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Question

这是代码，应该从指定的网站读取文本，但变量“结果”只是给我没有输出。我无法让函数main(null)运行。无论何时何地，它都会让应用程序崩溃。(我正在拨打onCreate() of MainActivity)

    public class ConvertUrlToString {

         public void main(String[] args) {

            try {
                webPage = "http://www.albab.pk/albab_edu/mashal/dsms.aspx";
                URL url = new URL(webPage);
                URLConnection urlConnection = url.openConnection();
                InputStream is = urlConnection.getInputStream();
                InputStreamReader isr = new InputStreamReader(is);

                int numCharsRead;
                char[] charArray = new char[1024];
                StringBuffer sb = new StringBuffer();
                while ((numCharsRead = isr.read(charArray)) > 0) {
                    sb.append(charArray, 0, numCharsRead);
                }
                result = sb.toString();

            } catch (MalformedURLException e) {
                e.printStackTrace();
            } catch (IOException e) {
                e.printStackTrace();
            }
        }
    }

    public void onClick(View arg0) {
        // TODO Auto-generated method stub

        SmsManager sms = SmsManager.getDefault();
        PendingIntent piSent = PendingIntent.getBroadcast(this, 0, new Intent("SMS_SENT"), 0);
        PendingIntent piDelivered = PendingIntent.getBroadcast(this, 0, new Intent("SMS_DELIVERED"), 0);
        sms.sendTextMessage("+923018744545", null, "Hi There!", piSent, piDelivered);
    }

public void onReceive(Context arg0, Intent arg1) {
                // TODO Auto-generated method stub
                switch (getResultCode()) {
                case Activity.RESULT_OK:
                    Toast.makeText(getBaseContext(), result, Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_GENERIC_FAILURE:
                    Toast.makeText(getBaseContext(), "Generic Failure", Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_NO_SERVICE:
                    Toast.makeText(getBaseContext(), "No Service", Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_NULL_PDU:
                    Toast.makeText(getBaseContext(), "Null PDU", Toast.LENGTH_SHORT).show();
                    break;
                case SmsManager.RESULT_ERROR_RADIO_OFF:
                    Toast.makeText(getBaseContext(), "Radio Off", Toast.LENGTH_SHORT).show();
                    break;
                default:
                    break;
                }

            }

Answer 1

你的代码看起来很好，我已经测试过了。它起作用了。请检查你是否给了互联网许可。将此添加到AndroidManifest.xml <uses-permission android:name="android.permission.INTERNET" />中

另外，既然你说的是"eclipse“，我想你是通过模拟器来尝试的。在这种情况下，检查机器是否在任何代理后面？如果是这样，您还需要添加适当的系统属性。

System.setProperty("http.proxyHost", "your host name/ip");
System.setProperty("http.proxyPort", "your host port");

当我说它起作用时，我只是在讨论main()方法。调用PendingIntent.getBroadcast(this, 0, new Intent(result), 0);时，应确保在单击之前设置结果值，即验证是否在单击事件之前调用主方法。