Question

我正在尝试从http://inspirontrance.com/app.php解析JSON数组，但它无效。我相信我的代码可能存在问题，或者url只是重定向到defaultHttpClient不支持的另一个url。

查看我的代码，

Android解析活动类

public class AndroidJSONParsingActivity extends ListActivity {

    private static String url = "http://www.inspirontrance.com/app";

    private static final String TAG_UPLOADS = "uploads";
    private static final String TAG_ID = "id";
    private static final String TAG_NAME = "name";
    private static final String TAG_DATE = "date";
    private static final String TAG_UPLOAD_NO = "0";

    JSONArray uploads = null;

    @Override
    public void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.main);

        ArrayList<HashMap<String, String>> uploads_list = new ArrayList<HashMap<String, String>>();

        JSONParser jParser = new JSONParser();

        JSONObject json = jParser.getJSONFromUrl(url);

        try {
            uploads = json.getJSONArray(TAG_UPLOADS);

            for (int i = 0; i < uploads.length(); i++) {
                JSONObject c = uploads.getJSONObject(i);

                JSONObject upload_no = c.getJSONObject(TAG_UPLOAD_NO);
                String name = upload_no.getString(TAG_NAME);

                HashMap<String, String> map = new HashMap<String, String>();

                map.put(TAG_NAME, name);

                uploads_list.add(map);
            }
        } catch (JSONException e) {
            e.printStackTrace();
        }

        ListAdapter adapter = new SimpleAdapter(this, uploads_list,
                R.layout.list_item, new String[] { TAG_NAME },
                new int[] { R.id.name });

        setListAdapter(adapter);

    }

}

JSON Parser Class

public class JSONParser {

    static InputStream is = null;
    static JSONObject jObj = null;
    static String json = "";

    // constructor
    public JSONParser() {

    }

    public JSONObject getJSONFromUrl(String url) {

        // Making HTTP request
        try {
            // defaultHttpClient
            DefaultHttpClient httpClient = new DefaultHttpClient();
            HttpPost httpPost = new HttpPost(url);

            HttpResponse httpResponse = httpClient.execute(httpPost);
            HttpEntity httpEntity = httpResponse.getEntity();
            is = httpEntity.getContent();           

        } catch (UnsupportedEncodingException e) {
            e.printStackTrace();
        } catch (ClientProtocolException e) {
            e.printStackTrace();
        } catch (IOException e) {
            e.printStackTrace();
        }

        try {
            BufferedReader reader = new BufferedReader(new InputStreamReader(
                    is, "iso-8859-1"), 8);
            StringBuilder sb = new StringBuilder();
            String line = null;
            while ((line = reader.readLine()) != null) {
                sb.append(line + "\n");
            }
            is.close();
            json = sb.toString();
        } catch (Exception e) {
            Log.e("Buffer Error", "Error converting result " + e.toString());
        }

        // try parse the string to a JSON object
        try {
            jObj = new JSONObject(json);
        } catch (JSONException e) {
            Log.e("JSON Parser", "Error parsing data " + e.toString());
        }

        // return JSON String
        return jObj;

    }
}

Answer 1

您的问题的答案在堆栈跟踪中说明：

您的内容必须包含一个ListView，其id属性为'android.R.id.list'

相应的活动似乎是扩展ListActivity的AndroidJSONParsingActivity。 ListActivity会自动执行许多操作，并假设您的布局（在您的情况下为R.layout.main）包含带有android.R.id.list的ListView。

检查您的main布局并确保您拥有这样的ListView：

<ListView 
    android:id="@android:id/list" 
    [...]
    />

从Android中的自动定向网址解析此特定JSON

1 个答案: