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    <blockquote> <p>Each element of the Gallery consists on a <code>LinearLayout</code></p> </blockquote> <p>Just wrap it using another <code>LinearLayout</code> and set the margin in the <code>LinerLayout.LayoutParams</code> for the inner <code>LinearLayout</code>. I have checked it, and it seems to do what you want.</p> <p>So the layout you inflate for Gallery item should look like this:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/layOuter" android:layout_width="wrap_content" android:layout_height="wrap_content"&gt; &lt;LinearLayout android:id="@+id/layInner" android:layout_width="wrap_content" android:layout_height="wrap_content" android:orientation="vertical"&gt; &lt;ImageView android:id="@+id/imageView1" android:src="@drawable/icon" android:layout_height="wrap_content" android:layout_width="wrap_content" android:scaleType="fitXY" /&gt; &lt;TextView android:text="TextView" android:id="@+id/textView" android:layout_width="wrap_content" android:layout_height="wrap_content" android:visibility="visible" /&gt; &lt;/LinearLayout&gt; &lt;/LinearLayout&gt; </code></pre> <p>Then you can access inner LinearLayout in adapter <code>getView</code> method and set margin there depending on your conditions (sample code without convertView reuse optimization):</p> <pre><code>public View getView(int position, View convertView, ViewGroup parent) { Context context = getContext(); final float density = context.getResources().getDisplayMetrics().density; LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE); View layOuter = inflater.inflate(R.layout.row_layout, null); View layInner = layOuter.findViewById(R.id.layInner); if (...) { // your condition LinearLayout.LayoutParams innerLP = new LinearLayout.LayoutParams(LinearLayout.LayoutParams.WRAP_CONTENT, LinearLayout.LayoutParams.WRAP_CONTENT); innerLP.leftMargin = (int) (50 * density); layInner.setLayoutParams(innerLP); } return layOuter; } </code></pre> <p>Please note that you must use <code>LinearLayout.LayoutParams</code> (it extends <code>MarginLayoutParams</code>) for the inner layout, otherwise it will not work. </p>
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    1. COWhat I need is a mix of the two options. I have to reference the LinearLayout in the XML file and set the margin programatically, because different elements will have different margins. That's when you get the exception.
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    2. COPlease check the updated answer. As a general rule: you can set margin for elements which are places inside a layout that support margins (e.g.: RelativeLayout, LinearLayout, FrameLayout). So in your case you can set margins for elements placed in the `LinearLayout` (but not for the LinearLayout itself when its parent is Gallery which doesn't support setting margins for its child - that's why we should add inner LinearLayout) . If you need additional help please post the layout you use for Gallery row and `getView` code as well.
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    3. COAdding one more level of child elements worked. It seems that you cannot alter the layout params of the direct child of a Gallery. Thanks!
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