@Override
protected void onDraw(Canvas canvas) {
super.onDraw(canvas);
if (mViewPager == null) {
return;
}
final int count = mViewPager.getAdapter().getCount();
if (count == 0) {
return;
}
if (mCurrentPage >= count) {
setCurrentItem(count - 1);
return;
}
final int paddingLeft = getPaddingLeft();
final float pageWidth = (getWidth() - paddingLeft - getPaddingRight()) / (1f * count);
final float left = paddingLeft + pageWidth * (mCurrentPage + mPositionOffset);
final float right = left + pageWidth;
final float top = getPaddingTop();
final float bottom = getHeight() - getPaddingBottom();
canvas.drawRect(left, top, right, bottom, mPaint);
}
@Override
public void setViewPager(ViewPager view, int initialPosition) {
setViewPager(view);
setCurrentItem(initialPosition);
}