无法创建内螺纹处理程序。我如何使用活套。prepare（）？ [英] Can't create handler inside thread. How do I use Looper.prepare()?
问题描述
可能重复：结果
<一href=\"http://stackoverflow.com/questions/3614663/cant-create-handler-inside-thread-that-has-not-called-looper-$p$ppare-inside-a\">Can’t里面活套。prepare（）线程已经不叫里面的AsyncTask的ProgressDialog 创建处理程序
我开发一个Android的服务，它试图获取设备的IP地址每x的时间，它comunicate到服务器。
我使用的是：
I'm developing an Android service that try to obtain the device IP address every x time and comunicate it to a server. I'm using:
Netbeans的7.2
Android SDK中
谷歌Android的API 8
的SQLite
Netbeans 7.2
Android SDK
Android Google-Api 8
SQLite
我知道有与此相同的问题了几个问题，但他们都不给我解决我的问题。正如你可以在我的下面code看到的，我不会试图访问该服务主线程的UI（好吧，我试过，但我评论了行之后，误差保持不变）。在另一方面，我使用的的AsyncTask 的，我认为这是适当的方式来做到这一点。
I know there are a few questions related to this same issue, but none of them gave me a solution to my problem. As you can see in my code below, I'm not trying to access to the UI of the service main thread (well, I tried, but after I commented the line, the error remains the same). On the other hand, I'm using AsyncTask, which I think is the appropriate way to do it.
这是我服务的主要部分：
This is the main part of my service:
public class ArsosService extends Service {
private NotificationManager mNM;
private final Messenger mMessenger = new Messenger(new IncomingHandler());
protected DatabaseUtil dbu = null;
@Override
public void onCreate() {
mNM = (NotificationManager) getSystemService(NOTIFICATION_SERVICE);
try {
dbu = DatabaseUtility.getInstance(this);
} catch (IOException ex) {
Log.e("Service", ex);
}
Timer timer = new Timer();
timer.schedule(new Checks(), 0, 15000);
}
private class Checks extends TimerTask {
@Override
public void run() {
CheckIpAddress_Task checkIp = new CheckIpAddress_Task();
checkIp.execute();
}
}
// Other methods
private class CheckIpAddress_Task extends AsyncTask<Void, Void, Integer> {
@Override
protected Integer doInBackground(Void... arg0) {
String ipLocal = getLocalIpAddress();
String text = null;
// ipLocal==null means there is no available connection, so we do nothing.
if (ipLocal != null) {
String ipDb = dbu.getLastIP(); // we get the IP saved in the DB.
if (ipDb == null) {
dbu.addProperty("IP", ipLocal); // we save the IP in the DB.
} else if (!ipLocal.equals(ipDb)) {
dbu.setProperty("IP", ipLocal); // we update the IP in the DB.
}
}
if (text != null) {
//showNotification(1, text, ipLocal);
}
return 0;
}
private String getLocalIpAddress() {
String result = null;
// Irrelevant code
return result;
}
}
}
我认为这个问题可能与线程，但我看不到的地方。任何帮助将AP preciated。
I think the problem may be related to the threads, but I can't see where. Any help will be appreciated.
编辑：虽然我已经接受了其中一个答案为正确，或者因为它，我一直在寻找一些信息关于它。我碰到此页面我想和大家谁哪天需要更多地了解这个问题分享。它的作者，Tejas的Lagvankar，介绍活动主题，尺蠖和处理在一个非常清晰易懂的方式应有尽有。
EDITED: Although I have accepted one of the answers as correct, or maybe because of it, I've been searching for some more information regard to it. I've run into this page I want to share with all of you who someday need to know more about this issue. Its author,Tejas Lagvankar, explains everything about threads, loopers and handler in a very clear and understandable way.
推荐答案
试试这个...
- 首先声明处理程序对象的引用变量的类范围
- First declare the Handler Object reference variable at class scope.
处理程序H;
- 在的onCreate（）方法创建的处理程序
- Inside the onCreate() method create the instance of the Handler.
H =新的处理程序（）;
- 螺纹使用它象下面这样：
- Use it with thread like below:
new Thread(new Runnable(){
public void run(){
h.post(new Runnable(){
// Do the UI work here.
});
}
});
- 您可以很好地使用的AsyncTask ，在android系统提供的，它为P知*的 ainless线程 *
- You can very well use the AsyncTask, provided in android, its known as P*ainless threading.*
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