<?xml version="1.0" encoding="utf-8"?> 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:orientation="vertical" > 
  
  <TextView 
   android:id="@+id/textView" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:text="@string/testview" /> 
  
  <Button 
   android:id="@+id/button" 
   android:layout_width="wrap_content" 
   android:layout_height="wrap_content" 
   android:text="@string/button" /> 
  
 </LinearLayout> 

 <?xml version="1.0" encoding="utf-8"?> 
 <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
  android:layout_width="match_parent" 
  android:layout_height="match_parent" 
  android:baselineAligned="false" 
  android:orientation="horizontal" > 
  
  <fragment 
   android:id="@+id/first" 
   android:name="com.example.FristFragment" 
   android:layout_width="0dp" 
   android:layout_height="match_parent" 
   android:layout_weight="1" /> 
  
  <fragment 
   android:id="@+id/second" 
   android:name="com.example.SecondFragment" 
   android:layout_width="0dp" 
   android:layout_height="match_parent" 
   android:layout_weight="1" /> 
  
 </LinearLayout> 

 FragmentManager fragmentManager = getFragmentManager() 
 FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction(); 
 ExampleFragment fragment = new ExampleFragment(); 
 fragmentTransaction.add(R.id.fragment_container, fragment); 
 fragmentTransaction.commit(); 

 import android.os.Bundle; 
 import android.support.v4.app.Fragment; 
  
 public class TestFragment extends Fragment { 
  public static TestFragment newInstance(int num, String title) { 
   TestFragment fragment = new TestFragment(); 
   Bundle args = new Bundle(); 
   args.putInt("num", num); 
   args.putString("title", title); 
   fragment.setArguments(args); 
   return fragment; 
  } 
  
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
   super.onCreate(savedInstanceState); 
  
   int num = getArguments().getInt("num", 0); 
   String title = getArguments().getString("title", ""); 
  } 
  
 } 

 FragmentTransaction ft = getSupportFragmentManager().beginTransaction(); 
 TestFragment fragment = TestFragment.newInstance(5, "fragment title"); 
 ft.replace(R.id.placeholder, fragment); 
 ft.commit(); 

 public class TestFragment extends Fragment { 
  public void doSomething(String param) { 
   // do something in fragment 
  } 
 } 

 public class MainActivity extends FragmentActivity { 
  @Override 
  public void onCreate(Bundle savedInstanceState) { 
   super.onCreate(savedInstanceState); 
   TestFragment testFragment = new TestFragment(); 
   testFragment.doSomething("some param"); 
  } 
 } 

import android.support.v4.app.Fragment; 
  
 public class MyListFragment extends Fragment { 
  // ... 
  // Define the listener of the interface type 
  // listener is the activity itself 
  private OnItemSelectedListener listener; 
  
  // Define the events that the fragment will use to communicate 
  public interface OnItemSelectedListener { 
  public void onRssItemSelected(String link); 
  } 
  
  // Store the listener (activity) that will have events fired once the fragment is attached 
  @Override 
  public void onAttach(Activity activity) { 
  super.onAttach(activity); 
   if (activity instanceof OnItemSelectedListener) { 
   listener = (OnItemSelectedListener) activity; 
   } else { 
   throw new ClassCastException(activity.toString() 
    + " must implement MyListFragment.OnItemSelectedListener"); 
   } 
  } 
  
  // Now we can fire the event when the user selects something in the fragment 
  public void onSomeClick(View v) { 
   listener.onRssItemSelected("some link"); 
  } 
 } 

import android.support.v4.app.FragmentActivity; 
  
 public class RssfeedActivity extends FragmentActivity implements 
  MyListFragment.OnItemSelectedListener { 
  DetailFragment fragment; 
  
  @Override 
  protected void onCreate(Bundle savedInstanceState) { 
   super.onCreate(savedInstanceState); 
   setContentView(R.layout.activity_rssfeed); 
   fragment = (DetailFragment) getSupportFragmentManager() 
    .findFragmentById(R.id.detailFragment); 
  } 
  
  // Now we can define the action to take in the activity when the fragment event fires 
  @Override 
  public void onRssItemSelected(String link) { 
   if (fragment != null && fragment.isInLayout()) { 
    fragment.setText(link); 
   } 
  } 
 }