以编程方式设置视图Y位置

Question

I got a layout in which there's a RelativeLayout with a visibility of GONE . This rl is a layout for a bar with buttons which appears at the bottom of the fragment when setting the visibility to visible . While the RL is still not visible, there are 2 buttons and when I set it to visible, the RL is covering the buttons.

What I want to do is simply move the buttons up above that bar which becomes visible. What I tried to do it:

rl.setVisibility(View.VISIBLE);
rl.post(new Runnable() 
{   
                int dpToPx(final int dp)
                {
                    return (int) (dp * getResources().getSystem().getDisplayMetrics().density + 0.5f);
                }

                @Override
                public void run() {
                    int h = rl.getHeight(); //height is ready
                    h = dpToPx(h);
                    ImageButton button = (ImageButton)inflate.findViewById(R.id.button1);
                    float y = button.getY();
                    button.setY((float)h+y - 1100);
                    ImageButton button2 = (ImageButton)inflate.findViewById(R.id.button2);
                    y = button2.getY();
                    button2.setY((float)h+y);
                }
            });

The button with the -1100 (That number was just something I checked to see how it affects the position of the button and will not stay there obviously) is showing where I want it to be. The other button is so high or low which is no longer visible.

How do I set the position such that the button's Y position will be the old position + the height of the newly shown relative layout so the buttons will show just above it?

Answer 1

This is straightforward, all we need to do is to position the buttons at the y coordinate of our RelativeLayout.

We can get the y coordinate by calling:

rl.getY();

And since we want the button to be above the rl, we will subtract its height from the y coordinate of rl, something like this:

button.setY(rl.getY() - button.getHeight());