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Я использую PagerSlidingTabStrip library, но у меня есть проблема с этой библиотекой. У меня есть GridView, который обновляется из Интернета по номеру AsyncTask, когда страница изменена. Моя проблема в том, что первая страница пуста. Когда я нажимаю на вкладку 2, содержимое появляется, но если я нажму на вкладку 3, когда выбрана вкладка 1 (перейдите на вкладку с выбранной вкладки), страница также пуста. Он работает только хорошо, если я прокручиваю страницы один за другим или нажимаю на «следующую вкладку» (переместите одну вкладку на выбранной вкладке).просмотр пейджер иногда показывают пустой
Почему эта страница иногда пуста?
Приложение примера библиотеки работает правильно, но оно меняет вид на создание. Мой код отличается от того, что вид сетки обновлен в AsyncTask с помощью выбранной страницы изменения.
Код для subCategoryActivity.java:
public class SubCategoryActivity extends SherlockFragmentActivity {
static SubCategoryObjectsFragment f;
private PagerSlidingTabStrip tabs;
private ViewPager pager;
private MyPagerAdapter pagerAdapter;
TextView tvCustomTitle;
static List<NameValuePair> nameValuePairs = new ArrayList<NameValuePair>();
static JSONArray jsonArray;
static String url = "http://192.168.1.2/arel/SubCat.php";
static String url2 = "http://192.168.1.2/arel/subCatObject.php";
private static String[][] SubCat;
GridviewAdapter gridAdapter;
static GridView gridViewSubCategory;
HashMap<String, String> map;
static ArrayList<HashMap<String, String>> list = new ArrayList<HashMap<String, String>>();
Intent intent;
private class getSubCategoryObjects extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... url) {
// TODO Auto-generated method stub
return BaseActivity.jsonParser.makeHttpRequest(url[0], "POST",
nameValuePairs);
}
@Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
try {
jsonArray = new JSONArray(result);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObjet;
map = new HashMap<String, String>();
try {
jsonObjet = jsonArray.getJSONObject(i);
map.put("id", String.valueOf(jsonObjet.getInt("id")));
map.put("title", jsonObjet.getString("title_fa"));
map.put("image", jsonObjet.getString("image"));
map.put("price", jsonObjet.getString("price"));
map.put("date", jsonObjet.getString("date"));
list.add(map);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO: handle exception
e.printStackTrace();
}
}
gridAdapter = new GridviewAdapter(SubCategoryActivity.this, list);
gridViewSubCategory.setAdapter(gridAdapter);
}
}
private class getSubCategory extends AsyncTask<String, Void, String> {
@Override
protected String doInBackground(String... url) {
// TODO Auto-generated method stub
return BaseActivity.jsonParser.makeHttpRequest(url[0], "POST",
nameValuePairs);
}
@Override
protected void onProgressUpdate(Void... values) {
// TODO Auto-generated method stub
super.onProgressUpdate(values);
}
@Override
protected void onPostExecute(String result) {
// TODO Auto-generated method stub
try {
jsonArray = new JSONArray(result);
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
}
SubCat = new String[jsonArray.length()][2];
for (int i = 0; i < jsonArray.length(); i++) {
JSONObject jsonObjet;
try {
jsonObjet = jsonArray.getJSONObject(i);
SubCat[i][0] = String.valueOf(jsonObjet.getInt("id"));
SubCat[i][1] = jsonObjet.getString("title_fa");
} catch (JSONException e) {
// TODO Auto-generated catch block
e.printStackTrace();
} catch (Exception e) {
// TODO: handle exception
e.toString();
}
}
pagerAdapter = new MyPagerAdapter(getSupportFragmentManager());
pager.setAdapter(pagerAdapter);
// pager.setCurrentItem(0);
//pager.setOffscreenPageLimit(0);
tabs.setOnPageChangeListener(new OnPageChangeListener() {
@Override
public void onPageSelected(int arg0) {
// TODO Auto-generated method stub
jsonArray = new JSONArray();
list = new ArrayList<HashMap<String, String>>();
nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("getAdvertise", "true"));
nameValuePairs.add(new BasicNameValuePair("subCatId",
SubCat[arg0][0]));
// Activity myActivity = getActivity();
// if (myActivity instanceof SubCategoryActivity) {
new getSubCategoryObjects().execute(url2);
}
@Override
public void onPageScrolled(int arg0, float arg1, int arg2) {
// TODO Auto-generated method stub
}
@Override
public void onPageScrollStateChanged(int arg0) {
// TODO Auto-generated method stub
}
});
//jsonArray = new JSONArray();
// final int pageMargin = (int) TypedValue.applyDimension(
// TypedValue.COMPLEX_UNIT_DIP, 16, getResources()
// .getDisplayMetrics());
// pager.setPageMargin(pageMargin);
tabs.setViewPager(pager);
tabs.setTextSize(20);
tabs.setTypeface(BaseActivity.font, Typeface.NORMAL);
// list = new ArrayList<HashMap<String, String>>();
// nameValuePairs = new ArrayList<NameValuePair>();
