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Commit d03b7ff9 authored by Keith Mok's avatar Keith Mok
Browse files

DeskClock: Use accelerometer instead of orientation sensor 

Orientation sensor is deprecated, and usually it requires
devices to have magnetic sensor for orientation sensor
to be available. For flip action, we can just use accelerometer
instead. Solve the problem that flip to action is not available
for device without a magnetic sensor.

FEIJ-539

Change-Id: I716bf5d43a4042bc4da5d8e68126f52974fb1e7d
parent 9ab924f0

src/com/android/deskclock/SettingsActivity.java

+1 −2
Original line number Diff line number Diff line
@@ -249,8 +249,7 @@ public class SettingsActivity extends BaseActivity { 


            final ListPreference flipActionPref = (ListPreference) findPreference(KEY_FLIP_ACTION);

            if (flipActionPref != null) {

                List<Sensor> sensorList = sensorManager.getSensorList(Sensor.TYPE_ORIENTATION);

                if (sensorList.size() < 1) { // This will be true if no orientation sensor

                if (sensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER) == null) {

                    flipActionPref.setValue("0"); // Turn it off

                    PreferenceCategory category = (PreferenceCategory) findPreference(KEY_ALARM_SETTINGS);

                    if (category != null) {

src/com/android/deskclock/alarms/AlarmService.java

+46 −33
Original line number Diff line number Diff line
@@ -332,15 +332,18 @@ public class AlarmService extends Service { 
        }

    }



    private final SensorEventListener mFlipListener = new SensorEventListener() {

        private static final int FACE_UP_LOWER_LIMIT = -45;

        private static final int FACE_UP_UPPER_LIMIT = 45;

        private static final int FACE_DOWN_UPPER_LIMIT = 135;

        private static final int FACE_DOWN_LOWER_LIMIT = -135;

        private static final int TILT_UPPER_LIMIT = 45;

        private static final int TILT_LOWER_LIMIT = -45;

    private interface ResettableSensorEventListener extends SensorEventListener {

        public void reset();

    }



    private final ResettableSensorEventListener mFlipListener =

        new ResettableSensorEventListener() {

        // Accelerometers are not quite accurate.

        private static final float GRAVITY_UPPER_THRESHOLD = 1.3f * SensorManager.STANDARD_GRAVITY;

        private static final float GRAVITY_LOWER_THRESHOLD = 0.7f * SensorManager.STANDARD_GRAVITY;

        private static final int SENSOR_SAMPLES = 3;



        private boolean mStopped;

        private boolean mWasFaceUp;

        private boolean[] mSamples = new boolean[SENSOR_SAMPLES];

        private int mSampleIndex;
@@ -349,45 +352,54 @@ public class AlarmService extends Service { 
        public void onAccuracyChanged(Sensor sensor, int acc) {

        }



        @Override

        public void reset() {

            mWasFaceUp = false;

            mStopped = false;

            for (int i = 0; i < SENSOR_SAMPLES; i++) {

                mSamples[i] = false;

            }

        }



        private boolean filterSamples() {

            boolean allPass = true;

            for (boolean sample : mSamples) {

                allPass = allPass && sample;

            }

            return allPass;

        }



        @Override

        public void onSensorChanged(SensorEvent event) {

            // Add a sample overwriting the oldest one. Several samples

            // are used

            // to avoid the erroneous values the sensor sometimes

            // are used to avoid the erroneous values the sensor sometimes

            // returns.

            float y = event.values[1];

            float z = event.values[2];



            if (mStopped) {

                return;

            }



            if (!mWasFaceUp) {

                // Check if its face up enough.

                mSamples[mSampleIndex] = y > FACE_UP_LOWER_LIMIT

                        && y < FACE_UP_UPPER_LIMIT

                        && z > TILT_LOWER_LIMIT && z < TILT_UPPER_LIMIT;

                mSamples[mSampleIndex] = (z > GRAVITY_LOWER_THRESHOLD) &&

                    (z < GRAVITY_UPPER_THRESHOLD);



                // The device first needs to be face up.

                boolean faceUp = true;

                for (boolean sample : mSamples) {

                    faceUp = faceUp && sample;

                }

                if (faceUp) {

                // face up

                if (filterSamples()) {

                    mWasFaceUp = true;

                    for (int i = 0; i < SENSOR_SAMPLES; i++) {

                        mSamples[i] = false;

                    }

                }

            } else {

                // Check if its face down enough. Note that wanted

                // values go from FACE_DOWN_UPPER_LIMIT to 180

                // and from -180 to FACE_DOWN_LOWER_LIMIT

                mSamples[mSampleIndex] = (y > FACE_DOWN_UPPER_LIMIT || y < FACE_DOWN_LOWER_LIMIT)

                        && z > TILT_LOWER_LIMIT

                        && z < TILT_UPPER_LIMIT;



                boolean faceDown = true;

                for (boolean sample : mSamples) {

                    faceDown = faceDown && sample;

                }

                if (faceDown) {

                // Check if its face down enough.

                mSamples[mSampleIndex] = (z < -GRAVITY_LOWER_THRESHOLD) &&

                    (z > -GRAVITY_UPPER_THRESHOLD);



                // face down

                if (filterSamples()) {

                    mStopped = true;

                    handleAction(mFlipAction);

                }

            }
@@ -433,8 +445,9 @@ public class AlarmService extends Service { 


    private void attachListeners() {

        if (mFlipAction != ALARM_NO_ACTION) {

            mFlipListener.reset();

            mSensorManager.registerListener(mFlipListener,

                    mSensorManager.getDefaultSensor(Sensor.TYPE_ORIENTATION),

                    mSensorManager.getDefaultSensor(Sensor.TYPE_ACCELEROMETER),

                    SensorManager.SENSOR_DELAY_NORMAL,

                    300 * 1000); //batch every 300 milliseconds

        }