android - AsyncTask 错误 - android.os.NetworkOnMainThreadException

Question

我收到错误:android.os.NetworkOnMainThreadException。我的应用程序在模拟器上运行良好。然后我在一些设备上检查它，它在 android 版本 2.3.5 上工作正常，但在第二个设备版本 4.0.3 上出错。我正在使用 AsyncTask 如下:

private class TheTask extends AsyncTask<String, String, String> {

    @Override
    protected void onPreExecute() {
        dialog = ProgressDialog.show(Main.this, "",
                "Loading. Please wait...", true);
    }

    @Override
    protected String doInBackground(String... params) {

        request = new SoapObject(NAMESPACE, METHOD_NAME);

        userid = new PropertyInfo();
        userid.setName("UserId");
        userid.setValue(UserId);
        userid.setType(String.class);
        request.addProperty(userid);

        SoapSerializationEnvelope envp = new SoapSerializationEnvelope(
                SoapEnvelope.VER11);
        envp.dotNet = true;
        envp.setOutputSoapObject(request);
        HttpTransportSE androidHttpTransport = new HttpTransportSE(URL);
        try {
            androidHttpTransport.call(SOAP_ACTION, envp);
            SoapPrimitive response = (SoapPrimitive) envp.getResponse();
            Response = response.toString();

        } catch (Exception e) {
            e.printStackTrace();
        }

        return Response;
    }

    @Override
    protected void onPostExecute(String result) {

        if (dialog != null) {
            if (dialog.isShowing()) {
                dialog.dismiss();
            }
        }

        try {
            splitData = result.split("\\;");
            username.setText(splitData[0]);

            URL newurl = new URL("" + WebsiteURL + "/images/profileImg/"
                    + splitData[1] + "");
            Bitmap mIcon_val = BitmapFactory.decodeStream(newurl
                    .openConnection().getInputStream());
            userphoto.setImageBitmap(mIcon_val);
        } catch (Exception e) {
            username.setText(e.toString());
        }

    }
}

Answer 1

你正在调用这段代码:

位图 mIcon_val = BitmapFactory.decodeStream(newurl
.openConnection().getInputStream());

在你的 onPostExecute 中。这意味着代码再次在主线程上执行，导致您的 NetworkOnMainThread 异常。在doInBackground中将图片保存到一个变量中，并在onPostCreate中将图片设置到ImageView中。