Linear Layout and weight in Android

I always read about this funny weight value in the Android documentations. Now I want to try it for the first time but it isn't working at all.

As I understand it from the documentations this layout:

  <LinearLayout
     android:layout_width="fill_parent"
     android:layout_height="wrap_content"
     android:orientation="horizontal">

     <Button
        android:text="Register"
        android:id="@+id/register"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dip"
        weight="1" />

     <Button
        android:text="Not this time"
        android:id="@+id/cancel"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:padding="10dip"
        weight="1" />

  </LinearLayout>

should create two buttons that are horizontally aligned and share the space equally. The problem is the two buttons don't grow to fill the space.

I would like the buttons to grow and fill the whole line. If both buttons are set to match parent only the first button is shown and fills the whole line.

---

You are not setting the layout_weight property. Your code reads weight="1" and it should read android:layout_weight="1" .

---

3 things to remember:

set the android:layout_width of the children to "0dp"

set the android:weightSum of the parent (edit: as Jason Moore noticed, this attribute is optional, because by default it is set to the children's layout_weight sum)

set the android:layout_weight of each child proportionally (eg weightSum="5", three children: layout_weight="1", layout_weight="3", layout_weight="1")

Example:

    <LinearLayout
    android:layout_width="fill_parent"
    android:layout_height="wrap_content"
    android:weightSum="5">

    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="1" />

    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="3"
        android:text="2" />

    <Button
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:layout_weight="1"
        android:text="3" />

    </LinearLayout>

And the result:

---

It's android:layout_weight . Weight can only be used in LinearLayout . If the orientation of linearlayout is Vertical, then use android:layout_height="0dp" and if the orientation is horizontal, then use android:layout_width = "0dp" . It'll work perfectly.

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