我正在尝试将Json数据检索到alertdialog中的微调器中，仅在微调器处于相同活动中时才加载，但如果它在alertDialog中，则会给我这个错误：
试图在空对象引用上调用虚拟方法'void android.widget.Spinner.setAdapter（android.widget.SpinnerAdapter）'
package exir.exir;
import android.app.ProgressDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.os.AsyncTask;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.design.widget.FloatingActionButton;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.app.AlertDialog;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.RelativeLayout;
import android.widget.Spinner;
import android.widget.SpinnerAdapter;
import android.widget.Toast;
import com.android.volley.AuthFailureError;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.io.BufferedReader;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import exir.exir.Helpers.FormAdapter;
import exir.exir.Helpers.PatientsAdapter;
import exir.exir.Helpers.PricrMAdapter;
import exir.exir.Helpers.RequestHandler;
import exir.exir.Helpers.SharedPrefManager;
import exir.exir.Rertofit.MyLabAPI;
import exir.exir.Utils.Constants;
import exir.exir.model.Form;
import exir.exir.model.PMenus;
import exir.exir.model.PriceM;
import exir.exir.model.RPatient;
import io.reactivex.android.schedulers.AndroidSchedulers;
import io.reactivex.disposables.CompositeDisposable;
import io.reactivex.functions.Consumer;
import io.reactivex.schedulers.Schedulers;
import static android.R.layout.simple_spinner_item;
public class AddPatient extends AppCompatActivity {
private EditText patientname, gender , age , agetype , tel ,
phone , total , notes , testno , testprice , testnotes , testname1 , testno1 , testprice1 , testnotes1 ;
private Button add ;
private String URLstring = "https://demonuts.com/Demonuts/JsonTest/Tennis/json_parsing.php";
String labId , labpriceMenuNO ;
private static ProgressDialog mProgressDialog;
private ArrayList<PMenus> goodModelArrayList;
private ArrayList<String> names = new ArrayList<String>();
private Spinner PmSpinner;
MyLabAPI myLabAPI ;
CompositeDisposable compositeDisposable = new CompositeDisposable();
List<PriceM> pricemenilist;
ArrayAdapter<String> adapter;
ListView FormList ;
EditText editThen , edtSdt;
Button btn_sua , btn_xoa , btn_then ;
ArrayList<Form> formArrayList ;
FormAdapter formAdapter;
FloatingActionButton newTest ;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_add_patient);
testno = (EditText)findViewById(R.id.testno);
testprice = (EditText)findViewById(R.id.testprice);
testnotes = (EditText)findViewById(R.id.testnotes);
newTest = (FloatingActionButton)findViewById(R.id.
newTest.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
showNewTestDialog();
}
});
myLabAPI = Constants.getAPI();
add =(Button)findViewById(R.id.addPatient);
}
private void showNewTestDialog() {
AlertDialog.Builder alertDialog = new
AlertDialog.Builder(AddPatient.this);
alertDialog.setTitle("Add New Test ");
alertDialog.setMessage("PLease fill the info ");
LayoutInflater inflater = this.getLayoutInflater();
View formLayout = inflater.inflate(R.layout.newtest_layout, null);
editThen = formLayout.findViewById(R.id.FName);
edtSdt = formLayout.findViewById(R.id.FPrice);
goodModelArrayList = new ArrayList<>();
PmSpinner = (Spinner)findViewById(R.id.testname);
PmSpinner.setAdapter(adapter);
PmSpinner.setOnItemSelectedListener(new
AdapterView.OnItemSelectedListener() {
@Override
public void onItemSelected(AdapterView<?> parent, View view, int
position, long id) {
String item = parent.getItemAtPosition(position).toString() ;
String testum = goodModelArrayList.get(position).getCity() ;
String price = goodModelArrayList.get(position).getCountry() ;
testnotes.setText(item);
testno.setText(testum);
testprice.setText(price);
}
@Override
public void onNothingSelected(AdapterView<?> adapterView) {
}
});
