react-native-navigation/android/app/src/main/java/com/reactnativenavigation/controllers/NavigationActivity.java

package com.reactnativenavigation.controllers;

import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.view.KeyEvent;
import android.view.View;

import com.facebook.react.modules.core.DefaultHardwareBackBtnHandler;
import com.reactnativenavigation.NavigationApplication;
import com.reactnativenavigation.layouts.Layout;
import com.reactnativenavigation.layouts.LayoutFactory;
import com.reactnativenavigation.params.ActivityParams;
import com.reactnativenavigation.params.ScreenParams;
import com.reactnativenavigation.params.TitleBarButtonParams;
import com.reactnativenavigation.react.JsDevReloadHandler;
import com.reactnativenavigation.react.NavigationReactInstance;
import com.reactnativenavigation.react.RedboxPermission;

import java.util.List;

public class NavigationActivity extends AppCompatActivity implements DefaultHardwareBackBtnHandler, NavigationReactInstance.OnJsDevReloadListener {

    /**
     * Although we start multiple activities, we make sure to pass Intent.CLEAR_TASK | Intent.NEW_TASK
     * So that we actually have only 1 instance of the activity running at one time.
     * We hold the currentActivity (resume->pause) so we know when we need to destroy the javascript context
     * (when currentActivity is null, ie pause and destroy was called without resume).
     * This is somewhat weird, and in the future we better use a single activity with changing contentView similar to ReactNative impl.
     * Along with that, we should handle commands from the bridge using onNewIntent
     */
    static NavigationActivity currentActivity;

    private ActivityParams activityParams;
    private ModalController modalController;
    private Layout layout;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        RedboxPermission.permissionToShowRedboxIfNeeded(this);

        activityParams = NavigationCommandsHandler.getActivityParams(getIntent());

        createLayout();
        createModalController();
    }

    private void createModalController() {
        modalController = new ModalController(this);
    }

    private void createLayout() {
        layout = LayoutFactory.create(this, activityParams);
        setContentView((View) layout);
    }

    @Override
    protected void onResume() {
        super.onResume();
        currentActivity = this;
        getNavigationReactInstance().onResume(this, this, this);
    }

    @Override
    protected void onPause() {
        super.onPause();
        currentActivity = null;
        getNavigationReactInstance().onPause();
    }

    @Override
    protected void onDestroy() {
        modalController.onDestroy();
        layout.onDestroy();
        super.onDestroy();
        if (currentActivity == null || currentActivity.isFinishing()) {
            getNavigationReactInstance().onHostDestroy();
        }
    }

    @Override
    public void onJsDevReload() {
        layout.removeAllReactViews();
    }

    @Override
    public void invokeDefaultOnBackPressed() {
        super.onBackPressed();
    }

    @Override
    public void onBackPressed() {
        if (modalController.onBackPressed()) {
            return;
        }
        if (layout.onBackPressed()) {
            return;
        }
        getNavigationReactInstance().onBackPressed();
    }

    @Override
    public void onActivityResult(int requestCode, int resultCode, Intent data) {
        getNavigationReactInstance().onActivityResult(requestCode, resultCode, data);
    }

    @Override
    public boolean onKeyUp(int keyCode, KeyEvent event) {
        return JsDevReloadHandler.onKeyUp(getCurrentFocus(), keyCode) || super.onKeyUp(keyCode, event);
    }

    private NavigationReactInstance getNavigationReactInstance() {
        return NavigationApplication.instance.getNavigationReactInstance();
    }

    void push(ScreenParams params) {
        layout.push(params);
    }

    void pop(ScreenParams params) {
        layout.pop(params);
    }

    void popToRoot(ScreenParams params) {
        layout.popToRoot(params);
    }

    void newStack(ScreenParams params) {
        layout.newStack(params);
    }

    void setTopBarVisible(String screenInstanceId, boolean hidden, boolean animated) {
        layout.setTopBarVisible(screenInstanceId, hidden, animated);
    }

    void setTitleBarTitle(String screenInstanceId, String title) {
        layout.setTitleBarTitle(screenInstanceId, title);
    }

    public void setTitleBarButtons(String screenInstanceId, String navigatorEventId, List<TitleBarButtonParams> titleBarButtons) {
        layout.setTitleBarButtons(screenInstanceId, navigatorEventId, titleBarButtons);
    }

    void showModal(ScreenParams screenParams) {
        modalController.showModal(screenParams);
    }
}