Textview folgt nicht Seekbar Thumb

Ich baue eine App, in der ich einen Arc SeekBar habe, und ich versuche, die TextView zu folgen SeekBar thumb.Textview folgt nicht Seekbar Thumb

Mein Code:

seekBar = (ArcSeekBar)findViewById(R.id.seekArc); 
     textView = (TextView)findViewById(R.id.myText); 
     seekBar.setOnSeekArcChangeListener(new ArcSeekBar.OnSeekArcChangeListener() { 
      @Override 
      public void onProgressChanged(ArcSeekBar seekArc, int progress, boolean fromUser) { 
       int x = seekBar.getmTranslateX() - seekBar.getmThumbXPos()-100; 
       int y = seekBar.getmTranslateY() - seekBar.getmThumbYPos()-100; 

       textView.setX(x); 
       textView.setY(y); 
       textView.setText(String.valueOf(progress)); 
      } 

      @Override 
      public void onStartTrackingTouch(ArcSeekBar seekArc) { 

      } 

      @Override 
      public void onStopTrackingTouch(ArcSeekBar seekArc) { 

      } 
     });

Und wie i meeassure die seekbar X- und Y-Positionen.

@Override 
    protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) { 

     final int height = getDefaultSize(getSuggestedMinimumHeight(), 
       heightMeasureSpec); 
     final int width = getDefaultSize(getSuggestedMinimumWidth(), 
       widthMeasureSpec); 
     final int min = Math.min(width, height); 
     float top = 0; 
     float left = 0; 
     int arcDiameter = 0; 

     mTranslateX = (int) (width * 0.5f); 
     mTranslateY = (int) (height * 0.5f); 

     arcDiameter = min - getPaddingLeft(); 
     mArcRadius = arcDiameter/2; 
     top = height/2 - (arcDiameter/2); 
     left = width/2 - (arcDiameter/2); 
     mArcRect.set(left, top, left + arcDiameter, top + arcDiameter); 

     int arcStart = (int) mProgressSweep + mStartAngle + mRotation + 90; 
     mThumbXPos = (int) (mArcRadius * Math.cos(Math.toRadians(arcStart))); 
     mThumbYPos = (int) (mArcRadius * Math.sin(Math.toRadians(arcStart))); 

     setTouchInSide(mTouchInside); 
     super.onMeasure(widthMeasureSpec, heightMeasureSpec); 
    }

Das Ergebnis ist: