我无法在oncreateview中分配url字符串，因为它是静态final，如果我将其更改为static并将其声明为oncreateview，它会在编译时分配并且没有错误显示但是运行时可能是因为http请求在其他线程上运行无法获取oncreateview中指定的网址。我想要 可以更改URL的代码。在获取url字符串时，http请求在url字符串中运行时没有任何null异常
package com.celebrations.kishan.fragments;
public class FiveFragment extends Fragment {
private static final String TAG = "Five activity";
private static final String url = "http://111.111.11.111/celebrations/cab.php";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private ListView listView;
private CustomListAdapter adapter;
private int datasql8=0;
public FiveFragment() {
// Required empty public constructor
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
FragmentActivity faActivity = (FragmentActivity) super.getActivity();
// Replace LinearLayout by the type of the root element of the layout you're trying to load
RelativeLayout rlLayout = (RelativeLayout) inflater.inflate(R.layout.fragment_eight, container, false);
// Inflate the layout for this fragment
listView = (ListView) rlLayout.findViewById(R.id.list);
adapter = new CustomListAdapter(super.getActivity(), movieList);
listView.setAdapter(adapter);
final SharedPreferences preferences = this.getActivity().getSharedPreferences("pref", Context.MODE_PRIVATE);
final SharedPreferences.Editor edt = preferences.edit();
pDialog = new ProgressDialog(super.getActivity());
// Showing progress dialog before making http request
pDialog.setMessage("Celebrating...");
pDialog.show();
//
JsonArrayRequest下面的代码（url，new Response.Listener（）
网址应该是静态和字符串
// Creating volley request obj
JsonArrayRequest movieReq = new JsonArrayRequest(url,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
Log.d(TAG, response.toString());
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
Movie movie = new Movie();
movie.setTitle(obj.getString("title"));
movie.setThumbnailUrl(obj.getString("image"));
movie.setRating(((Number) obj.get("rating"))
.doubleValue());
movie.setYear(obj.getInt("releaseYear"));
// Genre is json array
//JSONArray genreArry = obj.getJSONArray("genre");
ArrayList<String> genre = new ArrayList<String>();
for (int j = 0; j < 1; j++) {
genre.add("Certified");
}
movie.setGenre(genre);
if((preferences.getString("dataf8", "empty")).equals("empty"))
{
if(isOnline()==true)
{ Toast.makeText(getActivity(),"null online",Toast.LENGTH_LONG).show();
edt.putString("dataf8","stored");
edt.commit();
try {
MainActivity.dbs.execSQL("insert into tableeight values('" + obj.getString("title") + "','" + obj.getString("image") + "'," + ((Number) obj.get("rating"))
.doubleValue() + "," + obj.getInt("releaseYear") + ")");
}catch(Exception ae)
{
Toast.makeText(getActivity(),ae.getMessage().toString(),Toast.LENGTH_LONG).show();
}
}
else
{
Toast.makeText(getActivity(),"Connect To Internet",Toast.LENGTH_SHORT).show();
}
}
else
{
if(isOnline()==true)
{// Toast.makeText(getActivity(),"full fresh insert online"+i,Toast.LENGTH_SHORT).show();
try {
MainActivity.dbs.execSQL("insert into tableeight values('Work online','" + obj.getString("image") + "'," + ((Number) obj.get("rating"))
.doubleValue() + "," + obj.getInt("releaseYear") + ")");
}catch(Exception ae)
{
Toast.makeText(getActivity(),ae.getMessage().toString(),Toast.LENGTH_LONG).show();
}
}else
{ //Toast.makeText(getActivity(),"old put offline",Toast.LENGTH_LONG).show();
try
{
Cursor point=MainActivity.dbs.rawQuery("select * from tableeight",null);
point.moveToFirst();
do {
movie.setTitle(point.getString(0));
movie.setThumbnailUrl(point.getBlob(1).toString());
movie.setRating(((Number) point.getDouble(2))
.doubleValue());
movie.setYear(point.getInt(3));
for (int j = 0; j < 1; j++) {
genre.add("Certified");
}
movie.setGenre(genre);
}while(point.moveToNext());
}
catch (Exception ea)
{
Toast.makeText(getActivity(),ea.getMessage().toString(),Toast.LENGTH_LONG).show();
}
}
}
// adding movie to movies array
movieList.add(movie);
listView.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView parent, View view, int position, long id) {
Movie o = (Movie) parent.getItemAtPosition(position);
Toast.makeText(getActivity(), o.getTitle().toString(), Toast.LENGTH_SHORT).show();
Intent intent = new Intent(getActivity(),Details.class);
intent.putExtra("Key", o.getTitle().toString());
startActivity(intent);
}
});
} catch (JSONException e) {
e.printStackTrace();
}
}
// notifying list adapter about data changes
// so that it renders the list view with updated data
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "Error: " + error.getMessage());
hidePDialog();
}
});
// Adding request to request queue
AppController.getInstance().addToRequestQueue(movieReq);
return rlLayout ;
}public boolean isOnline() {
ConnectivityManager cm =
(ConnectivityManager) getActivity().getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo netInfo = cm.getActiveNetworkInfo();
return netInfo != null && netInfo.isConnectedOrConnecting();
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
super.onCreateOptionsMenu(menu, inflater);
}
}
答案 0 :(得分：1)
您已在代码中使用intent.putExtra。为什么不使用相同的方法传递URL？
Intent intent = new Intent(getActivity(),Details.class);
intent.putExtra("Key", o.getTitle().toString());
intent.putExtra("URL", url);
startActivity(intent);
编辑1：
如果您想更改网址，可以将其保存（可能是）SharedPreferences并随时读取/写入。
编辑2：
您可以创建一个单独的类来存储网址。像这样：
public class MyUrls{
public static String url1 = "http://www.example.com/api/";
// some more urls, if any.
}
现在，请在任何地方使用MyUrls.url1。你也可以更新它。