Hide navigation bar?

[dtmr]

Is there a way? For Android 4 upwards (= Android without navigation by gestures)?

[svan]

Not sure what code you are running, but there is no action bar by default.

[dtmr]

The question was about the navigation bar.

[jafal]

Hi

Some information

Processing 2.x and 3.x Forum

Hide the navigation bar  |  Android Developers

Completely hiding navigation bar (not only buttons) in android

Android: Removing the Navigation Bar in Android 11 using Java

[dtmr]

I’ve already been down the Google road. I couldn’t get anything to work. I didn’t bother to try the solutions for higher Android versions since I need one for Android 4 and upwards. Does nobody have working Processing code?

[svan]

Are you able to run the following:

void setup() {
  fullScreen();
  background(209);
  fill(0, 255, 0);
  rect(200,200,400,400);
}

void draw() {  
}

There are no bars on my Android system.

Are you running your code in the Processing IDE or some other editor?

[dtmr]

Thanks, that was very helpful. Your test app has no navigation bar but mine has. It turns out I must have fullScreen() in the settings() function, if there is a settings() function, and I can not even have an if condition around it, like:

if (TARGET_ANDROID)
{
    fullScreen();
}

One problem remains: When calling up the keyboard, the navbar comes back but won’t disappear after the keyboard has been closed.

[shedMusic]

You might have to call hideSystemUI()

Have a look at the code near the end of this thread

Immersive mode broken?

Hi Just upgrade my phone from 7.1 to 8.1 and seem to have lost immersive mode … bottom menu bar is permanently visible, I recall that immersive was set to be default behaviour for Android mode a year or so ago … or maybe even longer than that… but does this need updating for the latest android versions? Or… can some one provide a code snippet that would let me set immersive mode myself? Many thanks Mark EDIT: Just managed to get it working in Android Studio by pasting the code below into …

[dtmr]

Bugs observed since adding fullScreen():

• On my Android 9 SamsungS8+ phone, fullScreen() makes the navigation buttons disappear but not the bar behind them. The bar is always displayed and obscures a part of my app.

• On my Android 6 Huawei M10 8.0 tablet, fullScreen() makes the navigation buttons/bar disappear but only until the soft keyboard is displayed. Then they come back and stay for good, even after the keyboard is closed. Additionaly, every 1-2 minute, I see a flicker on the screen. I recorded that with a camera to discover more and it turns out that for a fraction of a second, the screen content of my app is shifted down by ~1cm?!

• On my OS Galaxy Tab 10 with Lineage OS 17 (= Android 10), fullScreen() has no issues.

So unfortunately, this is not a workable solution. I use Processing 3 and Android mode 4.1.1 but I tried Processing 4.3 and the latest Android mode, too, without a better result.

You might have to call hideSystemUI()

My installation does not seem to know the constants (only tried this with Processing 3). I defined them myself but it seems hideSystemUI() never gets called after closing the keyboard with the back button.

import android.view.View;

final int SYSTEM_UI_FLAG_IMMERSIVE              = 2048 ;
final int SYSTEM_UI_FLAG_LAYOUT_STABLE          = 256;
final int SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION = 512 ;
final int SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN      = 1024 ;
final int SYSTEM_UI_FLAG_HIDE_NAVIGATION        = 2;
final int SYSTEM_UI_FLAG_FULLSCREEN             = 4;

// for Android, comment out under Java

public void
onWindowFocusChanged(boolean hasFocus)
{
    this.getActivity().onWindowFocusChanged(hasFocus);
    
    if (hasFocus)
    
        hideSystemUI();
}

private void
hideSystemUI()
{
    // Enables regular immersive mode. For "lean back" mode, remove SYSTEM_UI_FLAG_IMMERSIVE. Or for "sticky immersive," replace it with SYSTEM_UI_FLAG_IMMERSIVE_STICKY
    
    View decorView = getActivity().getWindow().getDecorView();

    decorView.setSystemUiVisibility
    (
            SYSTEM_UI_FLAG_IMMERSIVE
            // Set the content to appear under the system bars so that the content doesn't resize when the system bars hide and show.
            | SYSTEM_UI_FLAG_LAYOUT_STABLE
            | SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
            | SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
            // Hide the nav bar and status bar
            | SYSTEM_UI_FLAG_HIDE_NAVIGATION
            | SYSTEM_UI_FLAG_FULLSCREEN
    );
    
    println("called");
}

[shedMusic]

@dtmr

I had forgotten about this, but that code is old … deprecated a few years back … this link explains …

• kotlin - android.view.View.systemUiVisibility deprecated. What is the replacement? - Stack Overflow

This code seems to work …

import android.view.*;
import android.os.Build;

void settings() {
  fullScreen() ;
}

void setup() {
}

void draw() {
}

void mousePressed() {
  openKeyboard() ;
}

public void
  onWindowFocusChanged(boolean hasFocus)
{
  getActivity().onWindowFocusChanged(hasFocus);
  if (hasFocus)
    hideSystemUI();
}

private void
  hideSystemUI()
{
  if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.R) { //api 30 & higher
    final WindowInsetsController controller = getWindow().getInsetsController();
    if (controller != null)
      controller.hide(WindowInsets.Type.statusBars());
  } else {
    //use old method ?
    //View decorView = getWindow().getDecorView();
    //decorView.setSystemUiVisibility(
    //        View.SYSTEM_UI_FLAG_IMMERSIVE
    //                // Set the content to appear under the system bars so that the
    //                // content doesn't resize when the system bars hide and show.
    //                | View.SYSTEM_UI_FLAG_LAYOUT_STABLE
    //                | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
    //                | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
    //                // Hide the nav bar and status bar
    //                | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
    //                | View.SYSTEM_UI_FLAG_FULLSCREEN);
  }
}

[dtmr]

depreceated

Just depreceated or not working anymore? I was looking for a solution for Android 4 and upwards and I’m using an older processing (3.4 from 2018) and an older Android mode (4.1.l) from that time.

• I have SDK for API Level 28 (Android 9.0). I think the SDK was installed via Android Studio (I don’t remember how I installed it and why exactly API level 28). Is that why I don’t have View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION etc.? Does Google remove depreceated symbols? Compile error: “The primitive type int of View does not have a field SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION”

• Why does it appear as if onWindowFocusChanged() is never called?

public void
onWindowFocusChanged(boolean hasFocus)
{
    getActivity().onWindowFocusChanged(hasFocus);

    println("called");
}

I never see “called” in the console. If I use surfaceWindowFocusChanged() instead of onWindowFocusChanged(), I get calls but not in the context of showing/hiding the keyboard, only upon start and upon exit.

[shedMusic]

@dtmr

I don’t know the answers … I just post code that I have been able to use, although this is using the processing library in Android Studio. When I try with Processing I get the same as you. I suspect that Processing’s Android Mode isn’t using some recent updates & requirements related to this. Perhaps raise a GitHub issue asking for fixes to this? I will play a bit more and post if I find anything.

[Mauro]

Hello shedMusic.
Many thanks for your suggestion. On my redmi 13 the code works fine!!!

Mauro

[shedMusic]

That’s great to hear …