blocks|key|4501038|text|我应该申报哪一项许可？
|type|blockquote|depth|inlineStyleRanges|entityRanges|data|4501039|unstyled|4501040|AFAIK没有相关的许可。不幸的是，setThreadPriority()的实现是在本机代码中，这使我很难弄清楚到底发生了什么。|offset|length|style|CODE|4501041|cm男似乎否认这是CM的错误
|4501042|4501043|不，他们没有。没有人发布证据证明这是CM9或更高版本的问题，这就是为什么他们把这个问题标为陈腐的原因。如果您在CM9或更高版本上看到这个问题，我建议您更新这个问题。如果您在标准Android上看到这一点，请创建一个可以重现错误的示例项目。|4501044|如何从我的应用程序修复它？
|4501045|4501046|很有可能你不知道。您可以尝试在您的WebView上运行一些实验，看看是否有特定的内容触发此异常，并尝试修改或删除该内容。|4501047|entityMap^0|0|0|I|J|0|0|0|0|0|0|H|7|0^^$0|@$1|2|3|4|5|6|7|V|8|@]|9|@]|A|$]]|$1|B|3|-4|5|C|7|W|8|@]|9|@]|A|$]]|$1|D|3|E|5|C|7|X|8|@$F|Y|G|Z|H|I]]|9|@]|A|$]]|$1|J|3|K|5|6|7|10|8|@]|9|@]|A|$]]|$1|L|3|-4|5|C|7|11|8|@]|9|@]|A|$]]|$1|M|3|N|5|C|7|12|8|@]|9|@]|A|$]]|$1|O|3|P|5|6|7|13|8|@]|9|@]|A|$]]|$1|Q|3|-4|5|C|7|14|8|@]|9|@]|A|$]]|$1|R|3|S|5|C|7|15|8|@$F|16|G|17|H|I]]|9|@]|A|$]]|$1|T|3|-4|5|C|7|18|8|@]|9|@]|A|$]]]|U|$]]

<blockquote>
 which permission should I declare？
</blockquote>

There is no relevant permission for this AFAIK. Unfortunately, the implementation of <code>setThreadPriority()</code> is in native code, which makes it difficult for me to figure out what is going on.

<blockquote>
 cm menbers seem to deny it's CM's bug
</blockquote>

No, they do not. Nobody has posted evidence that it is a problem in CM9 or higher, which is why they marked the issue as stale. If you are seeing this on CM9 or higher, I suggest that you update the issue. If you are seeing this on standard Android, please create a sample project that can reproduce the error.

<blockquote>
 How to fix it from my app?
</blockquote>

You don't, in all likelihood. You could try running some experiments on your <code>WebView</code>, to see if there is some specific content that triggers this exception, and try to modify or eliminate that content.

blocks|key|4521000|text|我从我的应用程序(它严重依赖于webview+)中得到了几十个由这个异常引起的崩溃日志，涉及的ROM版本分别是4.0.4和4.0.3。|type|unstyled|depth|inlineStyleRanges|entityRanges|data|4521001|似乎没有正常的方法来修复它，所以我尝试遵循黑客的方法。|4521002|4.0.4上的代码片段：|4521003|private+static+Handler+sWebCoreHandler;
//+Class+for+providing+Handler+creation+inside+the+WebCore+thread.
private+static+class+WebCoreThread+implements+Runnable+{
++++//+Message+id+for+initializing+a+new+WebViewCore.
++++private+static+final+int+INITIALIZE+=+0;
++++private+static+final+int+REDUCE_PRIORITY+=+1;
++++private+static+final+int+RESUME_PRIORITY+=+2;

++++public+void+run()+{
++++++++Looper.prepare();
++++++++Assert.assertNull(sWebCoreHandler);
++++++++synchronized+(WebViewCore.class)+{
++++++++++++sWebCoreHandler+=+new+Handler()+{
++++++++++++++++@Override
++++++++++++++++public+void+handleMessage(Message+msg)+{
++++++++++++++++++++//+...
++++++++++++++++++++//+Process.setPriority(...)
++++++++++++++++}
++++++++++++};
++++++++//+...
++++++++}
++++++++//+...
++++}
}|code-block|syntax|javascript|4521004|我认为这个异常是从sWebCoreHandler.handleMessage()抛出的，如果我们可以在handleMessage()上包装try/catch，那么问题就会得到解决。|4521005|处理程序类有四个成员：|4521006|final+MessageQueue+mQueue;
final+Looper+mLooper;
final+Callback+mCallback;
IMessenger+mMessenger;|4521007|mQueue设置为mLooper.mQueue，mCallback在sWebCoreHandler中为null，因此我们只需要在sWebCoreHandler中设置带有值的mLooper和mMessenger。|4521008|static+Handler+sProxyHandler+=+null;

