Unable To Start Activity Componentinfo You Need To Use A Theme.appcompat Theme With This Activity.

why my unable to start my manactivity so please find the solution in my programm errors are coming in the program are java.lang.RuntimeException: Unable to start activity Comp

Solution 1:

1- You should delete style.xml in values-v21 folder 2- your style.xml in values folder

<?xml version="1.0" encoding="utf-8"?><resources><!--
        Base application theme for API 14+. This theme completely replaces
        AppBaseTheme from BOTH res/values/styles.xml and
        res/values-v11/styles.xml on API 14+ devices.
    --><stylename="AppBaseTheme"parent="Theme.AppCompat.Light.DarkActionBar"><!-- API 14 theme customizations can go here. --><itemname="colorPrimary">#ff0000</item></style></resources>

and AndroidManifest.xml

<application
        android:allowBackup="true"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name"
        android:theme="@style/AppBaseTheme" >
    </application>

good luck :)

Solution 2:

If you are extending ActionBarActivity in your MainActivity, you will have to change the parent theme in values-v11 also. So the style.xml in values-v11 will be -

<!-- res/values-v11/themes.xml --><?xml version="1.0" encoding="utf-8"?><resources><stylename="QueryTheme"parent="@style/Theme.AppCompat"><!-- Any customizations for your app running on devices with Theme.Holo here --></style>

ActionBarCompat Problem