Immersive Mode showing blank space

问题

I'm trying to implement a fullscreen mode, but for Android 4.4 and up, it shows a blank space there:

BEFORE immersive mode(fullscreen)

and AFTER the toggleFullScreen(false);

as you can see, its doesn't remove it. Here's the code that I'm using to toggle it:

public void toggleFullscreen(boolean fs) {
        if (Build.VERSION.SDK_INT >= 11) {
            // The UI options currently enabled are represented by a bitfield.
            // getSystemUiVisibility() gives us that bitfield.
            int uiOptions = this.getWindow().getDecorView().getSystemUiVisibility();
            int newUiOptions = uiOptions;
            boolean isImmersiveModeEnabled =
                    ((uiOptions | View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY) == uiOptions);
            if (isImmersiveModeEnabled) {
                Log.i(getPackageName(), "Turning immersive mode mode off. ");
            } else {
                Log.i(getPackageName(), "Turning immersive mode mode on.");
            }

            // Navigation bar hiding:  Backwards compatible to ICS.
            if (Build.VERSION.SDK_INT >= 14) {
                newUiOptions ^= View.SYSTEM_UI_FLAG_HIDE_NAVIGATION;
            }

            // Status bar hiding: Backwards compatible to Jellybean
            if (Build.VERSION.SDK_INT >= 16) {
                newUiOptions ^= View.SYSTEM_UI_FLAG_FULLSCREEN;
            }

            // Immersive mode: Backward compatible to KitKat.
            // Note that this flag doesn't do anything by itself, it only augments the behavior
            // of HIDE_NAVIGATION and FLAG_FULLSCREEN.  For the purposes of this sample
            // all three flags are being toggled together.
            // Note that there are two immersive mode UI flags, one of which is referred to as "sticky".
            // Sticky immersive mode differs in that it makes the navigation and status bars
            // semi-transparent, and the UI flag does not get cleared when the user interacts with
            // the screen.
            if (Build.VERSION.SDK_INT >= 18) {
                newUiOptions ^= View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY;
            }
            getWindow().getDecorView().setSystemUiVisibility(newUiOptions);
        } else {
            // for android pre 11
            WindowManager.LayoutParams attrs = getWindow().getAttributes();
            if (fs) {
                attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN;
            } else {
                attrs.flags &= ~WindowManager.LayoutParams.FLAG_FULLSCREEN;
            }
            this.getWindow().setAttributes(attrs);
        }

        try {
            // hide actionbar
            if
                    (this instanceof AppCompatActivity) {
                if (fs) getSupportActionBar().hide();
                else getSupportActionBar().show();
            } else if
                    (Build.VERSION.SDK_INT >= 11) {
                if (fs) getActionBar().hide();
                else getActionBar().show();
            }
        } catch (Exception e) {
            e.printStackTrace();
        }
    }

回答1:

Please check that you don't have android:fitsSystemWindows="true" in your layout.

At least it solved my case - I had fitsSystemWindows on FrameLayout.

回答2:

I'm new here so I can't comment, but wanted to add something that got me so frustrated me about the above solution. I kept checking my activities and its fragments for android:fitsSystemWindows="true" and it was definitely not there, yet I kept having a gap at the bottom! I was going nuts! It couldn't be this hard to fix this simple thing!

Turns out it also showed up in the Navigation Drawer I added...so be sure to check all your XML!

回答3:

You need to add this flag to your view View.SYSTEM_UI_FLAG_LAYOUT_STABLE. Try it like this

// This snippet hides the system bars.
private void hideSystemUI() {
// Set the IMMERSIVE flag.
// Set the content to appear under the system bars so that the content
// doesn't resize when the system bars hide and show.
mDecorView.setSystemUiVisibility(
        View.SYSTEM_UI_FLAG_LAYOUT_STABLE
        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN
        | View.SYSTEM_UI_FLAG_HIDE_NAVIGATION // hide nav bar
        | View.SYSTEM_UI_FLAG_FULLSCREEN // hide status bar
        | View.SYSTEM_UI_FLAG_IMMERSIVE);
}

// This snippet shows the system bars. It does this by removing all the  flags
// except for the ones that make the content appear under the system bars.
private void showSystemUI() {
mDecorView.setSystemUiVisibility(
        View.SYSTEM_UI_FLAG_LAYOUT_STABLE
        | View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION
        | View.SYSTEM_UI_FLAG_LAYOUT_FULLSCREEN);
}

回答4:

Try this:

override fun onActivityCreated(savedInstanceState: Bundle?) {
    super.onActivityCreated(savedInstanceState)
    var viewParent = view
    while (viewParent is View) {
        viewParent.fitsSystemWindows = false
        viewParent.setOnApplyWindowInsetsListener { _, insets -> insets }
        viewParent = viewParent.parent as View?
    }
}

What does this do? DialogFragment#onActivityCreated() calls Dialog#setContentView(), which wraps the Dialog's view in a private 'wrapInBottomSheet'. In order to set the proper flags of those wrapper views, we want to set the flags after they are wrapped, e.g. after super.onActivityCreated()

Also watch this talk for info on fitsSystemWindows and window insets.

来源：https://stackoverflow.com/questions/34408424/immersive-mode-showing-blank-space

标签

android

android-immersive