10
Other UI Components Android Training By Khaled Anaqwa
| Date post: | 09-May-2015 |
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Other UI ComponentsAndroid Training
By Khaled Anaqwa
ScrollView Layout container for a view hierarchy that can be
scrolled by the user,Allowing it to be larger than the physical display.
A ScrollView is a FrameLayout, meaning you should place one child in it containing the entire contents to scroll; this child may itself be a layout manager with a complex hierarchy of objects.
A child that is often used is a LinearLayout in a vertical orientation, presenting a vertical array of top-level items that the user can scroll through.
You should never use a ScrollView with a ListView,because ListView takes care of its own vertical scrolling.
Most importantly, doing this defeats all of the important optimizations in ListView for dealing with large lists, since it effectively forces the ListView to display its entire list of items to fill up the infinite container supplied by ScrollView.
ScrollView only supports vertical scrolling. For horizontal scrolling, use HorizontalScrollView.
Task Two Scrollview
Vertical Horizontal
Rounded Corners Borders Transparent
Colors
WebView A View that displays web pages. This class is the basis upon which you can roll
your own web browser or simply display some online content within your Activity.
It uses the WebKit rendering engine to display web pages.
you must add the INTERNET permissions to your Android Manifest file:
<uses-permission android:name="android.permission.INTERNET" />
Usagewebview.loadUrl("http://slashdot.org/");
// OR, you can also load from an HTML string: String summary = "<html><body>You scored <b>192</b> points.</body></html>"; webview.loadData(summary, "text/html", null);
By default, a WebView provides no browser-like widgets.
does not enable JavaScript and web page errors are ignored.
If your goal is only to display some HTML as a part of your UI, this is probably fine.
If you actually want a full-blown web browser, then you probably want to invoke the Browser application with a URL Intent rather than show it with a WebView.
Basic usageUri uri = Uri.parse("http://www.google.com"); Intent intent = new Intent(Intent.ACTION_VIEW, uri); startActivity(intent);
Building Web Apps in WebView? A common scenario in which using
WebView is helpful is when you want to provide information in your application that you might need to update, such as an end-user agreement or a user guide.
Within your Android application, you can create an Activity that contains a WebView, then use that to display your document that's hosted online.
