示例图：

创建 Fragment  new -> Fragment -> Fragment（Blank）

MainActivity.java

package com.example.fragmentdemo;import androidx.appcompat.app.AppCompatActivity;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;import android.os.Bundle;
import android.widget.LinearLayout;
import android.widget.TextView;public class MainActivity extends AppCompatActivity {private TextView textView;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);textView = findViewById(R.id.tv_get_result);TwoFragment twoFragment = new TwoFragment();//数据传递Bundle bundle = new Bundle();bundle.putString("name","张三丰");twoFragment.setArguments(bundle);//接收TwoFragment 传递过来的参数twoFragment.setPassingData(new TwoFragment.Myinterface() {@Overridepublic void getResult(String data) {textView.setText(data);}});//动态添加FragmentFragmentManager fragmentManager = getSupportFragmentManager();FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();// 通过id , 把 twoFragment 添加到LinearLayout布局中fragmentTransaction.add(R.id.linear_layout,twoFragment);// 替换
//        fragmentTransaction.replace(R.id.linear_layout,twoFragment);//删除
//        fragmentTransaction.remove(twoFragment);// 添加到回退栈  点击返时重新创建fragment  fragmentTransaction.addToBackStack(null);//提交fragmentTransaction.commit();}
}

HomeFragment.java

package com.example.fragmentdemo;import android.os.Bundle;import androidx.fragment.app.Fragment;import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;public class HomeFragment extends Fragment {@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// Inflate the layout for this fragmentreturn inflater.inflate(R.layout.fragment_home, container, false);}
}

TwoFragment.java

package com.example.fragmentdemo;import android.os.Bundle;import androidx.fragment.app.Fragment;import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;public class TwoFragment extends Fragment {private TextView textView;@Overridepublic View onCreateView(LayoutInflater inflater, ViewGroup container,Bundle savedInstanceState) {// Inflate the layout for this fragmentView view = inflater.inflate(R.layout.fragment_two, container, false);//获取数据String name = getArguments().getString("name");textView = view.findViewById(R.id.tv_get_data);textView.setText(name);return view;}// 给主页面传递参数public void setPassingData(Myinterface myinterface){String name = "周芷若";myinterface.getResult(name);}//定义一个接口public interface Myinterface{void getResult(String data);}
}

主布局 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"><TextViewandroid:textSize="24sp"android:layout_width="wrap_content"android:layout_height="wrap_content"android:text="Fragment 简单应用"/><TextViewandroid:id="@+id/tv_get_result"android:textSize="24sp"android:textColor="#ff00ff00"android:layout_width="match_parent"android:layout_height="wrap_content"/><!-- 注意：要加idandroid:name 引入java类--><fragmentandroid:id="@+id/fragment_test"android:name="com.example.fragmentdemo.HomeFragment"android:layout_width="match_parent"android:layout_height="300dp"/><LinearLayoutandroid:id="@+id/linear_layout"android:layout_width="match_parent"android:layout_height="300dp"android:orientation="horizontal" />
</LinearLayout>

fragment_home.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:background="#00BCD4"android:layout_width="match_parent"android:layout_height="match_parent"tools:context=".HomeFragment"><!-- TODO: Update blank fragment layout --><TextViewandroid:textSize="24sp"android:layout_width="match_parent"android:layout_height="match_parent"android:text="@string/hello_blank_fragment" /></FrameLayout>

fragment_two.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout 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"android:orientation="vertical"android:background="#ff00ff"tools:context=".TwoFragment"><!-- TODO: Update blank fragment layout --><TextViewandroid:textSize="24sp"android:layout_width="match_parent"android:layout_height="wrap_content"android:text="@string/hello_blank_fragment_two" /><TextViewandroid:text="获取到的数据是："android:textSize="24sp"android:layout_width="match_parent"android:layout_height="wrap_content"/><TextViewandroid:id="@+id/tv_get_data"android:textSize="24sp"android:layout_width="match_parent"android:layout_height="wrap_content"/></LinearLayout>