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2014/10/16 ¤W¤È 08:21:42
android Programming Glossary: queueThis Handler class should be static or leaks might occur: IncomingHandler http://stackoverflow.com/questions/11407943/this-handler-class-should-be-static-or-leaks-might-occur-incominghandler as there are messages with target handler in the message queue the handler cannot be garbage collected. If handler is not static.. some time at least as long as the messages stay int the queue. This is not much of an issue unless you post long delayed messages...
http://stackoverflow.com/questions/15524280/service-vs-intent-service Hence all the consecutive intents will go into the message queue for the worker thread and will execute sequentially. share..
How to run a Runnable thread in Android? http://stackoverflow.com/questions/1921514/how-to-run-a-runnable-thread-in-android object just as a command that can be sent to the message queue for execution and handler as just a helper object used to send..
AsyncTask won't stop even when the activity has destroyed http://stackoverflow.com/questions/2531336/asynctask-wont-stop-even-when-the-activity-has-destroyed
What is the Android UiThread (UI thread) http://stackoverflow.com/questions/3652560/what-is-the-android-uithread-ui-thread is not the UI thread the action is posted to the event queue of the UI thread. Does the UI thread mean that this will be..
How can I update a single row in a ListView? http://stackoverflow.com/questions/3724874/how-can-i-update-a-single-row-in-a-listview some text. The image is loaded in a separate thread with a queue and all and when the image is downloaded I now call notifyDataSetChanged..
Running multiple AsyncTasks at the same time — not possible? http://stackoverflow.com/questions/4068984/running-multiple-asynctasks-at-the-same-time-not-possible a second in doInBackground . AsyncTasks use a fixed size queue internally for storing delayed tasks. Queue size is 10 by default... enter their doInBackground but the rest will wait in a queue for a free worker thread. As soon as any of the first 5 finishes.. finishes and thus releases a worker thread a task from the queue will start execution. So in this case at most 5 tasks will run..
http://stackoverflow.com/questions/4488338/webview-android-proxy requestQueue null Log.e ProxyManager.class.getName Request queue is null return false Field proxyHostField null try Class requestQueueClass..
Example: Android bi-directional network socket using AsyncTask http://stackoverflow.com/questions/5135438/example-android-bi-directional-network-socket-using-asynctask via wait . On button press SendDataToNetwork adds data to queue and wakes up the background thread via notify . When background..
Handler vs AsyncTask vs Thread http://stackoverflow.com/questions/6964011/handler-vs-asynctask-vs-thread at first.Just understand that each thread has each message queue. like a To do List and thread will take each message and do.. and thread will take each message and do it until message queue emty. Ah maybe like you finish your work and go to bed . So..
ViewPager as a circular queue / wrapping http://stackoverflow.com/questions/7546224/viewpager-as-a-circular-queue-wrapping as a circular queue wrapping I am using a ViewPager with the FragmentStatePagerAdapter.. show Fragment C i.e. for it to behave as a circular queue and allow ... C A B C A ... I do not want the Fragments duplicated..
Android Activity Life Cycle - What are all these methods for? http://stackoverflow.com/questions/8515936/android-activity-life-cycle-what-are-all-these-methods-for onDestroy Activity States The Android OS uses a priority queue to assist in managing activities running on the device. Based..
android using flood fill algorithm getting out of memory exception http://stackoverflow.com/questions/12669740/android-using-flood-fill-algorithm-getting-out-of-memory-exception int replacement replacementColor if target replacement Queue Point queue new LinkedList Point do int x node.x int y node.y.. int replacement replacementColor if target replacement Queue Point queue new LinkedList Point do int x node.x int y node.y..
AsyncTask's get() method: Is there any scenario where it is actually the best option? http://stackoverflow.com/questions/16912768/asynctasks-get-method-is-there-any-scenario-where-it-is-actually-the-best-op MyAsyncTaskParameters static class MyAsyncTaskResults Queue MyAsyncTask queue task queue for post processing of AsyncTasks.. savedInstanceState queue new ConcurrentLinkedQueue MyAsyncTask b_thread new BackgroundThread queue b_thread.Start.. post processing of AsyncTask results in background private Queue MyAsyncTask queue private Thread thisthread public boolean continue_running..
