当我try 在Firebase实时数据库中存储数据时，所有其他对象都会被存储，除了一个对象，即， postsMap.put("postimage", downloadUrl);，此特定数据不会存储在Firebase实时数据库中，其余所有其他数据都会被存储.
这是我的PostActivity.java代码-
public class PostActivity extends AppCompatActivity {
private Toolbar mToolbar;
private ProgressDialog loadingBar;
private ImageButton SelectPostImage;
private Button UpdatePostButton;
private EditText PostDescription;
private static final int Gallery_Pick = 1;
private Uri ImageUri;
private String Description;
private StorageReference PostsImagesReference;
private DatabaseReference UsersRef, PostsRef;
private FirebaseAuth mAuth;
private String saveCurrentDate, saveCurrentTime, postRandomName,downloadUrl, current_user_id;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_post);
mAuth = FirebaseAuth.getInstance();
current_user_id = mAuth.getCurrentUser().getUid();
PostsImagesReference = FirebaseStorage.getInstance().getReference();
UsersRef = FirebaseDatabase.getInstance().getReference().child("Users");
PostsRef = FirebaseDatabase.getInstance().getReference().child("Posts");
SelectPostImage = findViewById(R.id.select_post_image);
UpdatePostButton = findViewById(R.id.update_post_button);
PostDescription = findViewById(R.id.post_description);
loadingBar = new ProgressDialog(this);
mToolbar = findViewById(R.id.update_post_page_toolbar);
setSupportActionBar(mToolbar);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowHomeEnabled(true);
getSupportActionBar().setTitle("Update Post");
SelectPostImage.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
OpenGallery();
}
});
UpdatePostButton.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
ValidatePostInfo();
}
});
}
private void ValidatePostInfo() {
Description = PostDescription.getText().toString();
if(ImageUri == null)
{
Toast.makeText(this,"Please select post image",Toast.LENGTH_LONG).show();
else if (TextUtils.isEmpty(Description)) {
Toast.makeText(this,"Please say something about your image",Toast.LENGTH_LONG).show();
}
else
{
loadingBar.setTitle("Add New Post");
loadingBar.setMessage("Please wait, while we are creating your new post....");
loadingBar.show();
loadingBar.setCanceledOnTouchOutside(true);
StoringImageToFirebaseStorage();
}
}
private void StoringImageToFirebaseStorage() {
Calendar callForDate = Calendar.getInstance();
SimpleDateFormat currentDate = new SimpleDateFormat("dd-MMMM-yyyy");
saveCurrentDate = currentDate.format(callForDate.getTime());
Calendar callForTime = Calendar.getInstance();
SimpleDateFormat currentTime = new SimpleDateFormat("HH:mm");
saveCurrentTime = currentTime.format(callForDate.getTime());
postRandomName = saveCurrentDate + saveCurrentTime;
StorageReference filePath = PostsImagesReference.child("Post Images").child(ImageUri.getLastPathSegment() + postRandomName + ".jpg");
filePath.putFile(ImageUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if(task.isSuccessful())
{
filePath.putFile(ImageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
filePath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
downloadUrl = uri.toString();
}
});
}
});
Toast.makeText(PostActivity.this,"Image uploaded successfully to storage", Toast.LENGTH_LONG).show();
SavingPostInformationToDatabase();
}
else
{
String message = task.getException().getMessage();
Toast.makeText(PostActivity.this,"Error Occured: " + message, Toast.LENGTH_LONG).show();
}
}
});
}
private void SavingPostInformationToDatabase() {
UsersRef.child(current_user_id).addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot snapshot) {
if(snapshot.exists())
{
String userFullName = snapshot.child("fullname").getValue().toString();
String userProfileImage = snapshot.child("profileimage").getValue().toString();
HashMap postsMap = new HashMap();
postsMap.put("uid", current_user_id);
postsMap.put("date", saveCurrentDate);
postsMap.put("time", saveCurrentTime);
postsMap.put("description", Description);
postsMap.put("postimage", downloadUrl);
postsMap.put("profileimage",userProfileImage);
postsMap.put("fullname", userFullName);
PostsRef.child(current_user_id + postRandomName).updateChildren(postsMap).addOnCompleteListener(new OnCompleteListener() {
@Override
public void onComplete(@NonNull Task task) {
if(task.isSuccessful())
{
SendUserToMainActivity();
Toast.makeText(PostActivity.this,"New Post is created
successfully.",Toast.LENGTH_LONG).show();
loadingBar.dismiss();
}
