main.xml文件

<?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:id="@+id/left_fragment"
        android:name="com.example.administrator.fragmenttest.Fragmenteft"
        android:layout_width="match_parent"
        android:layout_height="match_parent" />

    <!--<fragment-->
        <!--android:id="@+id/right_fragment"-->
        <!--android:name="com.example.administrator.fragmenttest.FragmentRight"-->
        <!--android:layout_width="0dp"-->
        <!--android:layout_height="match_parent"-->
        <!--android:layout_weight="1"/>-->

    <FrameLayout
        android:id="@+id/right_layout"
        android:layout_width="0dp"
        android:layout_height="match_parent"
        android:layout_weight="1">

    </FrameLayout>
</LinearLayout>

MainActivity.java文件

package com.example.administrator.fragmenttest;

import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentTransaction;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;

public class MainActivity extends AppCompatActivity implements View.OnClickListener {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        Button button = (Button) findViewById(R.id.button);
        button.setOnClickListener(this);//为按钮注册一个点击事件
    }

    @Override
    public void onClick(View v) {
        switch(v.getId()){
            case R.id.button :
                replaceFragment(new AnotherRightFragment());//调用 replaceFragment(方法动态添加RightFragment这个碎片)
                break;
        }
    }
//创建待添加的碎片实例
    private void replaceFragment(Fragment fragment) {
        FragmentManager fragmentManager = getSupportFragmentManager();//获取FragmentManager，在活动中可以直接调用getSupportFragmentManager()方法得到
        FragmentTransaction transaction = fragmentManager.beginTransaction();//开启一个事务，通过调用beginTransaction()方法开启
        transaction.replace(R.id.right_layout,fragment);//向容器中添加或替换碎片 replace（需要传入容器的ID，代添加的碎片实例）
        transaction.addToBackStack(null);
        transaction.commit();//提交事务
    }
}

another.xml文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:orientation="vertical" android:layout_width="match_parent"
    android:background="#ffff00"
    android:layout_height="match_parent">
    <TextView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:textSize="20sp"
        android:text="This is another right fragment"/>

</LinearLayout>

AnotherRightFragment,java文件

package com.example.administrator.fragmenttest;

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;

/**
 * Created by Administrator on 2017/3/20.
 */
public class AnotherRightFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.another_right_fragment,container,false);
        return view;
    }
}