CoordinatorLayout children are not fullscreen

Question

I have an Activity which is displayed fullscreen. This works perfectly with many layouts I have tried, except for when the CoordinatorLayout is the roo

Answer 1

I had a similar issue and had to hack a bit of a solution. Instead of an ImageView, my CoordinatorLayout child view is for streaming a video. Since I am streaming a video during rotation, I need to to watch for configChanges and override onConfigurationChanged. This may not work for you if you do not want to override onConfigurationChanged, but it may work out. Like I said, it's a bit of a hack, but works for me.

I end up fully expanding the Toolbar, storing the offset, then hiding it (treating it as a standard view). Then when I rotate back, I am resizing it to whatever the offset was when the user rotated the device.

@Override
public void onConfigurationChanged(Configuration newConfig) {
    super.onConfigurationChanged(newConfig);
    if (newConfig.orientation == Configuration.ORIENTATION_PORTRAIT) {
        showToolbar();
        mViewPager.setVisibility(View.VISIBLE);

    } else if (newConfig.orientation == Configuration.ORIENTATION_LANDSCAPE) {
        hideToolbar();
        getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
                WindowManager.LayoutParams.FLAG_FULLSCREEN);
        mViewPager.setVisibility(View.GONE);
    }
}

public void hideToolbar()
{
    setCurrentOffset();
    expandToolbarToHeight(0);
    findViewById(R.id.toolbar).setVisibility(View.GONE);
}

public void showToolbar()
{
    expandToolbarToHeight(oldOffset);
    findViewById(R.id.toolbar).setVisibility(View.VISIBLE);
}

public void setCurrentOffset() {
    CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) mAppBarLayout.getLayoutParams();
    AppBarLayout.Behavior behavior = (AppBarLayout.Behavior) params.getBehavior();
    if (behavior != null) {
        oldOffset = behavior.getTopAndBottomOffset();
    }
}

public void expandToolbarToHeight(int height) {
    CoordinatorLayout.LayoutParams params = (CoordinatorLayout.LayoutParams) mAppBarLayout.getLayoutParams();
    AppBarLayout.Behavior behavior = (AppBarLayout.Behavior) params.getBehavior();
    if (behavior != null) {
        behavior.setTopAndBottomOffset(height);
        behavior.onNestedPreScroll(mCoordinatorLayout, mAppBarLayout, null, 0, 1, new int[2]);
    }
}