@id is not working inside Relative Layout

Question

As far as I know, the difference between @+id and @id is to create a resource id first time and reuse that already existed resource id in different places. For instance, If we have a Relative layout having two textViews one below another, we shall use @resourceId for the second textView which refers to the first TextView. The problem is, after updating the android studio to 3.0, @resourceId is not working anymore.To place second textView below the first one, I need to use @+firstTextViewId instead of @firstTextViewId. More specifically I need to use,

android:layout_below="@+id/totalQty"

instead of

android:layout_below="@id/totalQty"

Here is the code

<RelativeLayout
    android:id="@+id/relBottomLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true">
    <TextView
        android:id="@+id/totalQty"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="abcdef"/>
    <TextView
        android:id="@+id/totalPrice"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/totalQty"
        android:text="saasdfdsdfsdf"/>

    <TextView
        android:id="@+id/totalNetPrice"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@+id/totalPrice"
        android:text="abcdsadfsafddgfdgfgdef"
        />
</RelativeLayout>

Is it an understanding issue? or a problem from any end? Can anyone please explain?

Answer 1

I just remove + sign at @+id from your code. Here's the updated code

<RelativeLayout android:id="@+id/relBottomLayout"
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_alignParentBottom="true"
    xmlns:android="http://schemas.android.com/apk/res/android">
    <TextView
        android:id="@+id/totalQty"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:text="abcdef"/>
    <TextView
        android:id="@+id/totalPrice"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/totalQty"
        android:text="saasdfdsdfsdf"/>

    <TextView
        android:id="@+id/totalNetPrice"
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_below="@id/totalPrice"
        android:text="abcdsadfsafddgfdgfgdef"
        />
</RelativeLayout>