java - Android 代码发布到服务器时出错

Question

我有代码将详细信息发布到服务器，但每当我调用该方法时，应用程序就会停止!

public void postDetails()
{

    Toast.makeText(BTPrinterDemo.this, "Am supposed to post"+longi+"..."+lati+" for device: "+imei, Toast.LENGTH_LONG).show();

    /*
     * Posting coordinates to server
     * 
     * */
      HttpClient httpcl = new DefaultHttpClient();
      HttpPost httppst = new HttpPost("https://xxxxxxxxxxx/myfile/geo");
      //geo is a JSON file on server                    
      try {


           // Add your data
           List<NameValuePair> nameValuePairz = new ArrayList<NameValuePair>(4);
           nameValuePairz.add(new BasicNameValuePair("geo-type","geo..me"));
           nameValuePairz.add(new BasicNameValuePair("long",longi));
           nameValuePairz.add(new BasicNameValuePair("lat",lati));
           nameValuePairz.add(new BasicNameValuePair("imei",imei));
          //
          httppst.setEntity(new UrlEncodedFormEntity(nameValuePairz)); 

            // Execute HTTP Post Request
            HttpResponse response = httpcl.execute(httppst);
            String responseBody0 = EntityUtils.toString(response.getEntity());
            if(responseBody0.trim().equals("")){
                Toast.makeText(ctx, "No Response. Check internet connectivity : "+responseBody0.trim(), Toast.LENGTH_LONG).show();
            }else{
                Toast.makeText(ctx, "Response : "+responseBody0.trim(), Toast.LENGTH_LONG).show();

                if(responseBody0.trim().equals("ERROR")){
                    Toast.makeText(ctx, "An Error occured. Contact the administrator", Toast.LENGTH_LONG).show();
                    return;
                }
                if(responseBody0.trim().equals("NONE")){
                    Toast.makeText(ctx, "Login Invalid", Toast.LENGTH_LONG).show();
                    return;
                }
                    return;
            }


        } catch (ClientProtocolException e) {
            Toast.makeText(ctx, e.getMessage(), Toast.LENGTH_LONG).show();
        } catch (IOException e) {
            Toast.makeText(ctx, e.getMessage(), Toast.LENGTH_LONG).show();
        }

}

当我评论代码以发布“toast”时，代码运行得很好，但是一旦我调用整个方法，应用程序就会崩溃。

Answer 1

两种可能性:

1. 它在后台线程中运行。

2. 该行中的一个变量为 null