android - App icon missing -

my app icon missing manifest:

<application     android:allowbackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:theme="@style/apptheme" >     <activity         android:name=".mainactivity"         android:label="@string/title_activity_main" >         <intent-filter>             <action android:name="android.intent.action.main"/>             <category android:name="android.intent.category.default"/>          </intent-filter>     </activity> </application> 

the resources in correct place , don't nothing strange manifest. think problem deploy device android studio, because when use old manifest obtained vcs, problem continue.

the original manifest.xml:

<?xml version="1.0" encoding="utf-8"?> <application     android:allowbackup="true"     android:icon="@mipmap/ic_launcher"     android:label="@string/app_name"     android:theme="@style/apptheme" >     <activity         android:name=".mainactivity"         android:label="@string/title_activity_main" >     </activity> </application> 

for deploying, use default run configuration of android studio or android application.

edit: problem solved: problem in line:

<category android:name="android.intent.category.default"/> 

if put in place following line:

<category android:name="android.intent.category.launcher"/> 

the icon back.

the problem in line:

<category android:name="android.intent.category.default"/> 

if put in place following line:

<category android:name="android.intent.category.launcher"/> 

the icon back.