Related
I keep getting this error. Should I just make id a field?
My code is:
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.main);
ImageView mainimage = (ImageView) findViewById(R.id.mainanim);
mainimage.setBackgroundResource(R.anim.mainanim);
mainanimation = (AnimationDrawable) mainimage.getBackground();
}
How exactly do you fix this?
Look at your import statements at the top. If you are saying import android.R, then there that is a problem. It might not be the only one as these 'R' errors can be tricky, but it would definitely definitely at least part of the problem.
If that doesn't fix it, make sure your eclipse plugin(ADT) and your android SDK are fully up to date, remove the project from the emulator/phone by manually deleting it from the OS, and clean the project (Launch Eclipse->Project->Clean...). Sounds silly to make sure your stuff is fully up to date, but the earlier versions of the ADT and SDK has a lot of annoying bugs related to the R files that have since been cleared up.
Just FYI, the stuff that shows up in the R class is generated from the stuff in your project res (aka resources) folder. The R class allows you to reference a resource (such as an image or a string) without having to do file operations all over the place. It does other stuff too, but that's for another answer. Android OS uses a similar scheme - it has a resources folder and the class android.R is the way to access stuff in the android resources folder. The problem arises when in a single class you are using both your own resources, and standard android resources. Normally you can say import at the top, and then reference a class just using the last bit of the name (for example, import java.util.List allows you to just write List in your class and the compiler knows you mean java.util.List). When you need to use two classes that are named the same thing, as is the case with the auto-generated R class, then you can import one of them and you have to fully qualify the other one whenever you want to mean it. Typically I import the R file for my project, and then just say android.R.whatever when I want an android resource.
Also, to reiterate Andy, don't modify the R file automatically. That's not how it's meant to be used.
Do not modify the R class. The error means there's something syntactically wrong with your XML layouts and R cannot be auto-generated. Try looking there and post the xml code you're not sure about, if any.
Edit : also: remove "import android.R" from imports at top of file (if there)
One possible solution:-
Summary: make sure you are using import com.yourpkgdomainname.yourpkgappname.R instead of import android.R
Details: The problem occured when I changed ID of a label which was being referred in other places in the layout XML file. Due to this error, the R file stopped generating at first. Eclipse is bad in handling errors with the layout files.
When I corrected the ID reference (with project clean few times and Eclipse restarts, I noticed that my import packages now has:
import android.R
Changing it to following fixed the error:
import com.example.app.R
I just fixed my problem right-clicking in the layout folder and clicking in the option Validate. Some windows will appear, you just clik OK and ist fine.
May be you created a new xml file in Layout Directory that file name containing a Capital Letter which is not allowed in xml file under Layout Directory.
Hope this help.
Just throwing this out there, but try retyping things manually. There's a chance that your quotation marks are the "wrong" ones as there's a similar unicode character which looks similar but is NOT a quotation mark.
If you copy/pasted the code snippits off a website, that might be your problem.
As Jake has mentioned, the problem might be because of copy/paste code.
Check the main.xml under res/layout. If there is no id field in that then you have a problem.
A typical example would be as below
<com.androidplot.xy.XYPlot
android:id="#+id/mySimpleXYPlot"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginTop="10px"
android:layout_marginLeft="20px"
android:layout_marginRight="20px"
title="A Simple Example"
/>
Some times eclipse may confuse with other projects in the same directory.
Just change package name (don't forget to change in Android manifest file also), ensure the package name is not used already in the directory. It may work.
Just came across this myself.
Finally found my issue was with a .png file that I added that had a capital letter in it an caused exactly the same problem. Eclipse never flagged the file until I closed it and opened Eclipse back up.
What seems to be the problem, I just fixed mine in case anyone was wondering - Due to other errors i turned off build automatically, when i created a new project it said R.layout.main had an issue and needed to import R; So naturally as a novice, i did. Then i built manually and it had a problem with main. Try building your program as is, remove import R and it should be fine.
In main.xml (or wherever your item is defined) make sure that the ID for the R item is defined with #+id/... Here is an example with a button:
<Button android:text="B1" android:id="#+id/button_one"
android:layout_gravity="center_horizontal|center"
android:layout_height="fill_parent" android:layout_width="wrap_content" />
Each of these is important because:
# must precede the string
+ indicates it will create if not existing (whatever your item is)
I also had this error when I was working in a Java class once. My problem was simply that my xml file, with the references in it, was not saved. If you have both the xml file and java class open in tabs, check to make sure the xml file name in the tab doesn't have a * by it.
Hope this helps.
Just Clean your project so R will be generated automatically. This worked for me.
It gave me enough pain but I found the solution:
PROJECT ---> Clean ----> (Sele)
I had this problem but in my case it solved by restarting the eclipse.
For me the cause of the problem was that I had 2 images with the same name in my drawable-hdpi folder. Once I resolved that, then the R.java rebuilt itself and the problem was automatically solved.
select Project tab and click Build automatically so Build all option will be activated and then click on build all.and always start xml file name with lowercase.
