如何从 firebase 中获取一张 activity 到第二张 activity 的选定图像

Question

我是 android 开发的新手我想通过从第一个 activity 中获取选定图像来显示另一个片段中的图像，但我收到错误

这是我的网格视图，用户可以在其中选择图像

@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();
}

这是应该查看的所选图像

@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请告诉我问题出在哪里

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

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, "");

Answer 2

我通过在我的 main activity 中调用这个来解决我正在调用 fragment 如果你想获取所选图片的所有照片细节，你可以使用此代码，否则你想要单张图片使用我的朋友 greenapps 代码 on

public class Profile_Activity extends AppCompatActivity implements
    ProfileFragment.OnGridImageSelectedListner ,
    ViewPostFragment.OnCommentThreadSelectedListener,
    ViewProfileFragment.OnGridImageSelectedListner,

ViewPostFragment.Ontiemlistner{

private static final String TAG = "ProfileActivity";
@Override
public void ontimlistner(Photo photo) {
    Bundle args = new Bundle();
    FullScreenProductFragment fragment = new FullScreenProductFragment();
    args.putParcelable("large", photo);
    fragment.setArguments(args);
    FragmentTransaction transaction  = getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.full_screen_container, fragment);
    transaction.addToBackStack(getString(R.string.fragment_full_screen_product));
    transaction.commit();
}
@Override
public void onCommentThreadSelectedListener(Photo photo) {
    ViewCommetFragment fragment = new ViewCommetFragment();
    Bundle args = new Bundle();
    args.putParcelable(getString(R.string.photo), photo);
    fragment.setArguments(args);
    FragmentTransaction transaction = getSupportFragmentManager().beginTransaction();
    transaction.replace(R.id.Profilecontainer, fragment);
    transaction.addToBackStack(getString(R.string.view_comments_fragment));
    transaction.commit();
}
@Override
public void onGridImageSelected(Photo photo, int activityNumber) {
    Log.d(TAG, "onGridImageSelected: selected an image gridview: " + photo.toString());
    ViewPostFragment fragment = new ViewPostFragment();

    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();
}

我在片段中调用它，我希望显示该图像

public FullScreenProductFragment(){
super();
setArguments(new Bundle());
}
@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 = this.getArguments();


     photo = getPhotoFromBundle();

    setProduct();



    return view;
}

 public Photo getPhotoFromBundle(){
    Log.d(TAG, "getPhotoFragment: argumentd"+getArguments());
    Bundle bundle = this.getArguments();
    if (bundle != null){
        return bundle.getParcelable("large");
    }else {
        return null;
    }
   }

片段中的这段代码，我在该网格视图上添加了点击侦听器

 public  interface  Ontiemlistner{
 void ontimlistner(Photo photo);
 }
 Ontiemlistner ontiemlistner;
 public ViewPostFragment(){
 super();
 setArguments(new Bundle());
 }


added this code in my gridon item click listener 

 Photo = mPhoto;
 ontiemlistner.ontimlistner(mPhoto);

如何从 firebase 中获取一张 activity 到第二张 activity 的选定图像

how to get selected image from one activity to second activity from firebase

null

android

bundle

image

firebase