Android TV, intercepting Dropbox SDK calls to redirect to WebView -

i developing android tv version of app dropbox connectivity. since many android tv devices don't have browsers, want intercept login intent , show login + scope permissions grant pages in webview.

i modified manifest, intent doesn't open activity anyway. suggestions? here's manifest:

        <activity         android:name=".activitywebview">         <action android:name="android.intent.action.view"/>          <category android:name="android.intent.category.default" />         <category android:name="android.intent.category.browsable" />         <category android:name="android.intent.category.app_browser" />         <data android:scheme="" android:host="www.dropbox.com"/>         <data android:scheme="http" android:host="www.dropbox.com"/>         <data android:scheme="https" android:host="www.dropbox.com"/>     </activity>