else
{
Toast.makeText(PostActivity.this,"Error occured while creating your post",Toast.LENGTH_LONG).show();
loadingBar.dismiss();
}
}
});
}
}
@Override
public void onCancelled(@NonNull DatabaseError error) {
}
});
}
private void OpenGallery() {
Intent galleryIntent = new Intent();
galleryIntent.setAction(Intent.ACTION_GET_CONTENT);
galleryIntent.setType("image/*");
startActivityForResult(galleryIntent,Gallery_Pick);
}
@Override
protected void onActivityResult(int requestCode, int resultCode, @Nullable Intent data) {
super.onActivityResult(requestCode, resultCode, data);
if(requestCode == Gallery_Pick && resultCode == RESULT_OK && data!=null)
{
ImageUri = data.getData();
SelectPostImage.setImageURI(ImageUri);
}
}
@Override
public boolean onOptionsItemSelected(@NonNull MenuItem item) {
int id = item.getItemId();
if(id == androidx.appcompat.R.id.home)
{
SendUserToMainActivity();
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onSupportNavigateUp() {
getOnBackPressedDispatcher().onBackPressed();
return super.onSupportNavigateUp();
}
private void SendUserToMainActivity() {
Intent mainIntent = new Intent(PostActivity.this, MainActivity.class);
startActivity(mainIntent);
}
}
这是我的Firebase数据库的图像，所有其他对象都在被存储，但只有 postsMap.put("postimage", downloadUrl);个对象没有被存储.
这是我的html代码-
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:id="@+id/main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@drawable/login_register"
tools:context=".PostActivity">
<include
android:id="@+id/update_post_page_toolbar"
layout="@layout/app_bar_layout"
/>
<ImageButton
android:id="@+id/select_post_image"
android:layout_width="match_parent"
android:layout_height="300dp"
android:layout_below="@id/update_post_page_toolbar"
android:layout_alignParentStart="true"
android:layout_margin="20dp"
android:layout_marginTop="30dp"
android:scaleType="fitCenter"
app:srcCompat="@drawable/select_image" />
<EditText
android:id="@+id/post_description"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@id/select_post_image"
android:layout_centerHorizontal="true"
android:layout_margin="10dp"
android:background="@drawable/inputs"
android:ems="10"
android:gravity="start|top"
android:hint="write something about your image here"
android:inputType="textMultiLine"
android:padding="15dp"
/>
<Button
android:id="@+id/update_post_button"
android:layout_width="200dp"
android:layout_height="wrap_content"
android:layout_below="@id/post_description"
android:layout_centerHorizontal="true"
android:layout_margin="70dp"
android:background="@drawable/button"
android:padding="10dp"
android:text="Create Post"
android:textColor="@android:color/background_light"
android:textSize="18sp" />
</RelativeLayout>
以下是我的Gradle依赖项-
dependencies {
implementation(platform("com.google.firebase:firebase-bom:32.8.0"))
implementation("com.google.firebase:firebase-database")
implementation libs.appcompat
implementation libs.material
implementation libs.activity
implementation libs.constraintlayout
implementation libs.firebase.auth
implementation libs.design
testImplementation libs.junit
androidTestImplementation libs.ext.junit
androidTestImplementation libs.espresso.core
implementation 'com.android.support:design:28.0.0'
implementation 'de.hdodenhof:circleimageview:3.1.0'
api 'com.theartofdev.edmodo:android-image-cropper:2.8.+'
implementation 'com.squareup.picasso:picasso:2.5.2'
implementation 'com.github.bumptech.glide:glide:4.16.0'
}
帖子图像将存储在Firebase存储中.
我认为这段代码有问题，但我想不出到底是什么问题，所以请帮忙.
StorageReference filePath = PostsImagesReference.child("Post Images").child(ImageUri.getLastPathSegment() + postRandomName + ".jpg");
filePath.putFile(ImageUri).addOnCompleteListener(new OnCompleteListener<UploadTask.TaskSnapshot>() {
@Override
public void onComplete(@NonNull Task<UploadTask.TaskSnapshot> task) {
if(task.isSuccessful())
{
filePath.putFile(ImageUri).addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
filePath.getDownloadUrl().addOnSuccessListener(new OnSuccessListener<Uri>() {
@Override
public void onSuccess(Uri uri) {
downloadUrl = uri.toString();
}
});
}
});
Toast.makeText(PostActivity.this,"Image uploaded successfully to storage", Toast.LENGTH_LONG).show();
SavingPostInformationToDatabase();
}
else
{
String message = task.getException().getMessage();
Toast.makeText(PostActivity.this,"Error Occured: " + message, Toast.LENGTH_LONG).show();
}
}
});
}