Actionbar wont change color for Theme.AppCompat.Light

Question

AndroidManifest.xml

<application
        android:allowBackup="true"
        android:icon="@mipmap/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/Theme.AppCompat" >
        <activity
            android:name=".MainActivity"
            android:label="@string/cb_campaign"
            android:logo="@mipmap/ic_launcher"
            android:theme="@style/MyTheme">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

styles.xml

 <resources>
        <style name="MyTheme" parent="@android:style/Theme.AppCompat.Light">
            <item name="android:actionBarStyle">@style/MyActionBar</item>
        </style>

        <style name="MyActionBar" parent="@style/Widget.AppCompat.Light.ActionBar">
            <item name="android:background">#FFCA09</item>
        </style>
    </resources>

MainActivity.java

public class MainActivity extends AppCompatActivity{
}

Edit: Original question was: How to solve Android error: java.lang.IllegalStateException:You need to use a Theme.AppCompat

Changed AndroidManifest.xml

 <style name="MyTheme" parent="@style/Theme.AppCompat.Light">

But action background color still won't change.

Answer 1

Just switch on the Design view, then click on AppTheme button and just change theme.

that's all.

Answer 2

你可以从这里学到一些材料设计cheesesquare

Answer 3

You need to omit the "android:" to use backwards-compatible attributes:

<resources>
    <style name="AppTheme" parent="Theme.AppCompat.Light.DarkActionBar">
        <item name="android:actionBarStyle">@style/MyActionBar</item>
        <!--Backwards compatibility-->
        <item name="actionBarStyle">@style/MyActionBar</item>
    </style>

    <style name="MyActionBar" parent="Widget.AppCompat.Light.ActionBar">
        <item name="android:background">@color/red</item>
        <!--Backwards compatibility-->
        <item name="background">@color/red</item>
    </style>
    <color name="red">#FF0000</color>
</resources>

Answer 4

A reference to a style resource defining a default theme for all activities in the application. Individual activities can override the default by setting their own theme attributes. For more information, see the Styles and Themes developer guide.

<application
    android:allowBackup="true"
    android:icon="@mipmap/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/Theme.AppCompat">
    <activity
        android:name=".MainActivity"
        android:label="@string/cb_campaign"
        android:logo="@mipmap/ic_launcher"
        android:theme="@style/MyTheme">

android:theme="@style/Theme.AppCompat" in <application> tag u need to apply your theme. one suggestion its better to go with material design stackoverflow link