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    copied!<p><code>android:gravity</code> handles the alignment of its children,</p> <p><code>android:layout_gravity</code> handles the alignment of itself.</p> <p>So use one of these.</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#000" android:baselineAligned="false" android:gravity="center" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".Main" &gt; &lt;LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" &gt; &lt;ImageView android:id="@+id/imageButton_speak" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/image_bg" android:src="@drawable/ic_speak" /&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_weight="1" android:gravity="center" &gt; &lt;ImageView android:id="@+id/imageButton_readtext" android:layout_width="wrap_content" android:layout_height="wrap_content" android:background="@drawable/image_bg" android:src="@drawable/ic_readtext" /&gt; &lt;/LinearLayout&gt; ... &lt;/LinearLayout&gt; </code></pre> <p>or</p> <pre><code>&lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" android:background="#000" android:baselineAligned="false" android:paddingBottom="@dimen/activity_vertical_margin" android:paddingLeft="@dimen/activity_horizontal_margin" android:paddingRight="@dimen/activity_horizontal_margin" android:paddingTop="@dimen/activity_vertical_margin" tools:context=".Main" &gt; &lt;LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" &gt; &lt;ImageView android:id="@+id/imageButton_speak" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/image_bg" android:src="@drawable/ic_speak" /&gt; &lt;/LinearLayout&gt; &lt;LinearLayout android:layout_width="0dp" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_weight="1" &gt; &lt;ImageView android:id="@+id/imageButton_readtext" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center" android:background="@drawable/image_bg" android:src="@drawable/ic_readtext" /&gt; &lt;/LinearLayout&gt; ... &lt;/LinearLayout&gt; </code></pre>
 

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