我正在使用volley.jar从远程服务器获取JSON数组。能够通过GET请求获取。请帮我处理POST请求
我正在关注androidhive的教程。
这是我的工作代码。
public class fbuk extends Activity {
// Movies json url
private static final String url = "http://example.com/xyz.php?q=ram";
private ProgressDialog pDialog;
private List<Movie> movieList = new ArrayList<Movie>();
private ListView listView;
private CustomListAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.listview_main);
listView = (ListView) findViewById(R.id.listview);
adapter = new CustomListAdapter(this, movieList);
listView.setAdapter(adapter);
pDialog = new ProgressDialog(this);
// Showing progress dialog before making http request
pDialog.setMessage("Loading...");
pDialog.show();
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("ttl"));
movie.setThumbnailUrl(obj.getString("img"));
movie.setRating(obj.getString("stts"));
movie.setYear(obj.getString("relz"));
movieList.add(movie);
} catch (JSONException e) {
e.printStackTrace();
}
}
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);
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
}
如何发送参数
答案 0 :(得分：1)
public void Post(String url, final Map<String, String> map) {
showProgress();
RequestQueue queue = Volley.newRequestQueue(_serverctx);
StringRequest request = new StringRequest(Method.POST, url, new Response.Listener<String>() {
@Override
public void onResponse(String response) {
if (response!=null && response.length()>0) {
try {
_response.result(new JSONObject(response)); // Pass data to your parsing method(in my case i made a interface)
} catch (JSONException e) {
e.printStackTrace();
}
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
System.out.println("error");
hideProgres();
}
}){
@Override
protected Map<String, String> getParams() {
return map;
}
@Override
public Map<String, String> getHeaders() throws AuthFailureError {
Map<String,String> params = new HashMap<String, String>();
params.put("Content-Type","application/x-www-form-urlencoded");
return params;
}
};
request.setShouldCache(false);
request.setRetryPolicy(new DefaultRetryPolicy(20 * 1000, 1, 1.0f));
queue.add(request);
}
将上述方法放在一个单独的类中并发出类似
的调用Map<String,String> params = new HashMap<String, String>();
params.put("email",email);
params.put("password",password);
_req = new NetworkRequests(this, ctx);
_req.Post(ShoqahContants.Login_URL, params);
你完成了：）
答案 1 :(得分：1)
这对我有用。
pDialog = new ProgressDialog(this);
pDialog.setMessage("Loading...");
pDialog.show();
url="http://www.example.com/xyz.php";
Volley.newRequestQueue(your_activity.this).add(
new CustomJsonRequest(Request.Method.POST, url, null,
new Response.Listener<JSONArray>() {
@Override
public void onResponse(JSONArray response) {
hidePDialog();
// Parsing json
for (int i = 0; i < response.length(); i++) {
try {
JSONObject obj = response.getJSONObject(i);
GC gc = new GC();
gc.setTitl(obj.getString("ttl"));
} catch (JSONException e) {
e.printStackTrace();
}
}
adapter.notifyDataSetChanged();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d("Error: " + error.getMessage());
hidePDialog();
}
}) {
@Override
protected Response<JSONArray> parseNetworkResponse(
NetworkResponse response) {
try {
String jsonString = new String(response.data,
HttpHeaderParser
.parseCharset(response.headers));
return Response.success(new JSONArray(jsonString),
HttpHeaderParser
.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JSONException je) {
return Response.error(new ParseError(je));
}
}
});
}
@Override
public void onDestroy() {
super.onDestroy();
hidePDialog();
}
private void hidePDialog() {
if (pDialog != null) {
pDialog.dismiss();
pDialog = null;
}
}
public class CustomJsonRequest extends Request {
Map<String, String> params;
private Response.Listener listener;
public CustomJsonRequest(int requestMethod, String url, Map<String, String> params,
Response.Listener responseListener, Response.ErrorListener errorListener) {
super(requestMethod, url, errorListener);
params=new HashMap<String, String>();
params.put("key", value);
this.params = params;
this.listener = responseListener;
}
@Override
protected void deliverResponse(Object response) {
listener.onResponse(response);
}
@Override
public Map<String, String> getParams() throws AuthFailureError {
return params;
}
@Override
protected Response parseNetworkResponse(NetworkResponse response) {
try {
String jsonString = new String(response.data, HttpHeaderParser.parseCharset(response.headers));
return Response.success(new JSONObject(jsonString),
HttpHeaderParser.parseCacheHeaders(response));
} catch (UnsupportedEncodingException e) {
return Response.error(new ParseError(e));
} catch (JSONException je) {
return Response.error(new ParseError(je));
}
}
p.s：json必须采用以下格式
[{"titl":"The Great gatsby"},{"titl":"Wolf Of Wall Street"}]