目标是压缩配置文件和封面照片，以占用Firebase Storage更少的空间。然后，压缩将必须同时适用于个人资料和封面图像。
private void uploadProfileCoverPhoto(final Uri uri) {
//show progress
pd.show();
/*Instead of creating separate function for profile picture and cover photo this will work in the same function*/
//path and name of image to be stored in firebase storage
String filePathAndName = storagePath+ ""+ profileOrCoverPhoto +"_"+ user.getUid();
StorageReference storageReference2nd = storageReference.child(filePathAndName);
storageReference2nd.putFile(uri)
.addOnSuccessListener(new OnSuccessListener<UploadTask.TaskSnapshot>() {
@Override
public void onSuccess(UploadTask.TaskSnapshot taskSnapshot) {
//image uploaded to storage, now get its url and store in users database
Task<Uri> uriTask = taskSnapshot.getStorage().getDownloadUrl();
while (!uriTask.isSuccessful());
final Uri downloadUri = uriTask.getResult();
//check if image is uploading or not and url received
if (uriTask.isSuccessful()){
//image uploaded
//add/update url in users database
HashMap<String, Object> results = new HashMap<>();
/*first parameter is profileorcover photo thas has value "image" or "cover" which are keys in users database where url of the image
* be saved in of them
* Second parameter contains the url of the image stored in firebase storage, this url will be saved as value against key "image" or "cover"*/
results.put(profileOrCoverPhoto, downloadUri.toString());
databaseReference.child(user.getUid()).updateChildren(results)
.addOnSuccessListener(new OnSuccessListener<Void>() {
@Override
public void onSuccess(Void aVoid) {
//URL IN DATA BASE of user is add succesfully
//dismiss progress bar
pd.dismiss();
Toast.makeText(getActivity(), "Image Updated.", Toast.LENGTH_SHORT).show();
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
//error adding url in database of user
//dismiss progress bar
pd.dismiss();
Toast.makeText(getActivity(), "An error occurred updating the image.", Toast.LENGTH_SHORT).show();
}
});
//if user edit his name, also change it from hist posts
if (profileOrCoverPhoto.equals("image")){
DatabaseReference ref = FirebaseDatabase.getInstance().getReference("Posts");
Query query = ref.orderByChild("uid").equalTo(uid);
query.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot ds: dataSnapshot.getChildren()){
String child = ds.getKey();
dataSnapshot.getRef().child(child).child("uDp").setValue(downloadUri.toString());
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
//update user image in current users comments on posts
ref.addListenerForSingleValueEvent(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot ds: dataSnapshot.getChildren()){
String child = ds.getKey();
if (dataSnapshot.child(child).hasChild("Comments")){
String child1 = ""+dataSnapshot.child(child).getKey();
Query child2 = FirebaseDatabase.getInstance().getReference("Posts").child(child1).child("Comments").orderByChild(uid).equalTo(uid);
child2.addValueEventListener(new ValueEventListener() {
@Override
public void onDataChange(@NonNull DataSnapshot dataSnapshot) {
for (DataSnapshot ds: dataSnapshot.getChildren()){
String child = ds.getKey();
dataSnapshot.getRef().child(child).child("uDp").setValue(downloadUri.toString());
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
}
@Override
public void onCancelled(@NonNull DatabaseError databaseError) {
}
});
}
}
else{
//error
pd.dismiss();
Toast.makeText(getActivity(), "An error has occurred.", Toast.LENGTH_SHORT).show();
}
}
})
.addOnFailureListener(new OnFailureListener() {
@Override
public void onFailure(@NonNull Exception e) {
//there were some error, get and show error message, dismiss progress dialog
pd.dismiss();
Toast.makeText(getActivity(), e.getMessage(), Toast.LENGTH_SHORT).show();
}
});
}
我正在为Android设备（例如WhatsApp）开发应用程序。它已经处于非常高级的状态，我正在纠正遇到的小问题。但这我很难解决...