Group items tagged

5 down vote accepted One solution is to implement an OnScrollListener and make changes (like adding items, etc.) to the ListAdapter at a convenient state in its onScrollStateChanged method. The following ListActivity shows a list of integers, starting with 40, adding 10 per scroll-stop.

public class Test extends ListActivity implements OnScrollListener {    Aleph0 adapter = new Aleph0();    protected void onCreate(Bundle savedInstanceState) {        super.onCreate(savedInstanceState);        setListAdapter(adapter);         getListView().setOnScrollListener(this);    }    public void onScroll(AbsListView v, int i, int j, int k) { }    public void onScrollStateChanged(AbsListView v, int state) {        if(state == OnScrollListener.SCROLL_STATE_IDLE) {                adapter.count += 10;                adapter.notifyDataSetChanged();        }    }    class Aleph0 extends BaseAdapter {        int count = 40;        public int getCount() { return count; }        public Object getItem(int pos) { return pos; }        public long getItemId(int pos) { return pos; }        public View getView(int pos, View v, ViewGroup p) {                TextView view = new TextView(Test.this);                view.setText("entry " + pos);                return view;        }    }}

You should obviously use separate threads for long running actions (like loading web-data) and might want to indicate progress in the last list item (like the market or gmail apps do).

Authentication with App Engine, regardless of where you're doing it, is a three-stage process: Obtain an authentication token. This can be done with ClientLogin for installed apps, for example, or with AuthSub for a webapp. When logging in directly to an application, this is the part of the login process where your user sees a Google signin screen. Take that authentication token, and use it to obtain an authentication cookie. Use that authentication cookie in all subsequent requests.

<uses-permission android:name="android.permission.GET_ACCOUNTS"></uses-permission> <uses-permission android:name="android.permission.USE_CREDENTIALS"></uses-permission> <uses-permission android:name="android.permission.INTERNET"></uses-permission>

For those of you that haven’t tried Dropbox, it’s a service that makes it remarkably easy to share files between multiple computers (it means you don’t have to keep emailing files between your home and work computers, or rely on a clunky USB stick). It’s also great for collaboration — we’ve been using it around the TechCrunch office to share files for years now

面向杂志、报纸数字化发布的德国软件公司 Neofonie GmbH 近日发布了自己的平板电脑——WePad 以配合自家的内容发布平台 WeMagazine。

Neofonie 表示产品预期在今年 4 月发售，有可能早于 iPad 在欧洲的发售日期。WePad 的规格表看起来确实很美，增加了很多 iPad 缺失的重要功能，但至关重要的软件系统最终表现如何还无从得知。对于一家基本没有操作系统开发经验的小公司而言，这是一个相当有挑战性的任务。

But in practice, you will notice that the AsyncTask is limited to 10 threads. This number is hardcoded somewhere in the Android SDK so we cannot change this. In this case it’s a limitation we cannot live with, because often more than 10 images are loaded at the same time.

I’ve shown you how to improve performance of a ListView in three different ways: By loading images in a seperate thread By reusing rows in the list By caching views within a row

我们都知道Intel一直在试图将Android带到自己的Atom平台上，1个月前他们宣布了Atom已经可以成功运行Android和Meego系统，今天他们又透露了这颗Atom芯片的一些技术细节。 这颗Atom芯片属于Z6xx系列，在手机上可达到1.5GHz的主频，在平板上更是可以摸高到1.9GHz的速度，足以提供1080p视频的解码和720p视频的录制，帮助3D显卡闲置功耗降低50倍以上，等于多赋予电池10天的待机。这个新的芯片组应该可以提供长达2天的音频回放和4-5小时的视频浏览。 对Android的支持方面，Z6xx平台可支持标准的WiFi、3G/HSPA和WiMAX无线连接。之前传说Google和索尼联手打造的Android TV就内置了Intel的Atom芯片，那么很可能就是Z6xx系列，我们会在5月19日的Google I/O大会上见到运行Android的Atom芯片的庐山真面目。

软键盘软件公司 Swype 表示自己的技术将在年底前被用在 1000 万部智能手机上。 该公司 CEO Mike McSherry 在接受采访时表示美国四大移动运营商今夏都会提供预知 Swype 输入法的手机。欧亚和南美洲的移动运营商也将提供同类产品。他说：“我们希望让它（Swype）成为每一款触屏产品的标准键盘，现在已经有了一些大的进展”

This projects aims to provide a reusable action bar widget. The action bar replaces the default title and is therefor located at the top of the screen. The action bar highlights important actions. The action bar pattern is well documented over at Android Patterns. The action bar widget is an Library Project. This means that there's no need to copy-paste resources into your own project, simply add the action bar widget as a reference to your existing project.

