child

public @NonNullDataSnapshot child(@NonNullString path)

Get a DataSnapshot for the location at the specified relative path. The relative path can either be a simple child key (e.g. 'fred') or a deeper slash-separated path (e.g. 'fred/name/first'). If the child location has no data, an empty DataSnapshot is returned.

exists

public boolean exists()

Returns true if the snapshot contains a non-null value.

getChildren

public @NonNullIterable<DataSnapshot> getChildren()

Gives access to all of the immediate children of this snapshot. Can be used in native for loops:

for (DataSnapshot child : parent.getChildren()) {      ...}

getChildrenCount

public long getChildrenCount()

getKey

public @NullableString getKey()

getPriority

public @NullableObject getPriority()

Returns the priority of the data contained in this snapshot as a native type. Possible return types:

• Double
• String

getRef

public @NonNullDatabaseReference getRef()

Used to obtain a reference to the source location for this snapshot.

getValue

public @NullableObject getValue()

getValue() returns the data contained in this snapshot as native types. The possible types returned are:

• Boolean
• String
• Long
• Double
• Map<String, Object>
• List<Object>

getValue

public @Nullable T <T>getValue(@NonNullGenericTypeIndicator<T> t)

Due to the way that Java implements generics, it takes an extra step to get back a properly-typed Collection. So, in the case where you want ajava.util.List of Message instances, you will need to do something like the following:

    GenericTypeIndicator<List<Message>> t = new GenericTypeIndicator<List<Message>>() {};    List<Message> messages = snapshot.getValue(t);

getValue

public @NullableObject getValue(boolean useExportFormat)

getValue() returns the data contained in this snapshot as native types. The possible types returned are:

• Boolean
• String
• Long
• Double
• Map<String, Object>
• List<Object>

If useExportFormat is set to true, priority information will be included in the output. Priority information shows up as a .priority key in a map. For data that would not otherwise be a map, the map will also include a .value key with the data.

getValue

public @Nullable T <T>getValue(@NonNullClass<T> valueType)

This method is used to marshall the data contained in this snapshot into a class of your choosing. The class must fit 2 simple constraints:

1. The class must have a default constructor that takes no arguments
2. The class must define public getters for the properties to be assigned. Properties without a public getter will be set to their default value when an instance is deserialized

classMessage {privateStringauthor;privateStringtext;privateMessage() {}publicMessage(Stringauthor,Stringtext) {this.author =author;this.text =text;        }publicStringgetAuthor() {returnauthor;        }publicStringgetText() {returntext;        }    }    //LaterMessagem = snapshot.getValue(Message.class);

hasChild

public boolean hasChild(@NonNullString path)

Can be used to determine if this DataSnapshot has data at a particular location

hasChildren

public boolean hasChildren()

Indicates whether this snapshot has any children

toString

public String toString()

DatabaseKt.getValue

public final T <T extends Object>DatabaseKt.getValue(@NonNullDataSnapshot receiver)

Returns the content of the DataSnapshot converted to a POJO.

Supports generics like List<> or Map<>. Use @JvmSuppressWildcards to force the compiler to use the typeT, and not? extends T.