我有一个问题。我没有将 JSONArray 设置为 Spinner。我的 JSON 看起来 ["category1","category2","category3"]
如何将此 JSONArray 获取到微调器?不知道我的代码好不好
public class Main extends Activity {
String urlCat = "http://tvapp.pcrevue.sk/categories.json";
@Override
public void onCreate(Bundle icicle) {
super.onCreate(icicle);
JSONArray jsonArray = getJSONArrayFromUrl(urlCat);
final ActionBar actionBar = getActionBar();
actionBar.setNavigationMode(ActionBar.NAVIGATION_MODE_LIST);
actionBar.setDisplayShowTitleEnabled(false);
actionBar.setDisplayUseLogoEnabled(false);
ArrayAdapter<String> spinnerMenu = new ArrayAdapter<String>(actionBar.getThemedContext(), android.R.layout.simple_list_item_1, jsonArray);
actionBar.setListNavigationCallbacks(spinnerMenu,
new ActionBar.OnNavigationListener() {
@Override
public boolean onNavigationItemSelected(int itemPosition, long itemId) {
FragmentTransaction tx = getFragmentManager().beginTransaction();
switch (itemPosition) {
case 0:
tx.replace(android.R.id.content, new Tab1Fragment());
break;
case 1:
tx.replace(android.R.id.content, new Tab2Fragment());
break;
default:
break;
}
tx.commit();
return false;
}
});
}
public JSONArray getJSONArrayFromUrl(String url) {
InputStream is = null;
JSONArray jObj = null;
String json = "";
// Making HTTP request
try {
// defaultHttpClient
DefaultHttpClient httpClient = new DefaultHttpClient();
HttpGet httpGet = new HttpGet(url);
HttpResponse httpResponse = httpClient.execute(httpGet);
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"));
StringBuilder sb = new StringBuilder();
String line = null;
while ((line = reader.readLine()) != null) {
//json += line;
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 JSONArray(json);
} catch (JSONException e) {
Log.e("JSON Parser", "Error parsing data " + e.toString());
}
// return JSON String
return jObj;
}
}
我需要你的帮助。 谢谢
最佳答案
我在 ArrayAdapter 中找不到任何接受 JSONArray 对象的构造函数,如果您有任何疑问,请参阅 Array Adapter .
您需要传递列表而不是 JSONArray。 并且, 您正在执行 UI 线程的网络操作,因此您将获得 NetworkOnMainThread 异常。低版本没问题,但高版本会抛出异常。尝试使用 AsyncTask 获取值或使用 Separate Thread
所以得到这样的列表
ArrayList<String> list = new ArrayList<String>();
for(int i=0; i<jsonArray.length(); i++) {
list.add(jsonArray.getString(i));
}
ArrayAdapter<String> spinnerMenu = new ArrayAdapter<String>(actionBar.getThemedContext(), android.R.layout.simple_list_item_1, list);
关于android - JSONArray 到 Spinner,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/15462031/