<!-- Variation on the Light theme that turns off the title --><style name="Theme.IOSched" parent="android:style/Theme.Light">    <item name="android:windowNoTitle">true</item>    <item name="android:windowContentOverlay">@null</item></style>

The android:windowContentOverlay is your shadow, and setting it to @null in your theme will eliminate it. You can see this in action in the Google I|O 2010 conference app, which uses many of the same UI conventions as does the new Twitter app. However, right now, the Twitter app has not yet been open-sourced, which is why I point you to the I|O app. The code fragment above is from that app's styles.xml resource.

Consumers want immediate access to what’s relevant and QR codes are being used to make that possible.

Bar codes are linear one-dimensional codes and can only hold up to 20 numerical digits, whereas QR codes are two-dimensional (2D) matrix barcodes that can hold thousands of alphanumeric characters of information. Their ability to hold more information and their ease of use makes them practical for small businesses.

When you scan or read a QR code with your iPhone, Android or other camera-enabled Smartphone, you can link to digital content on the web; activate a number of phone functions including email, IM and SMS; and connect the mobile device to a web browser.

This is a compact and straightforward library for parsing SVG files and rendering them in an Android Canvas. By using vector art, the pain of supporting various screen sizes and densities in Android can be reduced. This was the library used to render the artwork and the interface of Androidify. The project also includes a Live Wallpaper app extracted from Androidify. The app shows off the SVG library, and demonstrates the rendering pipeline used to draw the Androids.

An open source project to provide push notification support for Android -- a xmpp based notification server and a client tool kit. This project is currently being hosted at http://sourceforge.net/projects/androidpn/.

上图是AndroLib.com统计的Android Market应用数量图表，可以看到截至7月1日应用数量已经超过9万大关，按照这个增速计算在7月里Android Market应用数量肯定会突破10万大关。要知道一年前这个数量还不到1万。

Bump™ makes sharing photos, contacts, and apps with people as simple as bumping your phones together. Compatible with Android to iPhone too!

Bump for Android is an awesome app for quickly exchanging Contact info, Pictures and even Android apps! It’s such an easy way to share information on smartphones running the Bump app. It even works between Android and iPhones, so not just Android to Android or iPhone to iPhone bumps, but a mix of any phone running the app. Many users complain that you can’t Bump music transfers but understand there are legal issues involved there, something I’m sure Bump would not knowingly want to get involved with.

We compared these findings with that of our tests of Apple's mobile Safari browser on the iPhone 4. The results show that the Android device delivers significantly faster JavaScript execution than the iPhone, scoring over three times better on V8 and almost twice as fast on SunSpider

你可以在 EyE-Sight 站点了解到更多关于这一功能的消息，也可以通过下面的视频来了解更多细节。 继续观看视频：

To find your minimum width and height in density-independent pixels (dp), use this formula: (number of cells * 74) - 2

how often the App Widget framework should request an update from the AppWidgetProvider by calling the onUpdate() method

exactly on time

惠普旗下的Palm公司已确认，公司副总裁、webOS UI设计负责人、著名移动用户体验设计大师Matias Duarte将离职。而来自Google方面的消息，Duarte将加入Google，出任Android用户体验总监一 职。由于历史上Matias Duarte在跳槽时，总是带着自己的团队同行，所以很可能Palm原设计团队的其他人也会随之而去。这其实并不奇怪，Duarte本来就是 Android之父Andy Rubin 2000年创办的公司Danger的设计总监。 2005年Danger被微软收购后（最近推出的Kin手机来自Danger），Duarte加盟 Helio公司（由EarthLink与SK合资创办，现在是Springt-Nextel的一部分）任副总裁，负责体验设计。2007年加盟Palm， 主导webOS的UI设计。无论是Danger、Helio还是Palm webOS，其界面设计都广受好评，可惜产品本身生不逢时。尤其是webOS， 曾被许多开发者称为在创新性上唯一能与iPhone相提并论的操作系统。

Matias Duarte，在产品管理、信息架构、交互设计、视觉设计、用户研究等领域均有很深造诣的设计大 师。1996年毕业于马里兰大学。拥有计算机科学学位，并辅修了艺术和艺术史。大学期间曾经开发了一款免费游戏软件，并连续三年获得Linux Journal的读者选择奖。1996年为Atari公司（乔布斯曾经在此打工）的游戏担任过主设计师。1997年在创业公司 MagicArts任合伙人兼设计副总裁。2000年加入Danger，任设计总监，领导了SideKick产品的设计。2005年加盟Helio。 2007年加盟Palm。 曾荣获2002年Wired Rave大奖，美国国家设计奖提名，拥有9个美国实用专利和2个设计专利。 他的自我介绍上这样描述自己的目标：To create great products that make people smile.（创造使人微笑的优秀产品。）