如何将 Firebase 数据库中的所有图像存储在索引值下。
This is sample screenshot of my firebase database structure
这是我的照片上传类，但图像仅使用单个 id 和单个图像 url 进行存储。如何将多个图像上传到 firebase 数据库并检索 .请帮助我，我是 Firebase 数据库多图像上传的新手。
public class PhotoUploadActivity extends AppCompatActivity implements View.OnClickListener {
private String mListID,mInspectionID;
private FirebaseStorage firebaseStorage;
private StorageReference storageReference;
private Button openCustomGallery;
private Button mUploadPhoto;
private GridView selectedImageGridView;
private static final int CustomGallerySelectId = 1;//Set Intent Id
public static final String CustomGalleryIntentKey = "ImageArray";//Set Intent Key Value
private List<String> selectedImages;
private GalleryAdapter adapter;
private String imagesArray;
private String timestampString;
private String formattedTimestamp;
private Long timestamp;
private int failUplaod;
private int successUpload;
private ProgressDialog uploadProgress;
private String pathPhoto;
private String remarkPhoto;
private int currentprogress;
private ImageView currentImage;
private String mTestID;
private ArrayList<String > blogimages;
private String mKeyID, mAddress, mLocationKey, mRegion;
private HashMap<String,Object> photos = new HashMap<>();
private HashMap<String, String> metadata = new HashMap<>();
public static boolean loaded = false;
StorageReference mstorageReference;
DatabaseReference mdatabaseReference;
FirebaseAuth firebaseAuth;
DatabaseReference userdatabaseReference;
EditText desc;
Button upload;
private ProgressDialog mProgressbar;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.view_selected);
setTitle("Write Post");
mProgressbar = new ProgressDialog(this);
initViews();
setListeners();
mstorageReference = FirebaseStorage.getInstance().getReference();
mdatabaseReference = FirebaseDatabase.getInstance().getReference().child("Blog");
firebaseAuth = FirebaseAuth.getInstance();
userdatabaseReference = FirebaseDatabase.getInstance().getReference().child("Users").child(firebaseAuth.getCurrentUser().getUid());
upload = (Button)findViewById(R.id.new_post_submit);
desc = (EditText)findViewById(R.id.new_post_text);
upload.setOnClickListener(new View.OnClickListener()
{
@Override
public void onClick(View view)
{
UploadTask uploadTask;
if( selectedImageGridView.getChildCount()!= 0)
{
blogimages = new ArrayList<>();
mProgressbar.setMessage("Post Uploading_Please Wait.....");
mProgressbar.show();
for ( int i = 0; i < selectedImages.size(); i++) {
Uri uri = Uri.parse("file://"+selectedImages.get(i));
Log.v("URIIII", String.valueOf(uri));
final String CurrentUser = firebaseAuth.getCurrentUser().getUid();
StorageReference reference = mstorageReference.child("Blog_pics/users").child(uri.getLastPathSegment());
uploadTask = reference.putFile(uri);
uploadTask.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
@Override
public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
//todo: if want to make this the full progress bar, just need to make this as the sum of all progress and add to the main progress dialog
double progress = (100.0 * (taskSnapshot.getBytesTransferred()) / taskSnapshot.getTotalByteCount());
mProgressbar.setMessage("Uploading Images.....");
mProgressbar.show();
}
}).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
final Uri downloaduri = taskSnapshot.getDownloadUrl();
Log.v("DOWNLOAD URI", String.valueOf(downloaduri));
blogimages.add(downloaduri.toString());
Log.v("BLOGGIMAGES", String.valueOf(blogimages));
// final String path= uri.getLastPathSegment();
final String key = mdatabaseReference.push().getKey();
final String posttitle = desc.getText().toString();
final String CurrentUser = firebaseAuth.getCurrentUser().getUid();
userdatabaseReference.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(DataSnapshot dataSnapshot) {
DateFormat df = new SimpleDateFormat("dd/MM/yyyy HH:mm:ss");
Date today = Calendar.getInstance().getTime();
final String current_time = df.format(today);
Blog blog = new Blog();
long millis = System.currentTimeMillis();
int timestamp = ((int) (millis/1000))* -1;
blog.setTimestamp(current_time);
blog.setTime(timestamp);
blog.setTitle(posttitle);
blog.setUrl(blogimages);
blog.setUid(firebaseAuth.getCurrentUser().getUid());
blog.setUsername(dataSnapshot.child("name").getValue().toString());
blog.setImage(dataSnapshot.child("image").getValue().toString());
mdatabaseReference.child(key).setValue(blog) .addOnSuccessListener(new OnSuccessListener<Void>()
{
@Override
public void onSuccess(Void aVoid)
{
Intent mm = new Intent(PhotoUploadActivity.this, MainActivity.class);
startActivity(mm);
}
}).addOnFailureListener(new OnFailureListener()
{
@Override
public void onFailure(@NonNull Exception e)
{
Toast.makeText(PhotoUploadActivity.this,"Failed to post the blog.. Try again later",Toast.LENGTH_LONG).show();
}
});
}
@Override
public void onCancelled(DatabaseError error) {
}
});
}
}) .addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception exception) {
Toast.makeText(getApplicationContext(), exception.getMessage(), Toast.LENGTH_LONG).show();
}
});
}
}else
{
Toast.makeText(PhotoUploadActivity.this,"Please enter all fields and Select images.",Toast.LENGTH_LONG).show();
}
}
});
selectedImageGridView.setOnItemLongClickListener(new AdapterView.OnItemLongClickListener() {
@Override
public boolean onItemLongClick(AdapterView<?> parent, View view, final int position, long id) {
AlertDialog.Builder deleteDialog = new AlertDialog.Builder(PhotoUploadActivity.this)
.setTitle("Delete Item?")
