Set drawable position inside button

try this

 <Button
    android:id="@+id/addsubject"
    android:layout_width="160dip"
    android:layout_height="60dip"
    android:layout_gravity="center"
    android:drawableLeft="@drawable/ic_action_add"
    android:drawablePadding="2dip"
    android:gravity="center"
    android:paddingLeft="30dip"
    android:paddingRight="26dip"
    android:singleLine="true"
    android:text="@string/addsubject"
    android:textSize="13dip" />

Use the app:iconGravity="textStart" attribute in the MaterialButton

    <com.google.android.material.button.MaterialButton
        app:icon="@drawable/ic_add_24px"
        app:iconGravity="textStart"
        ../>

If you want to reduce the padding between the icon and the text just use the app:iconPadding attribute:

    <com.google.android.material.button.MaterialButton
        app:icon="@drawable/ic_add_24px"
        app:iconGravity="textStart"
        app:iconPadding="0dp"/>