improved the address bar hiding logic to support Android as well by d…

…etermining up-front which hiding number should be used. Fixes #1673. Fixes #1322. Fixes #1786.

js/jquery.mobile.core.js

@@ -96,7 +96,10 @@
 
 		//scroll page vertically: scroll to 0 to hide iOS address bar, or pass a Y value
 		silentScroll: function( ypos ) {
-			ypos = ypos || 0;
+			if( $.type( ypos ) !== "number" ){
+				ypos = $.mobile.defaultHomeScroll;
+			}
+
 			// prevent scrollstart and scrollstop events
 			$.event.special.scrollstart.enabled = false;
 

js/jquery.mobile.init.js

@@ -106,5 +106,17 @@
 
 	//window load event
 	//hide iOS browser chrome on load
+
+	//check which scrollTop value should be used by scrolling to 1 immediately
+	//then check what the scroll top is. Android will report 0... others 1
+	//note that this initial scroll won't hide the address bar. It's just for the check.
+	window.scrollTo( 0, 1 );
+
+	//if defaultHomeScroll hasn't been set yet, see if scrollTop is 1
+	//it should be 1 in most browsers, but android treats 1 as 0 (for hiding addr bar)
+	//so if it's 1, use 0 from now on
+	$.mobile.defaultHomeScroll = ( !$.support.scrollTop || $(window).scrollTop() === 1 ) ? 0 : 1;
+
+	//call silentScroll on load to hide addr bar
 	$window.load( $.mobile.silentScroll );
 })( jQuery, this );

js/jquery.mobile.navigation.js

@@ -388,11 +388,11 @@
 
 		//get current scroll distance
 		var currScroll = $window.scrollTop(),
-			toScroll	= toPage.data( "lastScroll" ) || 0;
+			toScroll	= toPage.data( "lastScroll" ) || $.mobile.defaultHomeScroll;
 
 		//if scrolled down, scroll to top
 		if( currScroll ){
-			window.scrollTo( 0, 0 );
+			window.scrollTo( 0, $.mobile.defaultHomeScroll );
 		}
 
 		//if the Y location we're scrolling to is less than 10px, let it go for sake of smoothness