packages/apps/Myfolder/src/com/android/myfolder/MyFile.java:196: package R does not exist
addPreferencesFromResource(R.xml.myfile);
^
packages/apps/Myfolder/src/com/android/myfolder/MyFile.java:344: package R does not exist
menu.add(0, MENU_SAVE, 0, R.string.menu_save)
^
packages/apps/Myfolder/src/com/android/myfolder/MyFile.java:346: package R does not exist
menu.add(0, MENU_CANCEL, 0, R.string.menu_cancel)
^
packages/apps/Myfolder/src/com/android/myfolder/MyFile.java:454: package R does not exist
errorMsg = mRes.getString(R.string.error_empty);
^
packages/apps/Myfolder/src/com/android/myfolder/MyFile.java:458: package R does not exist
errorMsg = mRes.getString(R.string.error_empty);
packages/apps/Myfolder/src/com/android/myfolder/MyFile.java:196: package R does not exist addPreferencesFromResource(R.xml.myfile); ^ packages/apps/Myfolder/src/com/android/myfolder/MyFile.java:344: package R does not exist
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Check if there are any errors in your resource files or any missing dependencies. Either of these will cause the R.java class to not be code-generated and thus a lot of errors like the ones you have shown.