Android file missing in R file

Question

I used Eclipse Helios, but due to performance issues that I changed to Eclipse Galileo, I established an ADT connection and added my sdk folder to Elcipse Preferences. Now R. Java has disappeared from all my projects. How can I fix this, I did Project / Clean, but it will not generate files, there is nothing wrong with my xml, and there is no out.xml in any of my projects.

Thanks in advance

Answer 1

I had the same problem today and figured it out. The reason for this often occurs when external / sample files are included, because often these examples refer to layouts in your application, but do not have access to the package and therefore cannot see the R.java file in this package. so that everything is clear, here is the beginning of the R.java file:

/* AUTO-GENERATED FILE. DO NOT MODIFY. * * This class was automatically generated by the * aapt tool from the resource data it found. It * should not be modified by hand. */ package com.conceptualsystems.dashboard; public final class R { public static final class attr { } public static final class drawable { public static final int csc_logo=0x7f020000; public static final int icon=0x7f020001; } public static final class id { public static final int activation_code=0x7f070012; public static final int alpha_bar=0x7f07000b; public static final int alpha_label=0x7f07000a; 

Please note that the package name is any package name of your application..java files that are not included in this package (i.e. your sample code that you just ran) should explicitly reference this package file as follows:

 package com.example.android.apis.graphics; import android.app.Dialog; import android.content.Context; import android.graphics.*; import android.os.Bundle; import android.text.Editable; import android.text.TextWatcher; import android.view.View; import android.view.View.OnClickListener; import android.widget.Button; import android.widget.EditText; import android.widget.ImageView; import android.widget.SeekBar; import com.conceptualsystems.dashboard.R; 

the last line is the one to pay attention to. after importing the resources explicitly, the resources will be available in your sample code.

Answer 2

In my experience there is an error in xml. Eclipse will surely tell you where. After correction, error R.

Answer 3

Sometimes when you clean up the project, the R file disappears, I had the same problem.

How I fixed this:

-Make sure that all "import android.R" has been deleted -Clean again (if this does not fix, restart eclipse and try again)

or

-Put pointers to the R file in the comment fe // setContentView (R.layout.main); -If all pointers to the R file are in a comment, you should only get warnings in the file and, hopefully, errors somewhere else. -Set errors and then uncomment pointers. Sometimes eclipse ignores some errors and discards the R file and then says nothing about it, which is annoying, but it will fix it. :)

-If this still does not work, you can try to create a new project and copy its code.

Answer 4

created a new project in eclipse, then I imported sample files into it, but still the same error. You might want to try the following:

• In Eclipse -> Right-click on the project -> Android Tools -> Fix Project

• make sure all resources are lowercase.

Answer 5

In the project drop-down menu, try to unlock and click the build project again, closing the program each time. There were some errors about this for a while, but a fix was not always installed.

When this happened to me, it turned out that it was because I named the XML file with a capital letter. Worth checking out.

Answer 6

I had this problem when upgrading from Eclipse / Helios to Eclipse / Juno.

I installed the IDE and then imported the existing (working) project. If I then ran it in the emulator, it started, but in the original version, although the java code was for the latest version.

Then I did a cleanup (as explained in many other posts) and build (re), but then hit with a lot of errors due to the Smissing R.java file.

The problem turned out to be some “errors” in the layout XML files that were not recognized by Eclipse / Helios. In particular, in my case, there were some layout_width = 'match-parent' (and height) parameters that Juno objected to. I tried to modify them directly in the xml files, but Juno did not have this and still reported it as a "match-parent" error (although this was explicitly changed).

The only thing to do is go to the graphic layout, right-click to get the properties, and then change the Width and Height properties. Also, since they were already showing as “fill-parent”, I had to change them to “wrap-content” first and then change them to “fill-parent”.

Once I did this for all instances of "parent-parent", I could build and run the latest version in the emulator.

Answer 7

There are errors in res. After I have the same XML files in the layout and menu, generate a crash not created by R.java.

Answer 8

To localize the correct import of package R., it should be in your packages.

ex. import com.yourdomain.test.R;

Answer 9

Here, the Android ADT project is slightly different from a regular Java project. An android project requires a constantly updated permanent R.java file . Among other things, the R.java file contains all the resource identifiers that are contained in your application and maintains interface consistency.

So first, make sure the R.java file is created for your Android project.

• To find this, first go to the beginning of ADT (Eclipse) and clear the project PROJECT-> CLEAN
• If the "Create automatically" checkbox is selected, an R.java file must be created.
• To confirm, you can simply search for the file in the project folder. You will not find it if you did not create it.
• If R.java is not created, there is a 90% chance that there are some problems with one of your * .xml interface files . Usually it is in res-> layout-> activityXXXX.xml

Fix the / s interface file (try to make it very simple with a single button or something else) and the R.java file will be automatically created by ADT. At this point, you should start to notice R.layout.XXXX errors in your main program / actions. This is good, because now you can create / rename the correct layout elements and fix your project.

Only my 2 cents ....

Answer 10

the same thing happened to me, error checking in res xml files and changing the target 1.5-2 android (in my case) is fixed, this usually happens to me when importing external code or online code from examples or other developers.

Answer 11

Hi, I happened to me this weekend.

The actual reason for this was because I turned off the update option for Android in the settings, as it did not work with the previous version of Eclipse. Now, although the eclipse seemed to work fine when I had a PROJECT-> CLEAN project, R.java was missing.

Try re-selecting the Android update option (WINDOW → PREFERENCES → INSTALL / UPDATE).

This completely solved my problem, and I did not have to deal with any problem of scanning every line from my many XML files or my image resources.

Hope this helps someone :)

Answer 12

I just ran into the same problem.

It turned out that my Source control inserted the Addd section → → → → → → → →> into my manifest file.

All I had to do was fix the manifest file, and then all the errors went away.

Answer 13

This happened to me, adding some new resources to my project. An R file is created after each resource update.

The error in my case was the wrong file name. One of the image resources had a capital letter in its name, which prevented the assembly of the R file. Changing the name just worked.

I would suggest that when you add too many resources at a time, just make sure the naming conventions for them are. Its easy to miss such things.

Resource Agreements: http://developer.android.com/guide/topics/resources/providing-resources.html

Answer 14

I had a similar problem. This was because I saved the picture file picture.jpg as picture.png, as soon as I changed the name to the previous one, it started working. hope this helps someone in the future