How to Align 3 buttons in a line, android?

Question

I have linear vertical layout in parent. Then a horizontal linear layout in the bottom including 3 buttons

I want 1st button at the leftmost side of the activity in bottom 2nd button in the center and 3rd button in the rightmost side

Here is the xml

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

   <ImageView
    android:id="@+id/viewImageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:contentDescription="@null"
    android:src="@drawable/ic_launcher" />

<LinearLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Button" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:gravity="right"
        android:layout_gravity="fill_vertical"
        android:text="Button" />
</LinearLayout>

Answer 1

For those type of alignment(one button in extreme left of parent, another in center and one more in extreme right of parent layout) RelativeLayout will be more handy than the LinearLayout.Because, if you use RelativeLayout as your parent layout for your buttons you can make use of android:layout_alignParentLeft="true" for one button you want to align in extreme left,android:layout_centerInParent="true" to align in center and android:layout_alignParentRight="true" to align a button in right side corner.

Try this..

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

   <ImageView
    android:id="@+id/viewImageView"
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_weight="1"
    android:contentDescription="@null"
    android:src="@drawable/ic_launcher" />

<RelativeLayout
    android:layout_width="wrap_content"
    android:layout_height="wrap_content"
    android:layout_gravity="bottom" >

    <Button
        android:id="@+id/button1"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:text="Button" />

    <Button
        android:id="@+id/button2"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="Button" />

    <Button
        android:id="@+id/button3"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true"
        android:text="Button" />
</RelativeLayout>

</LinearLayout>