这是我的Firebase实时数据库表。我确实有一个图像存储在Firebase存储中。我计划在此表中的“字符”列下使用多个字符。
我不明白为什么我无法从实时数据库中获取photo_id。链接（photo_id）为“ https://firebasestorage.googleapis.com/v0/b/occreations-b6c14.appspot.com/o?name=characterimage%2FWk80hB04oZRMQxK9Ig0DDgoL5n52%20be58f895-8fda-4dd1-9e15-32e4186eae8a&uploadType=resumable&upload_id=AEnB2UrkBecZTlE4kpNypl-1ACjekw1CIM3UsUxXgRGXHLB4DCmyLDI-i70OxqjwKchf7sf3YURhgCFq3KxV7JUPDy55GyZWSg&upload_protocol=resumable” 当我单击此链接时，它显示“无效的请求。缺少X-Goog-Upload-Command标头。”
但是当我使用从URL到arraylist的链接测试代码时，它可以工作。但是为什么我不能从数据库中获取图像？
我似乎找不到问题。我以为它可能是arraylist，photo_id url或我上载到Firebase存储/实时数据库的方式，也许是因为无法获取文件名.png或.jpeg并将其存储为photo_id吗？
更新：我更改了URL链接以从Firebase Storage下载URL，但是我无法从DatabaseReference中检索该链接，因此没有任何内容添加到列表中
我正在关注本教程。Coding-In-Flow Tutorial
UPDATE2：：嵌套数据有问题。我只想从实时数据库中获取photo_id值（即url），但我将其作为空值获取。更改recyclerview后，占位符图像为null。除非有办法，我应该如何仅从字符子项到character_id（已经无法检索）检索数据。我一直在搜索关于stackoverflow的其他答案，但没有一个与我正在寻找的答案匹配。
我的日志猫说
W/ClassMapper: No setter/field for -LQq7dIvsJX7GgNfXeIf found on class com.example.linda.originalcharacterapp.model.CharacterInformation
No setter/field for -LQq7SB5qvcNXdJEzwBh found on class
com.example.linda.originalcharacterapp.model.CharacterInformation
D/TAG: null / null
W/ClassMapper: No setter/field for username found on class
com.example.linda.originalcharacterapp.model.CharacterInformation
No setter/field for email found on class
com.example.linda.originalcharacterapp.model.CharacterInformation
No setter/field for password found on class
com.example.linda.originalcharacterapp.model.CharacterInformation
D/TAG: null / null
Current Image sitting in Firebase Storage
HomeFragment.class
mRecyclerView.setHasFixedSize(true);
mLayoutManager = new LinearLayoutManager (this.getActivity());
mRecyclerView.setLayoutManager(new GridLayoutManager (this.getActivity(),2));
userOCs = new ArrayList<> ();
//DatabaseReference characterReference = FirebaseDatabase.getInstance().getReference();
reference.child(userid).orderByChild("characters").getRef().addValueEventListener (new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
//Display images of ocs
for(DataSnapshot characterSnapshot : dataSnapshot.getChildren()){
if (dataSnapshot.exists()) {
String photoid = dataSnapshot.child ("photo_id").getValue (String.class);
String cName = dataSnapshot.child ("characterName").getValue (String.class);
CharacterInformation oc = characterSnapshot.getValue (CharacterInformation.class);
Log.d ("TAG", photoid + " / " + cName);
userOCs.add (oc);
Toast.makeText (getActivity (), "Adding images " + oc.getCharacterName (), Toast.LENGTH_SHORT).show ();
}
}
String file = "https://firebasestorage.googleapis.com/v0/b/occreations-b6c14.appspot.com/o/characterimage%2FWk80hB04oZRMQxK9Ig0DDgoL5n52%2F3aa5daa6-86b7-41e5-b6aa-2dae58a991ef.png?alt=media&token=5a4e9c2a-e1f8-4d05-904a-a1d934524a09";
userOCs.add(new CharacterInformation("12", "23",file, " Linda", "12", "Time ANGEL", "Quirk","Justin", "Flight", "lIVES IN MAIN"));
mAdapter = new RecycleViewAdapter (userOCs, getActivity()); //where the image is inserted
mRecyclerView.setAdapter(mAdapter);
}
CreateCharacter.class
private void uploadOC() {
//String values
nameValue = cName.getText ().toString ().trim ();
ageValue = cAge.getText ().toString ().trim ();
speciesValue = cSpecies.getText ().toString ().trim();
personalityValue = cPersonality.getText ().toString ().trim();
familyValue = cFamily.getText ().toString ().trim();
powerValue = cPowers.getText ().toString ().trim();
bioValue = cBiography.getText ().toString ().trim();
currentUserID = firebaseAuth.getCurrentUser().getUid();
if (!TextUtils.isEmpty (nameValue) && selectedImage != null) {
// StorageReference fileReference = storageReference.child(System.currentTimeMillis()+ "." + getFileExtension(downloadImage));
storageReference = storageReference.child("characterimage").child (currentUserID + "/" + UUID.randomUUID ().toString ());
storageReference.putFile (selectedImage)
.addOnSuccessListener (new OnSuccessListener<UploadTask.TaskSnapshot> () {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
downloadImage = taskSnapshot.getUploadSessionUri ();
String characterId = databaseReference.child("characters").push ().getKey(); //creates unique random id
// String photoName = taskSnapshot.getMetadata().getReference().getDownloadUrl().toString();
