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The students who just entered the studio have encountered many problems . This is the problem I once encountered. I hope I can help you. If it helps, please remember to praise it

Rendering Problems

The following classes could not be found: – android.support.v7.internal.app.WindowDecorActionBar (Fix Build Path, Create Class)

Tip: Try to build the project.

solutions:

The reason for this problem is that in the growth of studio, the actionbar has been out, and it recommends that you use the toolbar

Solution 1:

Find the project directory RES/values/ststyles.xml, and prepare to modify the apptheme settings
to find the property parent = “theme. Appcompat. Light. Darkactionbar” and change it to parent = “base. Theme. Appcompat. Light. Darkactionbar” is to add the prefix “base.” to the original parent property value

Modified screenshot:

OK, when you return your layout file, it’s OK

Solution 2: change the API version as shown in the figure, and change to a lower version of the API

Solution 3: similar to method 1, only change the value of parent to something else, and change it to theme. Appcompat. Light. Noactionbar