Android-如何“无效” FragmentPagerAdapter中的片段？

Question

I have an Android FragmentPagerAdapter that uses BitmapFragment (below), and it works great. Now I'm trying to switch out the Images on the fly. I've tried changing the ImageView but nothing changes. And I've tried using a FragmentTransaction.replace to swap it out, but I get an Invalid Argument exception. I know getImageViewAtPage() works and "bitmap" is a valid Bitmap.

Thanks!

private class BitmapFragment extends Fragment {
    private int mPosition = 0;
    private ImageView mImageView;

    private BitmapFragment(int num){
        super();
        mPosition = num;
    }

    public ImageView getImageView(){
        return mImageView;
    }

    /**
     * The Fragment's UI is just a Bitmap
     */
    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
            Bundle savedInstanceState) {
        View v = inflater.inflate(R.layout.fragment_bitmap, container, false);
        try{
            mImageView = (ImageView) v.findViewById(R.id.bitmap);
            mImageView.setImageBitmap(bitmap);   
        }
        catch(Exception e){
            e.printStackTrace();
        }
        return v;
    }
}

        private void changeImage() {
            /*

            BitmapFragment bf = new BitmapFragment(mCurrentPageIndex);
            FragmentTransaction ft = mReaderViewHandler.getSupportFragmentManager().beginTransaction();
            ft.replace(R.layout.fragment_bitmap, bf);
            ft.commit();
    */
            ImageView v = getImageViewAtPage(mCurrentPageIndex);
            try {
                v.setImageBitmap(bitmap);
            } catch (Exception e) {

                e.printStackTrace();
            }
            v.invalidate();
        }

Answer 1

请试着做mImageView.setImageBitmap()的内部changeImage()方法，而不是采用v = getImageViewAtPage和做v.setImageBitmap()