App crashes when extending ActionBarActivity

Question

I have an error catch when I extend ActionBarActivity. If I extend Activity there is no errors.

The thing is in my other activities it works perfectly. At first, I thought it's was because my previous activity put extras in the intent. But even without it the app crash.

Here is my code :

import android.support.v7.app.ActionBarActivity;

import android.os.Bundle;

public class FullscreenActivity extends ActionBarActivity {

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_fullscreen);
    }
}

EDIT : and the result of logs :

09-21 18:21:39.413: E/AndroidRuntime(26944): FATAL EXCEPTION: main
09-21 18:21:39.413: E/AndroidRuntime(26944): java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.testlfm/com.example.testlfm.FullscreenActivity}: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2308)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.app.ActivityThread.handleLaunchActivity(ActivityThread.java:2358)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.app.ActivityThread.access$600(ActivityThread.java:153)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.app.ActivityThread$H.handleMessage(ActivityThread.java:1247)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.os.Handler.dispatchMessage(Handler.java:99)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.os.Looper.loop(Looper.java:137)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.app.ActivityThread.main(ActivityThread.java:5227)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at java.lang.reflect.Method.invokeNative(Native Method)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at java.lang.reflect.Method.invoke(Method.java:511)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:795)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:562)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at dalvik.system.NativeStart.main(Native Method)
09-21 18:21:39.413: E/AndroidRuntime(26944): Caused by: java.lang.IllegalStateException: You need to use a Theme.AppCompat theme (or descendant) with this activity.
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.support.v7.app.ActionBarActivityDelegate.onCreate(ActionBarActivityDelegate.java:102)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.support.v7.app.ActionBarActivityDelegateICS.onCreate(ActionBarActivityDelegateICS.java:58)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.support.v7.app.ActionBarActivity.onCreate(ActionBarActivity.java:98)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at com.example.testlfm.FullscreenActivity.onCreate(FullscreenActivity.java:36)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.app.Activity.performCreate(Activity.java:5104)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.app.Instrumentation.callActivityOnCreate(Instrumentation.java:1080)
09-21 18:21:39.413: E/AndroidRuntime(26944):    at android.app.ActivityThread.performLaunchActivity(ActivityThread.java:2262)
09-21 18:21:39.413: E/AndroidRuntime(26944):    ... 11 more

Answer 1

As per the error you have posted: "You need to use a Theme.AppCompat theme (or descendant) with this activity." You should be using the appcompat library as a Library Project, in which case you'll see the available themes under res/values in that project