Question

I have a Layout containing a fragment. I set width of Layout to let’s say 300dip.

I want to calculate the width of the children programmatically in relation to the 300dip of the parent.

I can’t do it in XML since it has some “tricks” and using weigths or RelativeLayout will not work and I have to use maths.

Here is the fragment with the containing layout…

<LinearLayout 
    android:layout_width="300dip"
    android:layout_height="wrap_content"
    android:orientation="vertical"
    >

    <fragment
        android:id="@+id/tabbar"
        android:name="com.test.MyFragment"
        android:layout_width="fill_parent"
        android:layout_height="wrap_content" />
</LinearLayout>

In MyFragment there’s the method:

public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
    Log.d("test", "container: "  + container);
    View view = inflater.inflate(R.layout.mylayout, container, false);
    Log.d("test", "view width: "  + view.getWidth());

    //do things with view

    return view;
}

I get the outputs container: null and view width: 0 and I can’t find any onMeasure method in the fragment or similar.

Answer 1

onCreateView is called before your layouts have been inflated, so they have no height or width. If you want to fiddle with how layouts and views are drawn, you can create your own view, extending View, and implement onLayout(); If you Google, there’s plenty of examples of that.