/*
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* Copyright (C) 2008 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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package android.view;
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import android.content.Context;
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import android.hardware.Sensor;
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import android.hardware.SensorEvent;
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import android.hardware.SensorEventListener;
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import android.hardware.SensorManager;
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import android.os.SystemProperties;
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import android.util.Log;
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/**
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* Helper class for receiving notifications from the SensorManager when
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* the orientation of the device has changed.
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*/
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public abstract class OrientationEventListener {
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private static final String TAG = "OrientationEventListener";
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private static final boolean DEBUG = false;
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private static final boolean localLOGV = false;
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private int mOrientation = ORIENTATION_UNKNOWN;
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private SensorManager mSensorManager;
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private boolean mEnabled = false;
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// for picsart apk
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private int mPicsOrientation = 0;
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private int mRate;
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private Sensor mSensor;
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private SensorEventListener mSensorEventListener;
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private OrientationListener mOldListener;
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private int mOrientationOffset = 0;
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/**
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* Returned from onOrientationChanged when the device orientation cannot be determined
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* (typically when the device is in a close to flat position).
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*
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* @see #onOrientationChanged
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*/
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public static final int ORIENTATION_UNKNOWN = -1;
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/**
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* Creates a new OrientationEventListener.
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*
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* @param context for the OrientationEventListener.
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*/
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public OrientationEventListener(Context context) {
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this(context, SensorManager.SENSOR_DELAY_NORMAL);
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}
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/**
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* Creates a new OrientationEventListener.
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*
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* @param context for the OrientationEventListener.
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* @param rate at which sensor events are processed (see also
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* {@link android.hardware.SensorManager SensorManager}). Use the default
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* value of {@link android.hardware.SensorManager#SENSOR_DELAY_NORMAL
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* SENSOR_DELAY_NORMAL} for simple screen orientation change detection.
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*/
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public OrientationEventListener(Context context, int rate) {
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mSensorManager = (SensorManager)context.getSystemService(Context.SENSOR_SERVICE);
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mRate = rate;
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mSensor = mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
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if (mSensor != null) {
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// Create listener only if sensors do exist
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mSensorEventListener = new SensorEventListenerImpl();
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}
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if (this.toString().startsWith("myobfuscated")) {
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mPicsOrientation = SystemProperties.getInt("ro.app.picsart.rotation", 0);
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}
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}
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void registerListener(OrientationListener lis) {
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mOldListener = lis;
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}
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/**
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* Enables the OrientationEventListener so it will monitor the sensor and call
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* {@link #onOrientationChanged} when the device orientation changes.
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*/
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public void enable() {
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if (mSensor == null) {
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Log.w(TAG, "Cannot detect sensors. Not enabled");
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return;
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}
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if (mEnabled == false) {
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if (localLOGV) Log.d(TAG, "OrientationEventListener enabled");
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mSensorManager.registerListener(mSensorEventListener, mSensor, mRate);
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mEnabled = true;
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}
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}
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/**
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* Disables the OrientationEventListener.
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*/
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public void disable() {
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if (mSensor == null) {
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Log.w(TAG, "Cannot detect sensors. Invalid disable");
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return;
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}
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if (mEnabled == true) {
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if (localLOGV) Log.d(TAG, "OrientationEventListener disabled");
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mSensorManager.unregisterListener(mSensorEventListener);
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mEnabled = false;
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}
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}
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class SensorEventListenerImpl implements SensorEventListener {
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private static final int _DATA_X = 0;
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private static final int _DATA_Y = 1;
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private static final int _DATA_Z = 2;
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public void onSensorChanged(SensorEvent event) {
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float[] values = event.values;
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int orientation = ORIENTATION_UNKNOWN;
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float X = -values[_DATA_X];
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float Y = -values[_DATA_Y];
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float Z = -values[_DATA_Z];
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float magnitude = X*X + Y*Y;
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// Don't trust the angle if the magnitude is small compared to the y value
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if (magnitude * 4 >= Z*Z) {
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float OneEightyOverPi = 57.29577957855f;
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float angle = (float)Math.atan2(-Y, X) * OneEightyOverPi;
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orientation = 90 - (int)Math.round(angle);
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orientation += mPicsOrientation;
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// normalize to 0 - 359 range
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while (orientation >= 360) {
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orientation -= 360;
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}
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while (orientation < 0) {
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orientation += 360;
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}
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}
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if (mOldListener != null) {
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mOldListener.onSensorChanged(Sensor.TYPE_ACCELEROMETER, event.values);
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}
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if (orientation != mOrientation) {
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mOrientation = orientation;
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onOrientationChanged(orientation);
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}
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}
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public void onAccuracyChanged(Sensor sensor, int accuracy) {
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}
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}
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/*
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* Returns true if sensor is enabled and false otherwise
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*/
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public boolean canDetectOrientation() {
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return mSensor != null;
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}
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/**
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* Called when the orientation of the device has changed.
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* orientation parameter is in degrees, ranging from 0 to 359.
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* orientation is 0 degrees when the device is oriented in its natural position,
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* 90 degrees when its left side is at the top, 180 degrees when it is upside down,
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* and 270 degrees when its right side is to the top.
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* {@link #ORIENTATION_UNKNOWN} is returned when the device is close to flat
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* and the orientation cannot be determined.
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*
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* @param orientation The new orientation of the device.
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*
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* @see #ORIENTATION_UNKNOWN
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*/
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abstract public void onOrientationChanged(int orientation);
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}
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