Xml components are not loaded into Activity

Question

Editing:

I just found out that if I comment on the lines that cause the error, it gets all black screen... IE, does not load the layout.

I’m trying to get a Progressbar and a Textview so I can make changes according to an Asynctask. It is worth mentioning that at the time the project was created, the main Activity is not this, this (named Splashscreen) was created later (I’m saying this because I’m a beginner and I have no knowledge if something can affect, if I left something behind).

protected void onCreate(Bundle icicle) {
    super.onCreate(icicle);
    setContentView(R.layout.splash_screen);

    /* New Handler to start the Menu-Activity
     * and close this Splash-Screen after some seconds.*/

    mProgressBar = (ProgressBar) this.findViewById(R.id.progressBar);
    mProgressText = (TextView) this.findViewById(R.id.progressBarTextView);

    try {
        new WSCatalogo91(this).execute();
    } catch (SQLException e) {
        e.printStackTrace();
    }
}

the return of the lines where they make the findViewById is null always.

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent"
    android:layout_height="match_parent" android:paddingLeft="@dimen/activity_horizontal_margin"
    android:paddingRight="@dimen/activity_horizontal_margin"
    android:paddingTop="@dimen/activity_vertical_margin"
    android:paddingBottom="@dimen/activity_vertical_margin"
    tools:context=".SplashScreen">

    <ImageView
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/logoSplashScreen"
        android:layout_centerVertical="true"
        android:layout_centerHorizontal="true" />

    <TextView android:text="@string/progressBar" android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_centerHorizontal="true"
        android:layout_centerVertical="true"
        android:id="@+id/progressBarTextView"
        android:maxWidth="400dp"
        android:maxHeight="400dp"/>

    <ProgressBar
        style="?android:attr/progressBarStyleHorizontal"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:id="@+id/progressBar"
        android:indeterminate="false"
        android:layout_centerHorizontal="true"
        android:layout_marginTop="165dp"
        android:minWidth="300dp" />

</RelativeLayout>

Manifest:

<activity
    android:name="com.universo91.catalogo91_android.activity.MainActivity"
    android:label="@string/app_name"
    android:screenOrientation="landscape" >
</activity>


<activity
    android:name="com.universo91.catalogo91_android.activity.SplashScreen"
    android:label="@string/title_activity_splash_screen"
    android:theme="@android:style/Theme.NoTitleBar"
    android:screenOrientation="landscape" >
    <intent-filter>
        <action android:name="android.intent.action.MAIN" />
        <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>


<activity
    android:name="com.universo91.catalogo91_android.activity.Login"
    android:label="@string/title_activity_login"
    android:screenOrientation="landscape">
</activity>