A fragment container enabling the use of android:fitsSystemWindows in fragment layouts.

WindowInsetsFrameLayout.java

package be.digitalia.common.widgets;

import android.annotation.SuppressLint;
import android.annotation.TargetApi;
import android.content.Context;
import android.graphics.Rect;
import android.os.Build;
import android.support.v4.util.ObjectsCompat;
import android.util.AttributeSet;
import android.view.View;
import android.view.WindowInsets;
import android.widget.FrameLayout;

/**
 * A FrameLayout which memorizes the window insets and propagates them to child views before they are measured.
 * You can use this layout as a fragment container in place of a standard FrameLayout to
 * propagate window insets to attached fragments.
 *
 * @author Christophe Beyls
 */
public class WindowInsetsFrameLayout extends FrameLayout {

	private Object mLastInsets;

	public WindowInsetsFrameLayout(Context context) {
		super(context);
	}

	public WindowInsetsFrameLayout(Context context, AttributeSet attrs) {
		super(context, attrs);
	}

	public WindowInsetsFrameLayout(Context context, AttributeSet attrs, int defStyle) {
		super(context, attrs, defStyle);
	}

	@TargetApi(Build.VERSION_CODES.KITKAT_WATCH)
	@Override
	public WindowInsets onApplyWindowInsets(WindowInsets insets) {
		if (!ObjectsCompat.equals(mLastInsets, insets)) {
			mLastInsets = insets;
			requestLayout();
		}
		return insets.consumeSystemWindowInsets();
	}

	@SuppressWarnings("deprecation")
	@Override
	protected boolean fitSystemWindows(Rect insets) {
		if (!ObjectsCompat.equals(mLastInsets, insets)) {
			if (mLastInsets == null) {
				mLastInsets = new Rect(insets);
			} else {
				((Rect) mLastInsets).set(insets);
			}
			requestLayout();
		}
		return true;
	}

	@SuppressLint("DrawAllocation")
	@SuppressWarnings("deprecation")
	@Override
	protected void onMeasure(int widthMeasureSpec, int heightMeasureSpec) {
		if (mLastInsets != null) {
			if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.KITKAT_WATCH) {
				final WindowInsets wi = (WindowInsets) mLastInsets;
				final int childCount = getChildCount();
				for (int i = 0; i < childCount; i++) {
					final View child = getChildAt(i);
					if (child.getVisibility() != GONE) {
						child.dispatchApplyWindowInsets(wi);
					}
				}
			} else {
				super.fitSystemWindows(new Rect((Rect) mLastInsets));
			}
		}
		super.onMeasure(widthMeasureSpec, heightMeasureSpec);
	}
}

Awesome work Bruh ...

Just amazing
one problem - onMeasure is triggered 100 times

This class should not be used anymore: use FragmentContainerView instead.