CODEWITHSUNDEEP
android-linearlayout
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0x29a

Reputation: 773

layout_weight ignored, if view is added programmatically

I have a View, in which I have two items aligned horizontally next to teach other, taking up the whole width of the parent (50:50):

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:id="@+id/selection_container">

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="#0c2003">
    </LinearLayout>

    <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:background="#Ac2003">
    </LinearLayout>

</LinearLayout>

It works as expected:

enter image description here

The problem is when I try to add these items (item.xml) to the parent (container.xml) programmatically, the layout_weight property seems to be ignored for some reason. Instead of items filling/expanding to full width, each item takes up few pixels of space:

enter image description here

I'm adding the views programmatically the following way:

LinearLayout container = mainView.findViewById( R.id.container );
View item1 = LayoutInflater.from( mainView.getContext() ).inflate( R.layout.item, null, false );
View item2 = LayoutInflater.from( mainView.getContext() ).inflate( R.layout.item, null, false );
container.addView( item1 );
container.addView( item2 );

I tried to call afterwards:

container.invalidate();
container.requestLayout();

but that didn't make any difference.

container.xml:

<LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:orientation="horizontal"
    android:id="@+id/selection_container"/>

item.xml: 

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:background="#0c2003">
</LinearLayout>

Why are the layout_weight properties are ignored, when adding the view programmatically? Thanks!

Upvotes: 1

Views: 155

Answers (1)

0x29a
0x29a

Reputation: 773

The problem was that I did not provide the 'parent' argument for the inflate function. If the argument is not provided some attributes like the width/height/weight are ignored as the inflator needs to know who its parent is in order to lay out the inflated view properly.

View item1 = LayoutInflater.from( mainView.getContext() ).inflate( R.layout.item, (ViewGroup)itemView, false );

Upvotes: 2

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