Can't create handler inside thread that has not called Looper.prepare()

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在子线程中new Handler报错--Can't create handler inside thread that has not called Looper.prepare()

在子线程中new一个Handler为什么会报以下错误? java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 这是因为Handler对象与其调用者在同一线程中,如果在Handler中设置了延时操作,则调用线程也会堵塞.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Ha…

Android 线程更新UI报错 : Can't create handler inside thread that has not called Looper.prepare()

MainActivity中有一个按钮,绑定了save方法 public void save(View view) { String title = titleText.getText().toString(); String timelength = lengthText.getText().toString(); ExecutorService exec = Executors.newCachedThreadPool(); exec.execute(new NewsService(getApp…

关于子线程使用Toast报错Can't create handler inside thread that has not called Looper.prepare()的解决办法

形同如下代码,在Thread中调用Toast显示错误信息: new Thread(new Runnable(){ @Override public void run() { try{ weatherData = getWeatherData(strUrl); parseJson(weatherData); }catch(Exception e){ Toast.makeText(WindowApplication.getAppContext(), e.toString(), Toast.LENGT…

Can’t create handler inside thread that has not called Looper.prepare()

1)在Android 2.3以前,为防止ANR(Application Not Responding),Google是不赞成将网络连接等一系列耗时操作直接放到应用主线程进行的,推荐将这类操作放在子线程内:而Android 4.0版本开始,Google强制要求这类操作必须在子线程内进行,否则将抛出 NetworkOnMainThreadException 异常. (2)操作UI必须只能在主线程内进行,否则报“Can’t create handler inside thread that has n…

Android-java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare()

章出自:luchg技术交流 http://www.luchg.com 版权所有.本站文章除注明出处外,皆为作者原创文章,可自由引用,但请注明来源,谢谢. Android-java.lang.RuntimeException: Can't create handler inside thread that has not called Looper.prepare() 当我们在一个新的线程中使用android UI时,遇到这个异常看了很多文章也还是不太清楚具体是什么原因,但是处理这个问题是很简单…

Android handler 报错处理Can't create handler inside thread that has not called Looper.prepare()

问题: 写了一个sdk给其他人用,提供一个回调函数,函数使用了handler处理消息 // handler监听网络请求,完成后操作回调函数 final Handler trigerGfHandler = new Handler() { public void handleMessage(Message msg) { listener.onGeofenceTrigger(gfMatchIds); } }; 在使用这个sdk提供的函数时,报错: 01-02 15:46:10.498: E/Andro…

Android进阶(八)Can't create handler inside thread that has not called Looper.prepare()

Error:Can't create handler inside thread that has not called Looper.prepare() 原代码: //利用Handler消息传递机制 final Handler myHandler = new Handler(MainActivity.this.getMainLooper()){ @Override public void handleMessage(Message msg) { super.handleMessage(msg)…