Theme not applied using appcompat library on some Android 4.X devices

问题

After updating the appcompat library to the latest version (v21) to apply the material design, my custom theme isn't used anymore on Android 4.0.X devices unless I explicitly declare it in the XML.

I have tested the theme on Android 2.3.X and 5.0.0 devices and it works on those devices. But it's not working on my HTC One S with Android 4.0.3. What do I need to do to fix this?

My themes.xml

<style name="Theme.Custom" parent="@style/Theme.AppCompat.Light">
    <item name="android:editTextStyle">@style/Custom.Widget.EditText</item>
    <item name="android:buttonStyle">@style/Custom.Widget.Button</item>
</style>

My styles.xml

<style name="Custom.Widget.EditText" parent="android:Widget.EditText">
    <item name="android:background">@drawable/edit_text_holo_light</item>
    <item name="android:textColor">@color/text_primary</item>
    <item name="android:textColorHint">@color/text_hint_color</item>
</style>

<style name="Custom.Widget.Button" parent="android:Widget.Button">
    <item name="android:background">@drawable/btn_default_holo_light</item>
    <item name="android:minHeight">48dip</item>
    <item name="android:minWidth">64dip</item>
    <item name="android:textColor">@color/button_text_primary</item>
</style>

My layout file

<?xml version="1.0" encoding="utf-8"?>
<ScrollView xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
xmlns:app="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="match_parent" >

<RelativeLayout
    android:layout_width="match_parent"
    android:layout_height="wrap_content"
    android:layout_gravity="center_horizontal" >

    <!-- other elements -->

    <RelativeLayout
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:layout_marginTop="16dp"
        android:paddingLeft="16dp"
        android:paddingRight="16dp" >

        <EditText
            android:id="@+id/view_username_edit_username_editText"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:inputType="textNoSuggestions|textCapSentences"
            android:hint="@string/UsernameScreen_usernameHint"
            android:imeOptions="actionDone"
            android:singleLine="true"
            android:maxLength="@integer/username_max_length"
            android:textSize="@dimen/text_size_medium" />

        <Button
            android:id="@+id/view_username_save_Button"
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:layout_below="@+id/view_username_edit_username_editText"
            android:clickable="true"
            android:enabled="false"
            android:orientation="horizontal"
            android:text="@string/common_save" />
    </RelativeLayout>

</RelativeLayout>

If I add the following to lines in the layout files it works. So there seems to be going something wrong with the themes.xml.

style="@style/Custom.Widget.EditText"
style="@style/Custom.Widget.Button"

Result:

Expected:

Edit

I tested the same code on some other devices.

• Samsung S2 (4.0.4): OK
• HTC One (4.4.3): OK
• HTC One X (4.0.3): NOK
• HTC One S (4.1.1): NOK
• HTC Desire C (4.0.3): NOK

I don't see why it wouldn't work on some of these devices.

回答1:

I after add buttonStyle without the "android:" prefix and it solved the problem. (name="android:buttonStyle" -> name="buttonStyle")

<style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
    <item name="buttonStyle">@style/SkinedButton</item>
</style>

回答2:

Finally I found a solution to my problem. I was using @style/Theme.AppCompat as a parent to one of my styles. After changing it to @style/Theme.AppCompat.Light.DarkActionBar it works on all devices. I still find it very strange why this would screw up my styling.

来源：https://stackoverflow.com/questions/27603189/theme-not-applied-using-appcompat-library-on-some-android-4-x-devices