Difference(s): Android:src And Tools:src?

Difference(s): android:src and tools:src? If any, when is it considered proper to use tools:src over android:src?

Solution 1:

If you are using android:src in xml during runtime this will show up on the app, whereas if you use tools:src in xml it will show only on the preview of Android studio and not on the runtime of the app.

Solution 2:

If you start to use support library (vectorDrawables.useSupportLibrary = true), change tools:src to tools:srcCompat