Android looper prepare error code

This might not be the perfect solution but one of my favorite from framework. Message is a command with data which. Prepares a looper associated with the calling thread, and returns it. If the thread already has a looper, it is returned. Otherwise, a new one is created, associated with the thread, and returned. I use handler and message in showMsg( ), why it show " Can' t create handler inside thread that has not called Looper. prepare( ) " in logcat. GitHub is home to over 28 million developers working together to host and review code, manage projects, and build software together. has not called Looper. I am trying to develop an application with Android 1. 5( cupcake_ r1) for a week but always get an error reported in prepare of MediaRecorder. If you TellTheDetails ( that' s link) of what happened when you tried to put Looper. prepare( ) before the while loop, you may get a better response. I' ve moved this to the Android forum.

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  • Video:Prepare error looper

    Prepare code error

    All things are lawful, but not all things are profitable. android error: Can' t create handler inside thread that has not called Looper. prepare( ) 16 Can' t create handler inside thread that has not called Looper. Need to use android. Get the best Java code examples selected from millions of open source projects. This is an important reason why HandlerThread should be used over manual setup with Looper. prepare( ), Looper. The HandlerThread. onLooperPrepared( ) method can be used to execute some sort of setup before the Looper loops, like creating a Handler that will be associated with the HandlerThread. In this article we are going to explore reason behind the above exception and try to understand how Looper works in Android. At the end, I am going to explain one approach to run Toast from a worker thread, but before that we need to understand how Looper works.

    First we will call Looper. prepare( ) to make this Thread act as pipeline. Next new Handler( ) will be called to handle message queue on this thread. loop( ) will be called to start running the message loop. The following are top voted examples for showing how to use android. These examples are extracted from open source projects. You can vote up the examples you like and your votes will be used in our system to generate more good examples. Android: Looper, Handler, HandlerThread. 11 October on android, thread, looper. What do you know about threads in Android? You may say " I' ve used AsyncTask to run tasks in background".

    Looper Class used to run a message loop for a thread. Threads by default do not have a message loop associated with them; to create one, call prepare( ) in the thread that is to run the loop, and then loop( ) to have it process messages until the loop is stopped. Home » Android » Can' t create handler inside thread that has not called Looper. prepare( ) Can' t create handler inside thread that has not called Looper. prepare( ) Posted by: admin November 4, Leave a comment. Causes the handler thread' s looper to terminate without processing any more messages in the message queue. Any attempt to post messages to the queue after the looper is asked to quit will fail. For example, the Handler. sendMessage( Message) method will return false. Join GitHub today. The following are Jave code examples for showing how to use quit( ) of the android. You can vote up the examples you like. Your votes will be used in our system to get more good examples.

    Although adding Looper. prepare( ) is probably a valid option, I' d rather add use Activity# runOnUIThread if thats possible here. Also, why are you using a thread anyway? As for the " Can' t create handler inside that has not called Looper. prepare( ) ", is due to the fact that Unity doesn' t run in a proper Android Looper ( and you can' t force it, without stalling the whole app. ), but employs it' s own. This post is a wiki. Anyone with karma > 75 is welcome to improve it. 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. Public constructors; Handler( ). Default constructor associates this handler with the Looper for the current thread. Handler( Handler.

    Callback callback). Constructor associates this handler with the Looper for the current thread and takes a callback interface in which you can handle messages. Join Stack Overflow to learn, share knowledge, and build your career. Hi Guys I am from Delhi working as Web/ Mobile Application Developer( Android Developer), also have knowledge of Roboelctric and Mockito, android test driven development. How To Create Child Thread’ s Message Queue And Looper. However, the worker thread created by default has no message queue and message looper, If you want the worker thread to have a message queue and message looper, you can follow below steps. Today I’ d like to give a short introduction to two nice classes – Looper and Handler. They are used in Android UI internally, and available to us developers so we can do some cool things with their help. A looper is the state tracking an event loop for a thread. Loopers do not define event structures or other such things; rather they are a lower- level facility to attach one or more discrete objects listening for an event. Hello, I am trying to run some code not in the main activity involving controls on Main. I tried this from secondary class: [ code] final MainActivity Can' t create handler inside thread that has not called Looper. prepare( ) ( Android forum at Coderanch).

    This is my first app and the sample code that I based my app on had this code running on the main activity. I realized that I needed my app to run as a service. So I just moved the main activity code to the service. The following are Jave code examples for showing how to use loop( ) of the android. 8) For those who get the same exception message from different code: What the exception message means is that you are calling the code via a thread that has not prepared Looper. Java Code Examples for android. The following code examples are extracted from open source projects. You can click to vote up the examples that are useful to you. But before we start, let’ s discuss the Pipeline Thread for some more time and see how Looper and Handler implement it. Usages of the Pipeline Thread. The most prominent usage of Pipeline Thread is found within almost any UI framework, including Swing ( remember the event- dispatching thread? ), SWT, Adobe Flex and, of course, Android Activities.