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copied!<p>Short Answer: use <code>android:gravity</code> or <code>setGravity()</code> to control gravity of all child views of a container; use <code>android:layout_gravity</code> or <code>setLayoutParams()</code> to control gravity of an individual view in a container.</p> <p>Long story: to control gravity in a linear layout container such as <code>LinearLayout</code> or <code>RadioGroup</code>, there are two approaches:</p> <p>1) To control the gravity of ALL child views of a <code>LinearLayout</code> container (as you did in your book), use <code>android:gravity</code> (not <code>android:layout_gravity</code>) in layout XML file or <code>setGravity()</code> method in code.</p> <p>2) To control the gravity of a child view in its container, use <code>android:layout_gravity</code> XML attribute. In code, one needs to get the <code>LinearLayout.LayoutParams</code> of the view and set its gravity. Here is a code example that set a button to bottom in a horizontally oriented container:</p> <pre><code>import android.widget.LinearLayout.LayoutParams; import android.view.Gravity; ... Button button = (Button) findViewById(R.id.MyButtonId); // need to cast to LinearLayout.LayoutParams to access the gravity field LayoutParams params = (LayoutParams)button.getLayoutParams(); params.gravity = Gravity.BOTTOM; button.setLayoutParams(params); </code></pre> <p>For horizontal <code>LinearLayout</code> container, the horizontal gravity of its child view is left-aligned one after another and cannot be changed. Setting <code>android:layout_gravity</code> to <code>center_horizontal</code> has no effect. The default vertical gravity is center (or center_vertical) and can be changed to top or bottom. Actually the default <code>layout_gravity</code> value is <code>-1</code> but Android put it center vertically. </p> <p>To change the horizontal positions of child views in a horizontal linear container, one can use <code>layout_weight</code>, margin and padding of the child view. </p> <p>Similarly, for vertical View Group container, the vertical gravity of its child view is top-aligned one below another and cannot be changed. The default horizontal gravity is center (or <code>center_horizontal</code>) and can be changed to left or right.</p> <p>Actually, a child view such as a button also has <code>android:gravity</code> XML attribute and the <code>setGravity()</code> method to control its child views -- the text in it. The <code>Button.setGravity(int)</code> is linked to this <a href="http://developer.android.com/reference/android/widget/TextView.html#setGravity%28int%29">developer.android.com entry</a>.</p>

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