Centralizar componente assim que selecionado

Gostaria de saber como eu faço pro edittext se ajustar automaticamente no centro da activity assim que selecionado.

OBS. Já estou usando android:windowSoftInputMode="stateVisible|adjustResize" (Manifest) ScrollView (na activity)

        <activity
            android:name=".ui.AdesaoSenhaEletronicaProvisoriaActivity_"
            android:screenOrientation="portrait"
            android:windowSoftInputMode="stateVisible|adjustResize"
            android:theme="@style/AppTheme.Full.Light">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:orientation="vertical">

        <PACOTE.ui.custom.HeaderAdesaoView_
            android:id="@+id/headerView"
            android:layout_width="match_parent"
            android:layout_height="wrap_content" />

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:orientation="vertical"
            android:padding="@dimen/activity_horizontal_margin">

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="center_horizontal"
                android:text="@string/otimo"
                android:textAppearance="@style/TextoTitulo" />

            <TextView
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_marginTop="16dp"
                android:gravity="center"
                android:textSize="17sp"
                android:text="@string/senha_provisoria_intro" />

            <br.gov.caixa.internetbankingmobile.ui.custom.EditTextValidation_
                android:id="@+id/et_senha_provisoria"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="28dp" />

            <PACOTE.ui.custom.EditTextValidation_
                android:id="@+id/et_nova_senha"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/margin_small" />

            <PACOTE.ui.custom.EditTextValidation_
                android:id="@+id/et_confirme_nova_senha"
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginTop="@dimen/margin_small"/>