onGlobalLayout()

BaseActivity.java

protected static final int IGNORE_BACKGROUND_WIDTH_CHANGES = 1 << 1;
protected static final int IGNORE_BACKGROUND_HEIGHT_CHANGES = 1 << 2;

private View globalLayoutView;
protected int globalLayoutWidth = -1, globalLayoutHeight = -1;
private int globalLayoutFlags = 0;

protected void addGlobalLayoutListener(View globalLayoutView) {
	addGlobalLayoutListener(globalLayoutView, 0);
}

protected void addGlobalLayoutListener(View globalLayoutView, int flags) {
	this.globalLayoutView = globalLayoutView;
	this.globalLayoutFlags = flags;
	globalLayoutView.getViewTreeObserver().addOnGlobalLayoutListener(this);
}

@Override
public void onGlobalLayout() {
	// logLifecycle("onGlobalLayout");
	final int w = globalLayoutView.getWidth();
	final int h = globalLayoutView.getHeight();

	if (((globalLayoutFlags & IGNORE_BACKGROUND_WIDTH_CHANGES) == 0 && w != globalLayoutWidth)
			|| ((globalLayoutFlags & IGNORE_BACKGROUND_HEIGHT_CHANGES) == 0 && h != globalLayoutHeight)) {
		globalLayoutWidth = w;
		globalLayoutHeight = h;
		// logLifecycle("onGlobalLayout2");
		onGlobalLayout2();
	}
}

protected void onGlobalLayout2() {
}

SubActivity.java

@Override
protected void onCreate(Bundle savedInstanceState) {
	super.onCreate(savedInstanceState);

	addGlobalLayoutListener(incdecContainer, IGNORE_BACKGROUND_HEIGHT_CHANGES);
}

@Override
protected void onGlobalLayout2() {

	// Distribute horizontal space evenly between incdec containers
	final int hspace = globalLayoutWidth - (incdecContL.getWidth() << 1);
	final int sideGaps = hspace / 3;
	final int midGap = hspace - (sideGaps << 1);
	((RelativeLayout.LayoutParams) incdecContL.getLayoutParams()).leftMargin = sideGaps;
	((RelativeLayout.LayoutParams) incdecContR.getLayoutParams()).leftMargin = midGap;

	// Sync h/v space between incdec views
	final int paddingV = Math.min(incdecMaxPaddingV, midGap);
	for (DurationIncDecView v : incDecViews) {
		((LinearLayout.LayoutParams) v.getLayoutParams()).bottomMargin = paddingV;
	}

	incdecContainer.requestLayout();
}