1. 解释出现"can't create handler inside thread that has not called looper.prepare"错误的原因 在Android中,Handler通常与主线程(UI线程)的Looper相关联,用于处理消息和Runnable对象。然而,当你在一个新的线程中尝试创建一个Handler而没有在该线程中调用Looper.prepare()时,就会遇到这个错误。Looper.prepare()用...
Handler是这么定义的: 主要接受子线程发送的数据, 并用此数据配合主线程更新UI. Handler的主要作用:主要用于异步消息的处理 Handler的执行过程: 当(子线程)发消息后,。首先,进入一个(主线程)消息队列,函数来发送消息立即返回,在主线程Handler一个在新闻删除消息队列中的一个,然后处理该消息。这样就实现了跨线程UI更...
每个Handler对象都会绑定一个Looper对象,每个Looper对象对应一个消息队列(MessageQueue)。如果在创建Handler时不指定与其绑定的Looper对象,系统默认会将当前线程的Looper绑定到该Handler上。 在主线程中,可以直接使用new Handler()创建Handler对象,其将自动与主线程的Looper对象绑定;在非主线程中直接这样创建Handler则会报错,...
报Can't create handler inside thread that has not called Looper.prepare() 在新线程中添加“Looper.prepare();” 解决问题。。 但是不明白为什么 没详细看 有时间看看 http:///kaifafaq/420.html 下面是一些讨论: 朋友,我重现了你的问题,当我使用java.lang.Thread重现了你这个问题, log也是这个,原因很简单...
1、报错内容:Only the original thread that created a view hierarchy can touch its views.Only the original thread that created a view hierarchy can touch its views. 2、问题分析:在Android中不允许Activity里新启动的线程访问该Activity里的UI组件,Android中的UI是线程不安全的, 所有的更新UI操作都必须要在...
【摘要】 一、前言原子线程调用Toast报Can't create handler inside thread that has not called Looper.prepare() 错误今天用子线程调Toast报了一个Can't create handler inside thread that has not calledLooper.prepare()错误。因为toast的实现需要在acti... ...
(TAG, "The following Handler class should be static or leaks might occur: " + klass.getCanonicalName()); } } mLooper = Looper.myLooper(); if (mLooper == null) { throw new RuntimeException( "Can't create handler inside thread " + Thread.currentThread() + " that has not called ...
at java.lang.Thread.run(Thread.java:764) Caused by: java.lang.RuntimeException: Can't create handler inside thread Thread[AsyncTask #2,5,main] that has not called Looper.prepare() at android.os.Handler.(Handler.java:205) at android.os.Handler.(Handler.java:118) at com.nutomic.syncthing...
though not necessarily immediately after the completion of this callback. If the activity was resumed, it will be paused and new intent will be delivered, followed by#onResume. If the activity wasn't in the resumed state, then new intent can be delivered immediately, with#onResume()called ...
Called when a generic motion event was not handled by any of the views inside of the activity. C# コピー [Android.Runtime.Register("onGenericMotionEvent", "(Landroid/view/MotionEvent;)Z", "GetOnGenericMotionEvent_Landroid_view_MotionEvent_Handler")] public virtual bool OnGenericMotionEvent (...