How to collect data from multiple mobile sensors at once in Java?

Question

I want to collect data from the accelerometer, gyroscope and magnetometer all at once. I am currently using the SensorManager service which is based on the SensorEvent. The problem with this is that I can only get the data from 1 sensor at a given point in time. So in time t1 I am getting data from accelerator, in t2 I am getting data from gyroscope and in t3 i am getting data from magnetometer.

My code is as follows:

public void onSensorChanged(SensorEvent event) {
    if(event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
        sText.setText("S: " + event.sensor.getStringType());
    }
    else if (event.sensor.getType() == Sensor.TYPE_GYROSCOPE){
        sText.setText("S: " + event.sensor.getStringType());
    } 
    else if(event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD){
        sText.setText("S: " + event.sensor.getStringType());
    }
}

Instead of having to work with the three sensors at 3 different times, I want to be able to collect the data from all sensors in one time interval. Is this possible?

Answer 1

A little late, but may be useful for others - you can use simple workaround:

select sensors with highest update frequency and "synchronize" all other sensors data with them via global variables. E.g. (for accelerometer as main sensor):

...
float mAccX;
float mAccY;
float mAccZ;

float mGyroX;
float mGyroY;
float mGyroZ;

float mMagX;
float mMagY;
float mMagZ;

...

public void onSensorChanged(SensorEvent event) {
    if(event.sensor.getType() == Sensor.TYPE_ACCELEROMETER){
        sText.setText("S: " + event.sensor.getStringType());
        mAccX = event.values[0];
        mAccY = event.values[1];
        mAccZ = event.values[2]; 
        
        // use all sensors data here
        processAllSensorsData(mAccX, mAccY, mAccZ, 
                              mGyroX, mGyroY, mGyroZ,
                              mMagX, mMagY, mMagZ);
    }
    else if (event.sensor.getType() == Sensor.TYPE_GYROSCOPE){
        sText.setText("S: " + event.sensor.getStringType());
        mGyroX = event.values[0];
        mGyroY = event.values[1];
        mGyroZ = event.values[2]; 
    } 
    else if(event.sensor.getType() == Sensor.TYPE_MAGNETIC_FIELD){
        sText.setText("S: " + event.sensor.getStringType());
        mMagX = event.values[0];
        mMagY = event.values[1];
        mMagZ = event.values[2];
    }
}

Or use some kind of interpolation (linear of quadratic), but in that case you get current sensors values with some delay.

And also use separate SensorEventListener for each sensor.