Android Tutorial Immersive Mode - hide the navigation bar

Thanks for this Erel, however there is a slight issue that 100%y is still fixed to the original size.
Obviously replacing 100%y with lv.Height resolves it (I have to store it, Activity.Height doesn't seem to adjust), it was just a gotcha for me

 

And indeed it does - thanks Erel!

 

Hi

randomly when i change activity the app crash , at line 162 i have

Code:

Sub Activity_WindowFocusChanged(HasFocus As Boolean)

log :

Code:

Error occurred on line: 162 (Main)
java.lang.NullPointerException: Attempt to read from field 'anywheresoftware.b4a.BA b4a.casa.tablet.main.activityBA' on a null object reference
    at b4a.casa.tablet.main._activity_windowfocuschanged(main.java:629)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.shell.Shell.runMethod(Shell.java:735)
    at anywheresoftware.b4a.shell.Shell.raiseEventImpl(Shell.java:357)
    at anywheresoftware.b4a.shell.Shell.raiseEvent(Shell.java:260)
    at java.lang.reflect.Method.invoke(Native Method)
    at anywheresoftware.b4a.ShellBA.raiseEvent2(ShellBA.java:144)
    at b4a.casa.tablet.main.onWindowFocusChanged(main.java:185)
    at com.android.internal.policy.DecorView.onWindowFocusChanged(DecorView.java:1451)
    at android.view.View.dispatchWindowFocusChanged(View.java:10258)
    at android.view.ViewGroup.dispatchWindowFocusChanged(ViewGroup.java:1193)
    at android.view.ViewRootImpl$ViewRootHandler.handleMessage(ViewRootImpl.java:3605)
    at android.os.Handler.dispatchMessage(Handler.java:102)
    at android.os.Looper.loop(Looper.java:154)
    at android.app.ActivityThread.main(ActivityThread.java:6119)
    at java.lang.reflect.Method.invoke(Native Method)
    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:886)
    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:776)

PS the errors seems happen only in debug mode

 

Can you teach us how to implement this in B4A ? (So that the immersive mode is complete)

https://developer.android.com/training/system-ui/visibility

 

I try to explain , when the app is into immersive mode :



if the user touch ed edge , the system bar reappears :




I need to intercept the change to let my code resize the layout , to do this i find from Google development site :

Code:

View decorView = getWindow().getDecorView();
decorView.setOnSystemUiVisibilityChangeListener
        (new View.OnSystemUiVisibilityChangeListener() {
    @Override
    public void onSystemUiVisibilityChange(int visibility) {
        // Note that system bars will only be "visible" if none of the
        // LOW_PROFILE, HIDE_NAVIGATION, or FULLSCREEN flags are set.
        if ((visibility & View.SYSTEM_UI_FLAG_FULLSCREEN) == 0) {
            // TODO: The system bars are visible. Make any desired
            // adjustments to your UI, such as showing the action bar or
            // other navigational controls.
        } else {
            // TODO: The system bars are NOT visible. Make any desired
            // adjustments to your UI, such as hiding the action bar or
            // other navigational controls.
        }
    }
});

but i can't make it works into B4A .

Any idea ?

Thanks

 

what's that Sleep(300) in Activity_WindowFocusChanged for?

 

there is also a mode where only!
the navigation bar (at the bottom)
is hidden.
so the status bar is always visible?

regards Frank

https://developer.android.com/training/system-ui/immersive#java