Android Deep Linking

AndroidManifest.xml

<!-- Deep Link Activity : Start -->
        <activity
            android:name=".deeplinks.LinkDispatcherActivity"
            android:alwaysRetainTaskState="true"
            android:launchMode="singleTask"
            android:noHistory="true"
            android:theme="@android:style/Theme.Translucent.NoTitleBar">
            <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="example-scheme"/>
                <data android:host="accounts"/>
                <data android:host="secureinbox"/>
                <data android:host="profile"/>
            </intent-filter>
        </activity>
<!-- Deep Link Activity : End -->

IntentHelper.kt

class IntentHelper {

    companion object {
        const val EXTRA_SECURE_INBOX_QUERY = "com.bale.deeplinkdemo.deeplinks.intents.Intents.EXTRA_SECURE_INBOX_QUERY"
        const val EXTRA_PROFILE_QUERY = "com.bale.deeplinkdemo.deeplinks.intents.Intents.EXTRA_PROFILE_QUERY"
        const val EXTRA_PROFILE_CHOICE = "com.bale.deeplinkdemo.deeplinks.intents.Intents.EXTRA_PROFILE_CHOICE"
    }

    fun newAccountsActivityIntent(context: Context): Intent {
        val intent: Intent = Intent(context, AccountsActivity::class.java)
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
        return intent
    }

    fun newLoginIntent(context: Context, isDeepLinkFlow: Boolean): Intent {
        val intent: Intent = Intent(context, LoginActivity::class.java)
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
        intent.putExtra("IS_DEEP_LINK_FLOW", isDeepLinkFlow)
        return intent
    }

    fun newSecureInboxActivityIntent(context: Context, query: String): Intent {
        val intent: Intent = Intent(context, SecureInboxActivity::class.java)
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
        intent.putExtra(EXTRA_SECURE_INBOX_QUERY, query)
        return intent
    }

    fun newProfileActivityIntent(context: Context, query: String, choice: Int): Intent {
        val intent: Intent = Intent(context, ProfileActivity::class.java)
        intent.addFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP)
        intent.putExtra(EXTRA_PROFILE_QUERY, query)
        intent.putExtra(EXTRA_PROFILE_CHOICE, choice)
        return intent
    }
}

LinkDispatcherActivity.kt

  override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState)
    val mMapper = UriToIntentMapper(this, IntentHelper())
    try {
            mMapper.dispatchIntent(intent, true)
    } 
    catch (iae: IllegalArgumentException) {
      if (BuildConfig.DEBUG) {
        Log.e("Deep links", "Invalid URI", iae)
      }
    } 
    finally {
      // Always finish the Activity so that it doesn't stay in our history
      finish()
    }
 } 

UriToIntentMapper.kt

lass UriToIntentMapper(private val mContext: Context, private val mIntents: IntentHelper) {

    fun dispatchIntent(intent: Intent, isLoginRequired: Boolean = true) {
        val uri = intent.data
        var dispatchIntent: Intent? = null

        if (uri == null) throw IllegalArgumentException("Uri cannot be null")

        val scheme = uri.scheme.toLowerCase()
        val host = uri.host.toLowerCase()

        if ("example-scheme" == scheme) {
            dispatchIntent = mapAppLink(uri)
        }

        if (dispatchIntent != null) {
            if(isLoginRequired) {
                (mContext as LinkDispatcherActivity).startActivityForResult(mIntents.newLoginIntent(mContext, true), 111)
            }
            else
                mContext.startActivity(dispatchIntent)
        }
    }

    private fun mapAppLink(uri: Uri): Intent? = when (uri.host.toLowerCase()) {
        "accounts"      -> mIntents.newAccountsActivityIntent(mContext)
        "secureinbox"   -> mIntents.newSecureInboxActivityIntent(mContext,
                            uri.getQueryParameter("query"))
        "profile"       -> mIntents.newProfileActivityIntent(mContext,
                            uri.getQueryParameter("query"),
                            Integer.parseInt(uri.getQueryParameter("choice")))
        else            -> null
    }

}