I'm creating an Android Library Project, and I have a class in which the programmer has to pass an R.layout.some_layout, to the instance, in which some view should have an #+id/text
So the idea is that I create an XML layout file, I add a view with an "text" as its ID, and after I instantiate the class I use object.setLayout(R.layout.some_layout);
In the definition of the class there is something like this:
public void setLayout(int layoutId) {
View view = findViewById(R.id.text); // error here cause of the R.id
}
The problem is that since it's a library project, my R.java doesn't have an R.id, so it marks an error on that line. Any ideas of how to do this?
There must be an error in one of your xml file
Kindly check your xml may be some syntax error remain with the xml file which is preventing to create complete R.java
Then
Clean & Rebuild your project and also you can Restart IDE if problem remains
Did you check if your R.java file was generated correctly? If not, please clean build your library project and check again.
Related
I have just added an activity to my project (from the options) in eclipse called Dlg as a result a Dlg.java file was created along with a activity_dlg.xml. Also added the activity in the AndroidManifest.xml however eclipse has placed a small cross next to the Dlg.java file and activity_dlg has been underlined in
setContentView(R.layout.activity_dlg);
and it states activity_dlg cannot be resolved or is not a field. Why is this happening all of a sudden. I Added activites a while ago and they were fine.
Any suggestions ?
The "cannot be resolved or is not a field" error on the R class indicates that the changes you made (addition of the layout xml) is not reflected in the generated file. You can clean the project using menu Project -> Clean... to force re-generation of the R class.
It probably means that for whatever reason the R.java file, which is automatically generated, isn't generated or incomplete.
This usually means you have an error in your xml file.
Assuming that activity_dlg.xml actually exists, you probably have an error in there.
Maybe its referencing to an image or string which doesn't exists?
Open it up and check it carefully, not always does the xml reader underline errors.
If you can't find anything you can always try to clean your projects or restart eclipse, but that probably won't help.
I think the newly added activity_dlg.xml is not associated with an id in R.java file.
Confirm this by going to R.java. Under this you have something like:
public static final class layout {
public static final int activity_dlg=0x7f030000;//This is some id to your layout
}
If this is not present then u can right click on the project directory from eclipse and refresh. or Project->Clean to regenerate the R.java file.
I am having a strange error that I can not resolve in class R.java in my android application
the error is in the following line
public static final class string {
public static final int =0x7f05002f;
because it has no variable after the int
can anyone help me please with this error ?
R.java is auto-generated, and is not meant to be edited manually.
If you face issues, delete R.java and rebuild your project and it will be generated again, according to your layout.
If problem persists, look into your xml files ( strings.xml, layout.xml, etc) for any errors.
check your strings.xml file.It seems like you have saved some value without assigning any name to that.
Look for an entry not having any name attribute. something like <string>8</string>, either remove that or assign a name attribute to that like <string name="anyname">8</string>
A bad R.java would mean an error somewhere else. If deleting it and rebuilding the projetc doesn't solve it look at your manifest and other xml resources for errors.
I am writing a simple application to get familiar with android programming. Today I want to play with menus. I follow this page!. I first create "menu" folder under "res" and then add "game_menu.xml" in it. However this "R" thing can't get that folder. I tried some refresh to get it 'auto-generated' but it didn't work. I clean for a rebuild, but this time R.java completely dissappeared. How can I make eclipse to recreate R or what is the problem?
Are you sure the R is not creating the appropriate link for the menu?
To find your xml menu, you must type: "R.menu." & hit ctrl+space and all your menu's will pop up.
Try this way.
And if you want to check your R file, if its creating the menu link, search for:
"public static final class menu" in R file
In that class you will find your xml menu's..
are you able to compile ? Check which R you have imported in your code. It should not be the android.R but the one from your project
You have most likely misspelled something in your xml file, or have some other error. If the xml files are not entirely correct (or other resource files), the R. file cannot be built. Go through the file and make sure that everything is error free.
A common mistake is to name the resources with capitals, although the names can only contain small letters.
another common mistake is to use unsupported folder names.
The library project looks fine, but as soon as I import it to my main project, it shows me errors on each line which is referencing a resource:
id cannot be resolved or is not a field
The main project shows no errors.
Of cause I ask myself where android knows where to import the resources from e.g. in lines like that:
RelativeLayout menuLayout = (RelativeLayout) this.findViewById(R.id.menu_layout);
But this works neither:
RelativeLayout menuLayout = (RelativeLayout) this.findViewById(net.bla.library.R.id.menu_layout);
Any Ideas?
EDIT: what I found out is:
As soon as I include the library project, Eclipse duplicates the gen/net.mylibrary.R from the library into the main app (so there are 2 packages in the gen folder now: the one from the app, and the copied one from the library). strange thing is: R.id is not found in the copy. There are some other differences too, like the copy uses an additional "final" for its definitions.
