【发布时间】：2019-04-12 03:23:26
【问题描述】：
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。我打算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) 是 "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 “无效请求。缺少 X-Goog-Upload-Command 标头。”
但是当我使用从 URL 到数组列表的链接测试我的代码时，它可以工作。但是为什么我无法从我的数据库中获取图像呢？
我似乎找不到问题所在。我在想它可能是 arraylist、photo_id url 或我上传到 firebase 存储/实时数据库的方式，可能是因为我无法将文件名作为 .png 或 .jpeg 并将其存储为 photo_id？
更新：我将 url 链接更改为从 Firebase Storage 下载 url，但我无法从 DatabaseReference 中检索链接，这导致列表中没有添加任何内容
我一直在学习这个教程。Coding-In-Flow Tutorial
UPDATE2：我遇到了嵌套数据问题。我只想从实时数据库中获取 photo_id 值（即 url），但我将它作为空值获取。更改回收站视图后，占位符图像为空。除非有办法，否则我应该如何仅将我的数据从角色子项检索到 character_id（已经无法检索）。我一直在搜索 stackoverflow 上的其他答案，但没有一个与我正在寻找的答案相匹配。
我的原木猫说
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();
}
}
【问题讨论】：
-
您的图片是否存储在 Firebase 存储中？如果是这样，请尝试从 Firebase 存储中读取。如果你保存的图片的名字是用户名，你可以从路径中读取用户名并从那里接收图片。
-
它们已存储，我设法将 photo_id url 更改为来自 Firebase 存储的 downlow url 下的正确地址。现在，我正在尝试让 DatabaseReference 使角色出现在 photo_id 下。当我运行它时，主页片段中没有发生任何事情，而只有测试代码。我需要从 StorageReference 中获取它吗？
-
在 onBindViewHolder 下检查 oc.getPhoto_id() 是否返回 null 值是否返回您的图片链接
-
我认为通过从 Firebase Storage 读取来获取图像会很简单。我无法获得确切的链接，但我知道一个名为 Code In Flow 的 YouTube 频道提供了有关如何从 Firebase Storgae 检索图像的精彩教程。您可以查看它们以学习从 Firebase 存储中读取数据。这可能会有所帮助。
-
我确实有一个嵌套表。当我将其更改为 characterReference.child(userid).orderByChild(user.getUid()).addValueEventListener(new ValueEventListener ()....我得到 W/ClassMapper: No setter/field for -LQo0mbXKgYa2HIgkBSn found on class etc.
标签： android firebase firebase-realtime-database