我正在开发android应用，我已经实现了searchview，但是当我开始在搜索栏中搜索新闻
I am getting following exception
进程：edgar.yodgorbek.sportnews，PID：5146 java.util.ConcurrentModificationException 在java.util.ArrayList $ Itr.next（ArrayList.java:860） 在edgar.yodgorbek.sportnews.sportactivities.BBCSportFragment.doFilter（BBCSportFragment.java:126） 在edgar.yodgorbek.sportnews.MainActivity $ 1.onQueryTextChange（MainActivity.java:126）
在BBCSportFragment.java下面
public class BBCSportFragment extends Fragment implements ArticleAdapter.ClickListener {
public static List<Article> articleList = new ArrayList<>();
public List<Search> searchList = new ArrayList<>();
@ActivityContext
public Context activityContext;
Search search;
@ApplicationContext
public Context mContext;
@BindView(R.id.recycler_view)
RecyclerView recyclerView;
BBCSportFragmentComponent bbcSportFragmentComponent;
BBCFragmentContextModule bbcFragmentContextModule;
private SportNews sportNews;
private static ArticleAdapter articleAdapter;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_bbcsport, container, false);
ButterKnife.bind(this, view);
SportInterface sportInterface = SportClient.getApiService();
Call<SportNews> call = sportInterface.getArticles();
call.enqueue(new Callback<SportNews>() {
@Override
public void onResponse(Call<SportNews> call, Response<SportNews> response) {
if (response == null) {
sportNews = response.body();
if (sportNews != null && sportNews.getArticles() != null) {
articleList.addAll(sportNews.getArticles());
}
articleAdapter = new ArticleAdapter(articleList, sportNews);
ApplicationComponent applicationComponent;
applicationComponent = (ApplicationComponent) MyApplication.get(Objects.requireNonNull(getActivity())).getApplicationContext();
bbcSportFragmentComponent = (BBCSportFragmentComponent) DaggerApplicationComponent.builder().contextModule(new ContextModule(getContext())).build();
bbcSportFragmentComponent.injectBBCSportFragment(BBCSportFragment.this);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext(applicationComponent));
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(articleAdapter);
}
}
@Override
public void onFailure(Call<SportNews> call, Throwable t) {
}
});
SportInterface searchInterface = SportClient.getApiService();
Call<Search> searchCall = searchInterface.getSearchViewArticles("q");
searchCall.enqueue(new Callback<Search>() {
@Override
public void onResponse(Call<Search> call, Response<Search> response) {
search = response.body();
if (search != null && search.getArticles() != null) {
articleList.addAll(search.getArticles());
}
articleAdapter = new ArticleAdapter(articleList, search);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(layoutManager);
recyclerView.setAdapter(articleAdapter);
}
@Override
public void onFailure(Call<Search> call, Throwable t) {
}
});
return view;
}
private Context getContext(ApplicationComponent applicationComponent) {
return null;
}
public static void doFilter(String searchQuery) {
searchQuery = searchQuery.toLowerCase();
for(Article article: articleList){
final String text = "";
if (text.equals(searchQuery))
articleList.add(article);
}
articleList.clear();
if(articleList.isEmpty())
articleAdapter.notifyDataSetChanged();
}
}
MainActivity.java下面
public class MainActivity extends AppCompatActivity {
private DrawerLayout mDrawer;
private Toolbar toolbar;
private NavigationView nvDrawer;
private ActionBarDrawerToggle drawerToggle;
Context mContext;
// Default active navigation menu
int mActiveMenu;
// TAGS
public static final int MENU_FIRST = 0;
public static final int MENU_SECOND = 1;
public static final int MENU_THIRD = 2;
public static final int MENU_FOURTH = 3;
public static final int MENU_FIFTH = 3;
public static final String TAG = "crash";
// Action bar search widget
SearchView searchView;
String searchQuery = "";
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
// Set a Toolbar to replace the ActionBar.
