SharedPreferences in public class - can't find value - android-activity

Question

I've been struggling to find the solution to loading some SharedPreferences values into SensorEventListener. I keep on getting blank values, null or it just crashes from example code that I found on Stackoverflow.
Here are a few of my references:
Android - How to use SharedPreferences in non-Activity class?
Android: Using SharedPreferences in a Shake Listener Class
Here is the Shake Detection code from below:
Android: I want to shake it
I'm getting these values not from a different activity, and I'd like to load them from SharedPreferences into the public class ShakeEventListener and change the static values for MIN_FORCE, MIN_DIRECTION_CHANGE and MAX_TOTAL_DURATION_OF_SHAKE to the SharedPreferences values based on the stored values.
Example of my SharedPerferences code from Motion.java:
SharedPerferences for value: MIN_FORCE
SharedPreferences spa = getSharedPreferences("ForceStore", Activity.MODE_PRIVATE);
int ValueForce = spa.getInt("Force", 15);
SharedPerferences for value: MIN_DIRECTION_CHANGE
SharedPreferences spb = getSharedPreferences("DirectionStore", MODE_PRIVATE);
int ValueDirection = spb.getInt("Direction", 2);
SharedPerferences for value: MAX_TOTAL_DURATION_OF_SHAKE
SharedPreferences spc = getSharedPreferences("ShakeStore", MODE_PRIVATE);
int ValueShake = spc.getInt("Shake", 200);
Example code from MainActivity.java:
((ShakeEventListener) mSensorListener).setOnShakeListener(new ShakeEventListener.OnShakeListener() {
public void onShake() {
// My code here to react to the Motion detected
}
}
});
}
Example code of public class ShakeEventListener:
public class ShakeEventListener implements SensorEventListener {
private static final int MIN_FORCE = 15;
private static final int MIN_DIRECTION_CHANGE = 2;
/** Maximum pause between movements. */
private static final int MAX_PAUSE_BETHWEEN_DIRECTION_CHANGE = 200;
/** Maximum allowed time for shake gesture. */
private static final int MAX_TOTAL_DURATION_OF_SHAKE = 200;
/** Time when the gesture started. */
private long mFirstDirectionChangeTime = 0;
/** Time when the last movement started. */
private long mLastDirectionChangeTime;
/** How many movements are considered so far. */
private int mDirectionChangeCount = 0;
/** The last x position. */
private float lastX = 0;
/** The last y position. */
private float lastY = 0;
/** The last z position. */
private float lastZ = 0;
/** OnShakeListener that is called when shake is detected. */
private OnShakeListener mShakeListener;
public interface OnShakeListener {
void onShake();
}
public void setOnShakeListener(OnShakeListener listener) {
mShakeListener = listener;
}
#Override
public void onSensorChanged(SensorEvent se) {
// get sensor data
//float x = se.values[0];
//float y = se.values[1];
float z = se.values[2];
// calculate movement
//float totalMovement = Math.abs(x + y + z - lastX - lastY - lastZ);
float totalMovement = Math.abs(z - lastZ);
if (totalMovement > MIN_FORCE) {
// get time
long now = System.currentTimeMillis();
// store first movement time
if (mFirstDirectionChangeTime == 0) {
mFirstDirectionChangeTime = now;
mLastDirectionChangeTime = now;
}
// check if the last movement was not long ago
long lastChangeWasAgo = now - mLastDirectionChangeTime;
if (lastChangeWasAgo < MAX_PAUSE_BETHWEEN_DIRECTION_CHANGE) {
// store movement data
mLastDirectionChangeTime = now;
mDirectionChangeCount++;
// store last sensor data
//lastX = x;
//lastY = y;
lastZ = z;
// check how many movements are so far
if (mDirectionChangeCount >= MIN_DIRECTION_CHANGE) {
// check total duration
long totalDuration = now - mFirstDirectionChangeTime;
if (totalDuration < MAX_TOTAL_DURATION_OF_SHAKE) {
mShakeListener.onShake();
resetShakeParameters();
}
}
} else {
resetShakeParameters();
}
}
}
private void resetShakeParameters() {
mFirstDirectionChangeTime = 0;
mDirectionChangeCount = 0;
mLastDirectionChangeTime = 0;
// lastX = 0;
// lastY = 0;
lastZ = 0;
}
#Override
public void onAccuracyChanged(Sensor sensor, int accuracy) {
}
}