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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

Eclipse 编译 Android工程时，提示该错误 ：Error generating final archive: Debug certificate expired on xxxxxx（日期） 解决办法： linux：Window－－》Preferences－－》Android－－》Build中Default debug keystore显示了地址“/home/jinli/.android/debug.keystore”，删除此路径下的debug.keystore及 ddms.cfgWindow XP：进入：C:Documents and SettingsAdministrator.android 删除：debug.keystore及 ddms.cfg

// Get display for detecting the phone orientation display = ((WindowManager) getSystemService(WINDOW_SERVICE)).getDefaultDisplay(); // Get the orientation int orientation = display.getOrientation();

android.view.Display class provide a simple way to determine the phone orientation.

So the basic idea is: launch an AsyncTask making your service call, show a nifty progress dialog while the task thread is running, and have the task’s result be posted back to your activity once it completes. Cool, but what if the user decides to rotate the screen while your task is running? Or a phone call comes in, interrupting your app, and Android decides to kill it? Both these actions will effectively terminateyour activity, and recreate it when resuming (yes, a screen rotation kills your activity, very clever, isn’t it?). Unfortunately, any AsyncTask that was still running now holds a stale reference to your activity, because the restarted activity will be an entirely different object in memory (and it will go through onCreate(), as if the activity had started for the first time). I’m not entirely sure whether AsyncTask will actually post back the data to the old activity object (if it was a weak reference, it may already have been garbage collected), but in any case, your “new” activity will never see it, because it’s a different instance.

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.