The correct way to use ONLY the gyroscope and accelerometer to obtain a reliable current angle on any axis on ANDROID

Question

A week ago, I did not know anything about Android Motion Sensors. Having learned an amazing thing called "Virtual Reality", I started looking for what sensors are used to obtain these results. Than I had an idea for APP, but I still don’t know which sensors I should use for the situation below:

I need to get the orientation of the phone in relation to myself. I mean, I have to be able to isolate each axis in degradation. Something like that:

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Answer 1

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float[] mGravity;
float[] mGeomagnetic;


    float[] temp = new float[9];
    float[] RR = new float[9];
    //Load rotation matrix into R
    SensorManager.getRotationMatrix(temp, null,
            mGravity, mGeomagnetic);

    //Remap to camera point-of-view
    SensorManager.remapCoordinateSystem(temp,
            SensorManager.AXIS_X,
            SensorManager.AXIS_Z, RR);

    //Return the orientation values
    float[] values = new float[3];
    SensorManager.getOrientation(RR, values);

    Double degrees = (values[2] * 180) / Math.PI;