android - Play Store having new version of the app, but not showing update

Question

I have my app installed in my cell with version 1.0.5 ( Version code 9)

In Google Play Store, I can see my app with version 1.0.7 ( Version code 11 ), but it doesn't show me the button update ( it is showing me the button "Open")

Is it something I have to include in my app???

Is it a bug in Play Store???

Is it a configuration problem???

I join my AndroidManifest.xml

<uses-sdk
    android:minSdkVersion="16"
    android:targetSdkVersion="20" />

<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="com.google.android.providers.gsf.permission.READ_GSERVICES" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="com.spg.googlemaps.permission.MAPS_RECEIVE" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-permission android:name="android.permission.WRITE_SETTINGS" />

<!--
<uses-permission android:name="android.permission.RECEIVE_BOOT_COMPLETED" />
<uses-permission android:name="android.permission.WAKE_LOCK" />
<uses-permission android:name="android.permission.BATTERY_STATS" />
-->
<uses-feature
    android:name="android.hardware.camera"
    android:required="true" />
<uses-feature
    android:name="android.hardware.camera.front"
    android:required="false" />

<permission
    android:name="com.spg.googlemaps.permission.MAPS_RECEIVE"
    android:protectionLevel="signature" />

<uses-feature
    android:glEsVersion="0x00020000"
    android:required="true" />

<application
    android:name="com.myapp.MyApplication"
    android:allowBackup="true"
    android:icon="@drawable/ic_launcher"
    android:label="@string/app_name"
    android:logo="@drawable/ic_logo"
    android:theme="@style/Theme.AppCompat" >
    <uses-library android:name="com.google.android.maps" />

    <meta-data
        android:name="com.google.android.gms.version"
        android:value="@integer/google_play_services_version" />

    <activity
        android:name="com.myapp.SplashScreen"
        android:label="@string/app_name"
        android:noHistory="true"
        android:screenOrientation="portrait"
        android:theme="@android:style/Theme.Black.NoTitleBar" >
        <intent-filter>
            <action android:name="android.intent.action.MAIN" />

            <category android:name="android.intent.category.LAUNCHER" />
        </intent-filter>
    </activity>
    <activity
        android:name="com.myapp.LoginActivity"
        android:label="@string/title_activity_login"
        android:noHistory="true"
        android:screenOrientation="portrait"
        android:windowSoftInputMode="adjustResize|stateVisible" >
    </activity>
    <activity
        android:name="com.myapp.DashBoard"
        android:label="@string/app_name"
        android:screenOrientation="portrait" >
    </activity>
    <activity
        android:name="com.myapp.FragmentTabsPdv"
        android:label="@string/app_name"
        android:screenOrientation="portrait" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.myapp.DashBoard" />
    </activity>

    <meta-data
        android:name="com.google.android.maps.v2.API_KEY"
        android:value="@string/maps_key" />

    <activity
        android:name="com.myapp.RutaActivity"
        android:label="@string/title_activity_ruta"
        android:screenOrientation="portrait" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.myapp.FragmentTabsPdv" />
    </activity>
    <activity
        android:name="com.myapp.BaseActivity"
        android:label="@string/title_activity_base"
        android:screenOrientation="portrait" >
    </activity>
    <activity
        android:name="com.myapp.SettingsActivity"
        android:label="@string/title_activity_settings"
        android:screenOrientation="portrait" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.myapp.DashBoard" />
    </activity>
    <activity
        android:name="com.myapp.InformacionPdvActivity"
        android:label="@string/infoPdv"
        android:screenOrientation="portrait" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.myapp.RutaActivity" />
    </activity>

    <receiver android:name="com.myapp.BaseActivity$NetworkChangeReceiver" >
        <intent-filter>
            <action android:name="android.net.conn.CONNECTIVITY_CHANGE" />
        </intent-filter>
    </receiver>

    <activity
        android:name="com.myapp.MetricaTabs"
        android:label="@string/title_activity_metrica_tabs"
        android:screenOrientation="portrait"
        android:windowSoftInputMode="adjustPan" >
        <meta-data
            android:name="android.support.PARENT_ACTIVITY"
            android:value="com.myapp.RutaActivity" />
    </activity>

    <meta-data
        android:name="com.crashlytics.ApiKey"
        android:value="7d80161d908dd5424f232598dba254c7d2a43307" />

    <activity
        android:name="com.myapp.SendMessageActivity"
        android:label="@string/title_activity_send_message" >
    </activity>
</application>

Answer 1

Make sure the app you have installed in your mobile is not an apk built with debug keystore. The play store will show always as "Open" button instead of "Update" if the play store app certificate doesn't match with the installed app certificate. I realized this when I did trial and error with debug and signed apk's only signed apk worked. And always use versionCode for comparing versions instead of versionName.