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Vincent Tsao

Is it possible to update a widget from an Activity? - Android Developers | Google Groups - 0 views

groups.google.com/...3dbc6863fca7a272

android AppWidget Widget tech

shared by Vincent Tsao on 13 Jul 10 - Cached
  • An AppWidgetProvider is a BroadcastReceiver. That gives you two possibilities right off the bat: 1. Have it also handle whatever other Intents you were planning on setting up with a separate BroadcastReceiver, or 2. Send an Intent from whatever component you want to the AppWidgetProvider. In other words, don't worry about trying to talk directly to the app widget (which I suspect is impossible) -- just talk to your code that already talks to the app widget.
    • Vincent Tsao
      Vincent Tsao on 13 Jul 10
       
      good explanation
  • I update my widget from within my app, when I delete/add entries to a list. To do this, I have a method (updateWidget) and a static String (UPDATE_ACTION). My updateWidget() method sends a broadcast which is received by the widget class and then calls onUpdate() with the appropriate params: private void updateWidget() {                 Intent i = new Intent(this, TVWidget.class);                 i.setAction(TVWidget.UPDATE_ACTION);                 sendBroadcast(i);         } In TVWidget class: @Override         public void onReceive(Context context, Intent intent) {                 String action = intent.getAction();                 if (action != null && action.equals(UPDATE_ACTION)) {                         final AppWidgetManager manager = AppWidgetManager.getInstance (context);                         onUpdate(context, manager,                                         manager.getAppWidgetIds(new ComponentName(                                                         context, TVWidget.class)                                         )                         );                 }                 else {                         super.onReceive(context, intent);                 }         } This seems to work fine.
Vincent Tsao

sqlite3 in adb not in 2.2? - Android Developers | Google Groups - 0 views

groups.google.com/...d2cbd35de1a799a6

android adb sqlite

shared by Vincent Tsao on 28 Jun 10 - Cached
  • Then I went ahead and installed 2.2 and now when > I type sqlite3 in the shell it says sqlite3 not found....  Any ideas? Well, it's in the 2.2 emulator image, for what that's worth. -- Mark Murphy (a Commons Guy)
  • Vincent Tsao on 28 Jun 10
     
    Android 2.2 的真机中不再有sqlite调试工具了? WTF! ! !
  • Vincent Tsao on 08 Jul 10
     
    求助于China android dev开发小组，有了解决办法： step 1: 从其他真机或者模拟器的 /system/xbin目录下copy一份 sqlite3 step 2: 进入shell执行chmod a+x sqlite3 或者 chmod 777 sqlite3 大功告成
Vincent Tsao

How to handle screen orientation change when progress dialog and background thread acti... - 0 views

stackoverflow.com/...ss-dialog-and-background-threa

android bug orientation View not attached to window manager

shared by Vincent Tsao on 14 Jul 10 - Cached
  • When you switch orientations, Android will create a new View. You're probably getting crashes because your background thread is trying to change the state on the old one. (It may also be having trouble because your background thread isn't on the UI thread) I'd suggest making that mHandler volatile and updating it when the orientation changes.
Vincent Tsao

Possible to change between "full screen" and "with status bar"? - Android Developers | ... - 0 views

groups.google.com/...670671ee2fbea6e0

android view fullscreen

shared by Vincent Tsao on 03 Nov 10 - No Cached
  • // 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);
    • Vincent Tsao
      Vincent Tsao on 03 Nov 10
       
      these code can be simplified as below: //go full screen getWindow().addFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN); //go non-full screen getWindow().clearFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN);
  • Vincent Tsao on 03 Nov 10
     
    How to toggle fullscreen / non-fullscreen
Vincent Tsao

webView load Data problem - Android Beginners | Google Groups - 0 views

groups.google.com/...a7e8782c85076bf7

android webview loadData

shared by Vincent Tsao on 11 Nov 10 - No Cached
  • sagar wrote: > Hello, > I have following code to display webview's background. > wv.loadData("<html><body background=\"file:///android_asset/lbh.png > \">"+data[0],"text/html","utf-8"); > here the data[0] contains the data to be displayed... > Data is displayed fine.. > but background is not displayed. > I can only use this method..i dont knw why i can t access android > assets.. > I have placed that image in assets folder already.. Try loadDataWithBaseUrl() instead of loadData(), supplying some bogus value for the base URL (e.g., fake://why/o/why/is/this/needed).
    • Vincent Tsao
      Vincent Tsao on 11 Nov 10
       
