Place 3 buttons in a LinearLayout to occupy equal amount of space

Question

i would like to have three buttons taking equal amount of available space horizontally in a row. I used android:layout_gravity. What is the problem?

layout

Answer 1

Divide the weight sum to equal proportion in all buttons.

Remove layout_gravity property and add android:layout_weight=0.33.

It will work

Answer 2

Put the buttons in a relative layout. add properties to the buttons allignParentleft = true, another allignParentcenter= true and the allignParentRight = true to each button.

Answer 3

Check out this:

<RelativeLayout 
    android:id="@+id/layout"
    android:layout_width="fill_parent"
    android:layout_height="wrap_content">

    <Button 
        android:id="@+id/button1"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"/>
    <RelativeLayout 
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true">
        <Button 
            android:id="@+id/button2"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="wrap_content"
            android:layout_toRightOf="@+id/button1"/>
    </RelativeLayout>
    <Button 
        android:id="@+id/button3"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"/>
</RelativeLayout>

Answer 4

Give android:layout_weight="1" for each Button

Here Android Developer Guide:

Layout Weight

LinearLayout also supports assigning a weight to individual children with the android:layout_weight attribute. This attribute assigns an "importance" value to a view in terms of how much space it should occupy on the screen. A larger weight value allows it to expand to fill any remaining space in the parent view. Child views can specify a weight value, and then any remaining space in the view group is assigned to children in the proportion of their declared weight. Default weight is zero.

For example, if there are three text fields and two of them declare a weight of 1, while the other is given no weight, the third text field without weight will not grow and will only occupy the area required by its content. The other two will expand equally to fill the space remaining after all three fields are measured. If the third field is then given a weight of 2 (instead of 0), then it is now declared more important than both the others, so it gets half the total remaining space, while the first two share the rest equally.

Source

Answer 5

besides of setting a layout_weight you have to set layout_width or layout_height to 0dp. So if you want for example to distribute the buttons horizontally , layout_width should be 0dp and layout_weight .2 or any number as long as is equal through the buttons you have.

so your layout should be like this

<LinearLayout 
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
>

<Button android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/Bg"
        android:background="@drawable/button_red"
        android:layout_weight="1"
/>
<Button android:id="@+id/button"
        android:layout_width="0dp"
        android:layout_height="wrap_content"
        android:text="@string/Bm"
        android:background="@drawable/button_red"
        android:layout_weight="1"
        android:textColor="#ffffff"
/>

<Button
    android:id="@+id/button"
    android:layout_width="0dp"
    android:layout_height="wrap_content"
    android:background="@drawable/button_red"
    android:layout_weight="1"
    android:text="@string/Bf"
/>
</LinearLayout>

Answer 6

You can divide it like this: `

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentLeft="true"
                android:layout_alignParentStart="true"
                android:layout_centerVertical="true"
                android:layout_toLeftOf="@+id/imageButtonLikedPost">

                <ImageButton
                    android:id="@+id/imageButtonMyPost"
                    android:layout_width="wrap_content"
                    android:layout_height="wrap_content"
                    android:layout_centerHorizontal="true"
                    android:layout_centerVertical="true"
                    android:background="@drawable/mypost_tab_bg" />
            </RelativeLayout>

            <ImageButton
                android:id="@+id/imageButtonLikedPost"
                android:layout_width="40dp"
                android:layout_height="30dp"
                android:layout_centerHorizontal="true"
                android:layout_centerVertical="true"
                android:background="@drawable/mylike_tab_bg" />

            <RelativeLayout
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_alignParentEnd="true"
                android:layout_alignParentRight="true"
                android:layout_centerVertical="true"
                android:layout_toRightOf="@+id/imageButtonLikedPost">

                <ImageButton
                    android:id="@+id/imageButtonMyBlog"
                    android:layout_width="30dp"
                    android:layout_height="30dp"
                    android:layout_centerHorizontal="true"
                    android:layout_centerVertical="true"
                    android:background="@drawable/tab4_bg" />
            </RelativeLayout>
        </RelativeLayout>`