blocks|key|2559113|text|我不知道你是怎么写你的Parsing.java的，它看起来不错，但请记住|type|unstyled|depth|inlineStyleRanges|entityRanges|data|2559114|此方法总是在其进程的主线程中调用，除非您使用registerReceiver显式要求将它调度在另一个线程上。当它在主线程上运行时，您不应该在其中执行长时间运行的操作(在考虑接收方被阻塞和候选人被杀死之前，系统允许的超时时间为10秒)。不能在onReceive()的实现中启动弹出对话框|blockquote|2559115|对我来说，我认为更好的处理方法是在onReceive方法中调用另一个服务，如下所示|2559116|@Override
++++public+void+onReceive(Context+context,+Intent+intent)+{
++++++++Intent+i+=+new+Intent(context,+ParsingService.class);
++++++++context.startService(i);
++++}|code-block|syntax|javascript|2559117|entityMap^0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|N|8|@]|9|@]|A|$]]|$1|B|3|C|5|D|7|O|8|@]|9|@]|A|$]]|$1|E|3|F|5|6|7|P|8|@]|9|@]|A|$]]|$1|G|3|H|5|I|7|Q|8|@]|9|@]|A|$J|K]]|$1|L|3|-4|5|6|7|R|8|@]|9|@]|A|$]]]|M|$]]

I don't know how you wrote your Parsing.java, it looks fine but remember this

<blockquote>
 This method is always called within the main thread of its process, unless you explicitly asked for it to be scheduled on a different thread using registerReceiver. When it runs on the main thread you should never perform long-running operations in it (there is a timeout of 10 seconds that the system allows before considering the receiver to be blocked and a candidate to be killed). You cannot launch a popup dialog in your implementation of onReceive()
</blockquote>

To me, i think it's a better way to handle this is calling another service inside onReceive method, like this

<pre><code>@Override
 public void onReceive(Context context, Intent intent) {
 Intent i = new Intent(context, ParsingService.class);
 context.startService(i);
 }
</code></pre>

blocks|key|742710|text|从一个AsyncTask启动BroadcastReceiver是错误的，原因有两个：|type|unstyled|depth|inlineStyleRanges|offset|length|style|CODE|entityRanges|data|742711|1.运行onReceive()的线程在方法返回后终止，从而有效地结束可能从那里启动的任何长时间运行的任务。引用官方的文档|BOLD|742712|BroadcastReceiver对象仅在调用onReceive(Context,+Intent)期间有效。一旦您的代码从此函数返回，系统将认为该对象已完成且不再活动……任何需要异步操作的操作都不可用，因为您需要从函数返回来处理异步操作，但此时BroadcastReceiver不再是活动的，因此系统可以在异步操作完成之前任意终止其进程。|blockquote|742713|2.+onReceive()提供的Context实例不同于Activity或Service的Context，即Activity.this或Service.this。您需要适当的Context来执行我们通常从Activity或Service执行的许多常见的有用操作。因此，例如，启动Service的正确方法是|742714|onReceive()是：|742715|@Override
public+void+onReceive(Context+context,+Intent+intent)+{
++++Intent+i+=+new+Intent(context.getApplicationContext(),+ParsingService.class);
++++context.getApplicationContext().startService(i);
}|code-block|syntax|javascript|742716|而不是|742717|@Override
public+void+onReceive(Context+context,+Intent+intent)+{
++++Intent+i+=+new+Intent(context,+ParsingService.class);
++++context.startService(i);
}|742718|entityMap|0|LINK|mutability|MUTABLE|url|http://developer.android.com/reference/android/content/BroadcastReceiver.html^0|3|9|E|H|0|0|2|4|B|1M|2|0|0|0|H|N|Q|3E|H|0|0|2|3|B|H|7|T|8|12|7|1A|7|1J|D|1X|C|2G|7|2V|8|34|7|3W|7|0|0|B|0|0|0|0^^$0|@$1|2|3|4|5|6|7|16|8|@$9|17|A|18|B|C]|$9|19|A|1A|B|C]]|D|@]|E|$]]|$1|F|3|G|5|6|7|1B|8|@$9|1C|A|1D|B|H]|$9|1E|A|1F|B|C]]|D|@$9|1G|A|1H|1|1I]]|E|$]]|$1|I|3|J|5|K|7|1J|8|@$9|1K|A|1L|B|C]|$9|1M|A|1N|B|C]|$9|1O|A|1P|B|C]]|D|@]|E|$]]|$1|L|3|M|5|6|7|1Q|8|@$9|1R|A|1S|B|H]|$9|1T|A|1U|B|C]|$9|1V|A|1W|B|C]|$9|1X|A|1Y|B|C]|$9|1Z|A|20|B|C]|$9|21|A|22|B|C]|$9|23|A|24|B|C]|$9|25|A|26|B|C]|$9|27|A|28|B|C]|$9|29|A|2A|B|C]|$9|2B|A|2C|B|C]|$9|2D|A|2E|B|C]]|D|@]|E|$]]|$1|N|3|O|5|6|7|2F|8|@$9|2G|A|2H|B|C]]|D|@]|E|$]]|$1|P|3|Q|5|R|7|2I|8|@]|D|@]|E|$S|T]]|$1|U|3|V|5|6|7|2J|8|@]|D|@]|E|$]]|$1|W|3|X|5|R|7|2K|8|@]|D|@]|E|$S|T]]|$1|Y|3|-4|5|6|7|2L|8|@]|D|@]|E|$]]]|Z|$10|$5|11|12|13|E|$14|15]]]]

