How to make flutter app draw behind android navigation bar and make navigation bar fully transparent?

Question

I would like to make my Flutter app take up the entire screen in Android while still showing both the status bar and the navigation bar, with both of them transparent, to achieve the full screen look like in iOS.

The status bar color can be easily changed, but right now I'm facing problems with getting the app to fill up the screen and making the navigation bar transparent at the same time.

By default, the app is not drawn below the navigation bar at all (I've set the status bar color to be transparent):

Here are some solutions I've tried:

1) Setting flags on window in the onCreate function in MainActivity

Solution taken from here: https://stackoverflow.com/a/31596735

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
  window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, 
    WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS)
}

This sort of achieves what I want, but it has several problems. The padding and inset values in MediaQuery are now 0, so I have to manually get the status bar and nav bar heights through the use of MethodChannel. Furthermore, this creates a weird bug regarding the application switcher, as shown below (see how the content jumps and the debug banner on the top right is stretched):

2) Adding translucent navigation in styles.xml

<item name="android:windowTranslucentNavigation">true</item>

Result:

This is the closest to what I want to achieve. MediaQuery.of(context).padding.top correctly shows the top padding, and MediaQuery.of(context).viewInsets.bottom correctly shows the height of the navbar. There are no weird bugs in the application switcher as well. The only problem is that the navbar is translucent and not transparent.

Here's the repo for the sample app shown above: https://github.com/CZX123/navbar

It would be nice if Flutter could provide this functionality out of the box. But it doesn't, so are there any other better ways to achieve this?

Update

It seems like we would have to wait for the Flutter team to officially implement this feature:
https://github.com/flutter/flutter/issues/40974
https://github.com/flutter/flutter/issues/34678

This comment also perfectly sums up the current behavior in Android: https://github.com/flutter/flutter/issues/34678#issuecomment-536028077

No, this is not what this about. This issue is about the actual system UI navigation (as introduced in Android Q) not rendering properly in Flutter. — Zee2
– Zee2, Commented Nov 7, 2020 at 1:17
Did you find any solution to make the system navigation bar transparent? — Jani
– Jani, Commented Feb 24, 2021 at 15:18

Tyler2P · Accepted Answer · 2021-10-27 08:09:06Z

32

After Flutter 2.5.0:

This works for me like charm!

Inside your main() paste the code below:

//Setting SysemUIOverlay
SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle(
    systemStatusBarContrastEnforced: true,
    systemNavigationBarColor: Colors.transparent,
    systemNavigationBarDividerColor: Colors.transparent,
    systemNavigationBarIconBrightness: Brightness.dark,
    statusBarIconBrightness: Brightness.dark)
);
    
//Setting SystmeUIMode
SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge, overlays: [SystemUiOverlay.top]);

edited Oct 27, 2021 at 8:09

Tyler2P

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answered Oct 26, 2021 at 11:05

Yash Pathak

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2 Comments

bqubique Over a year ago

This should be selected as the answer to this question!

Raphael Pinel Nov 7 at 7:15

Yes, this should be the selected answer, as edge to edge mode is now the default from Android 15 (APK 35) forward

Mohammed Alfateh · Accepted Answer · 2022-10-23 21:40:19Z

9

There is a simple way to get around this using flutter natively on android SDK 29 and later without having to edit any other source file.

spoiler : instead of `Colors.transparent` use any color with `0.002` Opacity.

firstly you need to set the SystemUiMode to fullscreen display with status and navigation elements rendered over the application.

SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge);

Then set the color of the navigation bar in setSystemUIOverlayStyle to any color with opacity of 0.002 (It's the minimum value you can use)

  SystemChrome.setSystemUIOverlayStyle(
    SystemUiOverlayStyle(
      systemNavigationBarColor: Colors.black.withOpacity(0.002),
    ),
  );

the result :

If you focus too hard, you may notice a slight color difference, however you can go further and set the navigation bar color to the background color and you won't notice any difference.