CharacterInformation newCharacter = new CharacterInformation (currentUserID, characterId, downloadImage.toString(),nameValue, ageValue, speciesValue,
personalityValue, familyValue, powerValue, bioValue);
Map<String, Object> postValue = newCharacter.toMap();
Map<String, Object> childUpdates = new HashMap<> ();
databaseReference.child("User Account").child(currentUserID).child("character").child(characterId).setValue(newCharacter);
childUpdates.put(nameValue, newCharacter);
databaseReference.updateChildren (childUpdates);
Toast.makeText (getActivity (), "Uploaded", Toast.LENGTH_SHORT).show ();
}
})
.addOnFailureListener (new OnFailureListener () {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText (getActivity (), "Failed " + e.getMessage (), Toast.LENGTH_SHORT).show ();
}
})
.addOnProgressListener (new OnProgressListener<UploadTask.TaskSnapshot> () {
@Override
public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
double progress = (100.0 * taskSnapshot.getBytesTransferred () / taskSnapshot
.getTotalByteCount ());
}
});
}
else {
Toast.makeText (getActivity (), "Character needs name", Toast.LENGTH_SHORT).show ();
}
}
RecyclerViewAdapter.class
public class RecycleViewAdapter extends RecyclerView.Adapter<RecycleViewAdapter.ViewHolder> {
private List<CharacterInformation> mDataset;
private Context context;
public static class ViewHolder extends RecyclerView.ViewHolder {
private ImageView image;
private Context context;
private ViewHolder(View view) {
super(view);
image = (ImageView) view.findViewById(R.id.recycleImage);
}
}
public RecycleViewAdapter(List<CharacterInformation> myDataset, Context context) {
mDataset = myDataset;
this.context = context;
}
@Override
public RecycleViewAdapter.ViewHolder onCreateViewHolder(ViewGroup parent,
int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recyclerview_row, parent, false);
ViewHolder vh = new ViewHolder(view);
return vh;
}
@Override
public void onBindViewHolder(ViewHolder holder, int position) {
holder.image.setScaleType (ImageView.ScaleType.CENTER_CROP);
CharacterInformation oc = mDataset.get(position);
Picasso.get().load(oc.getPhoto_id ())
.into(holder.image);
System.out.println("Binding images...");
Toast.makeText (context,"Binding images" + oc.getCharacterName(), Toast.LENGTH_SHORT).show();
holder.image.setOnClickListener (new View.OnClickListener () {
@Override
public void onClick(View v) {
AppCompatActivity activity = (AppCompatActivity) v.getContext();
DisplayCharacter ocFragment = new DisplayCharacter ();
activity.getSupportFragmentManager().beginTransaction().replace(R.id.fragment_container, ocFragment).addToBackStack(null).commit();
}
});
}
@Override
public int getItemCount() {
return mDataset.size();
}
}
答案 0 :(得分：0)
我已经找到了这个问题的答案 这就是我解决问题的方式，但更像是我遇到了无设置字段问题和从数据库引用调用的问题。
W/ClassMapper: No setter/field for class
我必须调用数据库引用才能获取嵌套数据。
public void retrieveUserOCs() {
System.out.println("Revoke the character reference ");
reference = FirebaseDatabase.getInstance().getReference("User Account");
DatabaseReference characterReference = reference.child(user.getUid()).child("character");
// final Query query = characterReference;
reference.child(user.getUid()).child("character").addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
////Loop 1 to go through all the child nodes of characters
for(DataSnapshot characterSnapshot : dataSnapshot.getChildren()){
if (dataSnapshot.getValue() != null ) {
CharacterInformation oc = characterSnapshot.getValue (CharacterInformation.class);
String ocKey = characterSnapshot.getKey ();
System.out.println ("Adding ocs: " + ocKey + " Name: " + oc.getCharacterName ());
Log.d ("TAGGING OCS", ocKey + " / " + oc.getCharacterName ());
userOCs.add (oc);
Toast.makeText (getContext(), "Adding images " + oc.getCharacterName (), Toast.LENGTH_SHORT).show ();
} else { //if user haven't added any characters
break;
}
}
String file2 ="http://ghostfinder101.weebly.com/uploads/1/9/7/3/19737887/published/gear-of-diamond_1.png?1541826567";
userOCs.add(new CharacterInformation("34", "124",file2, "Diamond", "2002", "Diamond Angel", "Narcissistic","Jahara(friend)", "Flight, shard attacks", "lIVES IN MAIN"));
mAdapter = new RecycleViewAdapter (userOCs, getActivity()); //where the image is inserted
mRecyclerView.setAdapter(mAdapter);
}
@Override
public void onCancelled(DatabaseError databaseError) {
System.out.println("Database error");
}
});
}