android：如何在全屏对话框中隐藏底部按钮

Question

I'm trying to hide navigation buttons when a dialog is shown fullscreen. I've manage to do it following this example: Android fullscreen dialog

however, whenever i touch a button they appear again.

is there any way to hide them properly?

thanks

Answer 1

The following snippet hides the navigation bar and status bar:

window.decorView.apply {
    // Hide both the navigation bar and the status bar.
    // SYSTEM_UI_FLAG_FULLSCREEN is only available on Android 4.1 and higher, but as
    // a general rule, you should design your app to hide the status bar whenever you
    // hide the navigation bar.
    systemUiVisibility = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_FULLSCREEN
}

From https://developer.android.com/training/system-ui/navigation

Nonetheless for your case you need two things to happen.

• First, set windowFullScreen to true to allow the dialog to paint every pixel in the screen. (ie Use any FullScreen theme).

• Then, on you dialog, set the systemUiVisibility to View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION .

This will stop the navigationBar from ever showing until you reset the flags or dismiss the dialog.

The complete snippet:

class SomeActivity {

    fun showDialog() {
        FullScrenDialog()
            .apply {
                setStyle(DialogFragment.STYLE_NO_TITLE, android.R.style.Theme_NoTitleBar_Fullscreen)
            }
            .show(supportFragmentManager, "TAG")
    }

}


class FullScrenDialog : DialogFragment() {

    override fun onCreateView(inflater: LayoutInflater, container: ViewGroup?, savedInstanceState: Bundle?): View? {
        dialog.window?.decorView?.systemUiVisibility = View.SYSTEM_UI_FLAG_IMMERSIVE_STICKY or View.SYSTEM_UI_FLAG_HIDE_NAVIGATION
        return inflater.inflate(R.layout.dialog, container)
    }

}

Answer 2

Please try below code for dialog:

final Dialog dialog = new Dialog(this);
        dialog.setCancelable(false);
        dialog.requestWindowFeature(Window.FEATURE_NO_TITLE);
        dialog.getWindow().setBackgroundDrawable(new ColorDrawable(Color.TRANSPARENT));
        dialog.getWindow().setGravity(Gravity.CENTER);
        dialog.setContentView(R.layout.dialog_logout);
        Window window = dialog.getWindow();
        window.setLayout(LinearLayout.LayoutParams.MATCH_PARENT, LinearLayout.LayoutParams.WRAP_CONTENT);
        window.setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,WindowManager.LayoutParams.FLAG_FULLSCREEN);
        int uiOptions = View.SYSTEM_UI_FLAG_HIDE_NAVIGATION | View.SYSTEM_UI_FLAG_FULLSCREEN;
        window.getDecorView().setSystemUiVisibility(uiOptions);
        dialog.show();

Output is:

I hope it works for you.