How to use flood fill algorithm in Android? http://stackoverflow.com/questions/16968412/how-to-use-flood-fill-algorithm-in-android Bitmap bmp Point pt int targetColor int replacementColor Queue Point q new LinkedList Point q.add pt while q.size 0 Point n.. int replacement replacementColor if target replacement Queue Point queue new LinkedList Point do int x node.x int y node.y..
How to execute web request in its own thread? http://stackoverflow.com/questions/2022170/how-to-execute-web-request-in-its-own-thread then pass the data to GUI public class ServerConnection Queue String requests ... DefaultHttpClient httpClient HttpHost targetHost..
Running multiple AsyncTasks at the same time — not possible? http://stackoverflow.com/questions/4068984/running-multiple-asynctasks-at-the-same-time-not-possible a fixed size queue internally for storing delayed tasks. Queue size is 10 by default. If you start 15 your custom tasks in..
A grid layout of icon/text buttons http://stackoverflow.com/questions/5046320/a-grid-layout-of-icon-text-buttons android layout_height wrap_content TextView android text Queue Management android gravity right android padding 3dip android..
Example: Android bi-directional network socket using AsyncTask http://stackoverflow.com/questions/5135438/example-android-bi-directional-network-socket-using-asynctask old data is still being sent you should have synchronized Queue inside NetworkTask. Then Background thread sets up the socket.. it closes connections and exits. If not it reads data from Queue sends it to network and goes back to sleep. You should have..
Android crash when app is closed and reopened http://stackoverflow.com/questions/5318847/android-crash-when-app-is-closed-and-reopened 03 15 15 36 08.645 ERROR KINETO 1370 KLOG0C3 xmk_QueryOSQueue SDL Queue empty WAIT_FOREVER android crash share improve.. 36 08.645 ERROR KINETO 1370 KLOG0C3 xmk_QueryOSQueue SDL Queue empty WAIT_FOREVER android crash share improve this question..
Android: Help in adapting ListView adapter with an ImageLoader Class (LazyList) http://stackoverflow.com/questions/5867894/android-help-in-adapting-listview-adapter-with-an-imageloader-class-lazylist old tasks in the queue. We need to discard them. photosQueue.Clean imageView PhotoToLoad p new PhotoToLoad url imageView.. p new PhotoToLoad url imageView synchronized photosQueue.photosToLoad photosQueue.photosToLoad.push p photosQueue.photosToLoad.notifyAll.. url imageView synchronized photosQueue.photosToLoad photosQueue.photosToLoad.push p photosQueue.photosToLoad.notifyAll start..
How to handle Handler messages when activity/fragment is paused http://stackoverflow.com/questions/8040280/how-to-handle-handler-messages-when-activity-fragment-is-paused abstract class PauseHandler extends Handler Message Queue Buffer final Vector Message messageQueueBuffer new Vector Message.. Handler Message Queue Buffer final Vector Message messageQueueBuffer new Vector Message Flag indicating the pause state private.. handler final public void resume paused false while messageQueueBuffer.size 0 final Message msg messageQueueBuffer.elementAt..
http://stackoverflow.com/questions/8070401/android-flood-fill-algorithm Bitmap bmp Point pt int targetColor int replacementColor Queue Point q new LinkedList Point q.add pt while q.size 0 Point n..
Fill the complete canvas but keep the bound fill area as it is like circle, rectangle http://stackoverflow.com/questions/8723590/fill-the-complete-canvas-but-keep-the-bound-fill-area-as-it-is-like-circle-rect int replacement replacementColor if target replacement Queue Point queue new LinkedList Point do int x node.x int y node.y..
how to fill color in image in particular area? http://stackoverflow.com/questions/8801047/how-to-fill-color-in-image-in-particular-area Bitmap bmp Point pt int targetColor int replacementColor Queue Point q new LinkedList Point q.add pt while q.size 0 Point n..
Simple Thread Management - Java - Android http://stackoverflow.com/questions/990948/simple-thread-management-java-android At the minute what I do is Manage Concurrent Tasks private Queue AsyncTask Bitmap Integer Integer tasks new LinkedList AsyncTask.. Caught RejectedExecutionException Exception Adding task to Queue tasks.add task Simply add the rejected task to a queue and the.. or go unbounded which is also possible with LinkedBlockingQueue and use your clone. Then perhaps submit the change as a patch..
