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Android Build a Simple Android App (2014) Basic Android Programming Accessing Views in Code

Reed Williams
Reed Williams
3,323 Points
Posted by Reed Williams
Reed Williams
3,323 Points

Build a Simple Android App > Basic Android Programming > Accessing Views in Code

Build a Simple Android App > Basic Android Programming > Accessing Views in Code

Question 1: Why are my Rs red & how can I change this?

Pic: http://screencast.com/t/XRi9b5wpmD

Question 2: When I changed 'Hello World' to 'Did you know?' I did not get a warning as the video suggested, but in fact, got any error. How do I apply the proper resource?

Pic: http://screencast.com/t/hTv6moboWA

Pic: http://screencast.com/t/9cjVMaZA

When I try to run:

Pic: http://screencast.com/t/Hr5y3Lh88v

pic: http://screencast.com/t/YbIkoKGs1em

2 Answers

Yongshuo Wang
Yongshuo Wang
5,500 Points
Yongshuo Wang
Yongshuo Wang
5,500 Points
  1. Press Alt+Enter to get the suggestion from Android Studio.
  2. Run Build => Clean Project.
Reed Williams
Reed Williams
3,323 Points
Reed Williams
Reed Williams
3,323 Points

ALT + ENTER: http://screencast.com/t/umXhcWw0

Clean Project did not seem to work either.

Michael Waihura
Michael Waihura
6,963 Points
Michael Waihura
Michael Waihura
6,963 Points

Hi Reed,

Qn 1. This is a syntax error.The android:id parameter for the TextView requires a value with the format @+id/[idOfView] in this case it should look like this android:id="@+id/factTextView" This tells android to create a new id for our textview.This happens during build and the view is automatically added to the R.java.In your case this is not happening and therefore the error with the R.Fix this in the activity_fun_facts.xml

Qn 2. from the messages view at the bottom of android studio,the error is still the id value."Resource id cannot be an empty string..." fixing the id value i.e android:id="@+id/factTextView" as above will also clear the error.Note:Any view that will be referenced in the FunFactsActivity.java requires an id.

let me know if that works