aapt (Android Asset Packaging Tool) auto-generates R.java file. This file contains resource IDs for all the resources of res/ directory.
activity_main.xml file contains many components. For these each specific component, id is automatically created in this file. This id can be used in the activity source file to perform any action on the component.
If R.jar file is deleted, automatically it will be created by android.
activity_main.xml file contains many components. For these each specific component, id is automatically created in this file. This id can be used in the activity source file to perform any action on the component.
If R.jar file is deleted, automatically it will be created by android.
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