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我最近開始寫一個應用程序，讓我從論壇獲取信息。我用JSoup庫來抓取數據。我的第一部分進展順利。使用viewpager與不同的片段？
當應用程序打開時，它只從網站（子論壇名稱）獲取數據並將其傳遞，以便listview能夠顯示它們。當我在列表視圖中按下一個項目時，它只是在子論壇中獲取線程列表。除了listview沒有正確更新以外，所有的東西都能正常工作。
正如你可以看到，當我按從列表（只需在列表中的第一項）的項目，然後將其設置loadedSub到真正然後使用異步任務得到線程列表，然後在postexecute它調用notifyDataSetChanged（） on PagerAdapter。問題是它只是完全更新UI，即使只留下1個選項卡，但是問題在於threadList未出現在列表視圖中。它只顯示我的列表視圖與以前的數據，而不是線程列表。
我應該使用其他活動還是有東西丟失？
MainActivity.java
package com.ovnis.sscattered.elakiriunofficial;
import android.app.ProgressDialog;
import android.content.Context;
import android.os.AsyncTask;
import android.support.design.widget.TabLayout;
import android.support.design.widget.FloatingActionButton;
import android.support.design.widget.Snackbar;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.os.Bundle;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.view.ViewGroup;
import android.widget.AdapterView;
import android.widget.ListView;
import android.widget.Toast;
import org.jsoup.Connection;
import org.jsoup.Jsoup;
import org.jsoup.nodes.Document;
import org.jsoup.nodes.Element;
import org.jsoup.select.Elements;
import java.io.IOException;
public class MainActivity extends AppCompatActivity {
/**
* The {@link android.support.v4.view.PagerAdapter} that will provide
* fragments for each of the sections. We use a
* {@link FragmentPagerAdapter} derivative, which will keep every
* loaded fragment in memory. If this becomes too memory intensive, it
* may be best to switch to a
* {@link android.support.v4.app.FragmentStatePagerAdapter}.
*/
public static SectionsPagerAdapter mSectionsPagerAdapter;
/**
* The {@link ViewPager} that will host the section contents.
*/
public static ViewPager mViewPager;
public static String[][] forumListSubForumsList = new String[13][];
public static String[][] forumListSubForumListLinks = new String[13][];
public static String[][] threadListLinks = new String[2][];
static Context context;
public String[] forumNumbers = {"1", "86", "89", "6",
"66", "79", "70", "12",
"16", "33", "42", "25",
"22"};
public static String subforumLink;
static boolean loaded = false;
static boolean loadedSub = false;
static boolean subForumMode = false;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Create the adapter that will return a fragment for each of the three
// primary sections of the activity.
mSectionsPagerAdapter = new SectionsPagerAdapter(getSupportFragmentManager());
// Set up the ViewPager with the sections adapter.
mViewPager = (ViewPager) findViewById(R.id.container);
mViewPager.setAdapter(mSectionsPagerAdapter);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(mViewPager);
FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab);
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Snackbar.make(view, "Replace with your own action", Snackbar.LENGTH_LONG)
.setAction("Action", null).show();
}
});
new GetSubForumList().execute();
context = getBaseContext();
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
// Inflate the menu; this adds items to the action bar if it is present.
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// Handle action bar item clicks here. The action bar will
// automatically handle clicks on the Home/Up button, so long
// as you specify a parent activity in AndroidManifest.xml.
int id = item.getItemId();
//noinspection SimplifiableIfStatement
if (id == R.id.action_settings) {
return true;
}
return super.onOptionsItemSelected(item);
}
/**
* A placeholder fragment containing a simple view.
*/
public static class SubForumsFrag extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
static ListView listview;
static ForumListAdapter adapter;
int pos = 0;
public SubForumsFrag() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static SubForumsFrag newInstance(int pos) {
SubForumsFrag fragment = new SubForumsFrag();
Bundle args = new Bundle();
args.putInt("poskey", pos);
fragment.setArguments(args);
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.list_base, container, false);
listview = (ListView) rootView.findViewById(R.id.listview);
pos = getArguments().getInt("poskey");
if(loaded){
adapter = new ForumListAdapter(getActivity(), forumListSubForumsList[pos]);
}
listview.setAdapter(adapter);
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
Toast.makeText(getContext(), forumListSubForumListLinks[pos][position], Toast.LENGTH_SHORT).show();
subForumMode = true;
subforumLink = forumListSubForumListLinks[pos][position];
new GetThreadList().execute();
}
});
return rootView;
}
}
public static class ThreadListFrag extends Fragment {
/**
* The fragment argument representing the section number for this
* fragment.
*/
static ListView listview;
static ForumListAdapter adapter;
int pos = 0;
public ThreadListFrag() {
}
/**
* Returns a new instance of this fragment for the given section
* number.
*/
public static ThreadListFrag newInstance() {
ThreadListFrag fragment = new ThreadListFrag();
return fragment;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.list_base, container, false);
listview = (ListView) rootView.findViewById(R.id.listview);
if(loadedSub){
adapter = new ForumListAdapter(getActivity(), threadListLinks[0]);
}
listview.setAdapter(adapter);
listview.setOnItemClickListener(new AdapterView.OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view, int position, long id) {
//Toast.makeText(getContext(), forumListSubForumListLinks[pos][position], Toast.LENGTH_SHORT).show();
}
});
return rootView;
}
}
/**
* A {@link FragmentPagerAdapter} that returns a fragment corresponding to
* one of the sections/tabs/pages.
