how to get the bottom of a layout in android? - android-layout

Question

I'm using a relative layout in Android, and when adding a view to the bottom of the screen the view is placed lower than the actual bottom of the screen, where the user cant actualy see it.
view.setY(container.getBottom()-view.getHeight());
container.addView(view);
container is a RelativeLayout. i have also tried to use container.getHeight() which gave me the same result, and all the other solutions i found where using the xml file, which doesnt work for me since i need to add the view dynamically in a random position above the bottom of the screen, meaning
view.setY(container.getHeight()-Common.random.nextFloat()*100-view.getHieght());
this is the XML
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="#+id/layout"
tools:context="il.co.ovalley.dashvsponypolice.app.MainActivity">
</RelativeLayout>
and the View im trying to add:
public class GameView extends ImageView{
public GameView(RelativeLayout container) {
super(container.getContext());
m_container=container;
container.addView(this);
}
}
public class Cop extends GameView {
public Cop(RelativeLayout container) {
super(container);
m_isShooting=false;
m_LoadingTime=10;
m_isLoading=false;
m_xSpeed=1.5f;
setY(container.getHeight()-Common.random.nextFloat()*100-getHeight()/*-getPaddingBottom()*/);
float x=(Common.random.nextFloat()*m_container.getWidth());
setX(x);
drwableState=0;
changeDirection();
}
I have tested that on different versions of android and screen sizes and got the same result. so far, the only solution I found was subtracting an arbitrary int from the container's height which seems ok on one device and hope for the best for the others, I'm sure there is a better solution.
thnx

Answer 1

Why don't you just place the view at the bottom of the screen with ALIGN_PARENT_BOTTOM and then apply a random padding?
RelativeLayout.LayoutParams params = new RelativeLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT);
params.addRule(RelativeLayout.ALIGN_PARENT_BOTTOM);
view.setPadding(0, 0, 0, randomValue); // left, top, right, bottom
container.addView(view, params);
All this calculating with the view.getHeight() is not good. Doing it like this works without you having to manage any of that yourself.