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Handling URL Scheme

To receive incoming deep-link to your RedirectURL from the trusted webview, you need to add some setup your project.
Second Tab
Here's an example on receiving an incoming link of cotterexample://login
<activity android:name="com.example.cotterexample.Login">
<action android:name="android.intent.action.VIEW" />
<category android:name="android.intent.category.DEFAULT" />
<category android:name="android.intent.category.BROWSABLE" />
<!-- Accepts URIs that begin with "cotterexample://login" -->
<data android:scheme="cotterexample"
android:host="login" />

Read data from incoming intents

You should generally do this during onCreate() or onStart()
public void onCreate(Bundle savedInstanceState) {
// Read data from incoming intents
Intent intent = getIntent();
if (Intent.ACTION_VIEW.equals(intent.getAction())) {
Uri uri = intent.getData();
// Use this data to perform your http request to get Cotter token
String authCode = uri.getQueryParameter(AUTH_CODE);
String state = uri.getQueryParameter(STATE);
String challengeID = uri.getQueryParameter(CHALLENGE_ID);