The Joy of Custom Views: How to make a centered title Toolbar in Android

CenteredTitleToolbar.java

//
// CenteredTitleToolbar
//
// Created by Ben De La Haye on 25/05/2016.
//
public class CenteredTitleToolbar extends Toolbar {

    private TextView _titleTextView;
    private int _screenWidth;
    private boolean _centerTitle = true;

    public CenteredTitleToolbar(Context context) {
        super(context);
        init();
    }

    public CenteredTitleToolbar(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
        init();
    }

    public CenteredTitleToolbar(Context context, @Nullable AttributeSet attrs, int defStyleAttr) {
        super(context, attrs, defStyleAttr);
        init();
    }

    private void init() {
        _screenWidth = DeviceUtils.getInstance().getScreenSize().x;

        _titleTextView = new TextView(getContext());
        _titleTextView.setTextAppearance(getContext(), R.style.ToolbarTitleText);
        _titleTextView.setText("Title");
        addView(_titleTextView);
    }

    @Override
    protected void onLayout(boolean changed, int left, int top, int right, int bottom) {
        super.onLayout(changed, left, top, right, bottom);

        if (_centerTitle) {
            int[] location = new int[2];
            _titleTextView.getLocationOnScreen(location);
            _titleTextView.setTranslationX(_titleTextView.getTranslationX() + (-location[0] + _screenWidth / 2 - _titleTextView.getWidth() / 2));
        }
    }

    @Override
    public void setTitle(CharSequence title) {
        _titleTextView.setText(title);
        requestLayout();
    }

    @Override
    public void setTitle(int titleRes) {
        _titleTextView.setText(titleRes);
        requestLayout();
    }

    public void setTitleCentered(boolean centered) {
        _centerTitle = centered;
        requestLayout();
    }

    private Point getScreenSize() {
        WindowManager wm = (WindowManager) getContext().getSystemService(Context.WINDOW_SERVICE);
        Display display = wm.getDefaultDisplay();
        Point screenSize = new Point();
        display.getSize(screenSize);

        return screenSize;
    }
}

styles.xml

<?xml version="1.0" encoding="utf-8"?>
<resources>

    <style name="ToolbarTitleText" parent="Base.TextAppearance.Widget.AppCompat.Toolbar.Title">
        <item name="android:textColor">#FFFFFF</item>
    </style>
    
</resources>

Delete

What is DeviceUtils ??

Delete this line:
_screenWidth = DeviceUtils.getInstance().getScreenSize().x;

Replace with this:
_screenWidth = getScreenSize().x;