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

@Override

public 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

@Override

public 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 {

@Override

protected 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fragment

beginTransaction.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commit

beginTransaction.commit();

}

}

fragemnt1.xml:

xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"

android:layout_height="match_parent">

android:layout_width="wrap_content"

android:layout_height="match_parent"

android:text="我是fragment1竖屏的内容"

android:textSize="20sp"

/>

fragemnt2.xml:

xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"

android:layout_height="match_parent">

android:layout_width="wrap_content"

android:layout_height="match_parent"

android:text="我是fragment2横屏的内容"

android:textSize="30sp"

/>