static+void+tryTweakWebCoreHandler()+{
++++//+4.0.3/4.0.4+rom
++++if+(Build.VERSION.SDK_INT+==+Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1)+{
++++++++tweakWebCoreHandle();
++++}
}

static+private+void+tweakWebCoreHandle()+{
++++if+(sProxyHandler+!=+null)
++++++++return;
++++try+{
++++++++Field+f+=+Class.forName("android.webkit.WebViewCore").getDeclaredField("sWebCoreHandler");
++++++++f.setAccessible(true);
++++++++Object+h+=+f.get(null);
++++++++Object+mMessenger+=+null;
++++++++Method+m+=+Handler.class.getDeclaredMethod("getIMessenger",+(Class<?>[])null);
++++++++m.setAccessible(true);
++++++++mMessenger+=+m.invoke(h,+(Object[])null);
++++++++sProxyHandler+=+new+WebCoreProxyHandler((Handler)h);
++++++++if+(mMessenger+!=+null)+{
++++++++++++Field+f1+=+Handler.class.getDeclaredField("mMessenger");
++++++++++++f1.setAccessible(true);
++++++++++++f1.set(sProxyHandler,+mMessenger);
++++++++}
++++++++f.set(null,+sProxyHandler);
++++++++//+Log.w(TAG,++"sWebCoreHandler:+"+%2B+h);
++++}+catch+(Throwable+e)+{
++++++++Log.w(TAG,+"exception:+"+%2B+e);
++++}
++++if+(sProxyHandler+==+null)
++++++++sProxyHandler+=+new+Handler();
}

static+class+WebCoreProxyHandler+extends+Handler+{
++++final+Handler+handler;
++++public+WebCoreProxyHandler(Handler+handler)+{
++++++++super(handler.getLooper());
++++++++this.handler+=+handler;
++++}

++++public+void+handleMessage(Message+msg)+{
++++++++//+Log.w("WebCoreProxyHandler",+"handle+msg:+"+%2B+msg.what);
++++++++try+{
++++++++++++handler.handleMessage(msg);
++++++++}+catch+(Throwable+tr)+{
++++++++++++Log.w("WebCoreProxyHandler",+"exception:+"+%2B+tr);
++++++++}
++++}
}|4521009|仍然存在的问题是何时调用tryTweakWebCoreHandler()。在一些设备上创建和测试WebView实例之后，我尝试调用它，可以调用WebCoreProxyHandler.handleMessage()。|4521010|注:我只是做了一些简单的测试，我不确定这个问题是否解决了，因为原始异常不能可靠地再现。|4521011|如果您决定尝试这种方法，请做足够的测试。|4521012|entityMap^0|0|0|0|0|0|0|0|0|0|0|0|0^^$0|@$1|2|3|4|5|6|7|12|8|@]|9|@]|A|$]]|$1|B|3|C|5|6|7|13|8|@]|9|@]|A|$]]|$1|D|3|E|5|6|7|14|8|@]|9|@]|A|$]]|$1|F|3|G|5|H|7|15|8|@]|9|@]|A|$I|J]]|$1|K|3|L|5|6|7|16|8|@]|9|@]|A|$]]|$1|M|3|N|5|6|7|17|8|@]|9|@]|A|$]]|$1|O|3|P|5|H|7|18|8|@]|9|@]|A|$I|J]]|$1|Q|3|R|5|6|7|19|8|@]|9|@]|A|$]]|$1|S|3|T|5|H|7|1A|8|@]|9|@]|A|$I|J]]|$1|U|3|V|5|6|7|1B|8|@]|9|@]|A|$]]|$1|W|3|X|5|6|7|1C|8|@]|9|@]|A|$]]|$1|Y|3|Z|5|6|7|1D|8|@]|9|@]|A|$]]|$1|10|3|-4|5|6|7|1E|8|@]|9|@]|A|$]]]|11|$]]

I get dozens of crash log caused by this exception from my app (which depends on webview heavily), involved ROM version are 4.0.4 and 4.0.3.

It seems that there is no normal way to fix it, so i tried following hacking approach.

code snipet on 4.0.4:

<pre><code>private static Handler sWebCoreHandler;
// Class for providing Handler creation inside the WebCore thread.
private static class WebCoreThread implements Runnable {
 // Message id for initializing a new WebViewCore.
 private static final int INITIALIZE = 0;
 private static final int REDUCE_PRIORITY = 1;
 private static final int RESUME_PRIORITY = 2;

 public void run() {
 Looper.prepare();
 Assert.assertNull(sWebCoreHandler);
 synchronized (WebViewCore.class) {
 sWebCoreHandler = new Handler() {
 @Override
 public void handleMessage(Message msg) {
 // ...
 // Process.setPriority(...)
 }
 };
 // ...
 }
 // ...
 }
}
</code></pre>

I think this exception is thrown from sWebCoreHandler.handleMessage(), if we can wrap try/catch on handleMessage(), the problem could be fixed.

