Android : To get rid of Icon in action bar/android

There are probably a dozen questions to this, still I cannot find an answer:

I have an app with several activities, each of which displays a standard action bar (should be so) with an android logo on the left. Now how to get rid of that logo?

This is my Manifest xml, I think the work should be done there - have tried some as you can see, but to no avail.

        <?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.pris"
        android:versionCode="1"
        android:versionName="1.0" >

        <uses-sdk
        android:minSdkVersion="13"
        android:targetSdkVersion="19" />
        android:name="android.permission.READ_EXTERNAL_STORAGE"
        android:maxSdkVersion="19" />

    <application
        android:allowBackup="true"
        android:label="@string/pris"
        android:theme="@style/AppTheme"
        android:icon="@android:color/transparent">
        <activity
            android:name="com.example.pris.MainActivity"
            android:label="@string/pris" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
            </intent-filter>
        </activity>
        <activity
            android:name="com.example.pris.ViewActivity"
            android:label="@string/pris"
            android:parentActivityName="com.example.pris.MainActivity" />
        <activity
            android:name="com.example.pris.DetailActivity"
            android:label="Priscus"
            android:parentActivityName="com.example.pris.ViewActivity" >
        </activity>

    </application>

</manifest>