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Я получаю дубликат записи, когда я использую swipe refreshlayout с json. Я добавляю снимок экрана после обновления обновления салфетки.Listview Duplicate entry with SwipeRefreshLayout
Когда я использую userArray.clear();, так что он отлично работает, но listview блистает некоторое время. Я думаю, что есть решение для теста, для которого очень ценят Спасибо.
см. Эту ссылку. Я хочу выглядеть как this без мигающего списка.
MainActivity.java
import android.content.ActivityNotFoundException;
import android.content.Intent;
import android.net.Uri;
import android.os.AsyncTask;
import android.os.Bundle;
import java.io.File;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.os.Environment;
import android.support.v4.widget.SwipeRefreshLayout;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import android.widget.AdapterView.OnItemClickListener;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
/**
* Created by Arpit Patel on 08-Apr-16.
*/
public class MainActivity extends Activity implements SwipeRefreshLayout.OnRefreshListener{
ListView userList;
UserCustomAdapter userAdapter=null;
ArrayList<User> userArray = new ArrayList<User>();
Button bt_view;
TextView tv_empty;
private SwipeRefreshLayout swipeRefreshLayout;
static List<String> all_pdf;
// URL to get contacts JSON
private static String url = "http://api.androidhive.info/songs/albums.php";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
swipeRefreshLayout = (SwipeRefreshLayout) findViewById(R.id.swipe_refresh_layout);
bt_view = (Button) findViewById(R.id.bt_view);
userList = (ListView) findViewById(R.id.listView);
tv_empty= (TextView)findViewById(R.id.tv_empty);
// set item into adapter
userAdapter = new UserCustomAdapter(MainActivity.this, R.layout.row_item,
userArray);
userList.setAdapter(userAdapter);
swipeRefreshLayout.setOnRefreshListener(this);
/**
* Showing Swipe Refresh animation on activity create
* As animation won't start on onCreate, post runnable is used
*/
swipeRefreshLayout.post(new Runnable() {
@Override
public void run() {
swipeRefreshLayout.setRefreshing(true);
Log.d("Runnable method ", "");
new GetPapers().execute();
}
}
);
/**
* get on item click listener
*/
userList.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View v,
final int position, long id) {
TextView tv_paper_name = (TextView) v.findViewById(R.id.tv_paper_name);
String PaperName = tv_paper_name.getText().toString();
File extStore = Environment.getExternalStorageDirectory();
File myFile = new File(extStore.getAbsolutePath() + "/Exam Papers/" + PaperName + ".pdf");
if (myFile.exists()) {
File pdfFile = new File(Environment.getExternalStorageDirectory() + "/Exam Papers/" + PaperName + ".pdf"); // -> filename
Uri path = Uri.fromFile(pdfFile);
Intent pdfIntent = new Intent(Intent.ACTION_VIEW);
pdfIntent.setDataAndType(path, "application/pdf");
pdfIntent.setFlags(Intent.FLAG_ACTIVITY_CLEAR_TOP);
try {
startActivity(pdfIntent);
} catch (ActivityNotFoundException e) {
Toast.makeText(MainActivity.this, "No Application available to view PDF", Toast.LENGTH_SHORT).show();
}
} else {
Toast.makeText(MainActivity.this, "Download file first", Toast.LENGTH_SHORT).show();
}
}
});
bt_view.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
try {
String folder_path = Environment.getExternalStorageDirectory().getAbsolutePath() + "/Exam Papers/";
all_pdf = new ArrayList<String>();
all_pdf = textFiles(folder_path);
Log.d("All files ", " " + all_pdf);
} catch (Exception e) {
e.printStackTrace();
}
Intent intent = new Intent(MainActivity.this, ActivityTwo.class);
startActivity(intent);
}
});
}
/**
* This method is called when swipe refresh is pulled down
*/
@Override
public void onRefresh() {
Log.d("onRefresh()", "");
new GetPapers().execute();
}
//For fetch the all pdf file in one Directory
List<String> textFiles(String directory) {
List<String> textFiles = new ArrayList<String>();
File dir = new File(directory);
for (File file : dir.listFiles()) {
if (file.getName().endsWith((".pdf"))) {
textFiles.add(file.getName());
}
}
return textFiles;
}
/**
* Async task class to get json by making HTTP call
* */
private class GetPapers extends AsyncTask<Void, Void, Void> {
String Response;
@Override
protected void onPreExecute() {
super.onPreExecute();
// showing refresh animation before making http call
swipeRefreshLayout.setRefreshing(true);
// userArray.clear();
}
@Override
protected Void doInBackground(Void... arg0) {
// Creating service handler class instance
JSONParser sh = new JSONParser();
// Making a request to url and getting response
Response = sh.makeServiceCall(url);
return null;
}
@Override
protected void onPostExecute(Void result) {
super.onPostExecute(result);
if (Response != null) {
try {
JSONArray jsonArray = new JSONArray(Response);
for (int i = 0; i < jsonArray.length(); i++){
JSONObject jsonObject = jsonArray.getJSONObject(i);
String PaperName = jsonObject.getString("name");
String Conts = jsonObject.getString("songs_count");
String id = jsonObject.getString("id");
/**
* add item in arraylist
*/
userArray.add(new User(PaperName, Conts, id));
}
} catch (JSONException e) {
e.printStackTrace();
}
} else {
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
Log.e("ServiceHandler", "Couldn't get any data from the url");
}
// userAdapter.notifyDataSetChanged();
// stopping swipe refresh
userAdapter = new UserCustomAdapter(MainActivity.this, R.layout.row_item,
userArray);
userList.setAdapter(userAdapter);
// stopping swipe refresh
swipeRefreshLayout.setRefreshing(false);
}
}
}
Почему -1, пожалуйста, объясните причину Я сделал что-то неправильно? –
Извините, я опоздал, позвольте мне проверить. –