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After minor refractoring existing android application to new project, home screen icon got removed

I had my existing android project going unmanageable due to unnecessary research codes, so I decided to create a new project with only necessary code that's required for the app. I uploaded the same on play store's beta environment. As the app got updated on my phone, the already existing app icon on home screen got removed. Did I make any mistake in the code development?
Please help
EDIT: Added Manifest File
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example.abc"
android:installLocation="preferExternal"
android:versionCode="52"
android:versionName="5.0.004" >
<uses-sdk
android:minSdkVersion="11"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_MOCK_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<application
android:name="com.example.abc.Appname"
android:allowBackup="true"
android:icon="#drawable/launcher"
android:label="#string/app_name"
android:theme="#style/Theme.CustomTheme" >
<activity
android:name="com.example.abc.SplashScreen"
android:configChanges="orientation|keyboardHidden|screenSize"
android:label="#string/title_activity_app_name"
android:theme="#android:style/Theme.Black.NoTitleBar"
android:windowSoftInputMode="stateHidden" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
...
</manifest>

Reverted back the application name to old file name (java class) and the same in manifest file. The launcher icon was created while installing via Google play store's beta environment.
Still unsure why the application name and java class names had an impact on the launcher icons. Any idea?

install apk on samsung tablet, but I cant find it?

I have installede a app I made. When I run it from eclipse it works, but I cant find it anywhere on my tablet, when I click program (where all the apps are, it is not there) but when I run programmangere I can see it is there. I tried to download it from link, and it install, but I can still not find it anywhere on my tablet.
Any ides??
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.learn2crack.tab"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="16"
android:targetSdkVersion="19" />
<uses-permission android:name="android.permission.READ_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.MOUNT_UNMOUNT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.MOUNT_FORMAT_FILESYSTEMS"/>
<uses-permission android:name="android.permission.WRITE_SETTINGS"/>
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/AppTheme" >
<activity
android:name="com.learn2crack.tab.MainActivity"
android:label="#string/app_name" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
<data android:mimeType="text/html" />
</intent-filter>
</activity>
</application>

First connect the tablet to your pc then copy your apk file which is in the bin then paste it in your phone memory. now disconnect your device.. Goto FileManager in your tablet find the .apk and click on it install it and then open it... Hope ths will work

Reason for AVD not beeing compatible with project

When Im starting my AVD emulator from within Android studio the list of devices in the emuator shows that some of my devices are not compatible with the current project.
It doesn´t show what is not compatible. Is there any way to get to know that?
My first guess was conflicting API versions. But that seems not to be the case sice several AVD:s have the same api settings and some are compatible and others not.
This is my manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="com.example"
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.example.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=".SetLocation"
android:label="SetLocation"/>
</application>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION"/>
<uses-permission android:name="android.permission.ACCESS_COARSE_LOCATION"/>
</manifest>
And a screenshot of the list:

maybe if your applications are written for lover API version that device that you will use for testing. Can you run the application in emulator?

Install apk file in Android

I've been for the past 2 hours trying everything to install an apk in my android phone but I couldn't find a solution...
I've implemented an ArcGIS app with Sherlock Action Bars. My project as a minimum SDK Version 7, and my phone is a Android 2.3.3 (SDK Version 10). The phone is an Acer Z110 Duo.
My manifest is:
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
package="com.AEP41.main"
android:versionCode="1"
android:versionName="1.0" >
<uses-sdk
android:minSdkVersion="7"
android:targetSdkVersion="17"/>
<uses-permission android:name="android.permission.INTERNET" />
<uses-permission android:name="android.permission.ACCESS_FINE_LOCATION" />
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE" />
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" />
<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE" />
<uses-feature
android:glEsVersion="0x00020000"
android:required="true" />
<application
android:allowBackup="true"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
android:theme="#style/Theme.Sherlock" >
<activity
android:name="com.AEP41.main.AEP41Activity"
android:label="#string/app_name"
android:screenOrientation="portrait" >
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
<activity
android:name=".FieldDetails"
android:description="#string/title_activity_field_details"
android:screenOrientation="portrait" >
</activity>
</application>
</manifest>
There is something that I'm missing? Is there any settings that I need to change in my phone to install it?
Thanks in advance ;)

David Wasser is right - app must be signed. "Unknown sources" is for apps from other markets then Google Play. So export signed APK or build project and find signed APK in bin folder of project.

To allow app installs from non-Market apps, tap the menu button on your home screen, then choose Settings >> Applications >> Unknown sources.

