Eclipse的调试Android应用程序 - 调试器显示错误的行执行 [英] Eclipse debugging Android app - debugger shows wrong line executing

问题描述

而在我的应用程序执行Twitter的整合，我发现Eclipse调试器下面奇怪。是什么原因造成的？

While implementing Twitter integration in my app, I discovered the following oddness of the Eclipse debugger. What is causing this?

我使用这个AsyncTask的使用twitter4j 3.0.3从Twitter获得一个请求令牌。

I'm using this AsyncTask for getting a request token from twitter using twitter4j 3.0.3.

    public class TwitterRequestAsync extends AsyncTask<Void, Void, RequestToken> {

        private Context context;

        public TwitterRequestAsync(Context context) {

            this.context = context;
        }

        @Override
        protected RequestToken doInBackground( Void... params ) {

            Twitter twitter = getTwitter();     // getTwitter() is in enclosing class
            try {
                RequestToken token = twitter.getOAuthRequestToken();
                return token;
            }
            catch (TwitterException e) {
                Log.e( TAG, e.getMessage(), e );
                return null;
            }
        }

        @Override
        protected void onPostExecute( RequestToken result ) {

            super.onPostExecute( result );
            if ( result != null ) {
                // stuffs concerning request token here
            }
        }

    }

当我调试这个code，似乎有getOAuthRequestToken（）执行时抛出一个异常，下一行，调试器显示执行的是catch子句中，返回null;

When I debug this code it appears that there is an exception thrown when getOAuthRequestToken() executes and the next line that the debugger shows executing is in the catch clause, return null;

然而，返回给onPostExecute（...）的结果是一个有效的请求令牌，所以调试器做一些奇怪的。我清理我的项目，每个多次在这一行为没有变化重新启动Eclipse的。我是不是坏了？

However, the result that is returned to onPostExecute(...) is a valid request token, so the debugger is doing something weird. I've cleaned my project and restarted Eclipse each multiple times with no change in this behavior. Am I broken?

推荐答案

这是一个已知的问题。看来，它可能是与Dalvik虚拟机中的问题。该方法的最后一个返回语句显示在调试器来执行

This is a known issue. It appears that it could be a problem with the Dalvik VM. The last return statement of the method is shown to execute in the debugger.

更改doInBackground身体：

Changing the doInBackground body to:

        @Override
        protected RequestToken doInBackground( Void... params ) {

            Twitter twitter = getTwitter();
            RequestToken token = null;
            try {
                token = twitter.getOAuthRequestToken();
            }
            catch (TwitterException e) {
                Log.e( TAG, e.getMessage(), e );
            }
            return token;
        }

使执行出现继续如预期。

Causes execution to appear to proceed as expected.

请参阅的https://groups.google.com/forum/?fromgroups=#!topic/android-developers/DEU6JmdyFyM对于一个老提这个问题的一个链接到一个更老的提及。终于有人创造了这一个问题在 https：//开头code.google.com / p /安卓/问题/细节？ID = 34193 。

See https://groups.google.com/forum/?fromgroups=#!topic/android-developers/DEU6JmdyFyM for an old mention of the problem with a link to an even older mention. Someone finally created an issue for this at https://code.google.com/p/android/issues/detail?id=34193.

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