This Handler class should be static or leaks might occur: IncomingHandler http://stackoverflow.com/questions/11407943/this-handler-class-should-be-static-or-leaks-might-occur-incominghandler to and read from. As messages contain target Handler as long as there are messages with target handler in the message queue the handler cannot be garbage collected. If handler is not static your Service or Activity cannot be garbage collected even.. even after being destroyed. This may lead to memory leaks for some time at least as long as the messages stay int the queue. This is not much of an issue unless you post long delayed messages. You can make IncomingHandler static and have a WeakReference..
http://stackoverflow.com/questions/15524280/service-vs-intent-service
How to run a Runnable thread in Android? http://stackoverflow.com/questions/1921514/how-to-run-a-runnable-thread-in-android thread.start You may consider your runnable object just as a command that can be sent to the message queue for execution and handler as just a helper object used to send that command. More details are here http developer.android.com..
AsyncTask won't stop even when the activity has destroyed http://stackoverflow.com/questions/2531336/asynctask-wont-stop-even-when-the-activity-has-destroyed
What is the Android UiThread (UI thread) http://stackoverflow.com/questions/3652560/what-is-the-android-uithread-ui-thread then the action is executed immediately. If the current thread is not the UI thread the action is posted to the event queue of the UI thread. Does the UI thread mean that this will be run everytime the activity is pushed the the background by some..
How can I update a single row in a ListView? http://stackoverflow.com/questions/3724874/how-can-i-update-a-single-row-in-a-listview displays news items. They contain an image a title and some text. The image is loaded in a separate thread with a queue and all and when the image is downloaded I now call notifyDataSetChanged on the list adapter to update the image. This works..
Running multiple AsyncTasks at the same time — not possible? http://stackoverflow.com/questions/4068984/running-multiple-asynctasks-at-the-same-time-not-possible on 2.2. Suppose you have a custom AsyncTask that just sleeps a second in doInBackground . AsyncTasks use a fixed size queue internally for storing delayed tasks. Queue size is 10 by default. If you start 15 your custom tasks in a row then first.. If you start 15 your custom tasks in a row then first 5 will enter their doInBackground but the rest will wait in a queue for a free worker thread. As soon as any of the first 5 finishes and thus releases a worker thread a task from the queue.. for a free worker thread. As soon as any of the first 5 finishes and thus releases a worker thread a task from the queue will start execution. So in this case at most 5 tasks will run simultaneously. However if you start 16 your custom tasks..
http://stackoverflow.com/questions/4488338/webview-android-proxy error getting field value return false if requestQueue null Log.e ProxyManager.class.getName Request queue is null return false Field proxyHostField null try Class requestQueueClass Class.forName android.net.http.RequestQueue proxyHostField..
Example: Android bi-directional network socket using AsyncTask http://stackoverflow.com/questions/5135438/example-android-bi-directional-network-socket-using-asynctask thread sets up the socket connection and then goes to sleep via wait . On button press SendDataToNetwork adds data to queue and wakes up the background thread via notify . When background thread wakes up it first checks the finish flag. If set..
Handler vs AsyncTask vs Thread http://stackoverflow.com/questions/6964011/handler-vs-asynctask-vs-thread with a thread's MessageQueue They may seem strange at first.Just understand that each thread has each message queue. like a To do List and thread will take each message and do it until message queue emty. Ah maybe like you finish your work.. that each thread has each message queue. like a To do List and thread will take each message and do it until message queue emty. Ah maybe like you finish your work and go to bed . So when Handler communicates it just gives a message to caller..
ViewPager as a circular queue / wrapping http://stackoverflow.com/questions/7546224/viewpager-as-a-circular-queue-wrapping as a circular queue wrapping I am using a ViewPager with the FragmentStatePagerAdapter to allow navigation between some fragments. Let's say.. to swipe from left to right on Fragment A and have the ViewPager show Fragment C i.e. for it to behave as a circular queue and allow ... C A B C A ... I do not want the Fragments duplicated in other positions i.e. ending up with more than three..
