Material Design support below Lollipop - crashes

问题:

I've been trying to implement the Material Design theme, following these instructions.

• I'm not using ToolBar (must I?)
• ALL my Activities extends ActionBarActivity.
• Using getSupportActionBar() all across the project.
• I'm compiling and targeting to API 21 in gradle (minimun is API 15).
• My <application> tag contains android:theme="@style/AppTheme"
• Running the application on Lollipop device (with a specific v21 similar theme works).

My styles.xml:

<style name="AppBaseTheme" parent="@style/Theme.AppCompat">
    <item name="actionBarStyle">@style/MyActionBar</item>
</style>

<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
    <!-- All customizations that are NOT specific to a particular API-level can go here. -->

</style>

<style name="MyActionBar" parent="@style/Widget.AppCompat.ActionBar.Solid">
     <item name="displayOptions">useLogo|showHome</item>
    <item name="logo">@drawable/home_page_logo</item>
    <item name="background">@color/actionbar_background_color</item>
    <item name="textColor">@color/white</item>
    <item name="titleTextStyle">@style/MyActionBarTextStyle</item>
</style>

No matter what I tried, the application crashes the second I launch my main activity on onCreate() with this crash log:

Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:151)
 at android.support.v7.app.ActionBarActivityDelegateBase.onCreate(ActionBarActivityDelegateBase.java:138)
 at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:123)

Did anyone experience this issue? any suggestions on what might cause this?

Edit: It's definitely something in my styles.xml theme. If I force the app to use the default Theme.AppCompat theme, it works. What might cause a theme to fail? I verified the ActionBar attributes are not using "android:". Anything else?

回答1:

SOLVED...

2 of my jar libs apparently have generated values.xml that contains styles of both AppTheme and AppBaseTheme. I verified only our dependencies modules, as jar libraries shouldn't declare application themes, specially not with the name of the default ones.

Before posting the answer, I added to my AndroidManifest.xml <application> tools:replace="android:theme" and declared the new theme, assuming it'll work and my application will override any other theme.

The solution eventually, stupid as it is, was to rename my own AppTheme and AppBaseTheme to different names and now it works. Hours spent on such a trivial fix. Hopefully, this will spare some time for others.

回答2:

parent should be Theme.AppCompat not @style/Theme.AppCompat.

Using @style/ you'll be using the style from the Android API 21, and it must be the style from the AppCompat library.

edit:

probably same thing for the Widget.AppCompat

edit2:

like this

<style name="AppBaseTheme" parent="Theme.AppCompat">
    <item name="actionBarStyle">@style/MyActionBar</item>
</style>

<!-- Application theme. -->
<style name="AppTheme" parent="AppBaseTheme">
    <!-- All customizations that are NOT specific to a particular API-level can go here. -->

</style>

<style name="MyActionBar" parent="Widget.AppCompat.ActionBar.Solid">
     <item name="displayOptions">useLogo|showHome</item>
    <item name="logo">@drawable/home_page_logo</item>
    <item name="background">@color/actionbar_background_color</item>
    <item name="textColor">@color/white</item>
    <item name="titleTextStyle">@style/MyActionBarTextStyle</item>
</style>

回答3:

Try remove the "@style/" from the first line in the styles.xml so you have:

<style name="AppBaseTheme" parent="Theme.AppCompat">