// nameValuePairs.add(new BasicNameValuePair("getAdvertise", "true"));
// nameValuePairs.add(new BasicNameValuePair("subCatId",
// SubCat[0][0]));
//new getSubCategoryObjects().execute(url2);
}
}
@SuppressLint("NewApi")
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_list);
intent = getIntent();
tabs = (PagerSlidingTabStrip) findViewById(R.id.tabs);
pager = (ViewPager) findViewById(R.id.pager);
jsonArray = new JSONArray();
nameValuePairs = new ArrayList<NameValuePair>();
nameValuePairs.add(new BasicNameValuePair("getSubCategory", "true"));
nameValuePairs.add(new BasicNameValuePair("catId", intent
.getStringExtra("id")));
new getSubCategory().execute(url);
getSupportActionBar().setDisplayHomeAsUpEnabled(true);
getSupportActionBar().setDisplayShowTitleEnabled(false);
getSupportActionBar().setDisplayShowCustomEnabled(true);
tvCustomTitle = new TextView(this);
tvCustomTitle.setText(intent.getStringExtra("title"));
LinearLayout ll = new LinearLayout(this);
LinearLayout.LayoutParams para = new LinearLayout.LayoutParams(
LayoutParams.WRAP_CONTENT, LayoutParams.WRAP_CONTENT);
para.setMargins(0, 0, 0, 0); // left,top,right, bottom
para.gravity = Gravity.CENTER_VERTICAL;
tvCustomTitle.setTypeface(BaseActivity.font);
Configuration config = getResources().getConfiguration();
if (Build.VERSION.SDK_INT >= 13) {
if (config.smallestScreenWidthDp >= 600) {
tvCustomTitle.setTextSize(22);
} else {
tvCustomTitle.setTextSize(14);
}
} else {
tvCustomTitle.setTextSize(14);
}
tvCustomTitle.setTextColor(Color.WHITE);
ll.addView(tvCustomTitle, para);
getSupportActionBar().setCustomView(ll);
changeColor(intent.getIntExtra("color", Color.parseColor("#FF666666")));
}
private void changeColor(int newColor) {
tabs.setIndicatorColor(newColor);
// change ActionBar color just if an ActionBar is available
Drawable colorDrawable = new ColorDrawable(newColor);
Drawable bottomDrawable = getResources().getDrawable(
R.drawable.actionbar_bottom);
LayerDrawable ld = new LayerDrawable(new Drawable[] { colorDrawable,
bottomDrawable });
getSupportActionBar().setBackgroundDrawable(ld);
}
/*
* @Override protected void onSaveInstanceState(Bundle outState) {
* super.onSaveInstanceState(outState);
*
* }
*
* @Override protected void onRestoreInstanceState(Bundle
* savedInstanceState) { super.onRestoreInstanceState(savedInstanceState);
*
* }
*/
public static class MyPagerAdapter extends FragmentStatePagerAdapter {
public MyPagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public CharSequence getPageTitle(int position) {
return SubCat[position][1];
}
@Override
public int getCount() {
return SubCat.length;
}
@Override
public Fragment getItem(int position) {
f = new SubCategoryObjectsFragment();
Bundle b = new Bundle();
b.putString(SubCategoryObjectsFragment.ARG_ID, SubCat[position][0]);
f.setArguments(b);
return f;
}
}
public static class SubCategoryObjectsFragment extends Fragment {
private static final String ARG_ID = "id";
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(
R.layout.fragment_sub_category_objects, container, false);
// gridViewSubCategory = new GridView(getActivity());
gridViewSubCategory = (GridView) rootView.findViewById(R.id.gridViewSubCategory);
return rootView;
}
@Override
public void onActivityCreated(Bundle savedInstanceState) {
// TODO Auto-generated method stub
super.onActivityCreated(savedInstanceState);
/*
* jsonArray = new JSONArray(); list = new ArrayList<HashMap<String,
* String>>(); nameValuePairs = new ArrayList<NameValuePair>();
* nameValuePairs.add(new BasicNameValuePair("getAdvertise",
* "true")); nameValuePairs.add(new BasicNameValuePair("subCatId",
* getArguments().getString("id")));
*
*
* Activity myActivity = getActivity(); if (myActivity instanceof
* SubCategoryActivity) { ((SubCategoryActivity) myActivity).new
* getSubCategoryObjects().execute(url2); }
*/
// Implement On Item click listener
gridViewSubCategory
.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent,
View view, int position, long id) {
// TODO Auto-generated method stub
BaseActivity.cd = new ConnectionDetector(
getActivity());
BaseActivity.isInternetPresent = BaseActivity.cd
.isConnectingToInternet();
if (BaseActivity.isInternetPresent) {
Intent i = new Intent(getActivity(),
SubCategoryActivity.class);
i.putExtra("id", ((TextView) view
.findViewById(R.id.textViewId))
.getText().toString());
i.putExtra(
"color",
i.getIntExtra("color",
Color.parseColor("#FF666666")));
startActivity(i);
} else {
Toast.makeText(
getActivity(),
"به اینترنت متصل نیستید، به اینترنت متصل شده و دوباره امتحان کنید.",
Toast.LENGTH_SHORT).show();
}
}
});
}
}
public class GridviewAdapter extends BaseAdapter {
private Activity activity;
private ArrayList<HashMap<String, String>> list;
HashMap<String, String> tempMap;
public GridviewAdapter(Activity activity,
