從Android返回字符串

Question

我有一個問題：我使用Web服務來返回一些值，但有些時候一些問題面臨的Web服務，當我想顯示他們我的應用程序崩潰，所以我想使肯定，如果沒有什麼表現，然後只返回空的空間，我用它JSON，有我的代碼的一部分，如果有人能幫助我，

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()); 
     } 

這是發生了什麼事，當我努力它給出錯誤信息

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

沒有值

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

如果我沒有誤解你而不是jsonArticle.getString你可以使用jsonArticle.optString。如果json不包含該密鑰，它將返回一個空的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該文檔爲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; 
}