Question

I have a LinearLayout set height as match_parent as below:

<LinearLayout
    android:id="@+id/list_layout"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >

I want to get the height of this LinearLayout.
I used the code below:

LinearLayout ll_list = (LinearLayout)findViewById(R.id.list_layout);
int h = ll_list.getHeight();

But it return null.
How can I do?

Answer 1

First of all: your LinearLayout id is left_layout, not list_layout.

Also, ll_list.getHeight() will return 0 (as well as ll_list.getWidth()) if it’s not drawed yet.

Solution would be to get the height after your view is layouted:

ll_list.post(new Runnable(){
    public void run(){
         int height = ll_list.getHeight();
    }
});

And make sure that your ll_list is final.