I had R.java file in my android application. But I don\'t know, It is delete some how. To create it again I clean my project and also Rebuild my project by clicking on Build
You can create R.java file using aapt tool by executing following command.
ANDROID_HOME/platform-tools/aapt
package
-v
-f
-m
-S DEV_HOME/res
-J DEV_HOME/src
-M DEV_HOME/AndroidManifest.xml
-I ANDROID_HOME/platforms/android-7/android.jar
Generate Resource java code and packaged Resources
aapt package -f -M ${manifest.file} -F ${packaged.resource.file} -I ${path.to.android-jar.library} -S ${android-resource-directory} [-m -J ${folder.to.output.the.R.java}]
You can find more detail about options on this link
http://www.herongyang.com/Android/Project-aapt-Android-Asset-Packaging-Tool.html