Android动态添加Fragment

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:

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
 xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
 android:layout_height="match_parent">
 <TextView
 android: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.ConstraintLayout
 xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
 android:layout_height="match_parent">
 <TextView
 android: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>

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