在切换标签后，ListFragments无限滚动不起作用

Question

我有一个主要活动的应用程序托管由标签控制的2个列表片段（由actionbarsherlock提供）。

两个片段在代码中更不相同，并且动态地从服务器加载数据。一个显示最新内容，第二个显示数据库中的所有内容，实现无限滚动。

如果仅按以下顺序使用，则一切正常： latestFragment - ＆gt; allFragment

但是当我从latestFragment回归allFragment时 allFragment - ＆gt; latestFragment

无尽的滚动停止工作!!

我是Android开发的新手，研究了一些零碎的东西确实设法将它们放在一起，但它卡在这里。我简直无法绕开。然后无论我做什么滚动都不会工作，直到我关闭应用程序并重新开始。

MainActivity.java

public class MainActivity extends SlidingFragmentActivity implements OnQueryTextListener
{ protected static DisplayImageOptions options; protected static ImageLoader imageLoader; ArrayList latest; ArrayList generes;

            ActionBar.Tab latestTab;
            ActionBar.Tab AllTab;

            LatestNewsFragment latestNews;
            AllNewsFragment allNews;


            MenuItem search;
            SearchView searchView;
            ProgressBar pBar;
            SharedPreferences settings;

            protected CategoryListFragment mFrag;


            @Override
            public void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            this.setContentView(R.layout.activity_main);

            pBar = (ProgressBar) this.findViewById(R.id.pBar);
            pBar.setVisibility(View.GONE);

            ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this.getApplicationContext())
            .build();

            imageLoader = ImageLoader.getInstance();
            imageLoader.init(config);

            options = new DisplayImageOptions.Builder()
            .showStubImage(R.drawable.poster)
            .delayBeforeLoading(2000)
            .showImageForEmptyUri(R.drawable.poster)
            .showImageOnFail(R.drawable.poster)
            .bitmapConfig(Bitmap.Config.RGB_565)
            .imageScaleType(ImageScaleType.NONE)
            .cacheOnDisc()
            .cacheInMemory()
            .build();

            Bundle extras = getIntent().getExtras();
            latest = extras.getParcelableArrayList("latest");
            generes = extras.getParcelableArrayList("generes");
            disclaimer = extras.getString("disclaimer");

            /* Tabs */
            getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS);

            /* Latest list fragment */
            latestNews = new LatestNewsFragment();
            latestNews.setImagLoader(imageLoader);
            latestNews.setImageDisplayOptions(options);
            latestNews.setData(latest);
            latestTab = getSupportActionBar().newTab().setText("Latest");
            latestTab.setTabListener(new TabListener(latestNews));
            getSupportActionBar().addTab(latestTab);

            /* All news list fragment */
            allNews = new AllNewsFragment();
            allNews.setImagLoader(imageLoader);
            allNews.setImageDisplayOptions(options);
            AllTab = getSupportActionBar().newTab().setText("Browse All");
            AllTab.setTabListener(new TabListener(allNews));
            getSupportActionBar().addTab(AllTab);

            /* Sliding menu */

            // set the Behind View
            setBehindContentView(R.layout.menu_frame);
            if (savedInstanceState == null) {
            FragmentTransaction t = this.getSupportFragmentManager().beginTransaction();
            mFrag = new CategoryListFragment();
            mFrag.setData(generes);
            t.replace(R.id.menu_frame, mFrag);
            t.commit();
            } else {
            mFrag = (CategoryListFragment)this.getSupportFragmentManager().findFragmentById(R.id.menu_frame);
            }

            // customize the SlidingMenu
            SlidingMenu sm = getSlidingMenu();
            sm.setShadowWidthRes(R.dimen.shadow_width);
            sm.setShadowDrawable(R.drawable.shadow);
            sm.setBehindOffsetRes(R.dimen.slidingmenu_offset);
            sm.setFadeDegree(0.35f);
            sm.setTouchModeAbove(SlidingMenu.TOUCHMODE_MARGIN);

            getSupportActionBar().setDisplayHomeAsUpEnabled(true);
            getSupportActionBar().setDisplayShowTitleEnabled(false);

            settings = getSharedPreferences("com.newsspace.mobile.android", Context.MODE_PRIVATE);
            boolean hasAcceptedPolicy = settings.getBoolean("disclaimeraccept", false);

            if(!hasAcceptedPolicy)
            showDisclaimer(this, disclaimer);
            }

            void showDisclaimer(final Activity context, String message)
            {
            AlertDialog.Builder alertDialog = new AlertDialog.Builder(this);

            // Setting Dialog Title
            alertDialog.setTitle(getText(R.string.disclaimer));

            // Setting Dialog Message
            alertDialog.setMessage(message);

