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Я работаю Tabhost (viepager) У меня есть три фрагмента и каждый фрагмент, который я разбирал json, и я могу показать элементы json в списке каждого фрагмента (он работает идеально), но у меня есть одна проблема. Я использую AsyncTask для разбора JSON и шоу ListView, но все три AsyncTask работает вместе это мой кодAndroid три asynctasks работает вместе
public class MainActivity extends FragmentActivity implements
TabHost.OnTabChangeListener, ViewPager.OnPageChangeListener {
private TabHost mTabHost;
private ViewPager mViewPager;
private HashMap<String, TabInfo> mapTabInfo = new HashMap<String, MainActivity.TabInfo>();
private PagerAdapter mPagerAdapter;
private HorizontalScrollView horizontalScrollView;
private ImageButton menubutton;
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
requestWindowFeature(Window.FEATURE_NO_TITLE);
setContentView(R.layout.activity_main);
menubutton = (ImageButton) findViewById(R.id.menubutton);
menubutton.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View arg0) {
Toast.makeText(getApplicationContext(), "Helo",
Toast.LENGTH_SHORT).show();
}
});
this.initialiseTabHost(savedInstanceState);
if (savedInstanceState != null) {
mTabHost.setCurrentTabByTag(savedInstanceState.getString("tab"));
}
this.intialiseViewPager();
}
protected void onSaveInstanceState(Bundle outState) {
outState.putString("tab", mTabHost.getCurrentTabTag());
super.onSaveInstanceState(outState);
}
private void intialiseViewPager() {
List<Fragment> fragments = new Vector<Fragment>();
fragments.add(Fragment.instantiate(this, Pirveli.class.getName()));
fragments.add(Fragment.instantiate(this, Meore.class.getName()));
fragments.add(Fragment.instantiate(this, Mesame.class.getName()));
this.mPagerAdapter = new PagerAdapter(
super.getSupportFragmentManager(), fragments);
this.mViewPager = (ViewPager) super.findViewById(R.id.viewpager);
this.horizontalScrollView = (HorizontalScrollView) super
.findViewById(R.id.horizontalScrollView);
this.mViewPager.setAdapter(this.mPagerAdapter);
this.mViewPager.setOnPageChangeListener(this);
}
public void centerTabItem(int position) {
mTabHost.setCurrentTab(position);
final TabWidget tabWidget = mTabHost.getTabWidget();
@SuppressWarnings("deprecation")
final int screenWidth = getWindowManager().getDefaultDisplay()
.getWidth();
final int leftX = tabWidget.getChildAt(position).getLeft();
int newX = 0;
newX = leftX + (tabWidget.getChildAt(position).getWidth()/2)
- (screenWidth/2);
if (newX < 0) {
newX = 0;
}
horizontalScrollView.scrollTo(newX, 0);
}
private void initialiseTabHost(Bundle args) {
mTabHost = (TabHost) findViewById(android.R.id.tabhost);
mTabHost.setup();
TabInfo tabInfo = null;
MainActivity.AddTab(
this,
this.mTabHost,
this.mTabHost.newTabSpec("All Channels").setIndicator(
"All Channels"), (tabInfo = new TabInfo("All Channels",
Pirveli.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
MainActivity.AddTab(
this,
this.mTabHost,
this.mTabHost.newTabSpec("Commersant").setIndicator(
"Commersant"), (tabInfo = new TabInfo("Commersant",
Meore.class, args)));
this.mapTabInfo.put(tabInfo.tag, tabInfo);
MainActivity.AddTab(this, this.mTabHost,
this.mTabHost.newTabSpec("Tabula").setIndicator("Tabula"),
(tabInfo = new TabInfo("Tabula", Mesame.class, args)));
mTabHost.setOnTabChangedListener(this);
}
private static void AddTab(MainActivity activity, TabHost tabHost,
TabHost.TabSpec tabSpec, TabInfo tabInfo) {
tabSpec.setContent(activity.new TabFactory(activity));
tabHost.addTab(tabSpec);
}
public void onTabChanged(String tag) {
for (int tabIndex = 0; tabIndex < mTabHost.getTabWidget().getTabCount(); tabIndex++) {
View tab = mTabHost.getTabWidget().getChildTabViewAt(tabIndex);
TextView t = (TextView) tab.findViewById(android.R.id.title);
t.setTextColor(getResources().getColor(R.color.text_color));
}
int pos = this.mTabHost.getCurrentTab();
this.mViewPager.setCurrentItem(pos);
}
@Override
public void onPageScrolled(int position, float positionOffset,
int positionOffsetPixels) {
}
@Override
public void onPageSelected(int position) {
centerTabItem(position);
}
@Override
public void onPageScrollStateChanged(int state) {
}
private class TabInfo {
private String tag;
@SuppressWarnings("unused")
private Class<?> clss;
@SuppressWarnings("unused")
private Bundle args;
@SuppressWarnings("unused")
private Fragment fragment;
TabInfo(String tag, Class<?> clazz, Bundle args) {
this.tag = tag;
this.clss = clazz;
this.args = args;
}
}
class TabFactory implements TabContentFactory {
private final Context mContext;
public TabFactory(Context context) {
mContext = context;
}
public View createTabContent(String tag) {
View v = new View(mContext);
v.setMinimumWidth(0);
v.setMinimumHeight(0);
return v;
}
}
}
и это код с первым Фрагмена лет (весь код Fragment «s таким же, отличается URL-адреса только JSON в)
public class Pirveli extends Fragment {
private String URL = "*******************************";
public static String KEY_title = "title";
public static String KEY_description = "description";
public static String KEY_image = "image";
public static String KEY_journal = "journal";
public static String KEY_JournalID = "JournalID";
