无法从JSON获取最后一个值

时间:2013-07-10 12:48:35

标签: android arrays json eclipse string

我正在尝试从JSON API中获取所有价值,我已经成功获得了所有这些,除了一个!如您所见,这是服务器的JSON输出。 (我不能改变它)

{
   "error":"",
   "S8tf":{
      "infoToken":"wCfhXe",
      "deleteToken":"gzHTfGcF",
      "size":122484,
      "sha1":"8c4e2bbc0794d2bd4f901a36627e555c068a94e6",
      "filename":"Screen_Shot_2013-07-02_at_3.52.23_PM.png"
   },
   "S29N":{
      "infoToken":"joRm6p",
      "deleteToken":"IL5STLhq",
      "size":129332,
      "sha1":"b4a03897121d0320b82059c36f7a10a8ef4c113d",
      "filename":"Stockholmsyndromet.docx"
   }
}

正如您所看到的,每个字符串/“数组”都以“fileId”开头,这是从服务器中随机生成的。我正在使用下面的代码,我可以看到所有的值,如:文件名,大小,sh1等。但我似乎无法弄清楚如何获得“fileId”。 fileId是(在这个json中)S8tf和S29N

我的代码:

public class FilesActivity extends SherlockActivity {

    private static String TAG_FILENAME = "filename";
    private static String TAG_SIZE = "size";
    private static String TAG_ITOKEN = "infoToken";
    private static String TAG_DTOKEN = "deleteToken";
    private static String TAG_SHA1 = "sha1";

    private ListView lv;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.dblist);

        getSupportActionBar().setDisplayHomeAsUpEnabled(true);
        getSupportActionBar().setTitle("Files");

        String response = null;
        DefaultHttpClient httpClient = new DefaultHttpClient();
        ResponseHandler <String> resonseHandler = new BasicResponseHandler();
        HttpPost postMethod = new HttpPost("http://api.bayfiles.net/v1/account/files?session=of1903u3pj43c3can8rc33gc42");

        try {
            JSONObject json = new JSONObject();
               json.put("filename", "error");

               postMethod.setEntity(new ByteArrayEntity(json.toString().getBytes("UTF8")));
               postMethod.setHeader( "Content-Type", "application/json" );
               response = httpClient.execute(postMethod,resonseHandler);
               TextView txt = (TextView)findViewById(R.id.nodata);
               JSONObject request = new JSONObject(response);
               for (Iterator<?> keyIterator = request.keys(); keyIterator.hasNext(); ) {
                   String key = (String) keyIterator.next();
                   JSONObject object = request.optJSONObject(key);

                   ArrayList<fileObject> objectList = new ArrayList<fileObject>();
                   if (object != null) {
                       //Setting TAGs
                       TAG_FILENAME = object.getString("filename");
                       TAG_SIZE = object.getString("size");
                       TAG_ITOKEN = object.getString("infoToken");
                       TAG_DTOKEN = object.getString("deleteToken");
                       TAG_SHA1 = object.getString("sha1");            


                       txt.setText(
                               TAG_FILENAME + "\n"
                               + TAG_SIZE + "\n"
                               + TAG_ITOKEN + "\n"
                               + TAG_DTOKEN + "\n"
                               + TAG_SHA1 + "\n"
                               + txt.getText()
                               );                      

                       Log.d("log_tag", object.getString("filename"));
                   }
               }           
        }
        catch(Exception e)
        {      
            e.printStackTrace();
            Log.d("log_tag", "Error: " + e.toString());

        }
    }
}

如果你没有得到它,我试图抓住fileId又名S8tf和S29N的值,这些是随机数并由服务器生成。

编辑:感谢你们工作吧!因为我知道海报弄清楚它是令人恼火的,你不能,我做的是把String fileId = key;在我的对象循环中,像这样:

if (object != null) {
    fileObject obj = new fileObject();
    obj.setFileId(key);
    obj.setFileName(object.getString("filename"));
    obj.setSize(object.getString("size"));
    obj.setInfoToken(object.getString("infoToken"));
    obj.setDeleteToken(object.getString("deleteToken"));
    obj.setSha1(object.getString("sha1"));

    objectList.add(obj);
    Log.d("fileId", key); // Shows both of the values!
}

2 个答案:

答案 0 :(得分:2)

我刚看了JSONObject documentation

我觉得getNames()方法可能就是你要搜索的内容。

答案 1 :(得分:0)

如果你看一下for循环的第一部分......

JSONObject request = new JSONObject(response);

for (Iterator<?> keyIterator = request.keys(); keyIterator.hasNext(); ) {

         String key = (String) keyIterator.next();
         JSONObject object = request.optJSONObject(key);

您从JSONObject请求代表服务器响应的所有密钥。这些键是您要查找的值。如果你要添加

System.out.println(key);

在循环中的第一行之后,您将看到打印出的值('错误','S8tf',...)。