I\'ve found out that my R.java is never updated, so it doesn\'t contain information about my new resources, so I decided to delete it and thought that Eclipse would generate
Android has added in SDK build tool ADT 22 for the building mechanism. You just need to do the following steps.
This will solve the issue.
R.java will never be generated if there are any errors in the res
folder. For example, in the drawable subfolder there are two files which have the same name, one is icon.png and the other is icon.html.
You can see some error in the Eclipse console log window which is saying "Resource entry icon is already defined.". After deleting icon.html, you can clean or just delete the gen
folder. You will find that R.java is created.
This site suggests:
if you run a clean on the project it should regenerate all the generated Java files, namely R.
...and...
In Eclipse, under the Project menu, is an option build automatically. That would help you build the R.java file everytime modifications are made. The Clean... option is also there under Project.
This site suggests another solution.
I found this happening to me with a broken layout and everything blows up. Relax, it's like that old mistake when you first learned programming C where you forget one semicolon and it generates a hundred errors. Many panic, press all the buttons, and makes things worse.
R.
links to is not broken. Fix all errors in your XML files. If anything in the ADKs are broken, R
will not regenerate.import android.R
in your activity, remove it.Menu -> Project -> Build Project
.This usually happens when you have a broken XML file.
/res/
folder/layout/
and /values/
, especially if you've changed one of them recentlyAndroidManifest.xml
. I find that often I change a string and forget to change the string name from AndroidManifest.xml
.Android SDK Build-tools
is installed. Window -> Android SDK Manager -> Tools -> Android SDK Build-toolsAndroid SDK Tools
, you also update the Android SDK Platform-tools
and Android ADK Build-tools
. Build fails silently if they don't match.Make sure you are not importing
android.R;
My problem was inside a menu file.
The compiler doesn't seem to warn you if strings which do not exist inside strings.xml
are referenced in menu files. Check if your item
s in your menu XML files reference any strings which do not exist in your strings.xml
. Usually in android:title
.