R.id cannot be resolved [duplicate]

Answer 1

Did you try any of the solutions listed here? R cannot be resolved - Android error

Also, look for your R.java file. Are there any errors with it?

Answer 2

Go in your main.xml file, delete a char and rewrite it. That will generate the R file again.

Answer 3

I ran into this problem when I tried to follow Lars Vogel's Android development tutorial...it turns out my problem is simply because I didn't save the layout file. Once I save the file, it works fine.

Answer 4

I had the same problem when I updated my Android SDK. Suddenly new projects could not generate the R.java file.

• importing my R.java didn't help because it wasn't generated
• cleaning and building the project didn't help either -- the /gen folder was still empty.

I found that after the upgrade, the adb server didn't start up properly. So a manually started it:

$ cd $ANDROID_SDK/platform-tools
$ adb start-server

Then I restarted Eclipse and did a clean/build on the project, which generated the R.java file.

Answer 5

You have to import your R class

import com.TestApp.HelloWebView.R;

Also as Demand posted you have to use a namespace for your layout.

?xml version="1.0" encoding="utf-8"?>
<WebView xmlns:android="http://schemas.android.com/apk/res/android"
    android:id="@+id/webview"
    android:layout_width="fill_parent"
    android:layout_height="fill_parent"/>

Answer 6

import com.TestApp.R; isn't accepted once R is lost.

My Eclipse now auto creates a new "res" folder everytime I "clean". Yes, I have two folders named "res" in parallel directly under my project folder. The auto created one is empty. String values are still found. No other errors than "R cannot be resolved" are reported by Eclipse.