Application Not installed in your phone

Question

I run the application in the emulator it works successfully and the icon of the application is show in the emulator menu but when i try to run again that app from the emulator menu it can't allow me to run from that and display the Toast "Application is Not installed in your phone".

In the Image the red rounded is my application icon.

Answer 1

This can happen if you have your MainActivity declared twice in your AndroidManifest.xml,

first as a launhcer

<activity android:name=".MyActivity" android:label="@string/app_name">  
    <intent-filter>
                <action android:name="android.intent.action.MAIN" />
                <category android:name="android.intent.category.LAUNCHER" />
    </intent-filter>
</activity>

and then just declared like:

<activity android:name=".MyActivity" />

So check for this and delete the second extra declaration.

Answer 2

Also, it happened to me once when I changed the launch activity. Reinstalling the application and restarting the phone make it work.