onResume() works only when app launched through launcher icon other than by pressing open button when installing

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Mobile

Android

Hi Friends,
Install my app from apk file copied to sd card Open it by clicking "open" button after installation.
In this scenario, if user clicks home button when using the app and reopens the app by using launcher icon, last viewed screen is NOT showing up. Instead it starts from login page. Also app not listed under Recent Apps list. Here is my manifest file:

    <uses-permission android:name="android.permission.READ_PHONE_STATE" />
    <uses-permission android:name="android.permission.INTERNET" />
    <uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
    <uses-permission android:name="android.permission.DISABLE_KEYGUARD" />
    <uses-permission android:name="android.permission.KILL_BACKGROUND_PROCESSES" />
    <uses-permission android:name="android.permission.CLEAR_APP_CACHE" />

    <application
        android:clearTaskOnLaunch="true"
        android:excludeFromRecents="true"
        android:icon="@drawable/icon"
        android:label="@string/app_name"
        android:theme="@android:style/Theme.Light.NoTitleBar.Fullscreen" >
        <activity
            android:name="com.riyamobile1.android.MainActivity"
            android:clearTaskOnLaunch="true"
            android:excludeFromRecents="false"
            android:label="@string/app_name"
            android:noHistory="false" >
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
        
        <activity
            android:name="com.riyamobile1.android.FlightSearchActivity"
            android:configChanges="orientation|keyboardHidden"
            android:windowSoftInputMode="adjustPan" />
        <activity android:name="com.riyamobile1.android.FlightSearchActivityy" />
 
</manifest>