how to call a fragment from activity

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I have to call a fragment class from an activity. In the activity, i have to check the username and password before calling the fragment class. When i click the login button, fragment class has to be loaded. But, login layout is overlapped by the fragment layout. How to remove the overlapping.

login.java

public class Login extends Activity {

public void onCreate(Bundle savedInstanceState){
super.onCreate(savedInstanceState);
setContentView(R.layout.login);
}

public void evaluate(View view){

EditText editText1 = (EditText) findViewById(R.id.editText1);
EditText editText2 = (EditText) findViewById(R.id.editText2);

String username = editText1.getText().toString();
String password = editText2.getText().toString();

if (username.equals("user") && password.equals("user")){

Fragment1 fragment1 = new Fragment1();

getFragmentManager().beginTransaction()
.add(android.R.id.content, fragment1).commit();


         }        


  }
}

Fragment1.java

public class Fragment1 extends Fragment{
public View onCreateView(LayoutInflater inflater,
ViewGroup container, Bundle savedInstanceState){
return inflater.inflate(R.layout.fragment1, container,false);

} }

login.xml

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<LinearLayout android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="fill_parent">
<TextView
android:id="@+id/textView1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"        
android:text="Username" />
<EditText
android:id="@+id/editText1"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10" >

<requestFocus />
</EditText>
</LinearLayout>
<LinearLayout android:orientation="horizontal"
android:layout_width="wrap_content"
android:layout_height="fill_parent">
<TextView
android:id="@+id/textView2"
android:layout_width="wrap_content"
android:layout_height="wrap_content"        
android:text="Password" />
<EditText
android:id="@+id/editText2"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:ems="10" >

</EditText>
</LinearLayout>

<Button
android:id="@+id/login"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="evaluate"
android:text="Login" />

</LinearLayout>

fragment1.xml

<LinearLayout xmlns:android="http://ift.tt/nIICcg"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="wrap_content">

<Button
android:id="@+id/login"
android:layout_width="fill_parent"
android:layout_height="wrap_content"
android:onClick="goto"
android:text="Go to Main Activity" />

</LinearLayout>

asked 23 secs ago

user3715224

3

how to call a fragment from activity