Capture external keyboard keys or remote control button events
Learn about Android KeyEvent here.
Run npm install react-native-keyevent --save
Run yarn add react-native-keyevent
react-native link react-native-keyevent (for React Native <= 0.59 only)
pod install inside your ios folder.
Note: You still must manually register module in MainActivity! (Instructions below under Configuration Android)
Android
-
In
android/setting.gradle... include ':react-native-keyevent' project(':react-native-keyevent').projectDir = new File(rootProject.projectDir, '../node_modules/react-native-keyevent/android') -
In
android/app/build.gradle... dependencies { ... compile project(':react-native-keyevent') } -
Register module (in MainApplication.java)
import com.github.kevinejohn.keyevent.KeyEventPackage; // <--- import public class MainApplication extends Application implements ReactApplication { ...... @Override protected List<ReactPackage> getPackages() { return Arrays.<ReactPackage>asList( new MainReactPackage(), new KeyEventPackage() <------- Add this ); } ...... }
iOS
Follow the instrutions listed here: Manually Linking iOS.
Implement onConfigurationChanged method in MainActivity.java
import android.view.KeyEvent; // <--- import
import com.github.kevinejohn.keyevent.KeyEventModule; // <--- import
public class MainActivity extends ReactActivity {
......
@Override // <--- Add this method if you want to react to keyDown
public boolean onKeyDown(int keyCode, KeyEvent event) {
// A. Prevent multiple events on long button press
// In the default behavior multiple events are fired if a button
// is pressed for a while. You can prevent this behavior if you
// forward only the first event:
// if (event.getRepeatCount() == 0) {
// KeyEventModule.getInstance().onKeyDownEvent(keyCode, event);
// }
//
// B. If multiple Events shall be fired when the button is pressed
// for a while use this code:
// KeyEventModule.getInstance().onKeyDownEvent(keyCode, event);
//
// Using B.
KeyEventModule.getInstance().onKeyDownEvent(keyCode, event);
// There are 2 ways this can be done:
// 1. Override the default keyboard event behavior
// super.onKeyDown(keyCode, event);
// return true;
// 2. Keep default keyboard event behavior
// return super.onKeyDown(keyCode, event);
// Using method #1 without blocking multiple
super.onKeyDown(keyCode, event);
return true;
}
@Override // <--- Add this method if you want to react to keyUp
public boolean onKeyUp(int keyCode, KeyEvent event) {
KeyEventModule.getInstance().onKeyUpEvent(keyCode, event);
// There are 2 ways this can be done:
// 1. Override the default keyboard event behavior
// super.onKeyUp(keyCode, event);
// return true;
// 2. Keep default keyboard event behavior
// return super.onKeyUp(keyCode, event);
// Using method #1
super.onKeyUp(keyCode, event);
return true;
}
@Override
public boolean onKeyMultiple(int keyCode, int repeatCount, KeyEvent event) {
KeyEventModule.getInstance().onKeyMultipleEvent(keyCode, repeatCount, event);
return super.onKeyMultiple(keyCode, repeatCount, event);
}
......
}
This will need to be added in your AppDelegate.m file:
// react-native-keyevent
#import <RNKeyEvent.h> // import our package after linking
@implementation AppDelegate
//....
/*!
* react-native-keyevent support
*/
RNKeyEvent *keyEvent = nil;
- (NSMutableArray<UIKeyCommand *> *)keyCommands {
NSMutableArray *keys = [NSMutableArray new];
if (keyEvent == nil) {
keyEvent = [[RNKeyEvent alloc] init];
}
if ([keyEvent isListening]) {
NSArray *namesArray = [[keyEvent getKeys] componentsSeparatedByString:@","];
NSCharacterSet *validChars = [NSCharacterSet characterSetWithCharactersInString:@"ABCDEFGHIJKLMNOPQRSTUVWXYZ"];
for (NSString* names in namesArray) {
NSRange range = [names rangeOfCharacterFromSet:validChars];
if (NSNotFound != range.location) {
[keys addObject: [UIKeyCommand keyCommandWithInput:names modifierFlags:UIKeyModifierShift action:@selector(keyInput:)]];
} else {
[keys addObject: [UIKeyCommand keyCommandWithInput:names modifierFlags:0 action:@selector(keyInput:)]];
}
}
}
return keys;
}
- (void)keyInput:(UIKeyCommand *)sender {
NSString *selected = sender.input;
[keyEvent sendKeyEvent:selected];
}
@endWhenever you want to use it within React Native code now you can:
import KeyEvent from 'react-native-keyevent';
componentDidMount() {
// if you want to react to keyDown
KeyEvent.onKeyDownListener((keyEvent) => {
console.log(`onKeyDown keyCode: ${keyEvent.keyCode}`);
console.log(`Action: ${keyEvent.action}`);
console.log(`Key: ${keyEvent.pressedKey}`);
});
// if you want to react to keyUp
KeyEvent.onKeyUpListener((keyEvent) => {
console.log(`onKeyUp keyCode: ${keyEvent.keyCode}`);
console.log(`Action: ${keyEvent.action}`);
console.log(`Key: ${keyEvent.pressedKey}`);
});
// if you want to react to keyMultiple
KeyEvent.onKeyMultipleListener((keyEvent) => {
console.log(`onKeyMultiple keyCode: ${keyEvent.keyCode}`);
console.log(`Action: ${keyEvent.action}`);
console.log(`Characters: ${keyEvent.characters}`);
});
}
componentWillUnmount() {
// if you are listening to keyDown
KeyEvent.removeKeyDownListener();
// if you are listening to keyUp
KeyEvent.removeKeyUpListener();
// if you are listening to keyMultiple
KeyEvent.removeKeyMultipleListener();
}- iOS Support
- Add iOS Support for keyDown and multipleKeys
- Implement
keyCodeandactionon iOS - Support for TypeScript projects
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