Handler class has four members:

<pre><code>final MessageQueue mQueue;
final Looper mLooper;
final Callback mCallback;
IMessenger mMessenger;
</code></pre>

mQueue is set as mLooper.mQueue, mCallback is null in sWebCoreHandler, so we just need to set mLooper and mMessenger with values in sWebCoreHandler.

<pre><code>static Handler sProxyHandler = null;

static void tryTweakWebCoreHandler() {
 // 4.0.3/4.0.4 rom
 if (Build.VERSION.SDK_INT == Build.VERSION_CODES.ICE_CREAM_SANDWICH_MR1) {
 tweakWebCoreHandle();
 }
}

static private void tweakWebCoreHandle() {
 if (sProxyHandler != null)
 return;
 try {
 Field f = Class.forName("android.webkit.WebViewCore").getDeclaredField("sWebCoreHandler");
 f.setAccessible(true);
 Object h = f.get(null);
 Object mMessenger = null;
 Method m = Handler.class.getDeclaredMethod("getIMessenger", (Class&lt;?&gt;[])null);
 m.setAccessible(true);
 mMessenger = m.invoke(h, (Object[])null);
 sProxyHandler = new WebCoreProxyHandler((Handler)h);
 if (mMessenger != null) {
 Field f1 = Handler.class.getDeclaredField("mMessenger");
 f1.setAccessible(true);
 f1.set(sProxyHandler, mMessenger);
 }
 f.set(null, sProxyHandler);
 // Log.w(TAG, "sWebCoreHandler: " + h);
 } catch (Throwable e) {
 Log.w(TAG, "exception: " + e);
 }
 if (sProxyHandler == null)
 sProxyHandler = new Handler();
}

static class WebCoreProxyHandler extends Handler {
 final Handler handler;
 public WebCoreProxyHandler(Handler handler) {
 super(handler.getLooper());
 this.handler = handler;
 }

 public void handleMessage(Message msg) {
 // Log.w("WebCoreProxyHandler", "handle msg: " + msg.what);
 try {
 handler.handleMessage(msg);
 } catch (Throwable tr) {
 Log.w("WebCoreProxyHandler", "exception: " + tr);
 }
 }
}
</code></pre>

Remain problem is when to invoke tryTweakWebCoreHandler(). I tried to invoke it after a WebView instance is created and tested on some devices, WebCoreProxyHandler.handleMessage() can be called.

Note: i just made some simple test, i'm not sure this problem is resolved as the origin exception can not be reproduced reliably.

If you decide to try this approach, please do enough test.

crash log:

<pre><code> java.lang.SecurityException: No permission to modify given thread
android.os.Process.setThreadPriority(Native Method)
android.webkit.WebViewCore$WebCoreThread$1.handleMessage(WebViewCore.java:764)
android.os.Handler.dispatchMessage(Handler.java:99)
android.os.Looper.loop(Looper.java:137)
android.webkit.WebViewCore$WebCoreThread.run(WebViewCore.java:829)
java.lang.Thread.run(Thread.java:856)
</code></pre>

which permission should I declare？
<a href="http://developer.android.com/reference/android/Manifest.permission.html" rel="nofollow noreferrer">http://developer.android.com/reference/android/Manifest.permission.html</a>

edit:

I found a similar problem in <a href="https://stackoverflow.com/questions/11025182/webview-java-lang-securityexception-no-permission-to-modify-given-thread">WebView java.lang.SecurityException: No permission to modify given thread</a>

The Answer say "It's cyanogen's fault." 

However, in the thread <a href="http://code.google.com/p/cyanogenmod/issues/detail?id=5656&amp;thanks=5656&amp;ts=1341224425" rel="nofollow noreferrer">http://code.google.com/p/cyanogenmod/issues/detail?id=5656&amp;thanks=5656&amp;ts=1341224425</a>,cm menbers seem to deny it's CM's bug

Above all, my question is:
How to fix it from my app?

Android WebView No permission to modify given thread, which permission should I declare？

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撞车日志：    java.lang.SecurityException: No permission to modify given threadandroid.os.Process.setThreadPriority(Native Method)android.webkit.WebViewCore$WebCoreT...

问Android WebView没有修改给定线程的权限，我应该声明哪个权限？
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问Android WebView没有修改给定线程的权限，我应该声明哪个权限？EN