Android :: Java Thread Message Passing
Jun 16, 2010
I'm writing an Android app. I have a main method, which creates and runs a new Thread using an anonymous inner Runnable class. The run() method, when it's done, calls a method on it's parent class (in the main thread) that calls notifyDataSetChanged() so that the main thread can redraw the new data. This is causing all kinds of trouble (ViewRoot$CalledFromWrongThreadException). The thing is, this method being called from the worker thread is on the class that's created in the UI thread. Shouldn't that be running on the UI thread? Or am I missing something.
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Mar 5, 2010
I have a simple app and I'm using the AsyncTask to test out a background process, for clearness purposes I've opted to put my AsyncTask in a separate class rather than in an inner class, which where my problems begin, this is my AsyncTask. Code...
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Sep 7, 2010
How can I implement a run() method of thread if I create a Thread Global?
I mean If I create a Thread Globally then can I implement its run() method {" public void run()"} anywhere in my Application?
In the run() method I have to write the code to perform some action.
IF I can do it then please can anyone show me briefly how to do it particularly.
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Oct 13, 2010
In Handler, we can pass some data from a background thread to the UI thread like this:
private void someBackgroundThreadOperation() {
final String data = "hello";
handler.post(new Runnable() {
public void run() {
Log.d(TAG, "Message from bg thread: " + data);
}
}
}
If we use the above, we cannot then use Handler.removeCallbacks(Runnable r), because we won't have references to any of the anonymous runnables we created above. We could create a single Runnable instance, and post that to the handler, but it won't allow us to pass any data through:.............
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Jul 23, 2010
I have two activities:
"a" that spawns thread for generating a dynamic array of values inside public void run() function.
"b", graphics activity that will help me draw rectangular pulses based on array values calculated in activity "a" (calculated in a's thread to be precise).
When I am in thread inside "a", how do I pass values of array to activity "b" and
call activity as well.
activity A
CODE:..........
activity B
CODE:..............
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Jun 25, 2010
I'm writing some stuff in java and i ran into some problems lately. cut short, i need to compare an object i created to another instance of this very class i instantiazed before with different data.
looks like this:
CODE:........
with a class a:
CODE:..........
The problem is, that i end up finding out that the values from newA are always equal to those from oldA. so i guess sth went wrong with passing the references of the objects in the last line of the loop...i thought java always passes references of objects unless an explicit copy() is called? if this does matter: this code is running on android - don't know if the dalvik vm messes aroung with this...
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Sep 29, 2010
I thought when you passed objects to methods in Java, they were supposed to be by value.
public class MyClass{
int mRows;
int mCols;
Tile mTiles[][]; //Custom class
//Constructor
public MyClass(Tile[][] tiles, int rows, int cols) {..........
At this point, any changes to the mTiles object are reflected back to the tiles object.
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Apr 25, 2010
I am trying to communicate between two Android applications. Application-A will send message/data to Application-B. After receiving message from Application-A, Application-B will send a reply message to Application-A. Is it possible in Android application? If yes please point me the APIs that can be used to achieve this.
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Jun 23, 2010
I am trying to display a dialog box in a simple Java class that is called from my main Activity but not successful. Please help me to figure it out.
I am passing the required values as parametrs.
I have two class: class MainActivity extends Activity :: Main *starting point *of Application class ShowMyDialog :: a simple java program In which I *generate an URl* and *display a dialog with WebView*.
I am passing the Acitivity from my MainActivity to this class as a parameter in function.
But I am *unable to call* the onCreateDialog method that I have *defined in the simple java class.
However, If I define the *onCreateDialog method in MainActivity, I am able to display it successfully.
What Should I pass as Parameter to the non Activity class from MainActivity class so that I am able to display the dialog as defined by showdialog method in JAVA class ???*
My steps of source code is as follow:
code:.........................
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May 8, 2010
Does anyone know how Java thread relates to Android native thread? Does it map one to one?
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May 10, 2010
I have a multithreaded streaming app which has mainly the following 5 threads. 1 Main App(UI) Thread 1 controller thread (in native) 1 audio decoder thread (in native) 1 video decoder thread(in native) 1 thread to query the head position of audio (in Java) Apart from this I have video rendering with OpenGL. My problem is, if I query the thread priority using the Thread.getPriority method (my native threads make callbacks to Java and I am making the query at that point of time), I am getting the priority of each of them as 5. For my audio query thread (the last one in the list) I am explicitly setting the priority using Process.setThreadPriority(Process.THREAD_PRIORITY_URGENT_AUDIO); Also for my decoder threads, I am giving higher priority than my controller thread(using pthread APIs in native). But still finally all of them seem to have same priority. Also what should I be doing to increase the priority of my threads(both from Java and native)?
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Aug 4, 2010
We have a service that seem to get deadlocked very occasionally in the field. It's not possible to hook up to a debugger. We can detect the deadlock situation programmatically. Is it possible to do this from within Java code?
if (ohIamDeadlocked()) { Thread.something.dumpStacksOfAllThreads(); }
If this is not possible, is there an adb command that could do it? I tried "adb dumpsys" but it doesn't print any stack information.
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Jun 24, 2010
Suppose i have one simple function in my program. Whenever i call that function does a new thread or process is spawned to execute the function or it is executed under the main thread memory space only.
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Jun 3, 2010
Sometimes when I receive messages it makes the notification sound and will show message in notification bar but the text of the message will not appear in the text thread. Used to happen every once in a while, now doing it multiple times a day. I use Handcent but I doubt that is the problem because the messages dont show up in the regular messaging either. Just want to see if i am alone with this problem.
