VirtualIJaxActivity.java

package com.google.mcommerce.sample.android.chapter08.sensor;

import android.app.Activity;
import android.content.Intent;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.net.Uri;
import android.os.Build;
import android.os.Bundle;
import android.view.View;
import android.view.WindowManager;
import android.widget.TextView;

import com.google.mcommerce.sample.android.R;

public class VirtualIJaxActivity extends Activity implements
		SensorEventListener {
	private static final String TAG = "VirtualJax";
	private SensorManager mgr;
	private Sensor accel;
	private Sensor compass;
	private Sensor orient;
	private TextView preferred;
	private TextView orientation;
	private int ready = 0;
	private float[] accelValues = new float[3];
	private float[] compassValues = new float[3];
	private float[] inR = new float[9];
	private float[] inclineMatrix = new float[9];
	private float[] orientationValues = new float[3];
	private float[] prefValues = new float[3];
	private float mAzimuth;
	private double mInclination;
	private int counter;
	private int mRotation;

	@Override
	public void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.c08_sensor_virtua_jax);

		preferred = (TextView) findViewById(R.id.preferred);
		orientation = (TextView) findViewById(R.id.orientation);

		mgr = (SensorManager) this.getSystemService(SENSOR_SERVICE);

		accel = mgr.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
		compass = mgr.getDefaultSensor(Sensor.TYPE_MAGNETIC_FIELD);
		orient = mgr.getDefaultSensor(Sensor.TYPE_ORIENTATION);

		WindowManager window = (WindowManager) this
				.getSystemService(WINDOW_SERVICE);
		int apiLevel = Integer.parseInt(Build.VERSION.SDK);
		if (apiLevel < 8) {
			mRotation = window.getDefaultDisplay().getOrientation();
		} else {
			mRotation = window.getDefaultDisplay().getRotation();
		}
	}

	@Override
	protected void onResume() {
		mgr.registerListener(this, accel, SensorManager.SENSOR_DELAY_GAME);
		mgr.registerListener(this, compass, SensorManager.SENSOR_DELAY_GAME);
		mgr.registerListener(this, orient, SensorManager.SENSOR_DELAY_GAME);
		super.onResume();
	}

	@Override
	protected void onPause() {
		mgr.unregisterListener(this, accel);
		mgr.unregisterListener(this, compass);
		mgr.unregisterListener(this, orient);
		super.onPause();
	}

	public void onAccuracyChanged(Sensor sensor, int accuracy) {
		// ignore
	}

	public void onSensorChanged(SensorEvent event) {
		// Need to get both accelerometer and compass
		// before we can determine our orientationValues
		switch (event.sensor.getType()) {
		case Sensor.TYPE_ACCELEROMETER:
			for (int i = 0; i < 3; i++) {
				accelValues[i] = event.values[i];
			}
			if (compassValues[0] != 0)
				ready = ready | 1;
			break;
		case Sensor.TYPE_MAGNETIC_FIELD:
			for (int i = 0; i < 3; i++) {
				compassValues[i] = event.values[i];
			}
			if (accelValues[2] != 0)
				ready = ready | 2;
			break;
		case Sensor.TYPE_ORIENTATION:
			for (int i = 0; i < 3; i++) {
				orientationValues[i] = event.values[i];
			}
			break;
		}

		if (ready != 3)
			return;

		if (SensorManager.getRotationMatrix(inR, inclineMatrix, accelValues,
				compassValues)) {
			// got a good rotation matrix

			mInclination = SensorManager.getInclination(inclineMatrix);

			SensorManager.getOrientation(inR, prefValues);

			// Display every 10th value
			if (counter++ % 10 == 0) {
				doUpdate(null);
				counter = 1;
			}
		}
	}

	public void doUpdate(View view) {
		if (ready != 3)
			return;

		mAzimuth = (float) Math.toDegrees(prefValues[0]);
		if (mAzimuth < 0) {
			mAzimuth += 360.0f;
		}

		String msg = String
				.format("Preferred:\nazimuth (Z): %7.3f \npitch (X): %7.3f\nroll (Y): %7.3f",
						mAzimuth, Math.toDegrees(prefValues[1]),
						Math.toDegrees(prefValues[2]));
		preferred.setText(msg);

		msg = String
				.format("Orientation Sensor:\nazimuth (Z): %7.3f\npitch (X): %7.3f\nroll (Y): %7.3f",
						orientationValues[0], orientationValues[1],
						orientationValues[2]);
		orientation.setText(msg);

		preferred.invalidate();
		orientation.invalidate();
	}

	public void doShow(View view) {
		// google.streetview:cbll=30.32454,-81.6584&cbp=1,yaw,,pitch,1.0
		// yaw = degrees clockwise from North
		// For yaw we can use either mAzimuth or orientationValues[0].
		//
		// pitch = degrees up or down. -90 is looking straight up,
		// +90 is looking straight down
		// except that pitch doesn't work properly
		Intent intent = new Intent(Intent.ACTION_VIEW,
				Uri.parse("google.streetview:cbll=30.32454,-81.6584&cbp=1,"
						+ Math.round(orientationValues[0]) + ",,0,1.0"));
		startActivity(intent);
		return;
	}
}