Activitys in android

is required declarete all activities in tiap.xml? can exist more than 1 activities with category launcher? cuz im trying acces a activiy when a incoming push notificacion is received....but its not working so fine

Tiap.xml

<android xmlns:android="http://schemas.android.com/apk/res/android">
        <activities>
             <activity url="app.js"
            android:launchMode="singleTask" android:alwaysRetainTaskState="true">
                <intent-filter>
                    <action android:name="android.intent.action.VIEW"/>
                    <category android:name="android.intent.category.DEFAULT"/>
                    <category android:name="android.intent.category.BROWSABLE"/>
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </activities>
        <manifest android:installLocation="auto">
            <application  android:allowBackup="true" >
                <uses-sdk android:minSdkVersion="10" android:targetSdkVersion="16"/>
                <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
                <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
                <uses-permission android:name="android.permission.READ_PHONE_STATE"/>
                <uses-permission android:name="android.permission.INTERNET"/>
                <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
                <uses-permission android:name="android.permission.WAKE_LOCK"/>
                <uses-permission android:name="android.permission.READ_CALENDAR"/>
                <uses-permission android:name="android.permission.WRITE_CALENDAR"/>
                <uses-permission android:name="com.galgomedia.planvitalapp.permission.C2D_MESSAGE"/>
                <uses-permission android:name="com.google.android.c2dm.permission.RECEIVE"/>
                <uses-permission android:name="android.permission.GET_ACCOUNTS"/>
                <uses-permission android:name="com.foo.bar.permission.C2D_MESSAGE" android:protectionLevel="signature" />
                <uses-permission android:name="com.galgomedia.planvitalapp.permission.C2D_MESSAGE" />
                <permission android:name="com.galgomedia.planvitalapp.permission.C2D_MESSAGE" android:protectionLevel="signature"/>
                <activity android:name="com.arellomobile.android.push.PushWebview"/>
                <activity android:name="com.arellomobile.android.push.MessageActivity"/>
                <activity android:name="com.arellomobile.android.push.PushHandlerActivity"/>
                <receiver android:name="com.google.android.gcm.GCMBroadcastReceiver" android:permission="com.google.android.c2dm.permission.SEND">
                    <intent-filter>
                       <!-- Receives the actual messages. -->
                        <action android:name="com.google.android.c2dm.intent.RECEIVE"/>
                        <!-- Receives the registration id. -->
                        <action android:name="com.google.android.c2dm.intent.REGISTRATION"/>
                        <category android:name="com.galgomedia.planvitalapp"/>
                    </intent-filter>
                    <intent-filter>
                        <action android:name="com.pushwoosh.test.MESSAGE"/>
                        <category android:name="android.intent.category.DEFAULT"/>
                    </intent-filter>
                    <intent-filter>
                        <action android:name="android.intent.action.MAIN" />
                        <category android:name="android.intent.category.LAUNCHER" />
                    </intent-filter>
                </receiver>
                <service android:name="com.arellomobile.android.push.PushGCMIntentService"/>
            </application>
        </manifest>
    </android>