How to show PopupWindow at special location?

Question

I need to show PopupWindow under one Views shown on the screen.

How can I calculate coordinates of needed View and place

Answer 1

To get size of the main application screen without stuff like title and notification bars, override the following method in the class generating the screen in question (sizes are measured in pixels):

@Override
protected void onMeasure (int widthMeasureSpec, int heightMeasureSpec) {
    super.onMeasure(widthMeasureSpec, heightMeasureSpec);
    int height = MeasureSpec.getSize(heightMeasureSpec);
}

To get the bottom coordinate of the view under which you want to show the popup:

View upperView = ...
int coordinate = upperView.getBottom();

Now as long as height - coordinate is large enough for your popup view, you can simply place the popup like this:

PopupWindow popup = new PopupWindow();

Button button = new Button(this);
button.setOnClickListener(new OnClickListener() {
    public void onClick(View v) {
        popup.showAtLocation(parent, Gravity.CENTER, 0, coordinate);
    }
});

Here, showAtLocation() takes the parent view as an argument together with gravity and location offsets.