我需要显示应用程序中每张照片的上传时间,并且我正在考虑使用Firebase Storage中的元数据。我可以获取所需的时间和日期,但仅针对特定图像,如何获取所有图像并将其显示在适当的位置,而不必将其放在模型类中? (不知道如何将其包括在模型类中,因为我没有将数据保存在firebase数据库中,所以我只是直接从存储中获取数据。)>
这里是我到目前为止所做的,以及如何获取一张图像的时间和日期:
storageRef = FirebaseStorage.getInstance().getReference().child("Posts/1577360878055.jpg");
..
holder.storageRef.getMetadata().addOnSuccessListener(new OnSuccessListener<StorageMetadata>() { @Override public void onSuccess(StorageMetadata storageMetadata) { Calendar calendar = Calendar.getInstance(); calendar.setTimeInMillis(storageMetadata.getCreationTimeMillis()); int mYear = calendar.get(Calendar.YEAR); int mMonth = calendar.get(Calendar.MONTH); int mDay = calendar.get(Calendar.DAY_OF_MONTH); int hour = calendar.get(Calendar.HOUR_OF_DAY); int min = calendar.get(Calendar.MINUTE); Log.e("metadata",""+calendar.get(Calendar.DAY_OF_MONTH)+"/"+calendar.get(Calendar.MONTH)+"/"+calendar.get(Calendar.YEAR)+" :: "+calendar.get(Calendar.HOUR_OF_DAY)+":"+calendar.get(Calendar.MINUTE)); holder.t_counter.setText(calendar.get(Calendar.DAY_OF_MONTH)+"/"+calendar.get(Calendar.MONTH)+"/"+calendar.get(Calendar.YEAR)); } }).addOnFailureListener(new OnFailureListener() { @Override public void onFailure(@NonNull Exception exception) { // Uh-oh, an error occurred! } });
我必须先将日期传输到Firebase数据库,然后通过模型类在代码中读取它吗?如果是,我该怎么做?如何将日期元数据传输到Firebase数据库?如果需要的话,我还可以显示将图像URI从存储发送到数据库的那部分代码。
用于将数据上传到数据库的代码:
//get image URI
private String getFileExtension(Uri uri) {
ContentResolver cR = getContentResolver();
MimeTypeMap mime = MimeTypeMap.getSingleton();
return mime.getExtensionFromMimeType(cR.getType(uri));
}
//function to upload image to Firebase storage and send URL to Database
private void uploadFile() {
if (mImageUri == null ) {
Toast.makeText(this, "No image selected", Toast.LENGTH_LONG).show();
} else {
StorageReference fileReference = mStorageRef.child(System.currentTimeMillis()
+ "." + getFileExtension(mImageUri));
mUploadTask = fileReference.putFile(mImageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Toast.makeText(AdminUploadActivity.this, "Upload successful", Toast.LENGTH_LONG).show();
//get image url from storage
Task<Uri> urlTask = taskSnapshot.getStorage().getDownloadUrl();
while (!urlTask.isSuccessful()) ;
Uri downloadUrl = urlTask.getResult();
Posts upload;
//call the constructor from the Posts class in "models" package
upload = new Posts(downloadUrl.toString(), mEditTextFileName.getText().toString().trim(), mAuth.getUid());
String uploadId = mDatabaseRef.push().getKey();
mDatabaseRef.child(uploadId).setValue(upload);
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(AdminUploadActivity.this, 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());
}
});
}
}
我需要显示应用程序中每张照片的上传时间,并且我正在考虑使用Firebase Storage中的元数据。我可以获取需要的时间和日期,但仅适用于特定的...
在String的帮助下提供路径,以便以后使用。确保您提供正确的路径。