      用loadDataWithBaseURL接口才能访问asset中的资源文件，且baseurl不能为null
Vincent Tsao

Window Backgrounds & UI Speed | Android Developers - 0 views

developer.android.com/...window-bg-speed.html

android background performance tech

shared by Vincent Tsao on 13 May 10 - No Cached
  • Removing the window's background can be achieved very easily by using a custom theme. To do so, first create a file called res/values/theme.xml containing the following:
  • <resources>    <style name="Theme.NoBackground" parent="android:Theme">        <item name="android:windowBackground">@null</item>    </style></resources>
  • You then need to apply the theme to your activity by adding the attribute android:theme="@style/Theme.NoBackground" to your <activity /> or <application /> tag. This trick comes in very handy for any app that uses a MapView, a WebView or any other full screen opaque view.
Kiran Kuppa

AndroidAnnotations - 0 views

androidannotations.org

android framework annotations

shared by Kiran Kuppa on 30 Mar 13 - No Cached
  • Kiran Kuppa on 30 Mar 13
     
    Using Java annotations, developers can show their intent and let AndroidAnnotations generate the plumbing code at compile time. Few Features are * Dependency injection: inject views, extras, system services, resources, ... * Simplified threading model: annotate your methods so that they execute on the UI thread or on a background thread. * Event binding: annotate methods to handle events on views, no more ugly anonymous listener classes! * REST client: create a client interface, AndroidAnnotations generates the implementation. * AndroidAnnotations provide those good things and even more for less than 50kb, without any runtime perf impact!
Vincent Tsao

ListView/ListActivity limit items until last item reached, like in Android Market - And... - 0 views

groups.google.com/...38bb05ea4f7365b9

android listview dynamic loading tech

shared by Vincent Tsao on 28 Jul 10 - Cached
  • These applications use an OnScrollListener to detect when the last item is displayed. When this happens, they load more items and add them to the list adapter.
Vincent Tsao

Mark Murphy | AndroidGuys - 0 views

www.androidguys.com/...mark-murphy

android Mark Murphy

shared by Vincent Tsao on 13 Jul 10 - Cached
  • Mark Murphy is the founder of CommonsWare and is the author of _The Busy Coder's Guide to Android Development_, _The Busy Coder's Guide to *Advanced* Android Development_, and _Android Programming Tutorials_.
  • Vincent Tsao on 13 Jul 10
     
    Articles from Mark Murphy
Vincent Tsao

Adding items to a ListView - Android Developers | Google Groups - 0 views

groups.google.com/...4de0456437f18b7a

android listview dynamic loading

shared by Vincent Tsao on 27 Jul 10 - Cached
  • SizzlingSkizzorsProgrammer wrote: > After the listview is already initialized, is it possible to add items > to it during runtime? Just add the new items to the adapter, or the data source that backs up the adapter (if it's a CursorAdapter).
Simon Pan

Application Fundamentals | Android Developers - 0 views

developer.android.com/...fundamentals.html

shared by Simon Pan on 03 Sep 10 - No Cached
  • passes
  • When onReceive() returns
  • by the system at any time
  • ...13 more annotations...
  • to start a service
  • presents
  • memory paging state
  • Broadcast receiver lifecycle
  • The activity at the top of the stack is one that's currently running
  • The root activity in the stack is the one that began the task
  • Suppose
  • keeping both activities in the same task.
  • Tasks
  • A task is a stack of activities, not a class or an element in the manifest file.
  • The current task goes into the background and the root activity for the new task is displayed.
  • Rather
  • the previous activity in the same task is displayed.
Vincent Tsao

The CommonsBlog - Activity or Notification via Ordered Broadcast - 0 views

commonsware.com/...ication-ordered-broadcast.html

android Notification Broadcast

shared by Vincent Tsao on 18 Sep 10 - No Cached
  • I’ve run into the following generalized question a lot recently: I have an event that occurs in the background. I want to update my activity, if the activity is on the screen. Otherwise, I want to raise a Notification.
  • Hence, the recipe for the activity-or-Notification pattern is: Define an action string you will use when the event occurs that you want to go to the activity or notification (e.g., com.commonsware.java.packages.are.fun.EVENT). Dynamically register a BroadcastReceiever in your activity, with an IntentFilter set up for the aforementioned action string and with a positive priority (the default priority for a filter is 0). This receiver should then have the activity do whatever it needs to do to update the UI based on this event. The receiver should also call abortBroadcast() to prevent others from getting it. Be sure to register the receiver in onStart() or onResume() and unregister the receiver in the corresponding onStop or onPause() method. Register in your manifest a BroadcastReceiver, with an <intent-filter> set up for the aforementioned action string. This receiver should raise the Notification. In your service (e.g., an IntentService), when the event occurs, call sendOrderedBroadcast(). And that’s it. If the activity is on-screen, its receiver will be registered, so it will get the event, process it, and cancel the broadcast. If the activity is not on-screen, its receiver will not be registered, so the event will go to the default handler, in the form of your manifest-registered BroadcastReceiver, which will raise the Notification.
Simon Pan

