session-android/res/layout/prompt_passphrase_activity.xml

<?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"
            android:fillViewport="true"
            android:background="@drawable/background_pattern_repeat">

    <LinearLayout android:id="@+id/prompt_layout"
                  android:padding="16dp"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:gravity="center_horizontal|center_vertical"
                  android:orientation="vertical">

        <ImageView android:layout_width="wrap_content"
                   android:layout_height="wrap_content"
                   android:layout_gravity="center"
                   android:layout_marginBottom="24dp"
                   android:src="@drawable/padlock_prompt"/>

        <TextView style="@style/Registration.Label"
                  android:layout_width="match_parent"
                  android:textAllCaps="true"
                  android:text="@string/prompt_passphrase_activity__textsecure_passphrase" />

        <EditText android:id="@+id/passphrase_edit"
                  android:layout_width="match_parent"
                  android:layout_height="wrap_content"
                  android:inputType="textPassword"
                  android:layout_marginBottom="8dp"
                  android:singleLine="true"/>

        <Button android:id="@+id/ok_button"
                android:text="@string/prompt_passphrase_activity__unlock"
                android:layout_width="wrap_content"
                android:layout_height="wrap_content"
                android:layout_gravity="right"
                android:textAppearance="?android:attr/textAppearanceMedium"/>

    </LinearLayout>

</ScrollView>