<style name="DayTheme" parent="AppTheme">
        <item name="color_title">@color/title_bai</item>
        <item name="color_background">@drawable/bg01</item>
    </style>

    <style name="NightTheme" parent="AppTheme">
        <item name="color_title">@color/title_ye</item>
        <item name="color_background">@drawable/bg02</item>
    </style>

    <style name="FragmentTheme1" parent="AppTheme">
        <item name="fragmentcolor_title">@color/fragment_textcolor1</item>
    </style>

    <color name="title_bai">#000000</color>
    <color name="title_ye">#ffffff</color>
    <color name="background_bai">#ffffff</color>
    <color name="background_ye">#8e7d7d</color>
    <color name="fragment_textcolor1">#D43333</color>
    <color name="fragment_textcolor2">#71C41F</color>

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

   
        <attr name="color_title" format="color" />
        <attr name="color_background" format="color" />
        <attr name="fragmentcolor_title" format="color" />

</resources>

<?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"
    android:background="?attr/color_background"
    tools:context="com.example.guoxw.myapplication.MainActivity"
    android:weightSum="1">

    <LinearLayout
        android:layout_width="match_parent"
        android:layout_height="40dp"
        android:orientation="horizontal">

        <Button
            android:id="@+id/btn1"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:layout_height="match_parent"
            android:textColor="?attr/color_title"
            android:text="fragment1"/>
        <Button
            android:id="@+id/btn2"
            android:layout_width="0dp"
            android:layout_weight="1"
            android:textColor="?attr/color_title"
            android:layout_height="match_parent"
            android:text="fragment2"/>
        <Button
            android:id="@+id/btn3"
            android:layout_width="0dp"
　　　　　　　android:textColor="?attr/color_title"
            android:layout_weight="1"
            android:layout_height="match_parent"
            android:text="activity2"/>
        <Button
            android:id="@+id/btn4"
            android:layout_width="0dp"
            android:textColor="?attr/color_title"
            android:layout_weight="1"
            android:layout_height="match_parent"
            android:text="切换"/>
    </LinearLayout>

    <FrameLayout
        android:id="@+id/fragmentlayout"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:layout_marginBottom="?actionBarSize"
        android:layout_marginTop="?actionBarSize" />

     
</LinearLayout>

  protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        if (Constant.isDay) {
            this.setTheme(R.style.DayTheme);
        } else {
            this.setTheme(R.style.NightTheme);
        }
        setContentView(R.layout.activity_main);
}

 @Override
    public View onCreateView(LayoutInflater inflater, ViewGroup container,
                             Bundle savedInstanceState) {

        Context ctxWithTheme = new ContextThemeWrapper(getActivity().getApplicationContext(),R.style.FragmentTheme1);
        LayoutInflater localLayoutInflater = inflater.cloneInContext(ctxWithTheme);
        ViewGroup rootView = (ViewGroup)localLayoutInflater.inflate(R.layout.fragment_fragment1, null, false);

        //view=inflater.inflate(R.layout.fragment_fragment1, container, false);

        return rootView;
    }

http://pan.baidu.com/s/1eSiU42Q