Android if my launcher has not started and pressing home button

Question

I've developed a launcher. In my device, there are 3 launcher with my application and the default launcher of Android. If I have not launched my application before, when I press home, my application appears on the launcher list. So, when I touch my launcher, it occurs error because of I didn't start it before. What can I do to solve this problem?

My manifest file:

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

<uses-sdk
    android:minSdkVersion="8"
    android:targetSdkVersion="17" />

<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.comeks.deneme.Main"
        android:label="@string/app_name"
        android:screenOrientation="landscape"
        android:excludeFromRecents="true" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:label="@string/app_name"
        android:name=".main.java"
        android:excludeFromRecents="true" >
        <intent-filter >
            <action android:name="android.intent.action.MAIN" />
            <category android:name="android.intent.category.HOME" />
            <category android:name="android.intent.category.DEFAULT" />
        </intent-filter>
    </activity>
</application>

</manifest>

Answer 1

What is the name of the file of your second activity? main.java.java?

Do you even have two different activities?