how to launch an android app with custom url scheme -

i want launch app custom url scheme. checked deep links section on dev android , here snippet of code. doesnt seem fire though url looks : myapp://?host=myhost.com

manifest :

<intent-filter>     <action android:name="android.intent.action.main" />      <category android:name="android.intent.category.launcher" />     <category android:name="android.intent.category.browsable" />      <data android:scheme="myapp" /> </intent-filter> 

in activity main activity, have :

intent intent = getintent(); uri uri = intent.getdata(); if (uri != null) {     string host = uri.getqueryparameter("host"); } 

the app not launch when have email has url hyperlink. also, way test ?

try this, edit intentfilter

<intent-filter>   <action android:name="android.intent.action.view"></action>   <category android:name="android.intent.category.default"></category>   <category android:name="android.intent.category.browsable"></category>   <data android:host="www.youtube.com" android:scheme="http"></data> </intent-filter> 

edit

<intent-filter>     <action android:name="android.intent.action.main" />     <category android:name="android.intent.category.launcher" /> </intent-filter>   <intent-filter>   <action android:name="android.intent.action.view"></action>   <category android:name="android.intent.category.default"></category>   <category android:name="android.intent.category.browsable"></category>   <data android:host="www.youtube.com" android:scheme="http"></data> </intent-filter>