why from my eclipse R file is deleted?

Gen folder is in project explorer but R file is not there. it showing error on the (R.layou.main).

package org.example.Wardrobe;

import android.app.Activity;
import android.os.Bundle;

public class Start extends Activity {
    /** Called when the activity is first created. */
    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceSt开发者_如何学Pythonate);
        setContentView(R.layout.main);
    }
} 

---

Just do a clean from Project->Clean and then Build the project again. That should get the R class generated again and your errors should disappear.

---

There will be some error in one of your xml file. fix that error, save your project and rebuild. R. java will be created.

---

Generally when Eclipse doesn't generate the R.java file is when there is a problem occuring somewhere. Do you really have a main.xml layout? If you are sure that everything is fine, do a Project -> Clean and everything should be fine.

---

try one more time create one more project then check R.java exist or not.if not then there is some problem in installation process.i installed and R.java file exist in it.