react-native-navigation/lib/android/app/src/main/java/com/reactnativenavigation/react/JsDevReloadHandler.java

package com.reactnativenavigation.react;

import android.app.Activity;
import android.content.BroadcastReceiver;
import android.content.Context;
import android.content.Intent;
import android.content.IntentFilter;
import android.view.KeyEvent;

import com.facebook.react.devsupport.interfaces.DevSupportManager;
import com.reactnativenavigation.utils.UiUtils;

public class JsDevReloadHandler extends JsDevReloadHandlerFacade {
    private static final String RELOAD_BROADCAST = "com.reactnativenavigation.broadcast.RELOAD";

    public interface ReloadListener {
        void onReload();
    }

	private final BroadcastReceiver reloadReceiver = new BroadcastReceiver() {
		@Override
		public void onReceive(final Context context, final Intent intent) {
			reloadReactNative();
		}
	};
    private final DevSupportManager devSupportManager;

    private long firstRTimestamp = 0;
    private ReloadListener reloadListener = () -> {};

    JsDevReloadHandler(DevSupportManager devSupportManager) {
        this.devSupportManager = devSupportManager;
    }

    @Override
    public void onSuccess() {
        UiUtils.runOnMainThread(reloadListener::onReload);
    }

    public void setReloadListener(ReloadListener listener) {
        reloadListener = listener;
    }

    public void removeReloadListener(ReloadListener listener) {
        if (reloadListener == listener) {
            reloadListener = null;
        }
    }

	public void onActivityResumed(Activity activity) {
		activity.registerReceiver(reloadReceiver, new IntentFilter(RELOAD_BROADCAST));
	}

	public void onActivityPaused(Activity activity) {
		activity.unregisterReceiver(reloadReceiver);
	}

	public boolean onKeyUp(int keyCode) {
		if (!devSupportManager.getDevSupportEnabled()) {
			return false;
		}

		if (keyCode == KeyEvent.KEYCODE_MENU) {
			devSupportManager.showDevOptionsDialog();
			return true;
		}

		if (keyCode == KeyEvent.KEYCODE_R) {
			if (lessThan500MillisSinceLastR()) {
				reloadReactNative();
				return true;
			}
			firstRTimestamp = System.currentTimeMillis();
		}
		return false;
	}

	private boolean lessThan500MillisSinceLastR() {
		return firstRTimestamp != 0 && System.currentTimeMillis() - firstRTimestamp < 1000;
	}

	private void reloadReactNative() {
        reloadListener.onReload();
		devSupportManager.handleReloadJS();
	}
}