我上传/发送图像到存储火力和实时数据库。如何上传图像时获得的当前日期和时间?
private void uploadImage() {
if (imgUrl != null) {
final StorageReference fileReference = mStorageRef.child(System.currentTimeMillis() + "." + getFileExtension(imgUrl));
mUploadTask = fileReference.putFile(imgUrl)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
Calendar calendar = Calendar.getInstance();
final String currentdate = DateFormat.getDateInstance().format(calendar.getTime());
SimpleDateFormat format = new SimpleDateFormat("HH:mm:ss");
String time = format.format(calendar.getTime());
Handler handler = new Handler();
handler.postDelayed(new Runnable() {
@Override
public void run() {
uploadProgress.setProgress(0);
}
}, 500);
fileReference.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
Notify upload = new Notify(imgDescription.getText().toString().trim(), uri.toString());
String uploadID = mDatabaseRef.push().getKey();
mDatabaseRef.child(uploadID).setValue(upload);
Toast.makeText(StudentNotify.this, "Upload successfully", Toast.LENGTH_LONG).show();
imgDescription.setText("");
}
});
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
Toast.makeText(StudentNotify.this, e.getMessage(), Toast.LENGTH_LONG).show();
}
})
.addOnProgressListener(new OnProgressListener<UploadTask.TaskSnapshot>() {
@Override
public void onProgress(UploadTask.TaskSnapshot taskSnapshot) {
double progress = (100.0 * taskSnapshot.getBytesTransferred() / taskSnapshot.getTotalByteCount());
uploadProgress.setProgress((int) progress);
}
});
} else {
Toast.makeText(StudentNotify.this, "No file selected", Toast.LENGTH_SHORT).show();
}
}
当我收到你的问题,你要存储当前的时间戳,以及当你存储在火力地堡实时数据库中的图像URL和说明。
您可以在数据库中对每个图像的URL和描述字段一起使用由火力地堡数据库服务器提供ServerValue.TIMESTAMP并将其存储在一个新的时间戳字段。在火力地堡服务器执行写操作时,写在UTC毫秒当前时间戳来代替这个值。此值是一个13位数字值。 https://firebase.google.com/docs/reference/android/com/google/firebase/database/ServerValue
包括下面的代码写为每个图像该值
fileReference.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
Notify upload = new Notify(imgDescription.getText().toString().trim(),
uri.toString());
String uploadID = mDatabaseRef.push().getKey();
mDatabaseRef.child(uploadID).setValue(upload);
mDatabaseRef.child(uploadID).child("timestamp").setValue(ServerValue.TIMESTAMP);
Toast.makeText(StudentNotify.this, "Upload successfully", Toast.LENGTH_LONG).show();
imgDescription.setText("");
}
});
这将创建一个键名“时间戳”为每个图像的新领域与代表如下面毫秒UTC时间戳的13位数字
{
//...
imagePushKeyId1: {
url: "image url here",
desc: "image description here"
timestamp: 1549347429000
}
//....
}
虽然从数据库中读回,你可以在一个可变长整型说“戳”,它转换成日期如下时间得到这个值
Date date = new Date(timestamp);
String dateTimePattern = "MMM dd, yyyy EEE h:mm a";
String dateText = new SimpleDateFormat(dateTimePattern).format(date);
它给dateText格式如下2019年1月28日星期一15:52
使用可以得到它在你通过修改dateTimePattern字符串喜欢的任何格式,请参阅下面的链接了解详情。 https://developer.android.com/reference/java/text/SimpleDateFormat#date-and-time-patterns