ArrayList<HashMap<String, String>> list) {
this.activity = activity;
this.list = list;
}
@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}
public Object getItem(int position) {
return position;
}
public long getItemId(int position) {
return position;
}
@Override
public View getView(int position, View convertView, ViewGroup parent) {
// TODO Auto-generated method stub
LayoutInflater inflator = activity.getLayoutInflater();
View vi = convertView;
if (convertView == null)
vi = inflator.inflate(R.layout.gridview_sub_category_row, null);
TextView id = (TextView) vi.findViewById(R.id.textViewId);
TextView title = (TextView) vi.findViewById(R.id.textViewTitle);
ImageView imageViewSubCat = (ImageView) vi
.findViewById(R.id.imageViewSubCat);
TextView price = (TextView) vi.findViewById(R.id.textViewPrice);
TextView date = (TextView) vi.findViewById(R.id.textViewDate);
RelativeLayout textBackground = (RelativeLayout) vi
.findViewById(R.id.relativeLayoutText);
tempMap = new HashMap<String, String>();
tempMap = list.get(position);
id.setText(tempMap.get("id"));
textBackground.setBackgroundColor(intent.getIntExtra("color",
Color.parseColor("#FF666666")));
title.setText(tempMap.get("title"));
price.setText(tempMap.get("price"));
date.setText(tempMap.get("date"));
title.setTypeface(BaseActivity.font);
price.setTypeface(BaseActivity.font);
date.setTypeface(BaseActivity.font);
// File cachedImg = ImageLoader.getInstance().getDiscCache()
// .get(picUrl + tempMap.get("logo") + ".jpg");
// if (cachedImg.exists())
// cachedImg.delete();
ImageLoader.getInstance().displayImage(
BaseActivity.picUrl + tempMap.get("image") + ".jpg",
imageViewSubCat);
return vi;
}
}
@Override
public boolean onPrepareOptionsMenu(Menu menu) {
// TODO Auto-generated method stub
menu.clear();
menu.add("آگهی جدید").setIcon(R.drawable.action_advertise_new)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
menu.add("غربال").setIcon(R.drawable.action_search)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
menu.add("مرتب سازی").setIcon(R.drawable.action_sort)
.setShowAsAction(MenuItem.SHOW_AS_ACTION_ALWAYS);
return super.onPrepareOptionsMenu(menu);
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
if (item.getItemId() == android.R.id.home) {
finish();
return true;
}
return super.onOptionsItemSelected(item);
}
}
код для activity_list.xml:
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<com.astuetz.viewpager.extensions.PagerSlidingTabStrip
android:id="@+id/tabs"
android:layout_width="match_parent"
android:layout_height="48dip"
android:background="@drawable/background_tabs" />
<android.support.v4.view.ViewPager
android:id="@+id/pager"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_below="@+id/tabs"
tools:context=".SubCategoryActivity" />
</RelativeLayout>
код для gridview_sub_category_row.xml:
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp" >
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="200dp" >
<TextView
android:id="@+id/textViewId"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:visibility="gone" />
<ImageView
android:id="@+id/imageViewSubCat"
android:layout_width="match_parent"
android:layout_height="140dp"
android:layout_alignParentTop="true"
android:layout_centerHorizontal="true" />
<RelativeLayout
android:id="@+id/relativeLayoutText"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@+id/imageViewSubCat"
android:background="#FF3F9FE0" >
<TextView
android:id="@+id/textViewTitle"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentLeft="true"
android:layout_alignParentRight="true"
android:layout_marginLeft="10dp"
android:layout_marginRight="10dp"
android:layout_marginTop="5dp"
android:gravity="right"
android:text="همه"
android:textAppearance="?android:attr/textAppearanceMedium" />
<TextView
android:id="@+id/textViewPrice"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_alignRight="@+id/textViewTitle"
android:layout_marginBottom="5dp"
android:layout_toRightOf="@+id/textViewDate"
android:gravity="right"
android:text="20500000 تومان" />
<TextView
android:id="@+id/textViewDate"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignBaseline="@+id/textViewPrice"
android:layout_alignBottom="@+id/textViewPrice"
android:layout_alignParentLeft="true"
android:layout_marginLeft="14dp"
android:text="دقایقی پیش" />
</RelativeLayout>
</RelativeLayout>
</RelativeLayout>
код fragment_sub_category_objects.xml:
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<GridView
android:id="@+id/gridViewSubCategory"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:columnWidth="300dp"
android:horizontalSpacing="16dp"
android:numColumns="auto_fit"
android:scrollbars="none"
android:verticalSpacing="16dp" >
</GridView>
</FrameLayout>
Почему у вас так много статических ссылок на просмотр объектов и фрагментов в вашей деятельности? – natez0r