// AndroidManifest.xml
...
<activity
    android:name=".MainActivity"
    android:label="@string/app_name" >
    <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"/>
        <category android:name="android.intent.category.DEFAULT"/>
        <category android:name="android.intent.category.BROWSABLE"/>
        <data android:scheme="myapp"/>
        <data android:host="webservice"/>
    </intent-filter>
</activity>



// MainActivity
protected void onCreate(Bundle savedInstanceState) {
    Intent intent = getIntent();
    if (intent != null && Intent.ACTION_VIEW.equals(intent.getAction())) {
        Uri uri = intent.getData();
        if (uri.getScheme().equalsIgnoreCase("myapp") && uri.getHost().equalsIgnoreCase("webservice")) {
            Intent settingsIntent = new Intent(MainActivity.this, WebServiceSettingsActivity.class);
            startActivity(settingsIntent);
        }
    }
}