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.
I'm using Eclipse. Say I have a project 'ProjectA' in the eclipseworkspace (in a folder ProjectA). I want to copy the project but with a new name (ProjectB) and have all the references in the new project adjusted. I can't find much help for what I thought would be a vary basic operation. I want to try out variations on the original design/code and creating a copy seemed the obvious way to go about it.
Any suggestions please.
Copy your project to a new one (Ctrl+c & Ctrl+v).
Change the package-name in your manifest
Rename your main package with refactor. Don't forget to select.
Change your application name in manifest
application android:icon="#drawable/icon" android:label="**new name**"
I just want to add an item to Mur Votema's list:
5) Don't forget to open the project you want to copy!
It just cost me some minutes to find out that it doesn't work with closed projects. :-)
If you are using Eclipse and all you want to do is clone your Android project and give it a new project name, simply do the a copy/paste (Ctrl-C & Ctrl-V - step 1 in Mur's answer above). Eclipse will ask you for a new project name when you paste and you're done. The Eclipse project name and directory are independent of the application name and package.
Mandatory tasks:
In Eclipse, Copy and paste the project. (Give the project a new name)
In Manifest, update the Package name and save. (Update Launch
Configuration)
Refactor and rename the Package name. (Update references)
Optional tasks:
In Manifest, change the Application label and icon, so after
installing the application on your device it won't be confused with
the first one.
Refactor and rename the java files name, so they won't be confused
with the original project files.
If you have used Encodings such as UTF-8 in your project (in order
to handle languages other than English) you might need to edit
and save those files so their font would be shown correctly.
Note: If you do the 3rd task before 2nd task, some undesired imports would be added to your java classes. You then will need to remove those imports.
There's now an automatic tool for that, part of the ADT.
Make sure the origin project is open in Eclipse, copy & paste to a new name
Right click on the new project > Android Tools > Rename Application Package
Done
As said above all you have to do is copy+paste the project and rename it ["myApp.11"] but sometimes this feature gets bugged in eclipse. One such case happens when you have more than one version of the jdk. to solve this close eclipse rename the older versions of the jdk with an underscore e.g. _jdk17.2
and retry. if you dont need these versions delete them.
Another thing I noticed is that if you leave android:label="#string/app_name" it somehow keeps the original app name when you view the copied app in the list of Applications in Settings > Applications > Manage applications but if you change it to android:label="Your App Name" it seems to work ok.
Also be sure to change your icons properly by deleting the old ones and importing the new ones.
I went to the workspace folder on C:/ (path different for all) copied the project folder (Project A), and pasted it with a new name (Project B). Change the name while in explorer. Then, through Eclipse, made a new android project with the new name (Project B). Different way of doing it.
I Just wanted to add this after struggling with a code i have at work:
DO NOT USE THE PACKAGE NAME EXPLICITLY IN YOUR JAVA CODE NO MATTER WHAT. YOU MIGHT NEED TO RENAME YOUR PROJECT .
EXAMPLES ARE : getResource() and setting the Bitmap source and such and such
it looks like that I had bad references to the package name. it name was used explicitly as a String (e.g "com.pakge.mypkg" ) instead of Context.getPackageName() .
try to reach this method anyways you can 'cos the way i just mentioned it might not work for you... try to reach the method name "getPackageName()" from different other objects.
I have to answer not comment as reputation not high enough - to say that I agree #jengelsma has the best answer, just copy and paste, but watch out for the (hidden) SVN files (in .svn folders)! Unless you want the same references as the other project you don't want these.
Team > disconnect and check 'also delete SVN meta data' on your new copy to do this.
Just want to add some more points :-
Be ensure that the package name must be different for new project and old project if both project are going to install on same machine.
also modify the same in Mainfest.xml
under
I used the eclipse Luna, I tried to copy an existing project (Project_A) as below
Create a new Java project (its name is as Project_B)
Right click on Project_B (to pop up the context menu)
Select the menu item "Import..." (to show the "Import" dialog)
On the list under the "Select an import source" field to extend the item "General"
Double click on the sub-item "File System" (to show the "File System" page)
Enter the path of "Project_A" directory into the "From directory" field (or click the "Browse..." button to find and select the directory of "Project_A")
Check the checkbox of "Project_A" directory under the "From directory" field
To see if the "Into folder" field is showing folder name as "Project_B" (if not, click "Browse..." button to find and select the "Project_B")
Click the "Finish" button (because the Project_B is empty, need not care any more)
The all contents of Project_A are copied into Project_B, we can run the Project_B as the Project_A (if needed we can refactor the Project_B)
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
I keep getting this error. Should I just make id a field?
