android:textColorHighlight Color of the text selection highlight.

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical" >
    <EditText
      android:id="@+id/et_inputBox"
      android:layout_height="wrap_content"
      android:layout_width="match_parent"
      android:textColorHighlight="#B4DF87"
        />

    <AutoCompleteTextView
        android:id="@+id/act_input"
        android:layout_below="@id/et_inputBox"
        android:layout_width="fill_parent"
      android:layout_height="wrap_content"
      android:textColorHighlight="#B4DF87"
        />
</LinearLayout>