效果图如下:

项目结构图如下:

Fragment1:

package com.demo.dongtaifragment;import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;public class Fragment2 extends Fragment {//显示faragemnt1 自己要显示的内容@Nullable@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {View view = inflater.inflate(R.layout.fragemnt2, null);return view;}
}

Fragment2:

package com.demo.dongtaifragment;import android.app.Fragment;
import android.os.Bundle;
import android.support.annotation.NonNull;
import android.support.annotation.Nullable;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;public class Fragment2 extends Fragment {//显示faragemnt1 自己要显示的内容@Nullable@Overridepublic View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {View view = inflater.inflate(R.layout.fragemnt2, null);return view;}
}

MainActivity:

package com.demo.dongtaifragment;import android.app.FragmentManager;
import android.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.WindowManager;public class MainActivity extends AppCompatActivity {@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);//[1]获取手机的分辨率WindowManager wm = (WindowManager) getSystemService(WINDOW_SERVICE);int width = wm.getDefaultDisplay().getWidth();int height = wm.getDefaultDisplay().getHeight();FragmentManager fragmentManager  = getFragmentManager();//开启事务FragmentTransaction beginTransaction = fragmentManager.beginTransaction();Fragment1 fragment1 = new Fragment1();//判断横竖if(height>width){//说明是竖屏  加载一个fragmentbeginTransaction.replace(android.R.id.content, new Fragment1());}else{//说明是横屏beginTransaction.replace(android.R.id.content, new Fragment2());}//最后一步 记得commitbeginTransaction.commit();}
}

fragemnt1.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:layout_width="wrap_content"android:layout_height="match_parent"android:text="我是fragment1竖屏的内容"android:textSize="20sp"/></android.support.constraint.ConstraintLayout>

fragemnt2.xml:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayoutxmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"android:layout_height="match_parent"><TextViewandroid:layout_width="wrap_content"android:layout_height="match_parent"android:text="我是fragment2横屏的内容"android:textSize="30sp"/></android.support.constraint.ConstraintLayout>