I really have no clue why this might happen. Someone?
Eclipse sometimes likes to import android.R, and this causes errors similar with you are experiencing.
Look for the import at the top of the file, and remove it.
As it's stated on "Using Eclipse | Android Open Source":
Note: Eclipse sometimes likes to add an import android.R statement at the top of your files that use resources, especially when you ask eclipse to sort or otherwise manage imports. This will cause your make to break. Look out for these erroneous import statements and delete them.
I had a similar problem and I managed to resolve it.
Here is what I did:
When I call the main activity of my library project, the activity's onCreate method calls setContentView method and uses R.layout.main as a parameter.
getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.main);
Button btn = (Button) findViewById(R.id.main_button1);
btn.setOnClickListener(this);
findViewById returned null.
It seems that main.xml of the library project is being overriden by the main project's main.xml.
So I simply created a new xml layout main_libname.xml with the same content as library's main.xml and used this layout as a parameter for setContentView.
It did work!
Check out if the resources are inside the res folder. All the resources must be inside.
0 Proyect
0.1 src
0.2 res
0.2.1 layout
0.2.1.1 main.xml
0.2.1.2 menu_layout.xml
0.2.2 drawables
.....
Maybe you are putting the data in project folder.
I was also having the "cannot find symbol variable ..." error on a R.id item defined in a library project. Notably, only R.id symbols were not resolvable in the main project even though the other R fields (eg. R.layout) were clearly visible.
Fortunately, I was able to stumble upon on a solution. It turned out that in my case, I had a resource (a layout file) defined in my main project which had exactly the same name as that in the library project.
This was what this looked like filesystem-wise:
top_level_project
main_android_proj
src
main
res
layout
activity_main.xml
android_library_subproject
src
main
res
layout
activity_main.xml
My sub-project's activity_main.xml had an id like so:
<RelativeLayout....>
<TextView android:id="#+id/special_text" ... />
</RelativeLayout>
And this is how I try to reference the id in my main project's java code:
MainActivity.java:
public void onCreate() {
setContentView(R.layout.activity_main);
TextView tv = (TextView) findViewById(R.id.special_text);
tv.setText("Hello Android");
}
To fix this issue, I renamed the offending file in my main project to something else.
It seems that you can't have duplicate layout names in your resources.
Indeed, the sdk docs do point out that you should be careful with resource name conflicts when using library projects:
Resource conflicts
Since the tools merge the resources of a library
project with those of a dependent application project, a given
resource ID might be defined in both projects. In this case, the tools
select the resource from the application, or the library with highest
priority, and discard the other resource. As you develop your
applications, be aware that common resource IDs are likely to be
defined in more than one project and will be merged, with the resource
from the application or highest-priority library taking precedence.
How do I fix this? I already tried removing the R.java and cleaning the project via eclipse, but it doesn't help.
FYI I am trying to get PhotoStream from here: http://code.google.com/p/apps-for-android/, but so far it has been very difficult to get things work.
Okay..... 5 mins later google tells me the correct answer...
http://www.fairtec.at/en/it-blog-mainmenu-16/168-the-type-r-is-already-defined
I just didnt search hard enough.
"The type R is already defined"
That's the message you get in Eclipse if you try to build the Funambol Android Sync Client.
Reason is that you have checked two Builders that try to generate the same class.
You just have to uncheck the Java-Builder from Project->Properties->Builders.
Then the application even works fine in the Emulator.
Delete the R.java from the src folder and rebuild the project. This file will be automatically rebuit during this process.
http://www.fairtec.at/en/it-blog-mainmenu-16/168-the-type-r-is-already-defined
click right to project click properties
Project->Properties->Builders.
unckeck java Builder
delete file R.java
You may want to change your package names. It looks like you are using a 'PhotoStream'.jar which has it's R.class defined at the same package structure as you.
Here is a link to the R.java from the project on Google Code. Notice you are using the same package:
http://code.google.com/p/apps-for-android/source/browse/trunk/Photostream/src/com/google/android/photostream/R.java?r=83
I had the same issue when I imported a project from work. Turning off the Java builder as suggested in the article you found fixed my problem, but when I made code updates they were not reflected in the running app. In my case there was an R.java in my source which I deleted and that fixed my problem.
In my case,
as i m not using any IDE for programming but using command line Android..
i had two xml files, one in layout and other in layout-land. i was using same id "XXX" for both but while declaring i made small mistake
android:id="#+id/XXX" (in layout xml)
android:id="#+id/XXX " (in layout-land xml)
please observe extra space in second id declaration, so while creating R.java they were different and in R.java i had
public static final int XXX=0x7f040046;
public static final int XXX =0x7f040045;
which are same, so please be aware of extra spaces. Thank you