First you need to register it in your AndroidManifest.xml
To do this, put the following block inside the <application>
tag. "android:name" should correspond to the activity
you want to handle the uri... with forms you should probably just leave it as ".MainActivity".
<activity android:icon="@drawable/icon" android:label="Name of App" android:name=".MainActivity">
<intent-filter>
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<data android:scheme="YOURSCHEME" />