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    <p>EDIT 5/2014, as this seems to be a popular question I've added much detail to the answer:</p> <p><strong>Android:</strong></p> <p>For Android, refer to <a href="https://stackoverflow.com/questions/5596261/intent-filter-to-launch-my-activity-when-custom-uri-is-clicked">Intent Filter to Launch My Activity when custom URI is clicked</a>.</p> <p>You use an intent-filter:</p> <pre><code>&lt;intent-filter&gt; &lt;action android:name="android.intent.action.VIEW" /&gt; &lt;category android:name="android.intent.category.DEFAULT" /&gt; &lt;category android:name="android.intent.category.BROWSABLE" /&gt; &lt;data android:scheme="myapp" /&gt; &lt;/intent-filter&gt; </code></pre> <p>this is attached to the Activity that you want launched. For example:</p> <pre><code>&lt;activity android:name="com.MyCompany.MyApp.MainActivity" android:label="@string/app_name"&gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.MAIN" /&gt; &lt;category android:name="android.intent.category.LAUNCHER" /&gt; &lt;/intent-filter&gt; &lt;intent-filter&gt; &lt;action android:name="android.intent.action.VIEW" /&gt; &lt;category android:name="android.intent.category.DEFAULT" /&gt; &lt;category android:name="android.intent.category.BROWSABLE" /&gt; &lt;data android:scheme="myapp" android:host="com.MyCompany.MyApp" /&gt; &lt;/intent-filter&gt; &lt;/activity&gt; </code></pre> <p>Then, in your activity, if not running, the activity will be launched with the URI passed in the Intent. </p> <pre><code>Intent intent = getIntent(); Uri openUri = intent.getData(); </code></pre> <p>If already running, onNewIntent() will be called in your activity, again with the URI in the intent.</p> <p>Lastly, if you instead want to handle the custom protocol in UIWebView's hosted within your native app, you can use:</p> <pre><code>myWebView.setWebViewClient(new WebViewClient() { public Boolean shouldOverrideUrlLoading(WebView view, String url) { // inspect the url for your protocol } }); </code></pre> <p><strong>iOS:</strong></p> <p>For iOS, refer to <a href="https://stackoverflow.com/questions/3612460/lauching-app-with-url-via-uiapplicationdelegates-handleopenurl-working-under">Lauching App with URL (via UIApplicationDelegate&#39;s handleOpenURL) working under iOS 4, but not under iOS 3.2</a>.</p> <p>Define your URL scheme via Info.plist keys similar to:</p> <pre><code>&lt;key&gt;CFBundleURLTypes&lt;/key&gt; &lt;array&gt; &lt;dict&gt; &lt;key&gt;CFBundleURLName&lt;/key&gt; &lt;string&gt;com.yourcompany.myapp&lt;/string&gt; &lt;/dict&gt; &lt;dict&gt; &lt;key&gt;CFBundleURLSchemes&lt;/key&gt; &lt;array&gt; &lt;string&gt;myapp&lt;/string&gt; &lt;/array&gt; &lt;/dict&gt; &lt;/array&gt; </code></pre> <p>Then define a handler function to get called in your app delegate</p> <pre><code>- (BOOL)application:(UIApplication *)application openURL:(NSURL *)url sourceApplication:(NSString *)sourceApplication annotation:(id)annotation { // parse and validate the URL } </code></pre> <p>If you want to handle the custom protocol in <strong>UIWebViews</strong> hosted within your native app, you can use the UIWebViewDelegate method:</p> <pre><code>- (BOOL)webView:(UIWebView *)webView shouldStartLoadWithRequest:(NSURLRequest *)request navigationType:(UIWebViewNavigationType)navigationType { NSURL *urlPath = [request URL]; if (navigationType == UIWebViewNavigationTypeLinkClicked) { // inspect the [URL scheme], validate if ([[urlPath scheme] hasPrefix:@"myapp"]) { ... } } } </code></pre> <p>}</p> <p>For <strong>WKWebView</strong> (iOS8+), you can instead use a WKNavigationDelegate and this method:</p> <pre><code>- (void)webView:(WKWebView *)webView decidePolicyForNavigationAction:(WKNavigationAction *)navigationAction decisionHandler:(void (^)(WKNavigationActionPolicy))decisionHandler { NSURL *urlPath = navigationAction.request.URL; if (navigationAction.navigationType == WKNavigationTypeLinkActivated) { // inspect the [URL scheme], validate if ([[urlPath scheme] hasPrefix:@"myapp"]) { // ... handle the request decisionHandler(WKNavigationActionPolicyCancel); return; } } //Pass back to the decision handler decisionHandler(WKNavigationActionPolicyAllow); } </code></pre>
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    1. POAndroid / iOS - Custom URI / Protocol Handling
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    1. COOne thing I found out is that GMail (iOS app, Android app, web) removes non-standard links from emails.
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    2. CO@dzeikei we use web URLs which redirect to our custom app urls. As a bonus, we can tie it into our web/email analytics more easily.
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      1. USJason Suárez
    3. CO@JasonDenizac Yes, that's what we had to do as well but it would be a nicer user experience if you could avoid going through the browser :)
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