JavaFX Android端口侦听音量按钮按下

Question

我正试图用JavaFX开发一个安卓应用程序。有没有办法在我的手机上监听音量按钮，以便每当我按音量按钮时就可以启动一些代码？

Answer 1

您可以监听各种密钥代码，例如：

• KeyCode.ESCAPE ==后退按钮
• KeyCode.VOLUME_UP / KeyCode.VOLUME_DOWN
• KeyCode.HOME -我不确定，还没测试过
• KeyCode.CONTEXT_MENU -我不确定，还没测试过

在您的应用程序扩展主类中，您可以这样做：

@Override
public void start(Stage stage) throws Exception {
    // init scene and UI
    scene.addEventFilter(KeyEvent.ANY, this::handleGlobalKeyEvents);
    // do whatever you want
}

private void handleGlobalKeyEvents(KeyEvent event) {
    // use a more specific key event type like
    // --> KeyEvent.KEY_RELEASED == event.getEventType()
    // --> KeyEvent.KEY_PRESSED == event.getEventType()
    // without it, we would react on both events, thus doing one operation too much
    if (event.getCode().equals(KeyCode.ESCAPE) && KeyEvent.KEY_RELEASED == event.getEventType()) {
        if (backHandler != null)
            backHandler.back();
        event.consume();
    }
}

你好，丹尼尔