android - How to get TYPE_ROTATION_VECTOR sensor data on Galaxy Watch7 - Stack Overflow

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I try to develop Android app where I need get watch orientation with max possible frequency. I discover issue with getting TYPE_ROTATION_VECTOR sensor data on Galaxy Watch 7. if I register sensor listener with SensorManager.SENSOR_DELAY_FASTEST, looks like on that watch sensor repeat/skip approximately 4-6 sensors reading. Example bellow:

Data on items 1-6 is the same:
0 = {quaternion@28060} "x:-0.862837 y:-0.214272 z:0.447439 w:0.096935"
1 = {quaternion@28061} "x:-0.894187 y:-0.162952 z:0.385226 w:0.159612"
2 = {quaternion@28062} "x:-0.894187 y:-0.162952 z:0.385226 w:0.159612"
3 = {quaternion@28063} "x:-0.894187 y:-0.162952 z:0.385226 w:0.159612"
4 = {quaternion@28064} "x:-0.894187 y:-0.162952 z:0.385226 w:0.159612"
5 = {quaternion@28065} "x:-0.894187 y:-0.162952 z:0.385226 w:0.159612"
6 = {quaternion@28066} "x:-0.894187 y:-0.162952 z:0.385226 w:0.159612"
7 = {quaternion@28067} "x:-0.920170 y:-0.108727 z:0.282975 w:0.247769"
8 = {quaternion@28068} "x:-0.920170 y:-0.108727 z:0.282975 w:0.247769"

...

Looks like Galaxy Watch 4 work just fine. Same Wear OS version, same System version, same code running.

Below is simple app Activity that can produce logs that will show difference between Watch 4 and Watch 7.

    package com.example.orientationtest;

    import android.hardware.Sensor;
    import android.hardware.SensorEvent;
    import android.hardware.SensorEventListener;
    import android.hardware.SensorManager;
    import android.os.Bundle;
    import android.app.Activity;
    import android.util.Log;

    public class MainActivity extends Activity implements SensorEventListener {

        private SensorManager sensorManager;
        private Sensor rotationSensor;
        private int lastAccuracy;

        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
            sensorManager = (SensorManager) this.getSystemService(Activity.SENSOR_SERVICE);
            rotationSensor = sensorManager.getDefaultSensor(Sensor.TYPE_ROTATION_VECTOR);
        }

        @Override
        protected void onStart() {
            super.onStart();
            sensorManager.registerListener(this, rotationSensor, SensorManager.SENSOR_DELAY_FASTEST);
        }

    @Override
    protected void onStop() {
        super.onStop();
        sensorManager.unregisterListener(this);
    }

        @Override
        public void onSensorChanged(SensorEvent event) {

            if (lastAccuracy == SensorManager.SENSOR_STATUS_UNRELIABLE) {
                return;
            }

            if (event.sensor == rotationSensor) {
                float[] quaternion = new float[4];
                SensorManager.getQuaternionFromVector(quaternion, event.values);
                Log.i("SensorData", "quaternion: x = " + quaternion[1] + " y = " + quaternion[2] + " z = " + quaternion[3] + " w = " + quaternion[0]);
            }
        }

        @Override
        public void onAccuracyChanged(Sensor sensor, int accuracy) {
            Log.d("SensorData", "Accuracy: " + accuracy);
            if (lastAccuracy != accuracy) {
                lastAccuracy = accuracy;
            }
       }
    }

Watch 7 logs:

• quaternion: x = 0.16676 y = 0.225229 z = 0.697442 w = 0.659572
• quaternion: x = 0.16676 y = 0.225229 z = 0.697442 w = 0.659572
• quaternion: x = 0.16676 y = 0.225229 z = 0.697442 w = 0.659572
• quaternion: x = 0.16676 y = 0.225229 z = 0.697442 w = 0.659572
• quaternion: x = 0.16676 y = 0.225229 z = 0.697442 w = 0.659572
• quaternion: x = 0.16676 y = 0.225229 z = 0.697442 w = 0.659572
• quaternion: x = 0.166636 y = 0.225591 z = 0.697355 w = 0.659573
• quaternion: x = 0.166636 y = 0.225591 z = 0.697355 w = 0.659573
• quaternion: x = 0.166636 y = 0.225591 z = 0.697355 w = 0.659573
• quaternion: x = 0.166636 y = 0.225591 z = 0.697355 w = 0.659573
• quaternion: x = 0.166636 y = 0.225591 z = 0.697355 w = 0.659573
• quaternion: x = 0.166636 y = 0.225591 z = 0.697355 w = 0.659573
• quaternion: x = 0.166474 y = 0.22601 z = 0.697112 w = 0.659726
• quaternion: x = 0.166474 y = 0.22601 z = 0.697112 w = 0.659726
• quaternion: x = 0.166474 y = 0.22601 z = 0.697112 w = 0.659726
• quaternion: x = 0.166474 y = 0.22601 z = 0.697112 w = 0.659726
• quaternion: x = 0.166032 y = 0.225805 z = 0.697044 w = 0.65998
• quaternion: x = 0.166032 y = 0.225805 z = 0.697044 w = 0.65998
• quaternion: x = 0.166032 y = 0.225805 z = 0.697044 w = 0.65998
• quaternion: x = 0.166032 y = 0.225805 z = 0.697044 w = 0.65998

Watch 4 logs

• quaternion: x = -0.016336 y = -0.015928 z = 0.10495 w = 0.994215

• quaternion: x = -0.016307 y = -0.015926 z = 0.104955 w = 0.994215

• quaternion: x = -0.016336 y = -0.01596 z = 0.104954 w = 0.994214

• quaternion: x = -0.016512 y = -0.016046 z = 0.104955 w = 0.99421

• quaternion: x = -0.016515 y = -0.016074 z = 0.104961 w = 0.994209

• quaternion: x = -0.0166 y = -0.016146 z = 0.104967 w = 0.994206

• quaternion: x = -0.016616 y = -0.016161 z = 0.104973 w = 0.994204

• quaternion: x = -0.01681 y = -0.016191 z = 0.104975 w = 0.9942

• quaternion: x = -0.016833 y = -0.016199 z = 0.104975 w = 0.9942

• quaternion: x = -0.016939 y = -0.016223 z = 0.10497 w = 0.994198

• quaternion: x = -0.017149 y = -0.016287 z = 0.104972 w = 0.994193

• quaternion: x = -0.017249 y = -0.016333 z = 0.104972 w = 0.994191

• quaternion: x = -0.01729 y = -0.016378 z = 0.104972 w = 0.994189

• quaternion: x = -0.017333 y = -0.016451 z = 0.104971 w = 0.994188

  Since API 26 SensorDirectChannel is available to use for possible faster sample rates. It can be used with MemoryFile or HardwareBuffer as Buffer. I get IOExceptions with both while trying to create the Channel. I wounder if anyone can share info about success of using SensorDirectChannel.

  Thank you for any help.

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