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    copied!<p>You can use this code:</p> <pre><code>&lt;Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:layout_marginRight="98dp" android:text="Button" /&gt; &lt;Button android:id="@+id/button2" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_toLeftOf="@+id/button1" android:text="Button" /&gt; </code></pre> <p><code>android:layout_alignParentBottom="true"</code> means that the bottom must be on the bottom. <code>android:layout_centerHorizontal="true"</code> means it should be in the center (so even space on left and right)</p> <p>for your code:</p> <pre><code>&lt;?xml version="1.0" encoding="utf-8"?&gt; &lt;RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_height="fill_parent" android:layout_width="fill_parent" android:orientation="vertical"&gt; &lt;RadioGroup android:id="@+id/tabs" android:layout_height="wrap_content" android:layout_width="fill_parent" android:orientation="horizontal"&gt; &lt;RadioButton android:id="@+id/radio_btn_0" android:layout_height="wrap_content" android:layout_width="0px" android:layout_weight="1" android:text="Absences" android:checked="true" android:textSize="@dimen/padding_small"/&gt; &lt;RadioButton android:id="@+id/radio_btn_1" android:layout_height="wrap_content" android:layout_width="0px" android:layout_weight="1" android:text="Students" android:textSize="@dimen/padding_small" /&gt; &lt;RadioButton android:id="@+id/radio_btn_2" android:layout_height="wrap_content" android:layout_width="0px" android:layout_weight="1" android:text="Grades" android:textSize="@dimen/padding_small"/&gt; &lt;RadioButton android:id="@+id/radio_btn_3" android:layout_height="wrap_content" android:layout_width="0px" android:layout_weight="1" android:text="Tests" android:textSize="@dimen/padding_small"/&gt; &lt;/RadioGroup&gt; &lt;com.github.ysamlan.horizontalpager.HorizontalPager android:id="@+id/horizontal_pager" android:layout_width="fill_parent" android:layout_height="0px" android:layout_weight="1"&gt; &lt;DragNDrop.DragNDropListView android:id="@+id/android:list" android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;/DragNDrop.DragNDropListView&gt; &lt;ScrollView android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:textSize="24sp" android:text="Students menu" android:textColor="#000" android:textStyle="bold" android:background="#0f0" /&gt; &lt;/ScrollView&gt; &lt;ScrollView android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:textSize="24sp" android:text="Grades menu" android:textColor="#000" android:textStyle="bold" android:background="#00f" /&gt; &lt;/ScrollView&gt; &lt;ScrollView android:layout_width="fill_parent" android:layout_height="fill_parent"&gt; &lt;TextView android:layout_width="fill_parent" android:layout_height="fill_parent" android:textSize="24sp" android:text="Tests" android:textColor="#000" android:textStyle="bold" android:background="#0f0" /&gt; &lt;/ScrollView&gt; &lt;/com.github.ysamlan.horizontalpager.HorizontalPager&gt; &lt;Button android:id="@+id/button1" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentLeft="true" android:drawableLeft="@drawable/r" android:drawablePadding="@dimen/padding_small" android:text="Refresh" android:textSize="@dimen/a12" /&gt; &lt;Button android:id="@+id/btn" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignParentBottom="true" android:layout_alignParentRight="true" android:drawableLeft="@drawable/back" android:drawablePadding="@dimen/padding_small" android:text="Return" android:textSize="@dimen/a12" /&gt; &lt;/RelativeLayout&gt; </code></pre> <p>I changed <code>android:layout_centerHorizontal="true"</code> instead of that 19dp thing. And made it a relativelayout</p>
 

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