Starting an <code>AsyncTask</code> from a <code>BroadcastReceiver</code> is wrong for two reasons:

1. The thread on which <code>onReceive()</code> runs is terminated after the method returns, effectively ending any long-running task which may have been started from there. To quote the official <a href="http://developer.android.com/reference/android/content/BroadcastReceiver.html" rel="nofollow">docs</a>:

<blockquote>
 A <code>BroadcastReceiver</code> object is only valid for the duration of the
 call to <code>onReceive(Context, Intent)</code>. Once your code returns from this
 function, the system considers the object to be finished and no longer
 active ..... anything that requires asynchronous operation is not
 available, because you will need to return from the function to handle
 the asynchronous operation, but at that point the <code>BroadcastReceiver</code>
 is no longer active and thus the system is free to kill its process
 before the asynchronous operation completes.
</blockquote>

2. The <code>Context</code> instance that <code>onReceive()</code> provides is not the same as
the <code>Context</code> of an <code>Activity</code> or <code>Service</code>, i.e. <code>Activity.this</code> or 
<code>Service.this</code>. You need that proper <code>Context</code> for performing many of
the common useful operations that we usually do from an <code>Activity</code> or
<code>Service</code>. So, for example, the correct way to start a <code>Service</code> in 
<code>onReceive()</code> is:

<pre><code>@Override
public void onReceive(Context context, Intent intent) {
 Intent i = new Intent(context.getApplicationContext(), ParsingService.class);
 context.getApplicationContext().startService(i);
}
</code></pre>

and not

<pre><code>@Override
public void onReceive(Context context, Intent intent) {
 Intent i = new Intent(context, ParsingService.class);
 context.startService(i);
}
</code></pre>

I had setup AlarmManager in my <code>MainActivity</code> class.

A class called <code>AlarmReceiver</code> gets fired up for every set interval of time.

I have to perform an operation when that class is fired up. That code is in in another class <code>Parsing.java</code>

Now in AlarmReceiver.java, I'm doing this :

<pre><code>public class AlarmReceiver extends BroadcastReceiver {

 @Override
 public void onReceive(Context context, Intent intent) {

 Parsing obj = new Parsing(context);

 obj.execute();

 }
}
</code></pre>

I cannot write the code directly in <code>AlarmReceiver.java</code>, because <code>AlarmReceiver.java</code> is already extending <code>BroadcastReceiver</code>and my code which is <code>Parsing.java</code> is extending another class. 

So, I'm creating an object for <code>Parsing</code> class and calling that method.

Is my approach correct? 

I'll furnish further information in case needed.
Please let me know if my approach is correct?
Thanks in advance!

EDIT:

Parsing.java

<pre><code>public class Parsing extends AsyncTask&lt;Void, Void, Void&gt; {

//some code

}
</code></pre>

AlarmManager - Am I doing it right?

翻译质量差，导致语言生硬或混乱。

没有提供实际的解决方法或示例。

解答不清晰，无法理解或解决问题。

页面排版不美观，阅读体验差。

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我在我的AlarmManager类中设置了MainActivity。一个名为AlarmReceiver的类在每一组时间间隔上都会被激发。当那个类被激发时，我必须执行一个操作。该代码位于另一个类Parsing.java中。现在在AlarmReceiver.java，，我正在做这样的事情：public class Alar...

问AlarmManager -我做得对吗？
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问AlarmManager -我做得对吗？EN