
    if (mListener == listener) {
      return;
    }
    mListener = listener;
    if (mRotationSensor == null) {
      Log.w("Rotation vector sensor not available; will not provide orientation data.");
      return;
    }
    mSensorManager.registerListener(this, mRotationSensor, SENSOR_DELAY_MICROS);
  }

  public void stopListening() {
    mSensorManager.unregisterListener(this);
    mListener = null;
  }

  @Override
  public void onAccuracyChanged(Sensor sensor, int accuracy) {
    if (mLastAccuracy != accuracy) {
      mLastAccuracy = accuracy;
    }
  }

  @Override
  public void onSensorChanged(SensorEvent event) {
    if (mListener == null) {
      return;
    }
    if (mLastAccuracy == SensorManager.SENSOR_STATUS_UNRELIABLE) {
      return;
    }
    if (event.sensor == mRotationSensor) {
      updateOrientation(event.values);
    }
  }

  private void updateOrientation(float[] rotationVector) {
    float[] rotationMatrix = new float[9];
    SensorManager.getRotationMatrixFromVector(rotationMatrix, rotationVector);

    // By default, remap the axes as if the front of the
    // device screen was the instrument panel.
    int worldAxisForDeviceAxisX = SensorManager.AXIS_X;
    int worldAxisForDeviceAxisY = SensorManager.AXIS_Z;

    // Adjust the rotation matrix for the device orientation
    int screenRotation = mWindowManager.getDefaultDisplay().getRotation();
    if (screenRotation == Surface.ROTATION_0) {
      worldAxisForDeviceAxisX = SensorManager.AXIS_X;
      worldAxisForDeviceAxisY = SensorManager.AXIS_Z;
    } else if (screenRotation == Surface.ROTATION_90) {
      worldAxisForDeviceAxisX = SensorManager.AXIS_Z;
      worldAxisForDeviceAxisY = SensorManager.AXIS_MINUS_X;
    } else if (screenRotation == Surface.ROTATION_180) {
      worldAxisForDeviceAxisX = SensorManager.AXIS_MINUS_X;
      worldAxisForDeviceAxisY = SensorManager.AXIS_MINUS_Z;
    } else if (screenRotation == Surface.ROTATION_270) {
      worldAxisForDeviceAxisX = SensorManager.AXIS_MINUS_Z;
      worldAxisForDeviceAxisY = SensorManager.AXIS_X;
    }

    float[] adjustedRotationMatrix = new float[9];
    SensorManager.remapCoordinateSystem(rotationMatrix, worldAxisForDeviceAxisX,
        worldAxisForDeviceAxisY, adjustedRotationMatrix);

    // Transform rotation matrix into azimuth/pitch/roll
    float[] orientation = new float[3];
    SensorManager.getOrientation(adjustedRotationMatrix, orientation);

    // Convert radians to degrees
    float pitch = orientation[1] * -57;
    float roll = orientation[2] * -57;

    mListener.onOrientationChanged(pitch, roll);
  }
}

Java Source Code List

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