Unable to align one Image button right while the other one the left

This the xml in which I am trying to keep one image button on the right and while the left ? I dont why it is not happening though i have set the grvaity too ?

<LinearLayout android:id="@+id/linearLayout1"
      android:layout_height="wrap_content" android:gravity="center_horizontal"
       android:layout_width="wrap_content" android:layout_gravity="fill">
           <ImageButton android:layout_width="wrap_content"
        android:layout_gravity="left" android:id="@+id/imageButton1"
        android:src="@drawable/arrow_button_left"    android:layout_height="wrap_content"></ImageButton>
            <ImageButton android:layout_width="wrap_content"
            android:layout_gravity="right" android:id="@+id/imageButton2"
            android:src="@drawable/arro开发者_C百科w_button_right"      android:layout_height="wrap_content"></ImageButton>
    </LinearLayout>

You should use RelativeLayout instead of LinearLayout, and set the layout_alignParentRight attribute for the second ImageButton to true:

android:layout_alignParentRight="true"

so your layout would look like:

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout android:id="@+id/relativeLayout1" 
    android:layout_height="wrap_content" android:gravity="center_horizontal" 
    android:layout_width="fill_parent" android:layout_gravity="fill">
    <ImageButton android:layout_width="wrap_content" 
        android:id="@+id/imageButton1" 
        android:src="@drawable/arrow_button_left" 
        android:layout_height="wrap_content" />
    <ImageButton android:layout_width="wrap_content" 
        android:id="@+id/imageButton2" 
        android:src="@drawable/arrow_button_right" 
        android:layout_height="wrap_content"
        android:layout_alignParentRight="true" />
</RelativeLayout>

You set LinearLayout's width to wrap_content so it has a minimal width to place buttons inside itself. There's no way these button can be aligned just because they have no space for alignment. Try setting fill_parent.

may be you forget android:orientation="horizontal" in LinearLayout if you have used width to wrap_content.

Else Relativle layout as stated above is perfect for you.