Android Dev

$ sudo gedit /etc/udev/rules.d/99-android.rules

$ sudo restart udev

$ adb kill-server $ adb start-server

// go full screen WindowManager.LayoutParams attrs = mActivity.getWindow().getAttributes (); attrs.flags |= WindowManager.LayoutParams.FLAG_FULLSCREEN; mActivity.getWindow().setAttributes(attrs); // go non-full screen WindowManager.LayoutParams attrs = mActivity.getWindow().getAttributes (); attrs.flags &= (~WindowManager.LayoutParams.FLAG_FULLSCREEN); mActivity.getWindow().setAttributes(attrs);

它已经上市一个月了，但 Android 3.0 的生态环境却没有显示出应有的活力，至今只有约 50 款专用软件上架

移动开发者 Justin Williams 在接受《连线》采访时说：“当年苹果的做法很明智，在 iPad 推出之前几个月就放出了开发工具。相比之下，Google 的开发者只是在 XOOM 发售之前几天才拿到开发工具。”所以在 iPad 发售时，商店里已经有了 1000 个专用软件。当 XOOM 发售时，这个数字是 15 。

还有另外一个原因导致开发者的热情不足，就是 Google 只把系统代码开放给了几个大厂商，例如摩托罗拉，三星，HTC 。大多数设备制造商和开发者根本接触不到 Android 3.0 的代码和技术细节，所以拖累了软件的开发进度

Adds multi-touch zoom to; ImageViews, WebViews, and MapViews. Simply use the corresponding object in place of the default, and the "pinch" functionality will be usable. Also includes misc. Views which can be useful for development.

另外关于Android 2.3版系统的特性也有了新的消息，在姜饼系统中主要针对电源管理做了优化，可以让手机的续航时间得到大幅度的提升，新系统将提供一个新的拨号界面以及用户界面系统的整体性调整，并加入了视频聊天功能

Android开发团队还制作了一个全新的复制粘贴系统（不仅仅是文本的复制粘贴），系统集成的社交网络功能得到完善，Google新推出的WebM视频格式也将会得到支持

Information about the current build, extracted from system properties.

Overall information about the contents of a package. This corresponds to all of the information collected from AndroidManifest.xml.

The <uses-library> reference is required

The certificate you use to sign your application must match the certificate that is associated with the API Key in your MapView objects.

degrees * 1e6

Before the addOverlay() method is called

Add this at the top of the HelloItemizedOverlay class

Android's search framework provides a user interface in which users can perform a search and an interaction layer that communicates with your application, so you don't have to build your own search Activity. Instead, a search dialog appears at the top of the screen at the user's command without interrupting the current Activity.

If you're managing the cursor yourself the cleanest way to go is probably this: Cursor cursor = getContentResolver().query(...); try {     // read from the cursor and do stuff } finally {     if (cursor != null) cursor.close(); }

Another option if you still want to use Activity.managedQuery() is to get your information and then: stopManaging(cursor); cursor.close(); Cheers, Justin Android Team @ Google

我看到一个最简洁的回复是（让我一直记得，哈哈）： layout_gravity是本元素相对于父元素中的位置 gravity是本元素中内容相对自己的位置

1. you can look at the video from Google IO conference 2009, called Turbo charging your UI's by Romain Guy; he discussed some of the optimizations you can do when working with ListViews. 2. You can read Mark Murphy's series of ListView tutorials at android guys titled Fancy ListViews: http://www.google.co.in/url?sa=t&source=web&ct=res&cd=4&ved=0CBYQFjAD...

The fact that sub-menus don't support icons. http://developer.android.com/intl/fr/guide/topics/ui/menus.html <http://developer.android.com/intl/fr/guide/topics/ui/menus.html> *Icon Menu * This is the collection of items initially visible at the bottom of the screen at the press of the MENU key. It supports a maximum of six menu items. *These are the only menu items that support icons* and the only menu items that *do not* support checkboxes or radio buttons.

Try to use PopUpWindow <http://developer.android.com/reference/android/widget/PopupWindow.html>class. Here you have an example<http://www.anddev.org/how_to_create_a_popupwindow-t1259.html>

I haven't looked in details at the 3 other approaches but I know that a big difference between what I do in Shelves and what I've seen done in other places is how user interaction is handled. Shelves listens to scroll events on the ListView and tries to identify taps vs scrolls vs fling to always give priority to the UI. For instance, when you touch the screen to stop a fling, Shelves starts loading images, but does so only after a very short delay so that if you are touching the screen to fling some more, the fling animation won't stutter because of the extra work load. But that's details.