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/*
* Copyright (C) 2009 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 com.android.incallui;
import android.content.Context;
import android.hardware.Sensor;
import android.hardware.SensorEvent;
import android.hardware.SensorEventListener;
import android.hardware.SensorManager;
import android.os.Handler;
import android.os.Message;
import com.android.dialer.common.LogUtil;
/**
* This class is used to listen to the accelerometer to monitor the orientation of the phone. The
* client of this class is notified when the orientation changes between horizontal and vertical.
*/
public class AccelerometerListener {
// Device orientation
public static final int ORIENTATION_UNKNOWN = 0;
public static final int ORIENTATION_VERTICAL = 1;
public static final int ORIENTATION_HORIZONTAL = 2;
private static final String TAG = "AccelerometerListener";
private static final boolean DEBUG = true;
private static final boolean VDEBUG = false;
private static final int ORIENTATION_CHANGED = 1234;
private static final int VERTICAL_DEBOUNCE = 100;
private static final int HORIZONTAL_DEBOUNCE = 500;
private static final double VERTICAL_ANGLE = 50.0;
private SensorManager sensorManager;
private Sensor sensor;
// mOrientation is the orientation value most recently reported to the client.
private int orientation;
// mPendingOrientation is the latest orientation computed based on the sensor value.
// This is sent to the client after a rebounce delay, at which point it is copied to
// mOrientation.
private int pendingOrientation;
private OrientationListener listener;
Handler handler =
new Handler() {
@Override
public void handleMessage(Message msg) {
switch (msg.what) {
case ORIENTATION_CHANGED:
synchronized (this) {
orientation = pendingOrientation;
if (DEBUG) {
LogUtil.d(
TAG,
"orientation: "
+ (orientation == ORIENTATION_HORIZONTAL
? "horizontal"
: (orientation == ORIENTATION_VERTICAL ? "vertical" : "unknown")));
}
if (listener != null) {
listener.orientationChanged(orientation);
}
}
break;
}
}
};
SensorEventListener sensorListener =
new SensorEventListener() {
@Override
public void onSensorChanged(SensorEvent event) {
onSensorEvent(event.values[0], event.values[1], event.values[2]);
}
@Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
// ignore
}
};
public AccelerometerListener(Context context) {
sensorManager = (SensorManager) context.getSystemService(Context.SENSOR_SERVICE);
sensor = sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER);
}
public void setListener(OrientationListener listener) {
this.listener = listener;
}
public void enable(boolean enable) {
if (DEBUG) {
LogUtil.d(TAG, "enable(" + enable + ")");
}
synchronized (this) {
if (enable) {
orientation = ORIENTATION_UNKNOWN;
pendingOrientation = ORIENTATION_UNKNOWN;
sensorManager.registerListener(sensorListener, sensor, SensorManager.SENSOR_DELAY_NORMAL);
} else {
sensorManager.unregisterListener(sensorListener);
handler.removeMessages(ORIENTATION_CHANGED);
}
}
}
private void setOrientation(int orientation) {
synchronized (this) {
if (pendingOrientation == orientation) {
// Pending orientation has not changed, so do nothing.
return;
}
// Cancel any pending messages.
// We will either start a new timer or cancel alltogether
// if the orientation has not changed.
handler.removeMessages(ORIENTATION_CHANGED);
if (this.orientation != orientation) {
// Set timer to send an event if the orientation has changed since its
// previously reported value.
pendingOrientation = orientation;
final Message m = handler.obtainMessage(ORIENTATION_CHANGED);
// set delay to our debounce timeout
int delay = (orientation == ORIENTATION_VERTICAL ? VERTICAL_DEBOUNCE : HORIZONTAL_DEBOUNCE);
handler.sendMessageDelayed(m, delay);
} else {
// no message is pending
pendingOrientation = ORIENTATION_UNKNOWN;
}
}
}
private void onSensorEvent(double x, double y, double z) {
if (VDEBUG) {
LogUtil.d(TAG, "onSensorEvent(" + x + ", " + y + ", " + z + ")");
}
// If some values are exactly zero, then likely the sensor is not powered up yet.
// ignore these events to avoid false horizontal positives.
if (x == 0.0 || y == 0.0 || z == 0.0) {
return;
}
// magnitude of the acceleration vector projected onto XY plane
final double xy = Math.hypot(x, y);
// compute the vertical angle
double angle = Math.atan2(xy, z);
// convert to degrees
angle = angle * 180.0 / Math.PI;
final int orientation =
(angle > VERTICAL_ANGLE ? ORIENTATION_VERTICAL : ORIENTATION_HORIZONTAL);
if (VDEBUG) {
LogUtil.d(TAG, "angle: " + angle + " orientation: " + orientation);
}
setOrientation(orientation);
}
public interface OrientationListener {
void orientationChanged(int orientation);
}
}
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