Evenly spaced menu items on Toolbar

Question

So I\'ve been trying to implement android.support.v7.widget.Toolbar in my Activity and to make it look similar to the previously supported split ActionBar.

Answer 1

UPDATE

Google now has very similar functionality inflated the normal ways menus inflate using a new Widget call BottomNavigationView

-- Original Answer --

Guys this took me some time to figure out and here you go its a little bit of a heavy operation but it works.

I use this on a Toolbar to display across the bottom of the screen like the old SplitActionBar...

BEHOLD the evenly distributed MenuItems across your Toolbar

I would not recommend using more than 5 or 6 items, it may get a little crowded...

/**
 * This method will take however many items you have in your  
 * menu/menu_main.xml and distribute them across your devices screen
 * evenly using a Toolbar. Enjoy!!
 */
public void setupEvenlyDistributedToolbar(){
    // Use Display metrics to get Screen Dimensions
    Display display = getWindowManager().getDefaultDisplay();
    DisplayMetrics metrics = new DisplayMetrics();
    display.getMetrics(metrics);

    // Toolbar
    mToolbar = (Toolbar) findViewById(R.id.navigationToolbar);
    // Inflate your menu
    mToolbar.inflateMenu(R.menu.menu_bottom);

    // Add 10 spacing on either side of the toolbar
    mToolbar.setContentInsetsAbsolute(10, 10);

    // Get the ChildCount of your Toolbar, this should only be 1
    int childCount = mToolbar.getChildCount();
    // Get the Screen Width in pixels
    int screenWidth = metrics.widthPixels;

    // Create the Toolbar Params based on the screenWidth
    Toolbar.LayoutParams toolbarParams = new Toolbar.LayoutParams(screenWidth, LayoutParams.WRAP_CONTENT);

    // Loop through the child Items
    for(int i = 0; i < childCount; i++){
        // Get the item at the current index
        View childView = mToolbar.getChildAt(i);
        // If its a ViewGroup
        if(childView instanceof ViewGroup){
            // Set its layout params
            childView.setLayoutParams(toolbarParams);
            // Get the child count of this view group, and compute the item widths based on this count & screen size
            int innerChildCount = ((ViewGroup) childView).getChildCount();
            int itemWidth  = (screenWidth / innerChildCount);               
            // Create layout params for the ActionMenuView
            ActionMenuView.LayoutParams params = new ActionMenuView.LayoutParams(itemWidth, LayoutParams.WRAP_CONTENT);
            // Loop through the children
            for(int j = 0; j < innerChildCount; j++){
                View grandChild = ((ViewGroup) childView).getChildAt(j);
                if(grandChild instanceof ActionMenuItemView){
                    // set the layout parameters on each View
                    grandChild.setLayoutParams(params);
                }
            }
        }
    }
}