从Android返回字符串

Question

我有一个问题：我使用Web服务来返回一些值，但有些时候一些问题面临的Web服务，当我想显示他们我的应用程序崩溃，所以我想使肯定，如果没有什么表现，然后只返回空的空间，我用它JSON，有我的代码的一部分，如果有人能帮助我，

public static Article parseArticle(JSONObject jsonArticle) { 

     Article article = new Article(); 

     try { 
      article.setTitle(ArabicUtilities.reshape(Html.fromHtml(jsonArticle.getString("title")).toString())); 
      article.setExcerpt(ArabicUtilities.reshape(Html.fromHtml(jsonArticle.getString("excerpt")).toString())); 
      article.setContent(ArabicUtilities.reshape(Html.fromHtml(jsonArticle.getString("content")).toString())); 
      article.setDate(jsonArticle.getString("date")); 


      return article; 
     } catch (JSONException e) { 
      e.printStackTrace(); 
      return null; 
     } 
    } 

private void loadinfo() { 

     { 
      programs = JSONParser.parseProgram(savedData); 
      txt1.setText(article.get(1).getTitle()); 
      txt2.setText(article.get(0).getTitle()); 
      txt3.setText(article.get(1).excerpt()); 
      txt4.setText(article.get(0).excerpt()); 
      txt5.setText(article.get(1).content()); 
      txt6.setText(article.get(0).content()); 
      txt7.setText(article.get(1).date()); 
      txt8.setText(article.get(0).date()); 
     } 

这是发生了什么事，当我努力它给出错误信息

 txt1.setText(article.get(1).getTitle()); 

没有值

Answer 1

public static Article parseArticle(JSONObject jsonArticle) { 
    Article article = new Article(); 
    if(null!=jsonArticle){ 
     try { 
      /*your code */ 
    }else{ 
     article.setTitle(ArabicUtilities.reshape(""); 
     article.setExcerpt(ArabicUtilities.reshape(""); 
     article.setContent(ArabicUtilities.reshape(""); 
     article.setDate(""); 
     return article; 
     } 
    } 

Answer 2

如果我没有误解你而不是jsonArticle.getString你可以使用jsonArticle.optString。如果json不包含该密钥，它将返回一个空的String。

String mString = jsonArticle.optString("title"); 
article.setTitle(ArabicUtilities.reshape(Html.fromHtml(mString).toString())); 
mString = jsonArticle.optString("excerpt");     
article.setExcerpt(ArabicUtilities.reshape(Html.fromHtml(mString).toString())); 
mString = jsonArticle.optString("content");      
article.setContent(ArabicUtilities.reshape(Html.fromHtml(mString).toString())); 
mString = jsonArticle.optString("date");    
article.setDate(mString); 

here该文档为optString()

EDIT

public static Article parseArticle(JSONObject jsonArticle) { 

    Article article = new Article(); 

    try { 
      String mString = jsonArticle.optString("title"); 
      article.setTitle(ArabicUtilities.reshape(Html.fromHtml(mString).toString())); 
      mString = jsonArticle.optString("excerpt");     
      article.setExcerpt(ArabicUtilities.reshape(Html.fromHtml(mString).toString())); 
      mString = jsonArticle.optString("content");      
      article.setContent(ArabicUtilities.reshape(Html.fromHtml(mString).toString())); 
      mString = jsonArticle.optString("date");    
      article.setDate(mString); 
    } catch (JSONException e) { 
     e.printStackTrace(); 
    } 

     return article; 
}