            // Setting Icon to Dialog
            //alertDialog.setIcon(R.drawable.delete);

            // Setting Positive "Yes" Button
            alertDialog.setPositiveButton(getText(R.string.disclaimer_agree), new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog,int which) {
            Editor editor = settings.edit();
            editor.putBoolean("disclaimeraccept", true);
            editor.commit();
            }
            });

            // Setting Negative "NO" Button
            alertDialog.setNegativeButton(getText(R.string.disclaimer_disagree), new DialogInterface.OnClickListener() {
            public void onClick(DialogInterface dialog, int which) {
            Editor editor = settings.edit();
            editor.putBoolean("disclaimeraccept", false);
            editor.commit();
            context.finish();
            }
            });

            // Showing Alert Message
            alertDialog.show();
            }

            @Override
            public boolean onCreateOptionsMenu(Menu menu) {
            getSupportMenuInflater().inflate(R.menu.action_menu, menu);
            search = menu.findItem(R.id.search);
            SearchView searchView = (SearchView) search.getActionView();
            searchView.setOnQueryTextListener(this);
            SearchManager searchManager = (SearchManager)getSystemService(Context.SEARCH_SERVICE);
            SearchableInfo info = searchManager.getSearchableInfo(getComponentName());
            searchView.setSearchableInfo(info);

            return true;
            }





            @Override
            public boolean onOptionsItemSelected(MenuItem item) {
            switch (item.getItemId()) {
            case android.R.id.home:
            toggle();
            return true;

            case R.id.refresh:
            refreshCurrentFragment();
            return true;
            }

            return super.onOptionsItemSelected(item);
            }

            @Override
            public void onItemClick(AdapterView<?> parent, final View view, int position, long id) 
            {
            // NO OP
            }



            void refreshCurrentFragment()
            {

            }




            @Override
            public void hideProgressbar() {
            // TODO Auto-generated method stub
            pBar.setVisibility(View.GONE);
            }


            @Override
            public void showProgressbar() {
            // TODO Auto-generated method stub
            pBar.setVisibility(View.VISIBLE);
            }



            @Override
            public boolean onQueryTextSubmit(String query) {
            // TODO Auto-generated method stub 
            search.collapseActionView();
            return false;
            }



            @Override
            public boolean onQueryTextChange(String newText) {
            // TODO Auto-generated method stub
            return false;
            }


            @Override
            protected void onNewIntent(Intent intent) {
            super.onNewIntent(intent);
            handleIntent(intent);
            }

            private void handleIntent(Intent intent){
            if(Intent.ACTION_SEARCH.equals(intent.getAction())){
            String searchQuery = intent.getStringExtra(SearchManager.QUERY);
            }
            }