My code is:
public void onCreate(Bundle icicle)
{
super.onCreate(icicle);
setContentView(R.layout.main);
ImageView mainimage = (ImageView) findViewById(R.id.mainanim);
mainimage.setBackgroundResource(R.anim.mainanim);
mainanimation = (AnimationDrawable) mainimage.getBackground();
}
How exactly do you fix this?
Look at your import statements at the top. If you are saying import android.R, then there that is a problem. It might not be the only one as these 'R' errors can be tricky, but it would definitely definitely at least part of the problem.
If that doesn't fix it, make sure your eclipse plugin(ADT) and your android SDK are fully up to date, remove the project from the emulator/phone by manually deleting it from the OS, and clean the project (Launch Eclipse->Project->Clean...). Sounds silly to make sure your stuff is fully up to date, but the earlier versions of the ADT and SDK has a lot of annoying bugs related to the R files that have since been cleared up.
Just FYI, the stuff that shows up in the R class is generated from the stuff in your project res (aka resources) folder. The R class allows you to reference a resource (such as an image or a string) without having to do file operations all over the place. It does other stuff too, but that's for another answer. Android OS uses a similar scheme - it has a resources folder and the class android.R is the way to access stuff in the android resources folder. The problem arises when in a single class you are using both your own resources, and standard android resources. Normally you can say import at the top, and then reference a class just using the last bit of the name (for example, import java.util.List allows you to just write List in your class and the compiler knows you mean java.util.List). When you need to use two classes that are named the same thing, as is the case with the auto-generated R class, then you can import one of them and you have to fully qualify the other one whenever you want to mean it. Typically I import the R file for my project, and then just say android.R.whatever when I want an android resource.
Also, to reiterate Andy, don't modify the R file automatically. That's not how it's meant to be used.
Do not modify the R class. The error means there's something syntactically wrong with your XML layouts and R cannot be auto-generated. Try looking there and post the xml code you're not sure about, if any.
Edit : also: remove "import android.R" from imports at top of file (if there)
One possible solution:-
Summary: make sure you are using import com.yourpkgdomainname.yourpkgappname.R instead of import android.R
Details: The problem occured when I changed ID of a label which was being referred in other places in the layout XML file. Due to this error, the R file stopped generating at first. Eclipse is bad in handling errors with the layout files.
When I corrected the ID reference (with project clean few times and Eclipse restarts, I noticed that my import packages now has:
import android.R
Changing it to following fixed the error:
import com.example.app.R
I just fixed my problem right-clicking in the layout folder and clicking in the option Validate. Some windows will appear, you just clik OK and ist fine.
May be you created a new xml file in Layout Directory that file name containing a Capital Letter which is not allowed in xml file under Layout Directory.
Hope this help.
Just throwing this out there, but try retyping things manually. There's a chance that your quotation marks are the "wrong" ones as there's a similar unicode character which looks similar but is NOT a quotation mark.
If you copy/pasted the code snippits off a website, that might be your problem.
As Jake has mentioned, the problem might be because of copy/paste code.
Check the main.xml under res/layout. If there is no id field in that then you have a problem.
A typical example would be as below
<com.androidplot.xy.XYPlot
android:id="#+id/mySimpleXYPlot"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_marginTop="10px"
android:layout_marginLeft="20px"
android:layout_marginRight="20px"
title="A Simple Example"
/>
Some times eclipse may confuse with other projects in the same directory.
Just change package name (don't forget to change in Android manifest file also), ensure the package name is not used already in the directory. It may work.
Just came across this myself.
Finally found my issue was with a .png file that I added that had a capital letter in it an caused exactly the same problem. Eclipse never flagged the file until I closed it and opened Eclipse back up.
What seems to be the problem, I just fixed mine in case anyone was wondering - Due to other errors i turned off build automatically, when i created a new project it said R.layout.main had an issue and needed to import R; So naturally as a novice, i did. Then i built manually and it had a problem with main. Try building your program as is, remove import R and it should be fine.
In main.xml (or wherever your item is defined) make sure that the ID for the R item is defined with #+id/... Here is an example with a button:
<Button android:text="B1" android:id="#+id/button_one"
android:layout_gravity="center_horizontal|center"
android:layout_height="fill_parent" android:layout_width="wrap_content" />
Each of these is important because:
# must precede the string
+ indicates it will create if not existing (whatever your item is)
I also had this error when I was working in a Java class once. My problem was simply that my xml file, with the references in it, was not saved. If you have both the xml file and java class open in tabs, check to make sure the xml file name in the tab doesn't have a * by it.
Hope this helps.
Just Clean your project so R will be generated automatically. This worked for me.
It gave me enough pain but I found the solution:
PROJECT ---> Clean ----> (Sele)
I had this problem but in my case it solved by restarting the eclipse.
For me the cause of the problem was that I had 2 images with the same name in my drawable-hdpi folder. Once I resolved that, then the R.java rebuilt itself and the problem was automatically solved.
select Project tab and click Build automatically so Build all option will be activated and then click on build all.and always start xml file name with lowercase.