io.flutter.embedding.engine.systemchannels.KeyboardChannel Class Reference

Classes
interface	KeyboardMethodHandler

Public Member Functions
	KeyboardChannel (@NonNull BinaryMessenger messenger)
void	setKeyboardMethodHandler (@Nullable KeyboardMethodHandler keyboardMethodHandler)

Public Attributes
final MethodChannel	channel
final MethodChannel.MethodCallHandler	parsingMethodHandler

Detailed Description

Event message channel for keyboard events to/from the Flutter framework.

Receives asynchronous messages from the framework to query the engine known pressed state.

Definition at line 21 of file KeyboardChannel.java.

Constructor & Destructor Documentation

KeyboardChannel()

io.flutter.embedding.engine.systemchannels.KeyboardChannel.KeyboardChannel ( @NonNull BinaryMessenger  messenger )

inline

Definition at line 54 of file KeyboardChannel.java.

                                                             {
    channel = new MethodChannel(messenger, "flutter/keyboard", StandardMethodCodec.INSTANCE);
    channel.setMethodCallHandler(parsingMethodHandler);
  }

Member Function Documentation

setKeyboardMethodHandler()

void io.flutter.embedding.engine.systemchannels.KeyboardChannel.setKeyboardMethodHandler ( @Nullable KeyboardMethodHandler  keyboardMethodHandler )

inline

Sets the KeyboardMethodHandler which receives all requests to query the keyboard state.

Definition at line 62 of file KeyboardChannel.java.

                                                                                              {
    this.keyboardMethodHandler = keyboardMethodHandler;
  }

Member Data Documentation

channel

final MethodChannel io.flutter.embedding.engine.systemchannels.KeyboardChannel.channel

Definition at line 22 of file KeyboardChannel.java.

parsingMethodHandler

final MethodChannel.MethodCallHandler io.flutter.embedding.engine.systemchannels.KeyboardChannel.parsingMethodHandler

Initial value:

=
      new MethodChannel.MethodCallHandler() {
        Map<Long, Long> pressedState = new HashMap<>();
 
        @Override
        public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
          if (keyboardMethodHandler == null) {
            
            
            result.success(pressedState);
          } else {
            switch (call.method) {
              case "getKeyboardState":
                try {
                  pressedState = keyboardMethodHandler.getKeyboardState();
                } catch (IllegalStateException exception) {
                  result.error("error", exception.getMessage(), null);
                }
                result.success(pressedState);
                break;
              default:
                result.notImplemented();
                break;
            }
          }
        }
      }

Definition at line 26 of file KeyboardChannel.java.

                                            {
        Map<Long, Long> pressedState = new HashMap<>();
 
        @Override
        public void onMethodCall(@NonNull MethodCall call, @NonNull MethodChannel.Result result) {
          if (keyboardMethodHandler == null) {
            // Returns an empty pressed state when the engine did not get a chance to register
            // a method handler for this channel.
            result.success(pressedState);
          } else {
            switch (call.method) {
              case "getKeyboardState":
                try {
                  pressedState = keyboardMethodHandler.getKeyboardState();
                } catch (IllegalStateException exception) {
                  result.error("error", exception.getMessage(), null);
                }
                result.success(pressedState);
                break;
              default:
                result.notImplemented();
                break;
            }
          }
        }
      };

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The documentation for this class was generated from the following file:

• shell/platform/android/io/flutter/embedding/engine/systemchannels/KeyboardChannel.java