Need Help for SQLite Database where clause query

Hii I am trying to get a value from listview from one activity and pass that value into where clause in sqlite query in another activity. But when I query gets executed it gives Unfortunately app has stopped working error. Code is as follows:

import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.database.sqlite.SQLiteDatabase;
import android.os.Bundle;
import android.widget.TextView;
import android.widget.Toast;

public class newclass extends Activity {
    private static final Context Context = null;
    SQLiteDatabase db1=null;
    private static String DBNAME ="PERSONS.db";
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.newacti);
        TextView Textv = (TextView)findViewById(R.id.tv1);
        Intent iin= getIntent();
        Bundle b = iin.getExtras();
        db1 = openOrCreateDatabase(DBNAME,Context.MODE_PRIVATE,null);
        if(b!=null)
        {
            String j =(String) b.get("name");
            Textv.setText(j);
//Below 2 lines gives an error "Unfortunately app has stopped working error"
            String sqlQuery = "select * from TBUSER where ID='"+ j+"'";
            Toast.makeText(Context, sqlQuery, Toast.LENGTH_LONG).show();
            /*db1 = openOrCreateDatabase(DBNAME,Context.MODE_PRIVATE,null);
            Cursor c= db1.rawQuery(sqlQuery, null);
            if (c != null && c.moveToFirst()) {
                do {
                    //do something
                } while (c.moveToNext());
        }*/

        } 
    }

}

Can anybody say me whats an error. Thank You in Advance.