public class MainActivity extends AppCompatActivity {    @Override    PRotected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);    }}activity_main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.zhiyuan3g.fragmenttest.MainActivity">    <fragment        android:name="com.zhiyuan3g.fragmenttest.Fragment1"        android:id="@+id/fragment1"        android:layout_width="0dp"        android:layout_height="match_parent"        android:layout_weight="1"/>    <fragment        android:name="com.zhiyuan3g.fragmenttest.Fragment2"        android:layout_width="0dp"        android:id="@+id/fragment2"        android:layout_height="match_parent"        android:layout_weight="1"/></LinearLayout>Fragment1.class（同Fragment2.class）
public class Fragment1 extends Fragment {    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        View fragment1 = inflater.inflate(R.layout.fragment1, null);        return fragment1;    }}
運行效果：
二、Fragment的動態創建的步驟：（前提：寫好自己的Fragment類，見上篇文章）1.創建Fragment的管理對象fragmentManager。FragmentManager fragmentManager = getFragmentManager();2.創建事務對象（Fragment事務對象不能抽取,因為每提交一次,就需要一個新的Fragment事務對象.(所有的事務都有這個特性)）FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();3.動態創建Fragment
fragmentTransaction.replace(android.R.id.content, new Fragment1());
4.提交事務對象
fragmentTransaction.commit();
代碼如下：MainActivity.class
/** * function:g根據橫豎屏切換不同的Fragment顯示。 */public class MainActivity extends AppCompatActivity {    @Override    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setContentView(R.layout.activity_main);        WindowManager windowManager = (WindowManager) getSystemService(WINDOW_SERVICE);        int height = windowManager.getDefaultDisplay().getHeight();        int width = windowManager.getDefaultDisplay().getWidth();        //Fragment的動態創建步驟：        //1.創建Fragment的管理對象fragmentManager        FragmentManager fragmentManager = getFragmentManager();        //2.創建事務對象        FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();        if (height > width) {            //3.動態創建Fragment            fragmentTransaction.replace(android.R.id.content, new Fragment1());        } else {            //3.動態創建Fragment            fragmentTransaction.replace(android.R.id.content, new Fragment2());        }        //4.提交事務對象        fragmentTransaction.commit();    }}activity_main.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout    xmlns:android="http://schemas.android.com/apk/res/android"    xmlns:tools="http://schemas.android.com/tools"    android:layout_width="match_parent"    android:layout_height="match_parent"    android:orientation="horizontal"    android:paddingBottom="@dimen/activity_vertical_margin"    android:paddingLeft="@dimen/activity_horizontal_margin"    android:paddingRight="@dimen/activity_horizontal_margin"    android:paddingTop="@dimen/activity_vertical_margin"    tools:context="com.zhiyuan3g.fragmenttest.MainActivity">    </LinearLayout>Fragment1.class（同Fragment2.class）
public class Fragment1 extends Fragment {    @Nullable    @Override    public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {        View fragment1 = inflater.inflate(R.layout.fragment1, null);        return fragment1;    }}fragment1.xml
<?xml version="1.0" encoding="utf-8"?><LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"              android:orientation="vertical"              android:layout_width="match_parent"              android:layout_height="match_parent"><TextView    android:layout_width="wrap_content"    android:layout_height="wrap_content"    android:text="我是fragment1"    android:textSize="25dp"/></LinearLayout>
運行效果：
豎屏時顯示
橫屏時顯示