Android :: How To Launch Application From Web Page?

I added to the manifest file for the activity to be launched:
<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:scheme="my_scheme"/> </intent-filter>

I load the link in WebView:
mWebView.loadData("<a href="my_scheme://launch_my_app/refresh_all ">Launch App</a>", "text/html", "utf-8");
When I click on the link I get the error -10 "The protocol is not supported" in My WebViewClient.OnReceivedError override.