How to setboundary for Image View movement

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Mobile

Android

sensors

Hi,

I am working on an app, part of which has a bubble level which I have implemented with the accelerometer sensor. The problem is that there is nothing to limit it's movement, so if I tip the phone too far, the bubble disappears off the screen. The level line (on which the bubble travels up and down on) and the bubble are contained within a relative layout. So I though to get the y coordinate of the top and bottom of the layout, the get the y coordinate of the imageview, then if this coordinate was greater than the bottom of the layout or less than the top then set the image view y coordinate to that view, unfortunately that doesn't seem to work...here is how I've done it below:

@TargetApi(Build.VERSION_CODES.HONEYCOMB)
   @Override
   public void onSensorChanged(SensorEvent event) {

       boolean initialized = false;
       int x;
       double pos;
       if ((this.CurrentApi >= 11) && (event.sensor.getType() == Sensor.TYPE_ACCELEROMETER))
       {
           levelBar.getLocationOnScreen(LevelValues);

           x = LevelValues[0];
           pos = event.values[1]/2.5;

           int[] posXY = new int[2];

           y = (int)Math.pow(pos, 5);
           if ((pos <= -0.5) || (pos >= 0.5)){
               indicator.setImageResource(R.drawable.level_bad);
           }
           else
           {
               indicator.setImageResource(R.drawable.level_good);
           }
           indicator.setTranslationY(-y);

           indicator.getLocationOnScreen(posXY);
           int yPos = posXY[1];

           float maxTemp = (float)levelH.getTop();
           float minTemp = (float)levelH.getBottom();

           max = maxTemp + 20.0f;
           min = minTemp - 20.0f;
           Log.d("Y COORDINATES", Integer.toString(yPos));
           Log.d("MAX", Float.toString(max));
           Log.d("MIN", Float.toString(min));

           if (yPos >= min){
               indicator.setY(min);
           }
           else if (yPos <= max){
              indicator.setY(max);
           }
       }
   }

When the bubble gets to the top or bottom, it flickers and then disappears off screen, could anyone help me with this, I really don't know what to do next.

Any help is greatly appreciated