Question

我想在用户点击DONE后发送简单的http通知。我使用AsyncTask进行网络操作，我不明白为什么应用程序仍会因此异常android.os.NetworkOnMainThreadException而崩溃。

private void buttonPressed() {
    EditText editTextLogin = (EditText) findViewById(R.id.editTextPassword);

    editTextLogin.setOnEditorActionListener(new OnEditorActionListener() {

        @Override
        public boolean onEditorAction(TextView arg0, int actionId, KeyEvent event) {
            try{
                MyAsync test = new MyAsync(activity);
                test.execute("http://google.com");
            }catch (Exception e) {
                // TODO: handle exception
                Log.e("log_tag", "Error in http connection "+e.toString());
            }
            return true;
        }
    });
}

我不允许在那条线上执行此任务？

这是班级

class MyAsync extends AsyncTask<String, Void, String[]>{
    private final Activity activity;

    public MyAsync(Activity anActivity){
        activity = anActivity; //just in case i will need it later
    }

    @Override
    protected String[] doInBackground(String... args) {
        // TODO Auto-generated method stub
        Document doc = Jsoup.connect(args[0]).get();
        //do something with this document as soon this error android.os.NetworkOnMainThreadException wont rise again
        return new String[0];
    }

    @Override
    // Once the image is downloaded, associates it to the imageView
    protected void onPostExecute(String[] result) {
        Log.e('MyAsync','Finally i got it to work');
    }
}

错误Logcat： -

10-26 23:20:16.729: E/AndroidRuntime(1029): FATAL EXCEPTION: AsyncTask #1
10-26 23:20:16.729: E/AndroidRuntime(1029): java.lang.RuntimeException: An error occured while executing doInBackground()
10-26 23:20:16.729: E/AndroidRuntime(1029):     at android.os.AsyncTask$3.done(AsyncTask.java:278)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.util.concurrent.FutureTask$Sync.innerSetException(FutureTask.java:273)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.util.concurrent.FutureTask.setException(FutureTask.java:124)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:307)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at android.os.AsyncTask$SerialExecutor$1.run(AsyncTask.java:208)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1076)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:569)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.lang.Thread.run(Thread.java:856)
10-26 23:20:16.729: E/AndroidRuntime(1029): Caused by: java.lang.VerifyError: org/jivesoftware/smack/sasl/SASLMechanism
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.lang.reflect.Constructor.constructNative(Native Method)
10-26 23:20:16.729: E/AndroidRuntime(1029):     at java.lang.reflect.Constructor.newInstance(Constructor.java:417)

Answer 1

显然，您使用的是与Android不兼容的Smack版本。 IIRC，你应该使用一个aSmack库。

你可以告诉我这是Smack的一个问题，因为例外：

10-26 23:20:16.729: E/AndroidRuntime(1029): Caused by: java.lang.VerifyError: org/jivesoftware/smack/sasl/SASLMechanism

org.jivesoftware.smack是Smack库。

您还会注意到，这不是android.os.NetworkOnMainThreadException，而是java.lang.VerifyError。

即使我使用AsyncTask为什么我仍然得到这个“android.os.NetworkOnMainThreadException”

1 个答案: