Dynamic loading of Fragment

xml layout file

fragment_list.xml (controls the content in the fragment)

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent" android:layout_height="match_parent"
    android:background="#ffff00">
    <TextView
        android:id="@+id/textView"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerInParent="true"
        android:text="TextView"
        android:textColor="#000000"
        android:textSize="20sp"/>
</RelativeLayout>

Fragment's Java code management class

package com.administrator.fragmentdemo;

import android.content.Context;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;

/**
 * list fragment
 */
public class ListFragment extends Fragment {
    //create view
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        //new view
        View view = inflater.inflate(R.layout.fragment_list,container,false);
        TextView textView = view.findViewById(R.id.textView);//FindViewById needs to be performed according to the root view view
        textView.setText("hi");
        return view;
    }
    @Override
    public void onAttach(Context context) {
        super.onAttach(context);
    }

    @Override
    public void onCreate(@Nullable Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
    }

    @Override
    public void onActivityCreated(@Nullable Bundle savedInstanceState) {
        super.onActivityCreated(savedInstanceState);
    }

    @Override
    public void onStart() {
        super.onStart();
    }

    @Override
    public void onPause() {
        super.onPause();
    }

    @Override
    public void onStop() {
        super.onStop();
    }

    @Override
    public void onDestroyView() {
        super.onDestroyView ();
    }

    @Override
    public void onDestroy() {
        super.onDestroy ();
    }
}

Set the displayable area for the fragment in the container activity_main.xml

Set up the two containers listContainer and detailContainer respectively

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    tools:context="com.administrator.fragmentdemo.MainActivity">

   <LinearLayout
       android:orientation="horizontal"
       android:layout_width="match_parent"
       android:layout_height="match_parent">
      <LinearLayout
          android:id="@+id/listContainer"
          android:layout_width="150dp"
          android:layout_margin="1dp"
          android:layout_height="match_parent">
      </LinearLayout>
      <LinearLayout
          android:id="@+id/detailContainer"
          android:layout_width="200dp"
          android:layout_margin="1dp"
          android:layout_height="match_parent">
      </LinearLayout>
   </LinearLayout>

</LinearLayout>

The Java code of the Activity that loads the Fragment

package com.administrator.fragmentdemo;

import android.content.Context;
import android.content.Intent;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;

public class MainActivity extends AppCompatActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate (savedInstanceState);
        setContentView(R.layout.activity_main);

        //1.container container 2.fragment 3.fragment-->container put the fragment into the container container
        //getSupportFragmentManager() gets a fragment container, beginTransaction() opens a thing, and add() puts the fragment in (associated with it). commit() submit to the system
        //R.id.listContainer, listContainer is the container id just set, and add associates the container with the fragment
        ListFragment fragment = new ListFragment ();
        getSupportFragmentManager()
                .beginTransaction()
                .add(R.id.listContainer,fragment)
                .commit();
        getSupportFragmentManager()
                .beginTransaction()
                .add(R.id.detailContainer,new ListFragment())
                .commit();
        //new ListFragment() create a new fragment

// // remove the fragment
//        getSupportFragmentManager()
//                .beginTransaction()
//                .remove(fragment)
//                .commit();

// //replace fragment
//        getSupportFragmentManager()
//                .beginTransaction()
//                .replace(R.id.listContainer,new ListFragment())
//                .commit();
    }

}