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Sep 9, 2010
Is there a reason why the Thread class in the SDK LunarLander and JetBoy examples are not each in a separate java file, rather than being inside the View file?
It would make things a bit clearer, IMHO. Am I missing something?
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Aug 4, 2010
Not sure if this is a common problem, but essentially, in the bundled 'Messages' application for the HTC Legend, the text messages are saved as a thread as standard. But today, for some bizarre reason, when I open a message thread, it opens at the oldest message, whereas before, it would open at the most recent message. I've looked around in the settings, turned my phone on and off, cleared the data, but still can't get it to revert, it's quite annoying to scroll through hundreds of messages to get to the most recent SMS.
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Sep 21, 2010
I am using RunningTaskInfo.topActivity.getClassName() to determine the class name of the activity being viewed by the user. If the top activity is an sms message (the user is texting) then I want to determine either the thread id of the open message or the contact name/ number, either will work! I am able to determine if a message is open by comparing the class name.unningTaskInfo.topActivity.getClassName().equals("com.android.mms.ui.ComposeMessageActivity") which returns true/false. When it is true I need to get the above information from this "compose message". Any ideas on how I can get this kind of information from an Android OS activity (an sms message)?
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Sep 24, 2009
is there an app to copy a complete text thread and email?
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Nov 17, 2010
My application launches a thread to query the web for some data. I want to display a Toast message when nothing is found, but my application always crashes. I've tried using the application Context from within the thread, like so: Toast.makeText(getApplicationContext(), "testttt", Toast.LENGTH_LONG).show(); I've also tried creating a Runnable with the Toast call and calling runOnUiThread(runnable) from the Thread (the Toast call in this runnable uses the Activity as the first parameter). Does anyone have any ideas on how to accomplish this?
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Oct 7, 2010
I am queuing up a bunch of runnables into a thread via a Handler.post(). I would like the ability to send a note to that thread that it should pause. By pause I mean, finish the runnable or message you are currently working on, but don't go to the next message or runnable in your message queue until I tell you to continue.
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Apr 19, 2010
I have a problem handling messages in a Thread. My run-method looks like this The problem is that the run-method logs "id from message: null" though "message ID" has a value in the Log-statement. Why does the message "lose" it's data when being send to the thread? Has it something to do with the notify?
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Feb 18, 2010
I have an app with a two threads - main and data loader. When data loader finishes it posts a Runnable object to the main thread (as described in the DevGuide), but it never gets delivered and run. Here's the basic code:
class MyApp extends Application{
public void onCreate()
{LoaderThread t = new LoaderThread();
t.start(); }
private class LoaderThread extends Thread {
public void run()
{ SystemClock.sleep(2000);
boolean res = m_handler.post(m_runnable);
if(res)
Log.d(TAG, "Posted Runnable"); } ............
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Mar 30, 2010
I'm writing unit tests for a ListActivity in Android that uses a handler to update a ListAdapter. While my activity works in the Android emulator, running the same code in a unit test doesn't update my adapter: calls to sendEmptyMessage do not call handleMessage in my activity's Handler. How do I get my ActivityUnitTestCase to sync with the MessageQueue thread and call my Handler?
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Sep 4, 2010
I am using an Executor [fixed thread pool] with my own ThreadFactory that adds a Looper:
CODE:...............
I am running a thread that makes network requests but if the network fails I would like a dialog message to be displayed to the user. This process is rather involving since it requires making AND displaying the request in the UI thread. I can wait for the user's response to the dialog by simply adding a Loop to the network thread and wait for a message to be send from the UI thread. This allows me to encapsulate the network requests in a while(tryAgain) thread. All works well except when the Looper.loop() method is called the second time (after a second network error dialog is displayed) and a message is sent by the dialog (in the UI thread) to the network thread's handler:
CODE:.............
In the AlertDialog instance is an OnClickListener:
CODE:...............
I've checked that the thread is still active with handler.getLooper().getThread().isAlive() which always returns true but it still gives me "sending message to a Handler on a dead thread". How is it that the Message/Handler has decided that the thread is dead? Shouldn't it rely on the .isAlive() method? In the end I am trying to avoid replicating the thread management build into the Android OS .
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Sep 29, 2010
I have a thread in java/Android like this:
CODE:................
The thread works fine when I run my application. But I want to start/restart the thread with a button.
CODE:.........
If I copy the thread into the button I just make a new thread every time the user clicks on the button. I want to run the thread when the user first time click on the button, "kill it" and start from the beginning if the user click on the button a second time.
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Sep 30, 2010
Am currently running the deFrost FroYo ROM. Everything's fantastic, except...whenever I'm viewing a text message thread, it's slow to scroll through previous messages. Frustratingly slow. Is this a common issue with the deFrost ROM? Or is there something I can change / configure to resolve this?
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Nov 29, 2009
I need to have each individual message show up in its own thread not connected to others from same sender. I get fire department texts that need to be read and replied to in non thread format. Otherwise I will be responding to the entire group of messages that could be sent from different users using the same name.
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Jul 16, 2010
its 2000+ messages, slows the whole damn phone down, esp handcent and the other msg app. when i try to delete it takes forever and just freezes the phone
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Dec 19, 2009
My text thread with my girlfriend is over 4000 messages long, causing significantly noticeable lag-time. I've tried to delete the entire thread with her, but it just freezes up the program and I have to force quit it, and it won't delete the thread. Is there any way to erase all text messages at once, preferably from outside the program?
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Dec 2, 2012
I'm in the need of viewing the entire conversation between me and a friend, but since we've sent so many text to each other, I can only scroll up to a certain point, therefore i can't see a lot of messages . What can I do?
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