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Questions tagged [android-handlerthread]

Handler is part of the Android system's framework for managing threads. A Handler object receives messages and runs code to handle the messages. Normally, you create a Handler for a new thread, but you can also create a Handler that's connected to an existing thread. When you connect a Handler to your UI thread, the code that handles messages runs on the UI thread. This way results of background work can be moved to UI elements such as bitmaps.

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Example communicating with HandlerThread

I want to set up a HandlerThread from the GUI thread. Then some time later, when a button is clicked on the GUI, it runs callHello(), which then send a message to a HelloLogger object residing on the non-GUI thread which asynchronously logs "Hello…
Jodes
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Why use HandlerThread in Android

In android , Handler can be used to post / handle message, if I don't use a HandlerThread (pass its Looper to Handler), does that mean in this case Handler use MainThread (UI Thread) 's Looper ? What result will get if Handler uses MainThread's…
Daniel
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"Long monitor contention with owner" warning

I get this warning message and since I see this message I also started to see the Google Play Services isnt responding popup and it closes my application after some time. I have review similar questions but could not find out the reason. Following…
Hilal
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HandlerThread vs IntentService

I would like to ask someone to explain me please, what are the main differences between HandlerThread and IntentService, and what are the main use-case scenarios? I understand that HandlerThread contains a Looper, which managing the messageQueue,…
narancs
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Handler or Launching a Coroutine Job to do something in the MainThread

I've been wondering about whether it is a better approach to use a Handler (Looper.getMainLooper()) or launch a new Coroutine Job to do small things on the Main Thread, like updating a View. Handler: val uiHandler =…
Augusto Carmo
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Completion Handlers in Android

I am an iOS developer who just recently tried Android development. In iOS I use Completion Handlers in my codes. I am wondering if there is an equivalent of it in Android development? Thank you
JayVDiyk
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NullPointerException in HandlerThread

This bug baffled me for hours. I am getting the NullPointerException. The problem is this error is not consistent. It happens when I launch the app, but only occasionally. So I am not sure what is causing it. I apologize for the verbose question…
Greeso
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Android Handler Not Receiving Message Using HandlerThread

Ia m Using HandlerThread and Handler in my below code, Actually I try to update the data from runnable to Handler callback. In every loop the sendMessage() function Called but I didn't received nothhing in Callback. What I am missing? public class…
appukrb
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Why does Handler that have set a looper of HandlerThread can interact with UI Objects?

why this code works? @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); Log.i("onCreate", Thread.currentThread().toString()); textView =…
kittenforcode
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HandlerThread blocks UI android

I am working on a modification of Google's Camera2 API example for Android, found here: https://github.com/googlesamples/android-Camera2Basic I am uploading captured images to Cloudinary, and obviously need to do so in a background thread so the UI…
Jeff Fennell
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handler.post(runnable) run in child thread ,but why it can update ui thread?

this is my code HandlerThread handlerThread = new HandlerThread("test"); handlerThread.start(); Handler handler_test = new Handler(handlerThread.getLooper()); handler_test.post(()->{ Log.d("handlerr_test",…
zadaji
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Android MessageQueue in Handler sent with unexpected latency

I created an architecture with a process A communicating to another process B through IPC. A runs a sticky service. B runs a sticky service. This A service binds to the B service. When bind succeeds, for requests from A to B, A creates…
Seynorth
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Calling a method in Custom View from a HandlerThread

Hi all I am a beginner in android programming and I am having a little trouble trying to understand how HandlerThread works. Specifically, I am not sure if the method in the custom view class is executed in the background thread (or non-UI thread)…
f00l
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Android HandlerThread: Handler post doesn't run Runnable sometimes

I am experimenting with HandlerThread on Android, and I can't seem to explain a strange behavior. Here is a class I am using to simply log a message through this unique thread. public class HandlerLogger { MyHandler mHandler; HandlerThread…
Raphael C
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Why creating HandlerThread for one purpose : to pass it's Looper to a new Handler

I see a lot examples in code were we see the next thing: HandlerThread thread = new HandlerThread("Thread1"); thread.start(); mLoadHandler = new Handler(thread.getLooper()) mLoadHandler.post(new Runnable() { public…
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