在MainActivity.java行的66-74中，我获得了在recyclerView中单击的项目的位置，并使用它从url获取当前的JSON并传递url中的news_detail.java到putExtra，在doInBackground中AsyncTask内的news_detail.java方法中，url并不不会随着每次点击而更新，它正在使用recyclerView.
中的第一项
有什么方法可以解决这个问题，如果还有其他方法可以解决这个问题，请我真诚地知道
MainActivity.java
package wami.ikechukwu.kanu;
import android.app.AlertDialog;
import android.content.Intent;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
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.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import dmax.dialog.SpotsDialog;
public class MainActivity extends AppCompatActivity implements newsAdapter.onclicklistener {
private final String KEY_AUTHOR = "author";
private final String KEY_TITLE = "title";
private final String KEY_DESCRIPTION = "description";
private final String KEY_URL = "url";
private final String KEY_URL_TO_IMAGE = "urlToImage";
private final String KEY_PUBLISHED_AT = "publishedAt";
//this string is appended to the url
String urlLink = "buhari";
String url;
int mPosition;
ArrayList<dataModel> list;
private RecyclerView recyclerView;
private newsAdapter mAdapter;
private RecyclerView.LayoutManager mLayout;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
getSupportActionBar().hide();
setContentView(R.layout.activity_main);
list = new ArrayList<>();
recyclerView = findViewById(R.id.recyclerView);
mAdapter = new newsAdapter(this, list, this);
mLayout = new LinearLayoutManager(this);
recyclerView.setLayoutManager(mLayout);
recyclerView.setAdapter(mAdapter);
jsonParser();
}
@Override
public void onItemClick(int position) {
mPosition = position;
Intent intent = new Intent(this, news_detail.class);
intent.putExtra("POSITION", position);
intent.putExtra("URL", url);
startActivity(intent);
}
private void jsonParser() {
final AlertDialog progressDialog = new SpotsDialog(this, R.style.customProgressDialog);
progressDialog.show();
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, "https://newsapi.org/v2/everything?q=" + urlLink + "&language=en&sortBy=publishedAt&pageSize=100&apiKey=a5f976b34089493abc8f97f088e5df64", null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
try {
JSONArray jsonArray = response.getJSONArray("articles");
//Using a for loop to get the object (data) in the JSON
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObject = jsonArray.getJSONObject(i);
JSONObject JO = jsonArray.getJSONObject(mPosition);
dataModel dataModel = new dataModel();
dataModel.setTitle(jsonObject.getString(KEY_TITLE));
dataModel.setImage(jsonObject.getString(KEY_URL_TO_IMAGE));
dataModel.setDescrip(jsonObject.getString(KEY_DESCRIPTION));
url = JO.getString(KEY_URL);
list.add(dataModel);
}
} catch (JSONException e) {
e.printStackTrace();
}
mAdapter.notifyDataSetChanged();
progressDialog.dismiss();
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
Log.e("Volley", error.toString());
progressDialog.dismiss();
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonObjectRequest);
}
}
news_detail.java
package wami.ikechukwu.kanu;
import android.os.AsyncTask;
import android.os.Build;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.widget.ImageView;
import android.widget.TextView;
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.JsonObjectRequest;
import com.android.volley.toolbox.Volley;
import com.bumptech.glide.Glide;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import java.io.IOException;
public class news_detail extends AppCompatActivity {
//TODO: REMOVE THE UNUSED LINE IF THERE IS NO NEED FOR THEM IN THE APP
//THESE VARIABLE ARE USED TO GET THE MATCHING RESPONSE FROM THE JSON FROM THE API
// private final String KEY_AUTHOR = "author";
private final String KEY_TITLE = "title";