Android Activity Life Cycle - What are all these methods for? http://stackoverflow.com/questions/8515936/android-activity-life-cycle-what-are-all-these-methods-for the activity the events are called as below onPause onStop onDestroy Activity States The Android OS uses a priority queue to assist in managing activities running on the device. Based on the state a particular Android activity is in it will be..
android using flood fill algorithm getting out of memory exception http://stackoverflow.com/questions/12669740/android-using-flood-fill-algorithm-getting-out-of-memory-exception int height image.getHeight int target targetColor int replacement replacementColor if target replacement Queue Point queue new LinkedList Point do int x node.x int y node.y while x 0 image.getPixel x 1 y target x boolean spanUp.. int height image.getHeight int target targetColor int replacement replacementColor if target replacement Queue Point queue new LinkedList Point do int x node.x int y node.y while x 0 image.getPixel x 1 y target x boolean spanUp false..
AsyncTask's get() method: Is there any scenario where it is actually the best option? http://stackoverflow.com/questions/16912768/asynctasks-get-method-is-there-any-scenario-where-it-is-actually-the-best-op complete. public class MyActivity extends Activity static class MyAsyncTaskParameters static class MyAsyncTaskResults Queue MyAsyncTask queue task queue for post processing of AsyncTasks in the background BackgroundThread b_thread class related.. protected void onCreate Bundle savedInstanceState super.onCreate savedInstanceState queue new ConcurrentLinkedQueue MyAsyncTask b_thread new BackgroundThread queue b_thread.Start void KickOffAsynctask MyAsyncTaskParameters params MyAsyncTask.. implements Runnable class that controls the post processing of AsyncTask results in background private Queue MyAsyncTask queue private Thread thisthread public boolean continue_running public BackgroundThread Queue MyAsyncTask queue..
How to use flood fill algorithm in Android? http://stackoverflow.com/questions/16968412/how-to-use-flood-fill-algorithm-in-android my simple app. The code I've found private void FloodFill Bitmap bmp Point pt int targetColor int replacementColor Queue Point q new LinkedList Point q.add pt while q.size 0 Point n q.poll if bmp.getPixel n.x n.y targetColor continue Point w.. int height image.getHeight int target targetColor int replacement replacementColor if target replacement Queue Point queue new LinkedList Point do int x node.x int y node.y while x 0 image.getPixel x 1 y target x boolean spanUp false..
How to execute web request in its own thread? http://stackoverflow.com/questions/2022170/how-to-execute-web-request-in-its-own-thread to post requests and handle responses in its own thread and then pass the data to GUI public class ServerConnection Queue String requests ... DefaultHttpClient httpClient HttpHost targetHost Handler handler ServerResponseHandler responseHandler..
Running multiple AsyncTasks at the same time — not possible? http://stackoverflow.com/questions/4068984/running-multiple-asynctasks-at-the-same-time-not-possible that just sleeps a second in doInBackground . AsyncTasks use a fixed size queue internally for storing delayed tasks. Queue size is 10 by default. If you start 15 your custom tasks in a row then first 5 will enter their doInBackground but the rest..
A grid layout of icon/text buttons http://stackoverflow.com/questions/5046320/a-grid-layout-of-icon-text-buttons src @drawable ftnicon android layout_width wrap_content android layout_height wrap_content TextView android text Queue Management android gravity right android padding 3dip android textColor #ffffff LinearLayout TableRow TableRow TextView..
Example: Android bi-directional network socket using AsyncTask http://stackoverflow.com/questions/5135438/example-android-bi-directional-network-socket-using-asynctask that user can press button multiple times while the old data is still being sent you should have synchronized Queue inside NetworkTask. Then Background thread sets up the socket connection and then goes to sleep via wait . On button press.. thread wakes up it first checks the finish flag. If set it closes connections and exits. If not it reads data from Queue sends it to network and goes back to sleep. You should have finish method which sets a finish flag atomic variable like..
