import androidx.fragment.app.FragmentActivity;
import android.os.Bundle;
import android.util.Log;
public class MainActivity extends FragmentActivity {
  public MainActivity() {
    Log.e("TAG", "MainActivity()..");
  }
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    Log.e("TAG", "MainActivity onCreate()..");
    super.onCreate(savedInstanceState);
    setContentView(R.layout.activity_main);
  }
}

import android.graphics.Color;
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 MyFragment extends Fragment {
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
               Bundle savedInstanceState) {
    //加載布局得到View對(duì)象并返回
    //創(chuàng)建一個(gè)視圖對(duì)象, 設(shè)置數(shù)據(jù)并返回
    TextView textView = new TextView(getActivity());
    textView.setText("這是第一個(gè)碎片");
    textView.setBackgroundColor(Color.RED);
    return textView;
  }
}

import android.graphics.Color;
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 MyFragment2 extends Fragment {
  @Override
  public View onCreateView(LayoutInflater inflater, ViewGroup container,
               Bundle savedInstanceState) {
    //加載布局得到View對(duì)象并返回
    //創(chuàng)建一個(gè)視圖對(duì)象, 設(shè)置數(shù)據(jù)并返回
    TextView textView = new TextView(getActivity());
    textView.setText("這是第二個(gè)碎片");
    textView.setBackgroundColor(Color.RED);
    return textView;
  }
}

<?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="horizontal"
  tools:context=".MainActivity">
  <fragment
    android:name="com.example.fragment.MyFragment"
    android:id="@+id/myfragment_1"
    android:layout_weight="1"
    android:layout_width="0dp"
    android:layout_height="match_parent"
    />
  <fragment
    android:name="com.example.fragment.MyFragment2"
    android:id="@+id/myfragment_2"
    android:layout_weight="1"
    android:layout_width="0dp"
    android:layout_height="match_parent"

    />
</LinearLayout>