public static String KEY_pubDate = "pubDate";
public static String KEY_statID = "statID";
public JSONArray jsonarray;
public ListView list;
public TransparentProgressDialog pd;
public JSONParser jsonparser;
static DealBoxAdapter adapter;
ProgressDialog pDialog, pDialog1;
static String fontPath2 = "font.ttf";
public static Typeface tf2;
ArrayList<HashMap<String, String>> itemList = new ArrayList<HashMap<String, String>>();
public ImageLoader imageLoader;
static final int DIALOG_ERROR_CONNECTION = 1;
private int screenSize;
private LoadDataAllChanelsToServer loader;
public static String dateTime;
private ArrayList<Content> contents = new ArrayList<Content>();
public static boolean oneTime = false;
public TextView journal, tittle, description, smalllink, DateTime,
smallstatID;
HashMap<String, String> map;
private ConnectionDetector cd;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.send_items, container, false);
list = (ListView) rootView.findViewById(R.id.pirvelilistview);
cd = new ConnectionDetector(getActivity());
pd = new TransparentProgressDialog(getActivity(), R.drawable.loader);
screenSize = getResources().getConfiguration().screenLayout
& Configuration.SCREENLAYOUT_SIZE_MASK;
loader = new LoadDataAllChanelsToServer();
list.setOnItemClickListener(new android.widget.AdapterView.OnItemClickListener() {
@Override
public void onItemClick(android.widget.AdapterView<?> parent,
View view, int position, long id) {
journal = (TextView) view.findViewById(R.id.smalljournal1);
tittle = (TextView) view.findViewById(R.id.smalltitle1);
description = (TextView) view
.findViewById(R.id.smallDescription1);
smalllink = (TextView) view.findViewById(R.id.smalllink1);
DateTime = (TextView) view.findViewById(R.id.smallDateTime1);
smallstatID = (TextView) view.findViewById(R.id.smallstatID1);
String Stringjournal = journal.getText().toString();
String Stringtittle = tittle.getText().toString();
String Stringdescription = description.getText().toString();
String Stringlink = smalllink.getText().toString();
String StringdateTime = DateTime.getText().toString();
String StringstatID = smallstatID.getText().toString();
Intent in = new Intent(getActivity(),
com.leavingstone.dealbox.Result.class);
in.putExtra("KEY_journal", Stringjournal);
in.putExtra("KEY_title", Stringtittle);
in.putExtra("KEY_description", Stringdescription);
in.putExtra("KEY_link", Stringlink);
in.putExtra("KEY_pubDate", StringdateTime);
in.putExtra("KEY_statID", StringstatID);
String url = itemList.get(position).get(Pirveli.KEY_image);
if (url.endsWith("-c.jpg"))
url = url.replace("-c.jpg", ".jpg");
in.putExtra("Bitmap", url);
in.putExtra("Bitmap", url);
startActivity(in);
}
});
if (!cd.isConnectingToInternet()) {
Toast.makeText(getActivity(), "No internet connection",
Toast.LENGTH_SHORT).show();
} else {
loader.execute();
}
return rootView;
}
private class LoadDataAllChanelsToServer extends
AsyncTask<String, Integer, String> {
@Override
protected void onPreExecute() {
pd.show();
}
@Override
protected String doInBackground(String... urls) {
jsonparser = new JSONParser();
JSONObject jsonobject = jsonparser.getJSONfromURL(URL);
try {
jsonarray = jsonobject.getJSONArray("data");
for (int i = 0; i < jsonarray.length(); i++) {
jsonobject = jsonarray.getJSONObject(i);
map = new HashMap<String, String>();
map.put("journal", jsonobject.getString(KEY_journal));
map.put("image", jsonobject.getString(KEY_image));
map.put("title", jsonobject.getString(KEY_title));
map.put("description",
jsonobject.getString(KEY_description));
map.put("JournalID", jsonobject.getString(KEY_JournalID));
map.put("pubDate", jsonobject.getString(KEY_pubDate));
map.put("statID", jsonobject.getString(KEY_statID));
Content cont = new Content(jsonobject.getString("journal"),
jsonobject.getString("image"),
jsonobject.getString("title"),
jsonobject.getString("pubDate"),
jsonobject.getString("description"),
jsonobject.getString("JournalID"),
jsonobject.getString("statID"));
contents.add(cont);
itemList.add(map);
dateTime = itemList.get(itemList.size() - 1).get(
KEY_pubDate);
}
} catch (JSONException e) {
Log.e("Error", e.getMessage());
e.printStackTrace();
}
return itemList.toString();
}
@Override
protected void onPostExecute(String result) {
try {
if (pd != null) {
pd.dismiss();
}
} catch (Exception e) {
}
try {
adapter = new DealBoxAdapter(getActivity(), itemList,
screenSize);
list.setAdapter(adapter);
} catch (NullPointerException e) {
e.printStackTrace();
}
}
}
@Override
public void onDestroy() {
super.onDestroy();
try {
if (loader != null) {
loader.cancel(true);
loader = null;
}
} catch (Exception e) {
}
}
}
можно запускать каждую AsyncTask, когда я отправляю каждый фрагмент? , например, первый раз должен работать Asynctas первый фрагмент и т.д ....
С СОТОВОГО андроид версии, вы можете выполнить 5 AsyncTask одновременно, но до Honeycomb пула потоков была ограничена 1. –
мое приложение версии 4.1 и выше ... (андроида: minSdkVersion = «11» андроид : targetSdkVersion = "14") – user3293990
Возможный дубликат [Как определить, когда фрагмент становится видимым в ViewPager] (http://stackoverflow.com/questions/10024739/how-to-determine-when-fragment-becomes-visible-in -viewpager) –