Develop Reference

Android bottom navigation appears when pressing on Flutter bottom navigation bar

I'm using SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.top]);
to only display the top system overlay (Where you normally see time and notifications) and disable bottom navigation of the device (3 buttons in android or slider in IOS).
Problem is that when I try to press the Bottom Navigation Bar of my Flutter application, it automatically activates the bottom bar of the system, blocking out the bottom navigation bar of the app.
Resizing the app is not suitable for me. I don't want this to happen, and system navigation should only appear when user slides from the bottom.
Help is appreciated.

Can you share your code so that I can have a better Idea,
// to hide only bottom bar:
SystemChrome.setEnabledSystemUIOverlays ([SystemUiOverlay.top]);
// to hide only status bar:
SystemChrome.setEnabledSystemUIOverlays ([SystemUiOverlay.bottom]);
// to hide both:
SystemChrome.setEnabledSystemUIOverlays ([]);
//to bring them back:
SystemChrome.setEnabledSystemUIOverlays(SystemUiOverlay.values)
Implement the in your code and it should work.

Hiding default navigation bar in app on Android devices

Currently working on a fullscreen mobile app, building using react-native. I have managed to hide the status bar and default navigation bar on Android devices. However, when I start to put in text input tags that prompts a keyboard on the screen, the default navigation bar re-appears and could not be hidden even I've dismissed the keyboard.
Is there any way to prevent the default navigation bar re-appears when the keyboard pops up?
The reasons are that I need to remove the navigation bar to have enough space to locate the needed components on the app UI design. If the navigation bar re-appears the design will be messed up. Thank you for any advice.

I think this is what you're looking for:
static navigationOptions = {
header: null,
};
Put this on top of each screen

Hide Android Navigator shows a border

Im using react native navigation V1 and i set my nav bar transparent to true, in my IOS emulator looks good but in Android emulator show me something like a border, and i don't know how hide or remove this section.
//add this to change top bar navigator.
navigatorStyle: {
drawUnderNavBar: true,
navBarTranslucent: true,
navBarTransparent: true,
navBarBackgroundColor: 'transparent',
},
Example how looks in Android

How to hide android's bottom navigation bar in flutter

I'm really new in flutter and also in Android dev, but is it possible to hide the bottom navigation bar (see which item do i mean below) programmatically?

Try this:
SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.top]);
Document

For specifies the set of system overlays to have visible when the application
is running. you can use below static method:
SystemChrome.setEnabledSystemUIOverlays(List<SystemUiOverlay> overlays)
Examples :
1 - For Hide bottom navigation bar and Still Status bar visible
SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.top]);
2 - For Still bottom navigation visible bar and Hide Status bar
SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.bottom]);
3 - For hide both bottom Navigation and Status bar
SystemChrome.setEnabledSystemUIOverlays([]);
4 - For make both visible
SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.top, SystemUiOverlay.bottom]);

At the time of writing this answer all of the other posts here are outdated, using setEnabledSystemUIOverlays will give a deprecation message.
To hide the system navigation bar or status bar import:
import 'package:flutter/services.dart';
And use the service SystemChrome.setEnabledSystemUIMode
SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky);
The function setEnabledSystemUIMode receives the SystemUiMode Enum which has the following options:
leanBack - Fullscreen display with status and navigation bars presentable by tapping anywhere on the display.
immersive - Fullscreen display with status and navigation bars presentable through a swipe gesture at the edges of the display.
immersiveSticky - Fullscreen display with status and navigation bars presentable temporarly through a swipe gesture at the edges of the display.
edgeToEdge - Fullscreen display with status and navigation elements rendered over the application.
manual - Declares manually configured [SystemUiOverlay]s. (look at the docs for more information)

Use SystemChrome.setEnabledSystemUIOverlays([]) to hide the status bar and the navigation bar.

I think you can use this
SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: [SystemUiOverlay.top]);
in your initState()

Currently this feature is bugged in flutter, you can see this issue here.
https://github.com/flutter/flutter/issues/62412
Normally you would need to do the following:
SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.top]);

This Approach is depreciated
SystemChrome.setEnabledSystemUIOverlays([SystemUiOverlay.top]);
To show the status bar only
SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky,overlays: [SystemUiOverlay.top]);
To show the system navigation bar only
SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky,overlays: [SystemUiOverlay.bottom]);
To hide both
SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky,
overlays: []);
It is better the put it before the runApp method like this
void main() {
WidgetsFlutterBinding.ensureInitialized();
SystemChrome.setEnabledSystemUIMode(SystemUiMode.immersiveSticky, overlays:[]).then(
(_) => runApp(MyApp()),
);
}

React Navigation transparent bar missing title and buttons on android

I'm building a React Native app with React Navigation 2.5.x. I have a transparent navigation bar. On iOS everything is fine, but on Android the title, back button and any barButton I put there is missing.
The navigation options is defined like this:
const navigationOptions = {
headerStyle: {
borderBottomWidth: 0,
},
headerTransparent: true,
headerTintColor: Colors.barTintColor,
};
If I try to inspect the view I get the header component when tapping, but on Android I get the scenes content view instead.
Previously I had the header style positioned absolutely and a transparent background color. I would like the bar to be transparent and visible above the rest of content screen. But positioning it absolutely, setting headerMode och headerTransparent all makes the headers disappear.
What am I doing wrong?