retrieveJSON();
alertDialog.setView(formLayout);
alertDialog.setIcon(R.drawable.ic_shopping_cart_black_24dp);
alertDialog.setPositiveButton("YES", new
DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
//some code
}
});
alertDialog.setNegativeButton("No", new
DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialogInterface, int i) {
dialogInterface.dismiss();
}
});
alertDialog.show();
}
private void retrieveJSON() {
StringRequest stringRequest = new StringRequest(
Request.Method.GET,
URLstring,
new Response.Listener<String>() {
@Override
public void onResponse(String response) {
Log.d("strrrrr", ">>" + response);
try {
JSONObject obj = new JSONObject(response);
goodModelArrayList = new ArrayList<>();
JSONArray dataArray = obj.getJSONArray("data");
for (int i = 0; i < dataArray.length(); i++) {
PMenus playerModel = new PMenus();
JSONObject dataobj =
dataArray.getJSONObject(i);
playerModel.setName(dataobj.getString("name"));
playerModel.setCountry(dataobj.getString("country"));
playerModel.setCity(dataobj.getString("city"));
playerModel.setImgURL(dataobj.getString("imgURL"));
goodModelArrayList.add(playerModel);
}
for (int i = 0; i < goodModelArrayList.size();
i++){
names.add(goodModelArrayList.get(i).getName().toString());
}
ArrayAdapter<String> spinnerArrayAdapter = new
ArrayAdapter<String>(AddPatient.this, simple_spinner_item, names);
spinnerArrayAdapter.setDropDownViewResource(
android.R.layout.simple_spinner_dropdown_item); // The drop down view
PmSpinner.setAdapter(spinnerArrayAdapter);
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
//displaying the error in toast if occurrs
Toast.makeText(getApplicationContext(),
error.getMessage(), Toast.LENGTH_SHORT).show();
}
});
// request queue
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(stringRequest);
}
答案 0 :(得分：0)
尝试一下.....
JSONObject c = JSONfunctions.getJSONfromURL("http://192.168.1.104/OnlineTicketBooking/book_now1.php?movieid='72'");
try {
JSONArray jarray = c.getJSONArray("offer_detail");
ArrayList<String> xyz= new ArrayList<String>();
for(int i = 0; i < jarray.length(); i++){
JSONArray timeArray = jarray.getJSONObject(i).getJSONArray("showtime");
for(int j = 0; j < timeArray .length(); j++){
xyz.add(timeArray .getString(j));
Log.d("get value",timeArray .getString(j));`enter code here`
}
}
答案 1 :(得分：0)
尝试类似以下代码：
public class SubMenu extends AppCompatActivity {
JSONObject jsonobject;
JSONArray jsonarray;
ListView listview;
ListViewAdapter adapter;
ProgressDialog mProgressDialog;
ArrayList<HashMap<String, String>> arraylist;
static String RANK = "id";
static String COUNTRY = "name";
static String FLAG = "image";
Integer i = 1;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_sub_menu);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
String SelectedId = getIntent().getStringExtra("id");
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
// Get the view from listview_main.xml
// Execute DownloadJSON AsyncTask
new DownloadJSON().execute();
}
// DownloadJSON AsyncTask
private class DownloadJSON extends AsyncTask<Void, Void, Void> implements AdapterView.OnItemClickListener {
// @Override
// protected void onPreExecute() {
// super.onPreExecute();
// Create a progressdialog
// mProgressDialog = new ProgressDialog(SubMenu.this);
// Set progressdialog title
// mProgressDialog.setTitle("Categories of Main categories.....");
// Set progressdialog message
// mProgressDialog.setMessage("Loading...");
// mProgressDialog.setIndeterminate(false);
// Show progressdialog
// mProgressDialog.show();
// }
@Override
protected Void doInBackground(Void... params) {
// Create an array
arraylist = new ArrayList<HashMap<String, String>>();
// Retrieve JSON Objects from the given URL address
jsonarray = JsonFunctions