I use a global function to set it when changing the app theme

void setSystemUIOverlayStyle(final Color color) {
  SystemChrome.setSystemUIOverlayStyle(
    SystemUiOverlayStyle(
      systemNavigationBarColor: color.withOpacity(0.002),
    ),
  );
}

I don't know what is the issue with the transparent color but if the color is nearly transparent then everything will work fine.

edited Oct 23, 2022 at 21:40

answered Sep 4, 2022 at 9:26

Mohammed Alfateh

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3 Comments

Umar Over a year ago

it will glith if you wanna use dialog... we need the dialog overlay are covered entire screen

Mohammed Alfateh Over a year ago

@Umar No, it works as expected with dialog/overlay, just don't use SafeArea

Umar Over a year ago

btw i just leaved flutter for now cause laggy, janky animation issue, i switched to native with jetpack compose

Abdur Rafay Saleem · Accepted Answer · 2021-04-09 09:53:56Z

I achieved the transparency effect throughout my app easily by editing the following files

1.Add the following lines in android/app/build.gradle

dependencies {
    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
    implementation 'androidx.core:core-ktx:1.5.0-beta01' //add this line
}

2.Add the following in your android/app/src/main/kotlin/com/<your_domain>/<your_project_name>/MainActivity.kt

import androidx.core.view.WindowCompat //add this line
import io.flutter.embedding.android.FlutterActivity

class MainActivity: FlutterActivity() {
    //add the following block of code
    override fun onPostResume() {
        super.onPostResume()
        WindowCompat.setDecorFitsSystemWindows(window, false)
        window.navigationBarColor = 0 //for transparent nav bar
        window.statusBarColor = 0 //for transparent status bar
    }
}

Remove SystemChrome.setSystemUIOverlayStyle commands from your main.dart
Run flutter clean and re run your app.

NOTE:

In case you nest a stack direct under the scaffold for some screen, you might see your app drawing above nav bar. To fix that just set the following property on scaffold

resizeToAvoidBottomInset: false
If you use an appbar or safeArea you might need to override the SystemUIOverlayStyle again using AnnotatedRegion

kevlatus · Accepted Answer · 2021-04-05 20:01:17Z

2

Though I don't know, which side effects this approach might cause, I believe it offers a solution to your question:

Scaffold(
  primary: false,
  appBar: AppBar(
    primary: false,
    // ...
  ),
  // ...
)

Setting both the Scaffold's and the AppBar's primary property to false removes their inner SafeArea, which renders them behind system UI.

answered Apr 5, 2021 at 20:01

kevlatus

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Comments

Punpuf · Accepted Answer · 2021-04-08 18:12:35Z

2

The following worked for me:

build.gradle (app)

implementation 'androidx.core:core-ktx:1.5.0-rc01'

MainActivity.kt

class MainActivity: FlutterActivity() {

    override fun onPostResume() {
        super.onPostResume()
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            WindowCompat.setDecorFitsSystemWindows(window, false)
            window.navigationBarColor = 0
        }
    }
}

main.dart

void main() {
  SystemChrome.setSystemUIOverlayStyle(SystemUiOverlayStyle.dark.copyWith(
    systemNavigationBarColor: Colors.transparent,
    statusBarColor: Colors.transparent,
  ));
  runApp(MyApp());
}

Inspiration came from https://github.com/flutter/flutter/issues/40974

answered Apr 8, 2021 at 18:12

Punpuf

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2 Comments

Dheeraj Rijhwani Over a year ago

Updating build.gradle and MainActivity worked for me.