*/
public class SectionsPagerAdapter extends FragmentPagerAdapter {
public SectionsPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
// getItem is called to instantiate the fragment for the given page.
// Return a SubForumsFrag (defined as a static inner class below).
if(!subForumMode){
return SubForumsFrag.newInstance(position);
}else{
return ThreadListFrag.newInstance();
}
}
@Override
public int getCount() {
// Show 13 total pages.
if(!subForumMode){
return 13;
}else{
return 1;
}
}
@Override
public CharSequence getPageTitle(int position) {
if(!subForumMode){
switch (position) {
case 0:
return "Elakiri";
case 1:
return "Cooking";
case 2:
return "B & M";
case 3:
return "General";
case 4:
return "E. Traveler";
case 5:
return "Automobile";
case 6:
return "Motorcycles";
case 7:
return "Entertainment";
case 8:
return "C & I";
case 9:
return "S. Piyasa";
case 10:
return "Elakiri Magic";
case 11:
return "Games";
case 12:
return "Mobile";
}
}else{
return "Bitch Me";
}
return null;
}
@Override
public int getItemPosition(Object obj){
return POSITION_NONE;
}
}
class GetSubForumList extends AsyncTask<Void, Integer, String>
{
String TAG = getClass().getSimpleName();
ProgressDialog dialog;
protected void onPreExecute(){
Log.d(TAG + " PreExceute","On pre Exceute......");
dialog = new ProgressDialog(MainActivity.this);
dialog.setTitle("Loading...");
dialog.setIndeterminate(true);
dialog.setCancelable(false);
dialog.show();
}
protected String doInBackground(Void...arg0){
Log.d(TAG + " DoINBackGround","On doInBackground...");
try {
Connection.Response response = Jsoup.connect("http://www.elakiri.com/forum/")
.execute();
Document parsedDoc = response.parse();
Element doc;
Elements doce;
for(int i = 0; i < forumNumbers.length; i++){
doc = parsedDoc.select("tbody#collapseobj_forumbit_" + forumNumbers[i]).first();
doce = doc.select("a[href] strong");
forumListSubForumsList[i] = new String[(doce.size()+1)/2];
forumListSubForumListLinks[i] = new String[(doce.size()+1)/2];
for(int q = 0; q < (doce.size()+1)/2; q++){
forumListSubForumsList[i][q] = doce.get(q*2).text();
forumListSubForumListLinks[i][q] = doce.get(q*2).parent().absUrl("href");
}
}
} catch (IOException e) {
e.printStackTrace();
}
return "Shot";
}
protected void onProgressUpdate(Integer...a){
Log.d(TAG + " onProgressUpdate", "You are in progress update ... " + a[0]);
}
protected void onPostExecute(String result) {
Log.d(TAG + " onPostExecute", "" + result);
loaded = true;
mViewPager.invalidate();
mSectionsPagerAdapter.notifyDataSetChanged();
dialog.dismiss();
}
}
static class GetThreadList extends AsyncTask<Void, Integer, String>
{
String TAG = getClass().getSimpleName();
ProgressDialog dialog;
protected void onPreExecute(){
Log.d(TAG + " PreExceute","On pre Exceute......");
dialog = new ProgressDialog(context);
dialog.setTitle("Loading...");
dialog.setIndeterminate(true);
dialog.setCancelable(false);
// dialog.show();
}
protected String doInBackground(Void...arg0){
Log.d(TAG + " DoINBackGround","On doInBackground...");
try {
Connection.Response response = Jsoup.connect(subforumLink)
.execute();
Element doc = response.parse().select("tbody#threadbits_forum_2").first();
Elements doce = doc.select("a[id^=thread_title_]");
threadListLinks[0] = new String[doce.size()];
threadListLinks[1] = new String[doce.size()];
for(int i = 0; i < doce.size(); i++){
threadListLinks[0][i] = doce.get(i).text();
threadListLinks[1][i] = doce.get(i).absUrl("href");
}
} catch (IOException e) {
e.printStackTrace();
}
return "Shot";
}
protected void onProgressUpdate(Integer...a){
Log.d(TAG + " onProgressUpdate", "You are in progress update ... " + a[0]);
}
protected void onPostExecute(String result) {
Log.d(TAG + " onPostExecute", "" + result);
loadedSub = true;
mViewPager.invalidate();
mSectionsPagerAdapter.notifyDataSetChanged();
}
}
}
ForumListAdapter.java
public class ForumListAdapter extends ArrayAdapter<String> {
private final Context context;
private final String[] values;
public ForumListAdapter(Context context, String[] values) {
super(context, R.layout.main_adapter ,values);
this.context = context;
this.values = values;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
LayoutInflater inflater = (LayoutInflater) context
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View rowView = inflater.inflate(R.layout.main_adapter, parent, false);
TextView textView = (TextView) rowView.findViewById(R.id.firstLine);
textView.setText(values[position]);
return rowView;
}
}