Custom URL Schemes: Tap a button in the "Source" app and have it open "Target" Works in iOS and Android. For the Target app's manifest, you'll need to create a PROJECT_DIR/platform/android folder and put the file in there. This is an Alloy-based demo, tested on Titanium 3.0.0.GA.

Source_app_index.js

function doClick(e) {  
	if(OS_IOS) {
		if(Ti.Platform.canOpenURL('Urlschemes://')) {
			Ti.Platform.openURL('Urlschemes://');
		} else {
			alert('You must install the Urlschemes app first');
		}
	} else {
		var didItWork = Ti.Platform.openURL('urlschemes://');
		if(!didItWork) {
			alert('You need to install the URLSchemes app');
			// in a live app, you'd want to provide a link to or open the Market
			// such as Ti.Platform.openURL('market://details?id=com.company.yourapp');
		}
	}
}

$.index.open();

Source_app_index.xml

<Alloy>
  <Window class="container">
		<Button id="btn_launchit" onClick="doClick">Open URLSchemes App</Button>
	</Window>
</Alloy>

Target_app_tiapp.xml

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
	package="com.appcelerator.urlschemes" android:versionCode="1"
	android:versionName="1">
	<uses-sdk android:minSdkVersion="8" />

	<!-- TI_MANIFEST -->

	<application android:icon="@drawable/appicon"
		android:label="URLSchemes" android:name="UrlschemesApplication"
		android:debuggable="false">

		<!-- TI_APPLICATION -->

		<activity android:name=".UrlschemesActivity"
			android:label="URLSchemes" android:theme="@style/Theme.Titanium"
			android:configChanges="keyboardHidden|orientation">
			<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="urlschemes" android:host=""/>
                </intent-filter>
		</activity>
		

		<activity android:name="org.appcelerator.titanium.TiActivity"
			android:configChanges="keyboardHidden|orientation" />
		<activity android:name="org.appcelerator.titanium.TiTranslucentActivity"
			android:configChanges="keyboardHidden|orientation"
			android:theme="@android:style/Theme.Translucent" />
		<activity android:name="org.appcelerator.titanium.TiModalActivity"
			android:configChanges="keyboardHidden|orientation"
			android:theme="@android:style/Theme.Translucent" />
		<activity android:name="ti.modules.titanium.ui.TiTabActivity"
			android:configChanges="keyboardHidden|orientation" />
		<activity android:name="ti.modules.titanium.ui.android.TiPreferencesActivity" />

		<service android:name="org.appcelerator.titanium.analytics.TiAnalyticsService"
			android:exported="false" />
		

	</application>

	<uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
	<uses-permission android:name="android.permission.ACCESS_NETWORK_STATE"/>
	<uses-permission android:name="android.permission.WRITE_EXTERNAL_STORAGE"/>
	<uses-permission android:name="android.permission.INTERNET"/>
	

</manifest>