android - AlertDialog 未显示在 catch block 中

Question

我正在尝试从网络上解析一些 XML 数据。大多数时候，XML 在我的应用程序中是干净的并且显示良好。这非常有效。我还想内置一些安全性，这样应用程序就不会在出现错误的 XML 时崩溃。

因此，当无法解析 XML 时，它会跳转到我的 catch block ，我会在其中继续执行此操作:

try {
            Log.e("in try", "try");
            /* Create a URL we want to load some xml-data from. */
            URL url = new URL("http://172.21.150.140:80/scripts/cgiip.exe/WService=brAccentBe/Android/getVacatureDetails.html?Vacid=" + vacaid + "&Kantoorid=" + kantoorid);

            System.out.println("Url " + url);
            /* Get a SAXParser from the SAXPArserFactory. */
            SAXParserFactory spf = SAXParserFactory.newInstance();
            SAXParser sp = spf.newSAXParser();

            /* Get the XMLReader of the SAXParser we created. */
            XMLReader xr = sp.getXMLReader();
            /* Create a new ContentHandler and apply it to the XML-Reader*/ 
            vacatureDetailsWebservice vs = new vacatureDetailsWebservice();
            xr.setContentHandler(vs);

            /* Parse the xml-data from our URL. */
            xr.parse(new InputSource(url.openStream()));
            /* Parsing has finished. */

            /* Our ExampleHandler now provides the parsed data to us. */
            vaca = vs.getVacatures();


        }    
 catch (Exception e) {
            final AlertDialog.Builder builder = new AlertDialog.Builder(JobDetails.this);
            builder.setTitle("Fout in XML");
            builder.setMessage("Er is een fout opgetreden in de data. Probeer het later nog eens");
            builder.setCancelable(false);
            builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

                public void onClick(DialogInterface dialog, int which) {
                    dialog.dismiss();
                    finish();
                }
            }); 
            builder.create().show();
        }

但对话框不会显示，该类继续运行并获取其他异常，因为未解析 XML。该方法在 onCreate 中调用。

有人看到我做错了什么吗？

Answer 1

请尝试下面的方法可能会起作用但不确定...

bool 值 = false;

尝试{

//你的代码

} catch (异常 e){

bol=真；

     if (bol){

       final AlertDialog.Builder builder = new AlertDialog.Builder(this);
        builder.setTitle("Fout in XML");
        builder.setMessage("Er is een fout opgetreden in de data. Probeer het later nog eens");
        builder.setCancelable(false);
        builder.setPositiveButton("OK", new DialogInterface.OnClickListener() {

            public void onClick(DialogInterface dialog, int which) {
                dialog.dismiss();
                finish();
            }
        }); 
        builder.create().show();
    }