Android crash when app is closed and reopened http://stackoverflow.com/questions/5318847/android-crash-when-app-is-closed-and-reopened endDrag false 03 15 15 36 06.549 DEBUG Launcher 1371 onResume 03 15 15 36 08.645 ERROR KINETO 1370 KLOG0C3 xmk_QueryOSQueue SDL Queue empty WAIT_FOREVER android crash share improve this question I've answered a question like this here . The.. 03 15 15 36 06.549 DEBUG Launcher 1371 onResume 03 15 15 36 08.645 ERROR KINETO 1370 KLOG0C3 xmk_QueryOSQueue SDL Queue empty WAIT_FOREVER android crash share improve this question I've answered a question like this here . The error you're..
Android: Help in adapting ListView adapter with an ImageLoader Class (LazyList) http://stackoverflow.com/questions/5867894/android-help-in-adapting-listview-adapter-with-an-imageloader-class-lazylist may be used for other images before. So there may be some old tasks in the queue. We need to discard them. photosQueue.Clean imageView PhotoToLoad p new PhotoToLoad url imageView synchronized photosQueue.photosToLoad photosQueue.photosToLoad.push.. We need to discard them. photosQueue.Clean imageView PhotoToLoad p new PhotoToLoad url imageView synchronized photosQueue.photosToLoad photosQueue.photosToLoad.push p photosQueue.photosToLoad.notifyAll start thread if it's not started yet if.. photosQueue.Clean imageView PhotoToLoad p new PhotoToLoad url imageView synchronized photosQueue.photosToLoad photosQueue.photosToLoad.push p photosQueue.photosToLoad.notifyAll start thread if it's not started yet if photoLoaderThread.getState..
How to handle Handler messages when activity/fragment is paused http://stackoverflow.com/questions/8040280/how-to-handle-handler-messages-when-activity-fragment-is-paused when the activity is paused i.e. in the background. public abstract class PauseHandler extends Handler Message Queue Buffer final Vector Message messageQueueBuffer new Vector Message Flag indicating the pause state private boolean paused.. the background. public abstract class PauseHandler extends Handler Message Queue Buffer final Vector Message messageQueueBuffer new Vector Message Flag indicating the pause state private boolean paused Resume the handler final public void resume.. the pause state private boolean paused Resume the handler final public void resume paused false while messageQueueBuffer.size 0 final Message msg messageQueueBuffer.elementAt 0 messageQueueBuffer.removeElementAt 0 sendMessage msg Pause..
http://stackoverflow.com/questions/8070401/android-flood-fill-algorithm this algorithm worked good for me. private void FloodFill Bitmap bmp Point pt int targetColor int replacementColor Queue Point q new LinkedList Point q.add pt while q.size 0 Point n q.poll if bmp.getPixel n.x n.y targetColor continue Point w..
Fill the complete canvas but keep the bound fill area as it is like circle, rectangle http://stackoverflow.com/questions/8723590/fill-the-complete-canvas-but-keep-the-bound-fill-area-as-it-is-like-circle-rect int height image.getHeight int target targetColor int replacement replacementColor if target replacement Queue Point queue new LinkedList Point do int x node.x int y node.y while x 0 image.getPixel x 1 y target x boolean spanUp false..
how to fill color in image in particular area? http://stackoverflow.com/questions/8801047/how-to-fill-color-in-image-in-particular-area Solution with Flood fill algoritham private void FloodFill Bitmap bmp Point pt int targetColor int replacementColor Queue Point q new LinkedList Point q.add pt while q.size 0 Point n q.poll if bmp.getPixel n.x n.y targetColor continue Point w..
Simple Thread Management - Java - Android http://stackoverflow.com/questions/990948/simple-thread-management-java-android 9 the thread manager throws a RejectedExecutionException . At the minute what I do is Manage Concurrent Tasks private Queue AsyncTask Bitmap Integer Integer tasks new LinkedList AsyncTask Bitmap Integer Integer @Override public int remainingSize.. catch RejectedExecutionException r Log.i TAG Caught RejectedExecutionException Exception Adding task to Queue tasks.add task Simply add the rejected task to a queue and the next time a thread is started the queue is checked to see.. possibility is for you to clone AsyncTask raise the limit or go unbounded which is also possible with LinkedBlockingQueue and use your clone. Then perhaps submit the change as a patch to AsyncTask for future Android releases. Click here to run..
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