<?xml version="1.0" encoding="utf-8"?>

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"

    android:orientation="horizontal"

    android:layout_width="match_parent"

    android:layout_height="match_parent">

    <fragment android:name="com.itheima.fragment.Fragment1"

            android:id="@+id/list"

            android:layout_weight="1"

            android:layout_width="0dp"

            android:layout_height="match_parent" />

    <fragment android:name="com.itheima.fragment.Fragment2"

            android:id="@+id/viewer"

            android:layout_weight="1"

            android:layout_width="0dp"

            android:layout_height="match_parent" />

</LinearLayout>

import android.app.Fragment;

import android.os.Bundle;

import android.view.LayoutInflater;

import android.view.View;

import android.view.ViewGroup;

//定义一个Fragment

public class Fragment1 extends Fragment {

    //当用户第一次画ui的时候调用  要显示Fragment自己的内容  setContentView(R.layout.activity_main);

    @Override

    public View onCreateView(LayoutInflater inflater, ViewGroup container,

            Bundle savedInstanceState) {

        //[1]通过打气筒把一个布局转换成view对象

        View view = inflater.inflate(R.layout.fragment1, null);

        return view;

    }

}