.setMessage("Do you want to remove this item?")
.setNegativeButton("No", null)
.setPositiveButton("Yes", new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
adapter.removeitem(position);
adapter.notifyDataSetChanged();
/*Or you can do it this way if the top one doesnt work:
selectedImageGridView.setAdapter(null);*/
}
});
deleteDialog.create().show();
return true;
}
});
}
private void initViews() {
openCustomGallery = (Button) findViewById(R.id.openCustomGallery);
selectedImageGridView = (GridView) findViewById(R.id.selectedImagesGridView);
// mUploadPhoto = (Button) findViewById(R.id.UploadPhotos);
}
//set Listeners
private void setListeners() {
openCustomGallery.setOnClickListener(this);
}
@Override
public void onClick(View view) {
switch (view.getId()) {
case R.id.openCustomGallery:
//Start Custom Gallery Activity by passing intent id
Intent intent = new Intent(PhotoUploadActivity.this, CustomGalleryActivity.class);
startActivityForResult(intent, CustomGallerySelectId);
break;
}
}
@Override
protected void onActivityResult(int requestcode, int resultcode, Intent imagereturnintent) {
super.onActivityResult(requestcode, resultcode, imagereturnintent);
switch (requestcode) {
case CustomGallerySelectId:
if (resultcode == RESULT_OK) {
imagesArray = imagereturnintent.getStringExtra(CustomGalleryIntentKey);//get Intent data
//Convert string array into List by splitting by ',' and substring after '[' and before ']'
selectedImages = Arrays.asList(imagesArray.substring(1, imagesArray.length() - 1).split(", "));
//loadGridView(new ArrayList<String>(selectedImages));//call load gridview method by passing converted list into arrayList
adapter = new GalleryAdapter(PhotoUploadActivity.this,new ArrayList<>(selectedImages),false);
selectedImageGridView.setAdapter(adapter);
}
break;
}
}
@Override
public void onBackPressed() {
super.onBackPressed();
}
//I'm saving the instance state of photos.. let's see how
@Override
protected void onSaveInstanceState(Bundle outState) {
super.onSaveInstanceState(outState);
outState.putSerializable("Photos",photos);
}
@Override
protected void onRestoreInstanceState(Bundle savedInstanceState) {
super.onRestoreInstanceState(savedInstanceState);
savedInstanceState.getSerializable("Photos");
}
}
最佳答案
要解决此问题，请将图像 URL 存储在 Map 中。您的数据库结构应如下所示:
Firebase-root
|
--- Blog
|
--- blogId
|
--- urls
| |
| --- "https://firebasestorage...": true
| |
| --- "https://firebasestorage...": true
|
--- //the other blog details
要显示所有这些图像，只需获取 urls 对象(这是一个 map )并迭代以获取实际照片 URL 的键。
编辑:
还有一种替代结构，如下所示:
Firebase-root
|
--- Blog
|
--- blogId
|
--- urls
| |
| --- pushedKeyOne: "https://firebasestorage..."
| |
| --- pushedKeyTwo: "https://firebasestorage..."
|
--- //the other blog details
关于java - 如何将多个图像上传到firebase数据库并检索，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/50907966/