Android Dev

Renderscript is a key new Honeycomb feature which we haven’t yet discussed in much detail

Renderscript is a new API targeted at high-performance 3D rendering and compute operations. The goal of Renderscript is to bring a lower level, higher performance API to Android developers. The target audience is the set of developers looking to maximize the performance of their applications and are comfortable working closer to the metal to achieve this

Renderscript has been used in the creation of the new visually-rich YouTube and Books apps. It is the API used in the live wallpapers shipping with the first Honeycomb tablets.

Split out many internal classes into top-level classes. Removed unnecessary class (ActionList). Added support for fetching a specific Action (View) from the bar by index. Minor syntactic changes to improve performance.

<!-- 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.

This is androidpatterns.com, a set of interaction patterns that can help you design Android apps. An interaction pattern is a short hand summary of a design solution that has proven to work more than once. Please be inspired: use them as a guide, not as a law.

GreenDroid is a development library for the Android platform. It is intented to make UI developments easier and consistent through your applications

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.

The action bar: is located at the top of the screen to support navigation and highlight important functionalities replaces the title bar (which is often included into it) is best used for actions across your app, like search, refresh and compose can provide a quick link to app homeby tapping the app logo is preferably not contextual, but actions can differ from page to page

Use when You want to bring key actions on screen, so they are in sight. You don't want to hide them under the menu-button. The action bar is best used for common actions like search, refresh and compose. When screen real estate is valuable, consider putting actions in the options menu.

The concept of ActionBar has been introduced with the Twitter application for Android. More recently, we have seen this widget in the Google I/O 2010 schedule application. To sum up, an ActionBar can be considered as an advanced title bar that is capable of: containing several ActionBaritems (similar to buttons) being styled so that the general look’n'feel of the application is in accordance with the underlying brand/visual identity containing a title to show the user a summary of the screen content featuring several user interaction pattern.

让我们惊奇的是自从 Matias Duarte 加入 Google 之后 Android 的用户界面已经发生了很多改变和改进。Matias 以前工作于 Sidekick、Helio 和 Palm 的 WebOS，所以 Android 与他是完美的组合。仅 9 个月，Matias Duarte 和他的团队就解决了很多 Android 用户界面的不足之处：虚拟键盘不够好，平庸的多任务界面，隐藏的菜单需要点击按钮才能显示，而且软键盘不够灵活固定在了单一的方向等。

在 Android Honeycomb 中用导航栏和命令动作取代了隐藏菜单

This widget allows users to input their address, and perform validation on this by talking to an address data server. The UI part is Android-specific, but there is potential to re-use the backend and have different UIs (such as GWT) that interface with it. More information will be written here soon on how to integrate this with your android project and our future plans with regards to making the widget available outside the Android environment.

oogle's common Java library for parsing, formatting, storing and validating international phone numbers. Optimized for running on smartphones. A direct port to Javascript is also available.

Gson is a Java library that can be used to convert Java Objects into its JSON representation. It can also be used to convert a JSON string to an equivalent Java object. Gson can work with arbitrary Java objects including pre-existing objects that you do not have source-code of.