Android dynamically add pieces

We can write a dynamic replacement buttons used APP fragments, the first fragment is first displayed on the home page, click on the button to the second fragment can be replaced, or deleted already replaced a second debris.

A .MainActivity.java

import androidx.fragment.app.FragmentActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;

import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;

public class MainActivity extends FragmentActivity {

    public MainActivity() {
        Log.e("TAG", "MainActivity()..");
    }

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        Log.e("The TAG", "the MainActivity onCreate () .." );
         Super .onCreate (savedInstanceState); 
        the setContentView (R.layout.activity_main); // override onCreate () method 


        // Create Object Fragment 
        Final MyFragment1 fragment1 = new new MyFragment1 ( );
         // get FragmentManager 
        FragmentManager Manager = getSupportFragmentManager ();
         // get FragmentTransacation 
        FragmentTransaction Transaction = manager.beginTransaction ();
         // add object and submit Fragment 
        transaction.add (R.id.ll_main, fragment1) .commit ( ); 

        Button1 the Button =(Button)findViewById(R.id.fragment_1);
        button1.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                showFragment2();
            }
        });
        Button button2=(Button)findViewById(R.id.fragment_2);
        button2.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View view) {
                deleteFragment2();
            }
        });

    }
    private MyFragment2 fragment2;
    public  void showFragment2 () {
         // create objects Fragment 
        fragment2 = new new MyFragment2 ();
         // get FragmentManager 
        FragmentManager Manager = getSupportFragmentManager ();
         // get FragmentTransacation 
        FragmentTransaction Transaction = manager.beginTransaction (); 

        // current operation added to the back unstack, back to back so that clicking on a state 
        transaction.addToBackStack ( null ); 

        // replace Fragment object and submit 
        transaction.replace (R.id.ll_main, fragment2) .commit (); 
    } 
    public  void deleteFragment2 () { 

        / /Obtained FragmentManager 
        FragmentManager Manager = getSupportFragmentManager ();
         // get FragmentTransacation 
        FragmentTransaction Transaction = manager.beginTransaction ();
         // remove Fragment object and submit 
        transaction.remove (fragment2) .commit (); 
    } 
}

二.activity_main.xml

<?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=".MainActivity">
    <LinearLayout
        android:orientation="horizontal"
        android:layout_width="match_parent"
        android:layout_height="wrap_content">
<Button

    android:id="@+id/fragment_1"
    android:text="切换至第二个碎片"
    android:layout_width="0dp"
    android:layout_weight="1"
    android:layout_height="wrap_content" />
    <Button
        android:id="@+id/fragment_2"
        android:text="删除第二个碎片"
        android:layout_width="0dp"
        android:layout_weight="1"
        android:layout_height="wrap_content" />
    </LinearLayout>
<LinearLayout
    android:id="@+id/ll_main"
    android:orientation="horizontal"
    android:layout_width="match_parent"
    android:layout_height="match_parent">


</LinearLayout>
</LinearLayout>

Good interface prepared as shown below:

 

 

Three .MyFragment1.java

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;


public class MyFragment1 extends Fragment {



    public MyFragment1() {
        // Required empty public constructor
    }



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

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_my_fragment1, container,false);
    }


}

Four .MyFragment2.java

import android.os.Bundle;

import androidx.fragment.app.Fragment;

import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;



public class MyFragment2 extends Fragment {
    public MyFragment2() {
        // Required empty public constructor
    }



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

    }

    @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {
        // Inflate the layout for this fragment
        return inflater.inflate(R.layout.fragment_my_fragment2, container,false);
    }

}

Five .fragment1.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
    tools:context=".MyFragment1">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text the FrameLayout<//>= "This is the first fragment" 

>

Six .fragment2.xml

<?xml version="1.0" encoding="utf-8"?>
<FrameLayout 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"
    tools:context=".MyFragment2">

    <!-- TODO: Update blank fragment layout -->
    <TextView
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:text the FrameLayout<//>= "This is a second fragment" 

>

Complete