core/java/android/view/WindowOrientationListener.java

/*
 * Copyright (C) 2008 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *      http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package android.view;

import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.util.Config;
import android.util.Log;

/**
 * A special helper class used by the WindowManager
 *  for receiving notifications from the SensorManager when
 * the orientation of the device has changed.
 * @hide
 */
public abstract class WindowOrientationListener {
    private static final String TAG = "WindowOrientationListener";
    private static final boolean DEBUG = false;
    private static final boolean localLOGV = DEBUG ? Config.LOGD : Config.LOGV;
    private int mOrientation = ORIENTATION_UNKNOWN;
    private SensorManager mSensorManager;
    private boolean mEnabled = false;
    private int mRate;
    private Sensor mSensor;
    private SensorEventListener mSensorEventListener;
    
    /**
     * Returned from onOrientationChanged when the device orientation cannot be determined
     * (typically when the device is in a close to flat position).
     *
     *  @see #onOrientationChanged
     */
    public static final int ORIENTATION_UNKNOWN = -1;
    /*
     * Returned when the device is almost lying flat on a surface
     */
    public static final int ORIENTATION_FLAT = -2;

    /**
     * Creates a new WindowOrientationListener.
     * 
     * @param context for the WindowOrientationListener.
     */
    public WindowOrientationListener(Context context) {
        this(context, SensorManager.SENSOR_DELAY_NORMAL);
    }
    
    /**
     * Creates a new WindowOrientationListener.
     * 
     * @param context for the WindowOrientationListener.
     * @param rate at which sensor events are processed (see also
     * {@link android.hardware.SensorManager SensorManager}). Use the default
     * value of {@link android.hardware.SensorManager#SENSOR_DELAY_NORMAL 
     * SENSOR_DELAY_NORMAL} for simple screen orientation change detection.
     */
    public WindowOrientationListener(Context context, int rate) {
        mSensorManager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
        mRate = rate;
        mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
        if (mSensor != null) {
            // Create listener only if sensors do exist
            mSensorEventListener = new SensorEventListenerImpl();
        }
    }

    /**
     * Enables the WindowOrientationListener so it will monitor the sensor and call
     * {@link #onOrientationChanged} when the device orientation changes.
     */
    public void enable() {
        if (mSensor == null) {
            Log.w(TAG, "Cannot detect sensors. Not enabled");
            return;
        }
        if (mEnabled == false) {
            if (localLOGV) Log.d(TAG, "WindowOrientationListener enabled");
            mSensorManager.registerListener(mSensorEventListener, mSensor, mRate);
            mEnabled = true;
        }
    }

    /**
     * Disables the WindowOrientationListener.
     */
    public void disable() {
        if (mSensor == null) {
            Log.w(TAG, "Cannot detect sensors. Invalid disable");
            return;
        }
        if (mEnabled == true) {
            if (localLOGV) Log.d(TAG, "WindowOrientationListener disabled");
            mSensorManager.unregisterListener(mSensorEventListener);
            mEnabled = false;
        }
    }

    class SensorEventListenerImpl implements SensorEventListener {
        private static final int _DATA_X = 0;
        private static final int _DATA_Y = 1;
        private static final int _DATA_Z = 2;
        
        public void onSensorChanged(SensorEvent event) {
            float[] values = event.values;
            int orientation = ORIENTATION_UNKNOWN;
            float X = values[_DATA_X];
            float Y = values[_DATA_Y];
            float Z = values[_DATA_Z];
            float OneEightyOverPi = 57.29577957855f;
            float gravity = (float) Math.sqrt(X*X+Y*Y+Z*Z);
            float zyangle = Math.abs((float)Math.asin(Z/gravity)*OneEightyOverPi);
            // The device is considered flat if the angle is more than 75
            // if the angle is less than 40, its considered too flat to switch
            // orientation. if the angle is between 40 - 75, the orientation is unknown
            if (zyangle < 40) {
                // Check orientation only if the phone is flat enough
                // Don't trust the angle if the magnitude is small compared to the y value
                float angle = (float)Math.atan2(Y, -X) * OneEightyOverPi;
                orientation = 90 - (int)Math.round(angle);
                // normalize to 0 - 359 range
                while (orientation >= 360) {
                    orientation -= 360;
                } 
                while (orientation < 0) {
                    orientation += 360;
                }
            } else if (zyangle >= 75){
                orientation = ORIENTATION_FLAT;
            }
            
            if (orientation != mOrientation) {
                mOrientation = orientation;
                onOrientationChanged(orientation);
            }
        }

        public void onAccuracyChanged(Sensor sensor, int accuracy) {

        }
    }

    /*
     * Returns true if sensor is enabled and false otherwise
     */
    public boolean canDetectOrientation() {
        return mSensor != null;
    }
    
    /**
     * Called when the orientation of the device has changed.
     * orientation parameter is in degrees, ranging from 0 to 359.
     * orientation is 0 degrees when the device is oriented in its natural position,
     * 90 degrees when its left side is at the top, 180 degrees when it is upside down, 
     * and 270 degrees when its right side is to the top.
     * {@link #ORIENTATION_UNKNOWN} is returned when the device is close to flat
     * and the orientation cannot be determined.
     *
     * @param orientation The new orientation of the device.
     *
     *  @see #ORIENTATION_UNKNOWN
     */
    abstract public void onOrientationChanged(int orientation);
}