AnimatedLayout part 3: add additional const and fields

AnimatedLayout.java

    private float MIN_FLING_START_VELOCITY_DP = 500;

    private float mCurrentMinFlingVelocityPx;
    private VelocityTracker mVelocityTracker;
    private boolean isTouching = false;
    private FlingAnimation mFling = new FlingAnimation(this,
            new FloatPropertyCompat<AnimatedLayout>("offset") {

                @Override
                public float getValue(AnimatedLayout object) {
                    return object.getOffset();

                }

                @Override
                public void setValue(AnimatedLayout object, float value) {
                    object.updateOffset(value);
                    object.invalidate();
                }
            });

    private float getOffset() {
        return mOffsetValue;
    }

    protected void onSizeChanged(int w, int h, int oldw, int oldh) {
        ...
        mCurrentMinFlingVelocityPx = convertDpToPixel(MIN_FLING_START_VELOCITY_DP, getContext());
    ...
   
   private static float convertDpToPixel(float valueDp, Context context) {
        DisplayMetrics displayMetrics = context.getResources().getDisplayMetrics();
        return TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, valueDp,
                displayMetrics);
   }