空对象转换为字符串 [英] Convert null object to String

问题描述

我已经写了一个机器人程序加载值从Web服务为tablerow。但价值来自空，所以我需要做转换成字符串。可有一个人告诉我的方法去做。

 尝试{

    SoapObject请求= service.getRequest（）;
    SoapSerializationEnvelope信封= service.getEnvelope（要求）;
    SoapObject响应= service.getResponse（信封）;
    Log.i（服务大师，response.toString（））;
    诠释计数= response.getPropertyCount（）;
    的for（int i = 0; I＆LT;计数;我++）{
        SoapObject结果=（SoapObject）response.getProperty（ⅰ）;
        DeleteuserDetails deleteuserDetails =新DeleteuserDetails（）;
        deleteuserDetails.setUserId（result.getPropertyAsString（4））;
        deleteuserDetails.setUserName（result.getPropertyAsString（2））;
        deleteuserDetails.setUserRole（result.getPropertyAsString（3））;
        deleteuserDetails.setCreatedDate（result.getPropertyAsString（1））;
        deleteuserDetails.setCreatedBy（result.getPropertyAsString（0））;
        userdetail.add（deleteuserDetails）;
    }
 

现在 deleteuserDetails.setCreatedBy（result.getPropertyAsString（0））; 会从web服务的空值，所以我需要将其转换成字符串空。

LogCat中：

  12-20 18：48：52.608：W / System.err的（2174）：显示java.lang.NullPointerException
12-20 18：48：52.608：W / System.err的（2174）：在org.ksoap2.serialization.SoapObject.getPropertyAsString（SoapObject.java:165）
12-20 18：48：52.608：W / System.err的（2174）：在com.mvss.admin.Deleteuser $ deteUserIdLoad.doInBackground（Deleteuser.java:81）
12-20 18：48：52.608：W / System.err的（2174）：在com.mvss.admin.Deleteuser $ deteUserIdLoad.doInBackground（Deleteuser.java:1）
12-20 18：48：52.608：W / System.err的（2174）：在android.os.AsyncTask $ 2.call（AsyncTask.java:185）
12-20 18：48：52.608：W / System.err的（2174）：在java.util.concurrent.FutureTask中$ Sync.innerRun（FutureTask.java:305）
12-20 18：48：52.608：W / System.err的（2174）：在java.util.concurrent.FutureTask.run（FutureTask.java:137）
12-20 18：48：52.608：W / System.err的（2174）：在java.util.concurrent.ThreadPoolExecutor.runWorker（ThreadPoolExecutor.java:1068）
12-20 18：48：52.608：W / System.err的（2174）：在java.util.concurrent.ThreadPoolExecutor中的$ Worker.run（ThreadPoolExecutor.java:561）
12-20 18：48：52.608：W / System.err的（2174）：在java.lang.Thread.run（Thread.java:1096）
 

解决方案

使用此，

 尝试{
    deleteuserDetails.setCreatedBy（result.getPropertyAsString（0）的ToString（））;
}
赶上（例外五）{
    deleteuserDetails.setCreatedBy（空）;
}
 

I have written an android program to load values to tablerow from web service. But a value comes null so I need do convert it into string. Can some one tell me the method to do it.

try{                    

    SoapObject request = service.getRequest();
    SoapSerializationEnvelope envelope = service.getEnvelope(request);
    SoapObject response = service.getResponse(envelope);
    Log.i("Service Master", response.toString());
    int count = response.getPropertyCount();
    for (int i = 0; i < count; i++) {
        SoapObject result = (SoapObject) response.getProperty(i);
        DeleteuserDetails deleteuserDetails=new DeleteuserDetails();
        deleteuserDetails.setUserId(result.getPropertyAsString(4));
        deleteuserDetails.setUserName(result.getPropertyAsString(2));
        deleteuserDetails.setUserRole(result.getPropertyAsString(3));
        deleteuserDetails.setCreatedDate(result.getPropertyAsString(1));
        deleteuserDetails.setCreatedBy(result.getPropertyAsString(0));
        userdetail.add(deleteuserDetails);
    }

Now deleteuserDetails.setCreatedBy(result.getPropertyAsString(0)); gets null value from webservice, so I need to convert it into string "null".

LogCat:

12-20 18:48:52.608: W/System.err(2174): java.lang.NullPointerException
12-20 18:48:52.608: W/System.err(2174):     at org.ksoap2.serialization.SoapObject.getPropertyAsString(SoapObject.java:165)
12-20 18:48:52.608: W/System.err(2174):     at com.mvss.admin.Deleteuser$deteUserIdLoad.doInBackground(Deleteuser.java:81)
12-20 18:48:52.608: W/System.err(2174):     at com.mvss.admin.Deleteuser$deteUserIdLoad.doInBackground(Deleteuser.java:1)
12-20 18:48:52.608: W/System.err(2174):     at android.os.AsyncTask$2.call(AsyncTask.java:185)
12-20 18:48:52.608: W/System.err(2174):     at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:305)
12-20 18:48:52.608: W/System.err(2174):     at java.util.concurrent.FutureTask.run(FutureTask.java:137)
12-20 18:48:52.608: W/System.err(2174):     at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1068)
12-20 18:48:52.608: W/System.err(2174):     at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:561)
12-20 18:48:52.608: W/System.err(2174):     at java.lang.Thread.run(Thread.java:1096)

解决方案

Use this,

try {
    deleteuserDetails.setCreatedBy(result.getPropertyAsString(0).toString());
}
catch(Exception e) {
    deleteuserDetails.setCreatedBy("null");
}

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