.getJSONfromURL("http://cloud.granddubai.com/broccoli/menu_typeitem.php?id=" + getIntent().getStringExtra("id"));
try {
// Locate the array name in JSON
// jsonarray = jsonobject.getJSONArray("main_menu_items");
for (int i = 0; i < jsonarray.length(); i++) {
HashMap<String, String> map = new HashMap<String, String>();
jsonobject = jsonarray.getJSONObject(i);
// Retrive JSON Objects
// map.put("id", jsonobject.getString("id"));
map.put("name", jsonobject.getString("name"));
map.put("image", jsonobject.getString("image"));
// Set the JSON Objects into the array
arraylist.add(map);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void args) {
// Locate the listview in listview_main.xml
listview = (ListView) findViewById(R.id.list1);
// Pass the results into ListViewAdapter.java
adapter = new ListViewAdapter(SubMenu.this, arraylist);
// Set the adapter to the ListView
listview.setAdapter(adapter);
listview.setOnItemClickListener(this);
// Close the progressdialog
// mProgressDialog.dismiss();
}
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long rowId) {
final AlertDialog customDialog = new AlertDialog.Builder(SubMenu.this).create();
final LayoutInflater inflater = getLayoutInflater();
final View dialogView = inflater.inflate(R.layout.popup
, null);
customDialog.setView(dialogView);
// set the custom customDialogimation components - text, image and button
final TextView tvDistance = (TextView) dialogView.findViewById(R.id.h2);
// crust.setOnItemSelectedListener(this);
// public void addListenerOnSpinnerItemSelection() {
final Button ok = (Button) dialogView.findViewById(R.id.ok);
ok.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
customDialog.dismiss();
}
});
final Button cncl = (Button) dialogView.findViewById(R.id.canc);
cncl.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
customDialog.dismiss();
}
});
Button _decrease = (Button) dialogView.findViewById(R.id.incr);
Button _increase = (Button) dialogView.findViewById(R.id.decr);
Spinner spinner1 = (Spinner) dialogView.findViewById(R.id.crust);
Spinner spinner2 = (Spinner) dialogView.findViewById(R.id.adson);
ArrayList<String> alspinner1 = new ArrayList<>();
ArrayList<String> alspinner2 = new ArrayList<>();
final String[] _spvalue1 = getResources().getStringArray(R.array.Crust_array);
final String[] _spvalue2 = getResources().getStringArray(R.array.AddsOn_array);
for (int i = 0; i < _spvalue1.length; i++) {
alspinner1.add(_spvalue1[i]);
}
for (int i = 0; i < _spvalue2.length; i++) {
alspinner2.add(_spvalue2[i]);
}
ArrayAdapter<String> adapter1 = new ArrayAdapter<>(dialogView.getContext(), android.R.layout.simple_spinner_item, alspinner1);
ArrayAdapter<String> adapter2 = new ArrayAdapter<>(dialogView.getContext(), android.R.layout.simple_spinner_item, alspinner2);
adapter1.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
adapter2.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
spinner1.setAdapter(adapter1);
spinner2.setAdapter(adapter2);
final TextView _value = (TextView) dialogView.findViewById(R.id.value);
i = Integer.parseInt(_value.getText().toString());
_decrease.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
String _stringVal;
Log.d("src", "Decreasing value...");
if (i > 0) {
i = i - 1;
_stringVal = String.valueOf(i);
_value.setText(_stringVal);
} else {
Log.d("src", "Value can't be less than 0");
}
}
});
_increase.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
String _stringVal;
Log.d("src", "Increasing value...");
i = i + 1;
_stringVal = String.valueOf(i);
_value.setText(_stringVal);
}
});
customDialog.show();
}
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case android.R.id.home:
onBackPressed();
return true;
default:
return super.onOptionsItemSelected(item);
}
}
}
我为我的应用程序尝试了相同的概念，并且此代码在这里起作用。您可以从中寻求帮助。谢谢！！