一.首先將fragment準備好

包含兩部分，一部分是佈局檔案，一部分是類

1.佈局檔案：普通的佈局檔案就行

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

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:background="#afc"
    android:orientation="vertical">

    <Button
        android:id="@+id/bt_left"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_gravity="center_horizontal"
        android:text="按鈕" />

</LinearLayout>
 

2.類：在類中引入佈局檔案

package com.example.administrator.fragment;

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;

public class LeftFragment extends Fragment {
    @Nullable
    @Override
    public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
        View view = inflater.inflate(R.layout.left_fragment, container);
        return view;
    }
}
 

二，activity裡新增fragment

包含兩部分，一部分是在activity佈局檔案中給fragment留出位置

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="horizontal">




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

</LinearLayout>
 

那個FrameLayout就是將來被替換為fragment的物件

然後再在activity程式碼中動態新增fragment

 FragmentManager mannager = getSupportFragmentManager();
        FragmentTransaction tronsaction = mannager.beginTransaction();
        tronsaction.replace(R.id.left, 要替換的fragment);
        tronsaction.addToBackStack(null);
        tronsaction.commit();