android - 如何从一个活动中获取选定的图像到来自firebase的第二个活动

Question

我是 android 开发的新手我想通过从第一个活动中获取选定的图像来在另一个片段中显示图像但我收到错误

这是我的网格视图，用户在其中选择图像

@Override
public void onGridImageSelected(Photo photo, int activityNumber) {
    Log.d(TAG, "onGridImageSelected: selected an image gridview: " + photo.toString());
   FullScreenProductFragment fragment = new FullScreenProductFragment();
    Bundle args = new Bundle();
    args.putParcelable(getString(R.string.photo), photo);
    args.putInt(getString(R.string.activity_number), activityNumber);
    fragment.setArguments(args);
    FragmentTransaction transaction  = getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.Profilecontainer, fragment);
    transaction.addToBackStack(getString(R.string.view_post_fragment));
    transaction.commit();
}

这是应查看的所选图像

@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.fragmentfullscreenlayout, container, false);
    mImageView = view.findViewById(R.id.zoom_image);

    Bundle bundle = getActivity().getIntent().getExtras();

    UnivarsalImageLoader.setImage(getPhotoFromBundle().getImage_path(),mImageView, null, "");
    Log.d(TAG, "onCreateView: getphoto from bundle"+getPhotoFromBundle().getImage_path());

    return view;
}
private Photo getPhotoFromBundle(){
    Log.d(TAG, "getPhotoFragment: argumentd"+getArguments());
    Bundle bundle = this.getArguments();

    if (bundle != null){
        return bundle.getParcelable(getString(R.string.photo));
    }else {
        return null;
    }
}

这是我的日志

java.lang.NullPointerException: Attempt to invoke virtual method  'java.lang.String com.example.alpha.lapid.models.Photo.getImage_path()' on a null object reference
    at com.example.alpha.lapid.Utils.FullScreenProductFragment.onCreateView(FullScreenProductFragment.java:56)
    at android.support.v4.app.Fragment.performCreateView(Fragment.java:2346)
    at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.j va:1428)

当我在片段中记录这个 getphotobundle 时，我没有得到任何东西，问题出在哪里，请告诉我

 05-20 08:52:23.534 668-668/com.example.alpha.lapid 
        D/FullScreenProductFragme: getPhotoFragment: argumentdBundle[{}]

标签： androidimagefirebasenullbundle

Answer 1

Bundle bundle = getActivity().getIntent().getExtras();
Photo photo = getPhotoFromBundle(bundle);
if (photo==null) {
   Toast( ... Photo is null ..);
   return;
}

String path = photo.getImage_path();

File file = new File(path);

if (!file.exists()) {
   Toast( .. file does not exist ..);
    return;
 }


 UnivarsalImageLoader.setImage(file.getAbsolutePath(), mImageView, null, "");