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final ActivityManager am = (ActivityManager) getSystemService(Context.ACTIVITY_SERVICE);  am.restartPackage(getPackageName());  

<uses-permission android:name="android.permission.RESTART_PACKAGES"></uses-permission>  

来自AndroidLib.com的最新统计数 据显示，2010年3月，Android应用市场里的应用增加了9331个。通过历史对比，这些数字更加惊人。比如，去年12月，新增 Android应用为3807个，到1月份为止，新增应用为4458个，2月新增5532个。3月新增9331个。如果Android保持这种增长趋势， 其应用数量很有可能在今天达到5位数，从而对苹果形成有力竞争

Droid-Fu offers both support classes meant to be used alongside existing Android code, as well as self-contained, ready-to-be-used components like new adapters and widgets. The areas tackled by Droid-Fu include: application life-cycle helpers support classes for handling Intents and diagnostics better support for background tasks super-easy and robust HTTP messaging powerful caching of Objects, HTTP responses, and remote images custom adapters and views I suggest you read this introductory article, and anything that follows.

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.