            }

ActionBar.Tab latestTab; ActionBar.Tab AllTab; LatestNewsFragment latestNews; AllNewsFragment allNews; MenuItem search; SearchView searchView; ProgressBar pBar; SharedPreferences settings; protected CategoryListFragment mFrag; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); this.setContentView(R.layout.activity_main); pBar = (ProgressBar) this.findViewById(R.id.pBar); pBar.setVisibility(View.GONE); ImageLoaderConfiguration config = new ImageLoaderConfiguration.Builder(this.getApplicationContext()) .build(); imageLoader = ImageLoader.getInstance(); imageLoader.init(config); options = new DisplayImageOptions.Builder() .showStubImage(R.drawable.poster) .delayBeforeLoading(2000) .showImageForEmptyUri(R.drawable.poster) .showImageOnFail(R.drawable.poster) .bitmapConfig(Bitmap.Config.RGB_565) .imageScaleType(ImageScaleType.NONE) .cacheOnDisc() .cacheInMemory() .build(); Bundle extras = getIntent().getExtras(); latest = extras.getParcelableArrayList("latest"); generes = extras.getParcelableArrayList("generes"); disclaimer = extras.getString("disclaimer"); /* Tabs */ getSupportActionBar().setNavigationMode(ActionBar.NAVIGATION_MODE_TABS); /* Latest list fragment */ latestNews = new LatestNewsFragment(); latestNews.setImagLoader(imageLoader); latestNews.setImageDisplayOptions(options); latestNews.setData(latest); latestTab = getSupportActionBar().newTab().setText("Latest"); latestTab.setTabListener(new TabListener(latestNews)); getSupportActionBar().addTab(latestTab); /* All news list fragment */ allNews = new AllNewsFragment(); allNews.setImagLoader(imageLoader); allNews.setImageDisplayOptions(options); AllTab = getSupportActionBar().newTab().setText("Browse All"); AllTab.setTabListener(new TabListener(allNews)); getSupportActionBar().addTab(AllTab); /* Sliding menu */ // set the Behind View setBehindContentView(R.layout.menu_frame); if (savedInstanceState == null) { FragmentTransaction t = this.getSupportFragmentManager().beginTransaction(); mFrag = new CategoryListFragment(); mFrag.setData(generes); t.replace(R.id.menu_frame, mFrag); t.commit(); } else { mFrag = (CategoryListFragment)this.getSupportFragmentManager().findFragmentById(R.id.menu_frame); } // customize the SlidingMenu SlidingMenu sm = getSlidingMenu(); sm.setShadowWidthRes(R.dimen.shadow_width); sm.setShadowDrawable(R.drawable.shadow); sm.setBehindOffsetRes(R.dimen.slidingmenu_offset); sm.setFadeDegree(0.35f); sm.setTouchModeAbove(SlidingMenu.TOUCHMODE_MARGIN); getSupportActionBar().setDisplayHomeAsUpEnabled(true); getSupportActionBar().setDisplayShowTitleEnabled(false); settings = getSharedPreferences("com.newsspace.mobile.android", Context.MODE_PRIVATE); boolean hasAcceptedPolicy = settings.getBoolean("disclaimeraccept", false); if(!hasAcceptedPolicy) showDisclaimer(this, disclaimer); } void showDisclaimer(final Activity context, String message) { AlertDialog.Builder alertDialog = new AlertDialog.Builder(this); // Setting Dialog Title alertDialog.setTitle(getText(R.string.disclaimer)); // Setting Dialog Message alertDialog.setMessage(message); // Setting Icon to Dialog //alertDialog.setIcon(R.drawable.delete); // Setting Positive "Yes" Button alertDialog.setPositiveButton(getText(R.string.disclaimer_agree), new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog,int which) { Editor editor = settings.edit(); editor.putBoolean("disclaimeraccept", true); editor.commit(); } }); // Setting Negative "NO" Button alertDialog.setNegativeButton(getText(R.string.disclaimer_disagree), new DialogInterface.OnClickListener() { public void onClick(DialogInterface dialog, int which) { Editor editor = settings.edit(); editor.putBoolean("disclaimeraccept", false); editor.commit(); context.finish(); } }); // Showing Alert Message alertDialog.show(); } @Override public boolean onCreateOptionsMenu(Menu menu) { getSupportMenuInflater().inflate(R.menu.action_menu, menu); search = menu.findItem(R.id.search); SearchView searchView = (SearchView) search.getActionView(); searchView.setOnQueryTextListener(this); SearchManager searchManager = (SearchManager)getSystemService(Context.SEARCH_SERVICE); SearchableInfo info = searchManager.getSearchableInfo(getComponentName()); searchView.setSearchableInfo(info); return true; } @Override public boolean onOptionsItemSelected(MenuItem item) { switch (item.getItemId()) { case android.R.id.home: toggle(); return true; case R.id.refresh: refreshCurrentFragment(); return true; } return super.onOptionsItemSelected(item); } @Override public void onItemClick(AdapterView<?> parent, final View view, int position, long id) { // NO OP } void refreshCurrentFragment() { } @Override public void hideProgressbar() { // TODO Auto-generated method stub pBar.setVisibility(View.GONE); } @Override public void showProgressbar() { // TODO Auto-generated method stub pBar.setVisibility(View.VISIBLE); } @Override public boolean onQueryTextSubmit(String query) { // TODO Auto-generated method stub search.collapseActionView(); return false; } @Override public boolean onQueryTextChange(String newText) { // TODO Auto-generated method stub return false; } @Override protected void onNewIntent(Intent intent) { super.onNewIntent(intent); handleIntent(intent); } private void handleIntent(Intent intent){ if(Intent.ACTION_SEARCH.equals(intent.getAction())){ String searchQuery = intent.getStringExtra(SearchManager.QUERY); } } }

public class TabListener实现ActionBar.TabListener {

TabListener.java

}

  

AllNewsFragment.java

Fragment fragment;

public TabListener(Fragment fragment) {
  this.fragment = fragment;
}

@Override
public void onTabSelected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub
    ft.replace(R.id.fragment_container, fragment);
}

@Override
public void onTabUnselected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub
    ft.remove(fragment);
}

@Override
public void onTabReselected(Tab tab, FragmentTransaction ft) {
    // TODO Auto-generated method stub  
}

}

此外，除了无限滚动之外，latestNews Fragment与AllNewsFragment完全相同。我可以在这里张贴是必要的。但我觉得这很好。请帮我找到这个问题的答案。

Answer 1

希望你现在有了解决方案。但无论如何，我通过在init

中移动从if(!activityReady)到onActivityCreated块之后的行来实现它

ListView list = (ListView) this.rootview;
list.setOnScrollListener(this);