Android编程权威指南（第2版）--第16章 使用intent拍照 挑战练习

public class  extends DialogFragment {

    private static final String ARG_File = "file";
    private ImageView mPhotoView;

    public static PhotoDetailFragment newInstance(File file) {
        Bundle args = new Bundle();
        args.putSerializable(ARG_File, file);

        PhotoDetailFragment fragment = new PhotoDetailFragment();
        fragment.setArguments(args);
        return fragment;
    }

    
    @Override
    public Dialog onCreateDialog(Bundle savedInstanceState) {
        File file = (File) getArguments().getSerializable(ARG_File);

        View v = LayoutInflater.from(getActivity())
                .inflate(R.layout.dialog_photo, null);
        mPhotoView = (ImageView) v.findViewById(R.id.crime_photo_detail);

        Bitmap bitmap = PictureUtils.getScaledBitmap(
                file.getPath(), getActivity());
        mPhotoView.setImageBitmap(bitmap);

        return new AlertDialog.Builder(getActivity())
                .setView(v)
                
                .setPositiveButton(android.R.string.ok, null)
                .create();

    }
}

private static final int REQUEST_PHOTO = 3;
private static final String DIALOG_PHOTO = "DialogPhoto";

mPhotoView = (ImageView) v.findViewById(R.id.crime_photo);
mPhotoView.setOnClickListener(new View.OnClickListener() {
    @Override
    public void onClick(View view) {
        if (mPhotoFile == null || !mPhotoFile.exists()) {
            mPhotoView.setImageDrawable(null);
        } else {

            FragmentManager manager = getFragmentManager();
            PhotoDetailFragment dialog = PhotoDetailFragment.newInstance(mPhotoFile);
            dialog.setTargetFragment(CrimeFragment.this, REQUEST_PHOTO);
            dialog.show(manager, DIALOG_PHOTO);

        }

    }
});
updatePhotoView();

private void updatePhotoView(int width, int height) {
    if (mPhotoFile == null || !mPhotoFile.exists()) {
        mPhotoView.setImageDrawable(null);
    } else {
        Bitmap bitmap = PictureUtils.getScaledBitmap(
                mPhotoFile.getPath(), width, height); // change this one
        mPhotoView.setImageBitmap(bitmap);
    }
}

mPhotoObserver = mPhotoView.getViewTreeObserver();
mPhotoObserver.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
            @Override
            public void onGlobalLayout() {
                updatePhotoView(mPhotoView.getWidth(), mPhotoView.getHeight());
            }
        });
return v;

else if (requestCode == REQUEST_PHOTO) {
    updatePhotoView(mPhotoView.getWidth(), mPhotoView.getHeight());
}