//private final String KEY_DESCRIPTION = "description";
private final String KEY_URL = "url";
private final String KEY_URL_TO_IMAGE = "urlToImage";
private final String KEY_PUBLISHED_AT = "publishedAt";
//THIS VARIABLE HOLD THE POSITION (NUMBER/INTEGER) OF THE ITEM CLICKED IN THE RECYCLERVIEW
int itemPosition;
//THIS STRING IS APPENDED TO THE URL OF THE API AND IS THE MAIN KEYWORD BEING SEARCHED FOR
String urlLink = "buhari";
//THIS STRING IS INTENDED TO HOLD THE URL FROM THE JSON -WHICH IS USED OPEN EACH INDIVIDUAL
// NEWS PAGE
String news_url;
//INSTANCE OF THE XML VIEWS
TextView newsDetail_Title, newDetail_Time_Posted, newsDetail_News;
ImageView newsDetail_Image;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_news_detail);
//GET THE POSITION (NUMBER) OF THE ITEM IN THE RECYCLERVIEW THAT WAS CLICKED IN THE MAIN
// ACTIVITY
itemPosition = getIntent().getIntExtra("POSITION", 0);
news_url = getIntent().getStringExtra("URL");
//GET THE INSTANCE OF THE VIEW
newsDetail_Title = findViewById(R.id.newsDetail_Title);
newDetail_Time_Posted = findViewById(R.id.newDetail_Time_Posted);
newsDetail_News = findViewById(R.id.newsDetail_News);
newsDetail_Image = findViewById(R.id.newsDetail_Image);
//CALL THE METHOD THAT DOES ALL THE WORK IN THIS ACTIVITY
newsRequest();
new experiment().execute();
}
public void newsRequest() {
//USING VOLLEY TO CREATE AN INTERNET CONNECTION AND PARSE THE JSON
JsonObjectRequest jsonObjectRequest = new JsonObjectRequest(Request.Method.GET, "https://newsapi.org/v2/everything?q=" + urlLink + "&language=en&sortBy=publishedAt&pageSize=100&apiKey=a5f976b34089493abc8f97f088e5df64", null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
//I HAD TO SURROUND THIS IN A TRY AND CATCH STATEMENT TO AVOID THE APP CRASHING
try {
//GETTING THR ARRAY IN THE JSON THAT HOLD OTHER OBJECT/ARRAY
JSONArray jsonArray = response.getJSONArray("articles");
//USING A FOR-LOOP TI GET THE OBJECT (DATA) IN THE JSON
JSONObject jsonObject = jsonArray.getJSONObject(itemPosition);
//SET THE TEXT IN THE XML TO THAT OF THE TITLE FROM THE JSON RESPONSE
newsDetail_Title.setText(jsonObject.getString(KEY_TITLE));
//news_url = jsonObject.getString(KEY_URL);
//newsDetail_News.setText(news_url);
Glide.with(getApplicationContext()).load(jsonObject.getString(KEY_URL_TO_IMAGE)).into(newsDetail_Image);
} catch (JSONException e) {
e.printStackTrace();
}
}
}, new Response.ErrorListener() {
@Override
public void onErrorResponse(VolleyError error) {
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonObjectRequest);
///////////////////////////////////////////////////////////////////////////////////////////////////
}
public class experiment extends AsyncTask<Void, Void, Void> {
String title;
@Override
protected void onPreExecute() {
super.onPreExecute();
}
@Override
protected Void doInBackground(Void... voids) {
try {
String newUrl;
if (!news_url.contains("http")) {
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.P) {
newUrl = "https://" + news_url;
} else {
newUrl = "http" + news_url;
}
} else {
newUrl = news_url;
}
Document document =
Jsoup.connect(newUrl).followRedirects(true).timeout(600000).get();
/* Elements element = document.select("p");
for (Element paragraph : element) {
builder.append(paragraph.text());
}
*/
title = document.title();
} catch (IOException e) {
e.printStackTrace();
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
super.onPostExecute(aVoid);
newsDetail_News.setText(title);
}
}
}
答案 0 :(得分：0)
在获得响应并在列表中填写数据后设置适配器：
list.add(dataModel);
//set adapter after this above line
mAdapter = new newsAdapter(this, list, this);
要获取url，您还必须在位置之后传递url作为参数，使监听器如下所示：
onItemClick(int position, String url)