After update the APK supports fewer devices than previously

I have a relative simple App that was already in the Play-Store of Google.
Now I've made an Update of this App.
One Point of this Update was that I include the ZBar-Scanner. The Rest of the changes were minimal and shouldn't have any influence on my problem.
I just put the newest verison of my App in the Play-Store and I get following warning:
"Warning: Active APKs support fewer devices than previously active APKs. Some users will not receive updates."
I've downloaded ZBarAndroidSDK-0.2.zip from sourceforge.net (http://sourceforge.net/projects/zbar/files/AndroidSDK/) and import it to my project as it is explained in the README-File.
I tested my App local on my HTC Wildfire S (->Version 2.3.5), on Samsung Galaxy 3 (GT-I5800 -> Version 2.2) and on my Galaxy Nexus (-> Version 4.2). There was never a Problem. Everything worked.
I also tested the exported APK and had no Problems.
Now I add this APK to the Play-Store and updated my App and I get the warning for the tested devices. Neither my HTC Wildfire, nor my Samsung Galaxy 3 can update the new version.
Can anybody help me and explain me whats the Problem?
Thanks a lot!!!
EDIT:
My Manifest:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="de.myproject"
android:versionCode="5"
android:versionName="2.0"
android:installLocation="preferExternal"
>
<uses-sdk android:minSdkVersion="8" android:targetSdkVersion="11"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.CAMERA"/>
<uses-feature android:name="android.hardware.camera" android:required="false"/>
<application
android:uiOptions="splitActionBarWhenNarrow"
android:icon="#drawable/ic_launcher"
android:label="#string/app_name"
>
<!-- enable the search dialog to send searches to SearchableActivity throughout the application -->
<meta-data
android:name="android.app.default_searchable"
android:value=".SearchableActivity" />
<activity
android:label="#string/app_name"
android:name=".MainActivity"
android:screenOrientation="portrait"
android:theme="#style/Theme.NoBackground">
<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:screenOrientation="landscape"
android:name=".zbar.ZBarScannerActivity">
</activity>
</application>
And the Manifest of ZBar:
<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
package="net.sourceforge.zbar.android.CameraTest"
android:versionCode="1"
android:versionName="1.0">
<uses-sdk android:minSdkVersion="8" />
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" />
<uses-feature android:name="android.hardware.camera.autofocus" />
<application android:label="#string/app_name" >
<activity android:name="CameraTestActivity"
android:label="#string/app_name">
<intent-filter>
<action android:name="android.intent.action.MAIN" />
<category android:name="android.intent.category.LAUNCHER" />
</intent-filter>
</activity>
</application>

First of all, any change in the devices used must be a result of the manifest. That is the only thing that the Android market (Google Play) uses to determine what devices an app can go on. As you showed, the one difference was that you had a requirement to autofocus. If you change this line to the following, it should work.
<uses-feature android:name="android.hardware.camera.autofocus" android:required="false">
Essentially, this will allow you to use that feature, but not make it required. This should allow full compatibility with all previous devices. For more information, see this answer.
I should also note that I saw the camera wasn't required by your main app, but is required by zbar. This could also make a difference.

I had this problem with my application (with Zbar scanner) on tablet Zenithink C93 (http://www.zenithink.com/Eproducts_C93.php). I needed create application compatible with Zenithink devices.
I published app in Play-Store of Google. When I tried install application on Zenithink C93 I got error: "This item is not compatible with your device"
My manifest had this line:
<uses-feature android:name="android.hardware.camera.autofocus" android:required="false">
But it didn't help me.
Also I had this support-screens tag:
<supports-screens
android:smallScreens="false" android:normalScreens="false"
android:largeScreens="true"
android:xlargeScreens="true"
android:anyDensity="true"/>
Strangely, but after a long search solution I completely removed support-screens tag and put android:required="false" for <uses-feature android:name="android.hardware.camera"/> application became compatible with Zenithink device.
Now my Manifest looks like this:
...
<uses-sdk
android:minSdkVersion="14"
android:targetSdkVersion="15"/>
<uses-permission android:name="android.permission.INTERNET"/>
<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
<uses-permission android:name="android.permission.READ_PHONE_STATE"/>
<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
<uses-permission android:name="android.permission.CAMERA" />
<uses-feature android:name="android.hardware.camera" android:required="false"/>
<uses-feature android:name="android.hardware.camera.autofocus" android:required="false"/>
<application...
This is not a good solution, because application will be compatible with almost all devices, but maybe it will help someone.