How to create a transparent activity WITHOUT windowIsFloating

Question

windowIsFloating while a great one stop shop for creating Dialog styled UI\'s has many ---bugs--- quirks.

The one which I\'m battling right no

Answer 1

The accepted answer works fine, until I need to have an EditText inside the dialog-style window, as the soft IME keyboard would not push the "dialog" up without windowIsFloating. So I have to tackle the 'bug' head-on.

As with the case in the question, I need to have the width set to "match_parent" while the height can remain "wrap_content". Using windowIsFloating, I end up setting up a ViewTreeObserver, traverse up the view tree during layout, and force the floating window to the desired width. The approach is as follows (under onCreate() of the Activity) -

setContentView(contentView);

// set up the ViewTreeObserver
ViewTreeObserver vto = contentView.getViewTreeObserver();
vto.addOnGlobalLayoutListener(new ViewTreeObserver.OnGlobalLayoutListener() {
    int displayWidth = -1;
    DisplayMetrics metrics = null;
    View containerView = null;

    @Override
    public void onGlobalLayout() {            
        if (containerView == null) {
            // traverse up the view tree
            ViewParent v = contentView.getParent();
            containerView = contentView;
            while ((v != null) && (v instanceof View)) {
                containerView = (View) v;
                v = v.getParent();
            }
        }
        if (metrics == null) {
            metrics = new DisplayMetrics();
        }
        Display display = getWindowManager().getDefaultDisplay();
        display.getMetrics(metrics);
        if (displayWidth != metrics.widthPixels) {
            displayWidth = metrics.widthPixels;
            WindowManager.LayoutParams params = 
                    (WindowManager.LayoutParams) containerView.getLayoutParams();
            // set the width to the available width to emulate match_parent
            params.width = displayWidth;
            // windowIsFloating may also dim the background
            // do this if dimming is not desired
            params.dimAmount = 0f;
            containerView.setLayoutParams(params);
            getWindowManager().updateViewLayout(containerView, params);
        }
    }
});

This works up to Android 7 so far (even in split screen mode), but one may catch the possible cast exception for casting to WindowManager.LayoutParams in case future implementation changes, and add removeOnGlobalLayoutListener(); in an appropriate place.