title: Values showing are null
body: <p>i have created a simple app to learn sqlite in android.
  But when i click on the showdata button i get null values</p>
  
  <p>MainDB.java</p>
  
  <pre><code>package com.example.logintp;
  
      import java.util.List;
  
      import android.R.layout;
      import android.app.Activity;
      import android.os.Bundle;
      import android.view.View;
      import android.view.View.OnClickListener;
      import android.widget.Button;
      import android.widget.EditText;
      import android.widget.TextView;
  
      import com.example.logintp.R.id;
  
      public class MainDB extends Activity {
          TextView name, password,show1;
          EditText etname, etpassword;
          Button save,show;
          String s1, s2;
  
          @Override
          protected void onCreate(Bundle savedInstanceState) {
              super.onCreate(savedInstanceState);
              setContentView(R.layout.activity_main);
              final DbClass db = new DbClass(this);
              name = (TextView) findViewById(R.id.name);
              password = (TextView) findViewById(R.id.password);
              show1=(TextView) findViewById(R.id.show);
              etname = (EditText) findViewById(R.id.etName);
              etpassword = (EditText) findViewById(id.etPassword);
              save = (Button) findViewById(R.id.save);
              show=(Button) findViewById(R.id.Display);
              show.setOnClickListener(new OnClickListener() {
  
                  @Override
                  public void onClick(View v) {
                      // TODO Auto-generated method stub
                      String data=db.showAll();
                      show1.setText(data);
  
                  }
              });
              save.setOnClickListener(new OnClickListener() {
  
                  @Override
                  public void onClick(View arg0) {
                      // TODO Auto-generated method stub
                      s1 = etname.getText().toString();
                      s2 = etpassword.getText().toString();
                      long id = db.insertData(new Login(s1, s2));
                      if (id &lt; 0) {
                          CommonFunctions.display(MainDB.this, "unsucessful");
  
                      }else{
                          CommonFunctions.display(MainDB.this, "sucessful");
                      }
  
                  }
              });
  
  
          }
      }
  </code></pre>
  
  <p>DataBaseHandler Class</p>
  
  <pre><code>package com.example.logintp;
  
  import android.content.ContentValues;
  import android.content.Context;
  import android.database.Cursor;
  import android.database.sqlite.SQLiteDatabase;
  import android.database.sqlite.SQLiteOpenHelper;
  
  public class DbClass extends SQLiteOpenHelper {
  
  private static final String db_name="LoginDetails";
  private static final String table_name="Login";
  private static final String name="name";
  private static final String password="password";
  private static final int db_version=1;
  private static final String Create_Table=" CREATE TABLE " + table_name + "(" +name + " VARCHAR(200)," +password+ " VARCHAR(200)" + " ) ";
  
  
      public DbClass(Context context){
          super(context, db_name, null, db_version);
      }
      public void onCreate(SQLiteDatabase db) {
          // TODO Auto-generated method stub
          db.execSQL(Create_Table);
  
      }
  
      @Override
      public void onUpgrade(SQLiteDatabase arg0, int arg1, int arg2) {
          // TODO Auto-generated method stub
  
      }
  
  public long insertData(Login l){
  
      SQLiteDatabase db=getWritableDatabase();
      ContentValues cv=new ContentValues();
      cv.put(name, l.getName());
      cv.put(password, l.getPassword());
      long id=db.insert(table_name, null, cv);
      db.close();
      return id;
  }
  
  public String showAll(){
      String[] coloums= {name , password};
      StringBuffer b=new StringBuffer();
      SQLiteDatabase db=getWritableDatabase();
      Cursor cursor=db.query(table_name, coloums, null, null, null, null, null);
  
      while(cursor.moveToNext()){
          //Login login=new Login();
          String name1=cursor.getString(0);
          String password1=cursor.getString(1);
          b.append(name1+" "+password1+ "/n");
      }
  
      return b.toString();
  }
  }
  </code></pre>
  
  <p>i have created a simple app to learn sqlite in android.
  But when i click on the showdata button i get null values</p>