不能与处理程序解决CalledFromWrongThreadException [英] Can't resolve CalledFromWrongThreadException with Handler

问题描述

我会尽量保持简单：

在我的主要活动我做一个处理程序：

 公共类ARViewer扩展ARDisplayActivity {    公众最终MHandler mHandler =新MHandler（本）; 公共无效的onCreate（捆绑savedInstanceState）{
...
 

类MHandler：

 公共最后一类MHandler扩展了Handler {        //主要活动
 私人ARViewer arnv;        公共MHandler（ARViewer arnv）{
  this.arnv = arnv;
 }        @覆盖
 公共无效的handleMessage（消息MSG）{
            ...
            案例H_RR：
                  arnv.setContentView（R.layout.routeplanner）;
                  打破;
            ...
  super.handleMessage（MSG）;
 }
}
 

但是，如果我把从在其他类的回调函数的handleMessage方法，肯定从其他线程，我仍然得到异常消息： CalledFromWrongThreadException（只有创建一个视图可以分层原来的线程触摸自己的看法）：

 公共无效rFound（路由路径）{
           消息味精=新的Message（）;
           msg.what = MHandler.H_RR;
           ARViewer.arnv.mHandler.handleMessage（MSG）;
}
 

解决方案

您不必参考活性那里。
创建新的可运行，你做你的UI的东西。而做mHandler.post（myUIRunnable）;
例子如下：
http://developer.android.com/guide/appendix/faq/commontasks html的＃线程

I will try to keep it simple:

In my main activity I make a handler:

public class ARViewer extends ARDisplayActivity {

    public final MHandler mHandler = new MHandler(this);

 public void onCreate(Bundle savedInstanceState) {
...

The class MHandler:

public final class MHandler extends Handler{

        //main activity
 private ARViewer arnv;

        public MHandler(ARViewer arnv){
  this.arnv = arnv;
 }

        @Override
 public void handleMessage(Message msg) {
            ...
            case H_RR :
                  arnv.setContentView(R.layout.routeplanner);    
                  break;
            ...
  super.handleMessage(msg);
 }
}

But if I call the handleMessage method from a callback function in a other Class, definitely from a other thread, I still get the exception message: CalledFromWrongThreadException (Only the original thread that created a view hierarchy can touch its views) :

public void rFound(Route route) {
           Message msg = new Message();
           msg.what = MHandler.H_RR;
           ARViewer.arnv.mHandler.handleMessage(msg);
}

解决方案

You don't need reference to activity there. Create new runnable where you doing your UI stuff. And do mHandler.post(myUIRunnable); Example is here: http://developer.android.com/guide/appendix/faq/commontasks.html#threading

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