Gap between left drawable and text in a EditText

You should add android:drawablePadding attribute to your EditText. Example layout with 10dp drawable padding:

<EditText
    android:id="@+id/emailEditText"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_marginTop="@dimen/sign_up_edittext_vertical_top_margin"
    android:drawableLeft="@drawable/email_drawable"
    android:imeOptions="actionNext"
    android:inputType="textEmailAddress"
    android:drawablePadding="10dp"
    android:singleLine="true" />