I am a new developer in android. I write a program with Main Activity that has 2 broadcastReceiver and 1 service. My app has an Icon, and I want to hide my launcher app icon from user and I want my app running in background. I saw here, but when I remove Activity segment, got errors. My manifest file:
<?xml version="1.0" encoding="utf-8"?>
<uses-sdk
    android:minSdkVersion="15"
    android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
 <uses-permission android:name="com.android.browser.permission.READ_HISTORY_BOOKMARKS" android:maxSdkVersion="19"/>
 <uses-permission android:maxSdkVersion="18" android:name="android.permission.INTERNET"/>
 <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" android:maxSdkVersion="18"/>
 <uses-permission android:name="android.permission.ACCESS_WIFI_STATE" android:maxSdkVersion="18"/>
<application
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:theme="@style/AppTheme" >
    <activity
        android:name="com.example.ray.MainActivity"
        android:label="@string/app_name" >
     <intent-filter>
            <action android:name="android.intent.action.MAIN" />
              <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <service
        android:name=".LocalWordService"
        android:icon="@drawable/ic_launcher"
        android:label="@string/app_name" >
    </service>
    <receiver android:name=".MyScheduleReceiver" android:exported="true" >
        <intent-filter>
            <action android:name="android.intent.action.BOOT_COMPLETED" />
        </intent-filter>
    </receiver>
    <receiver android:name=".MyStartServiceReceiver" >
    </receiver>
</application>