Umar Over a year ago

error FlutterError (No MaterialLocalizations found. on i added dialog

Umar · Accepted Answer · 2024-03-22 15:37:43Z

1

as last flutter 3.19.x

your code main activity its worked for me and the MediaQuery have excact value not 0, tested in android 14

if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT) {
  window.setFlags(WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS, 
    WindowManager.LayoutParams.FLAG_LAYOUT_NO_LIMITS)
}

answered Mar 22, 2024 at 15:37

Umar

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Comments

raugfer · Accepted Answer · 2023-12-05 16:28:39Z

0

This is what I have been using on my main screen widget:

1 - To extend the app area over the navigation bar

  @override
  void initState() {
    super.initState();
    SystemChrome.setEnabledSystemUIMode(SystemUiMode.manual, overlays: [SystemUiOverlay.top]);
  }

2 - To make both the status and navigation bars transparent according to the current theme brightness:

  @override
  Widget build(BuildContext context) {
    Brightness currentBrightness = Theme.of(context).brightness;
    Brightness oppositeBrightness = currentBrightness == Brightness.light ? Brightness.dark : Brightness.light;
    return Scaffold(
      appBar: AppBar(
        systemOverlayStyle: SystemUiOverlayStyle(
          statusBarColor: Colors.transparent,
          statusBarBrightness: currentBrightness,
          statusBarIconBrightness: oppositeBrightness,
          systemNavigationBarColor: Colors.transparent,
          systemNavigationBarIconBrightness: oppositeBrightness,
        ),
        /* ... */
      ),
      /* ... */
    );
  }

edited Dec 5, 2023 at 16:28

answered Dec 5, 2023 at 15:25

raugfer

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1 Comment

Umar Over a year ago

does it from 1 to 2 or choose one?

Umar · Accepted Answer · 2024-03-23 07:07:23Z

0

Just enable edge to edge screen

SystemChrome.setEnabledSystemUIMode(SystemUiMode.edgeToEdge); // Enable Edge-to-Edge on Android 10+
    SystemChrome.setSystemUIOverlayStyle(const SystemUiOverlayStyle(
      systemNavigationBarColor: Colors.transparent, // Setting a transparent navigation bar color
    ));

answered Mar 23, 2024 at 7:07

Umar

4655 silver badges14 bronze badges

Comments

user13374179 · Accepted Answer · 2020-04-26 12:56:21Z

-1

So if you are using Flutter the procedure is:

Set AppBar() color to transparent.
Set extendBeyondAppBar to true.
Set elevation to 0.

As an example:

    return Scaffold(
        extendBodyBehindAppBar: true,
        appBar: AppBar(
           elevation: 0,
           )

answered Apr 26, 2020 at 12:56

user13374179

2 Comments

joharei Over a year ago

This is not about the navigation bar.

Zee2 Over a year ago

This is not the correct answer. This is about the modern Android behavior where a small gesture navigation bar is drawn over the app.

Z. Cajurao · Accepted Answer · 2019-11-13 01:38:52Z

-4

return Scaffold(
   body: AnnotatedRegion<SystemUiOverlayStyle>(
    value: SystemUiOverlayStyle(
      statusBarColor: Colors.transparent,
      systemNavigationBarColor: Colors.transparent
    ),
    sized: false,
    child: Container(color: Colors.red)
  )
);

edited Nov 13, 2019 at 1:38

answered Nov 11, 2019 at 7:59

Z. Cajurao

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Comments

dlohani · Accepted Answer · 2019-12-30 11:11:47Z

-4

This might be late, but the latest version for flutter, 1.12 provides a feature to draw the app behind the NavigationBar, so the following code will have the transparent navigation bar with app fully extended behind the navigation bar,

Scaffold(
  extendBodyBehindAppBar: true, //this ensures that the body is drawn behind the navigation bar as well
  appBar: AppBar(
    backgroundColor: Colors.transparent,
    title: Text('Transparent Bar'),
  ),
  body: Container(
    color: Colors.blue,
  ),
);

answered Dec 30, 2019 at 11:11

dlohani

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1 Comment

Rustem Kakimov Over a year ago

only works for AppBar, doesn't extend behind system navigation

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How to make flutter app draw behind android navigation bar and make navigation bar fully transparent?

1) Setting flags on window in the onCreate function in MainActivity

2) Adding translucent navigation in styles.xml

Update

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1) Setting flags on window in the onCreate function in MainActivity

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spoiler : instead of Colors.transparent use any color with 0.002 Opacity.

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spoiler : instead of `Colors.transparent` use any color with `0.002` Opacity.