Service | Android Developers - 0 views

developer.android.com/...Service.html

android service

shared by Simon Pan on 14 Dec 10 - No Cached
  • avoid
    • Simon Pan
      Simon Pan on 14 Dec 10
       
      如果在Service裡做了要做的事，它們還是在UI thread裡做事情，而不是在什麼別的thread做事情。但是Service很特別，它又不是一個執行緒，因為通常Service要做的事情都蠻耗時的，萬一Service算是執行緒，那麼就會強碰到系統的ANR機制。
  • A facility for the application to tell the system about something it wants to be doing in the background
  • A facility for an application to expose some of its functionality to other applications.
  • ...3 more annotations...
  • two reasons
  • depending on the value they return from onStartCommand(): START_STICKY is used for services that are explicitly started and stopped as needed,
  • then take the service out of the started state and don't recreate until a future explicit call to Context.startService(Intent).
Vincent Tsao

List view with textviews and imageview, best practices - Android Developers | Google Gr... - 0 views

groups.google.com/...807a9cbb18d0239b

android lazy load image listview tech

shared by Vincent Tsao on 26 Mar 10 - Cached
  • 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...
Vincent Tsao

[TinyTut]Custom Button backgrounds/Better ImageButton :: anddev.org - Android Developme... - 0 views

www.anddev.org/-better_imagebutton-t4298.html

android button UI tech

shared by Vincent Tsao on 23 Mar 10 - Cached
  • In my_button we define 4 states (as a button has 4 states: not pressed and not focused, pressed and focused, pressed and not focused, not pressed and focused) with each of those states having their own drawable.
Vincent Tsao

kaeppler/droid-fu - GitHub - 6 views

github.com/droid-fu

android droid-fu opensource kaeppler

shared by Vincent Tsao on 18 May 11 - No Cached
  • 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.
  • Simon Pan on 19 May 11
     
    大哥你有覺得這個比AsyncTask好用嗎？
  • ...2 more comments...
  • Vincent Tsao on 19 May 11
     
    BetterAsyncTask本质就是AsyncTask，我想在用法上应该没有太大区别 但AsyncTask有个硬伤就是它的life-cycle对当前的activity的life-cycle有依赖，容易引起FC，而BetterAsyncTask解决了这个问题，Ref: http://groups.diigo.com/group/android_related/content/introducing-droid-fu-for-android-betteractivity-betterservice-and-betterasynctask-brain-flush-2838716 当然还有其他解决办法，我自己偏向于 IntentService + Broadcast mechanism的解决方案
  • Simon Pan on 19 May 11
     
    難怪你會搜尋到我布落格 呵呵
  • Vincent Tsao on 20 May 11
     
    哈哈，其实是我几个月前看了你的blog后，才有了更多的认识的
  • Simon Pan on 24 May 11
     
    在我最近的案子裡 幾乎很少機會用到IntentService。 我目前唯一用到的是AsyncTask， 而且那還是我硬用，才有機會用到它。
Vincent Tsao

Implementing "Pull To Refresh" in your Android App | Blog // Recursive Awesome // Table... - 1 views

www.recursiveawesome.com/...to-refresh-in-your-android-app

android "Pull To Refresh"

shared by Vincent Tsao on 17 May 11 - No Cached
  • For completeness we really should handle the possibility of the task getting cancelled. This can happen when the user navigates away from the app and the task is killed before its completed. This will cause the onPostExecute() method to not be called and so the onRefreshComplete() method won’t be called. Depending on how the user navigates through the app, they could return to this activity without going through the complete onCreate() lifecycle, and you’ll end up with the screen still showing the “loading” progress message in the header. This is common when using tabs between multiple ListViews. Also, the documented best practices for implementing an AsyncTask says that in long running background work you should periodically check if the task has been cancelled and try to gracefully quit your work and exit. So let’s get all of that in there.
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