Android R cannot be resolved in Ubuntu

DatabaseConnect is the name of the Android Application Project that has been created in Eclipse in Ubuntu Platform.

One of the java file Inside DatabaseConnect->src->co.package.datewithme is shown Below.

 package com.example.datewithme; import android.app.Activity; import android.content.Intent; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.text.InputType; import android.view.View; import android.widget.EditText; import android.widget.ImageView; import android.widget.Toast; public class Login extends Activity{ Intent i=null; ImageView im=null; EditText tv1,tv4; boolean flag=false; SQLiteDatabase db=null; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.login); im=(ImageView)findViewById(R.id.show_hide2); tv1=(EditText)findViewById(R.id.phone2); tv4=(EditText)findViewById(R.id.password2); db=openOrCreateDatabase("mydb", MODE_PRIVATE, null); // db.execSQL("create table if not exists login(name varchar,mobile_no varchar,email_id varchar,password varchar,flag varchar)"); im.setOnClickListener(new View.OnClickListener() { @Override public void onClick(View arg0) { if(flag==false) { im.setImageResource(R.drawable.hide); tv4.setInputType(InputType.TYPE_TEXT_VARIATION_PASSWORD); flag=true; } else { im.setImageResource(R.drawable.show); tv4.setInputType(129); flag=false; } } }); } public void action(View v) { switch(v.getId()) { case R.id.signin2: i=new Intent(this,Signin.class); startActivityForResult(i, 500); overridePendingTransition(R.anim.slide_in_top, R.anim.slide_out_bottom); finish(); break; case R.id.start: String mobile_no=tv1.getText().toString(); String password=tv4.getText().toString(); if(mobile_no==null||mobile_no==""||mobile_no.length()<10) { show("Please Enter Correct mobile number."); } else if(password==null||password==""||password.length()<6) { show("Please Enter Correct Password."); } else { Cursor c=db.rawQuery("select * from login where mobile_no='"+mobile_no+"' and password='"+password+"'",null); c.moveToFirst(); if(c.getCount()>0) { i=new Intent(this,Welcome.class); startActivityForResult(i,500); overridePendingTransition(R.anim.slide_in_right, R.anim.slide_out_left); db.close(); finish(); } else show("Wrong Password or Mobile number."); } break; } } @Override protected void onActivityResult(int requestCode, int resultCode, Intent data) { overridePendingTransition(R.anim.slide_in_left, R.anim.slide_out_right); } public void show(String str) { Toast.makeText(this, str, Toast.LENGTH_LONG).show(); } } 

The error message generated is R cannot be resolved to a variable.But i have R.java file in my Project DatabaseConnect->gen->com.example.Databaseconnect->BuilConfig.java,R.java.

The ScreenShot is shown below.

I Searched all the possibilities for the solution by going through these links. 123

But din't got the proper solution.

I came to know the naming convention got some errors like DatabaseConnect and Datewithme. So i kept the same name to both and then clean and run the project but after that its that its taking previous name itself.

An help is appreciated