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
// Find our drawer view
mDrawer = (DrawerLayout) findViewById(R.id.drawer_layout);
drawerToggle = setupDrawerToggle();
// Tie DrawerLayout events to the ActionBarToggle
mDrawer.addDrawerListener(drawerToggle);
nvDrawer = (NavigationView) findViewById(R.id.nvView);
// Inflate the header view at runtime
View headerLayout = nvDrawer.inflateHeaderView(R.layout.nav_header);
// We can now look up items within the header if needed
ImageView ivHeaderPhoto = (ImageView) headerLayout.findViewById((R.id.header_image));
ivHeaderPhoto.setImageResource(R.drawable.ic_sportnews);
setupDrawerContent(nvDrawer);
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, new BBCSportFragment()).commit();
fragmentManager.beginTransaction().replace(R.id.flContent, new FoxSportsFragment()).commit();
fragmentManager.beginTransaction().replace(R.id.flContent, new TalkSportsFragment()).commit();
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
// The action bar home/up action should open or close the drawer.
switch (item.getItemId()) {
case android.R.id.home:
mDrawer.openDrawer(GravityCompat.START);
return true;
}
return super.onOptionsItemSelected(item);
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu, menu);
// Getting search action from action bar and setting up search view
MenuItem searchItem = menu.findItem(R.id.action_search);
SearchView searchView = (SearchView) searchItem.getActionView();
// Setup searchView
setupSearchView(searchView);
Log.e(TAG,"crash");
return true;
}
public void setupSearchView(SearchView searchView) {
SearchManager searchManager = (SearchManager) this.getSystemService(Context.SEARCH_SERVICE);
if (searchManager != null) {
SearchableInfo info = searchManager.getSearchableInfo(getComponentName());
searchView.setSearchableInfo(info);
}
searchView.setOnQueryTextListener(new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextChange(String newText) {
searchQuery = newText;
// Load search data on respective fragment
if (mActiveMenu == MENU_FIRST) // First
{
BBCSportFragment.doFilter(newText);
}
if (mActiveMenu == MENU_SECOND) // First
{
BBCSportFragment.doFilter(newText);
}
if (mActiveMenu == MENU_THIRD) // First
{
BBCSportFragment.doFilter(newText);
}
if (mActiveMenu == MENU_FOURTH) // First
{
BBCSportFragment.doFilter(newText);
} else if (mActiveMenu == MENU_FIFTH) // Second
{
ESPNFragment.doFilter(newText);
}
return true;
}
@Override
public boolean onQueryTextSubmit(String query) {
//searchView.clearFocus();
return false;
}
});
// Handling focus change of search view
searchView.setOnQueryTextFocusChangeListener(new View.OnFocusChangeListener() {
@Override
public void onFocusChange(View v, boolean hasFocus) {
// Focus changed after pressing back key or pressing done in keyboard
if (!hasFocus) {
searchQuery = "";
}
}
});
}
private void setupDrawerContent(NavigationView navigationView) {
navigationView.setNavigationItemSelectedListener(
menuItem -> {
selectDrawerItem(menuItem);
return true;
});
}
public void selectDrawerItem(MenuItem menuItem) {
// Create a new fragment and specify the fragment to show based on nav item clicked
Fragment fragment = null;
Class fragmentClass = null;
switch (menuItem.getItemId()) {
case R.id.bbcsports_fragment:
fragmentClass = BBCSportFragment.class;
break;
case R.id.talksports_fragment:
fragmentClass = TalkSportsFragment.class;
break;
case R.id.foxsports_fragment:
fragmentClass = FoxSportsFragment.class;
break;
case R.id.footballitalia_fragment:
fragmentClass = FootballItaliaFragment.class;
break;
case R.id.espn_fragment:
fragmentClass = ESPNFragment.class;
break;
default:
}
try {
fragment = (Fragment) fragmentClass.newInstance();
} catch (Exception e) {
e.printStackTrace();
}
// Insert the fragment by replacing any existing fragment
FragmentManager fragmentManager = getSupportFragmentManager();
fragmentManager.beginTransaction().replace(R.id.flContent, fragment).commit();
// Highlight the selected item has been done by NavigationView
menuItem.setChecked(true);
// Set action bar title
setTitle(menuItem.getTitle());
// Close the navigation drawer
mDrawer.closeDrawers();
}
private ActionBarDrawerToggle setupDrawerToggle() {
// NOTE: Make sure you pass in a valid toolbar reference. ActionBarDrawToggle() does not require it
// and will not render the hamburger icon without it.
return new ActionBarDrawerToggle(this, mDrawer, toolbar, R.string.drawer_open, R.string.drawer_close);
}
@Override
protected void onPostCreate(Bundle savedInstanceState) {
super.onPostCreate(savedInstanceState);
// Sync the toggle state after onRestoreInstanceState has occurred.
drawerToggle.syncState();
}
@Override
public void onConfigurationChanged(Configuration newConfig) {
super.onConfigurationChanged(newConfig);
// Pass any configuration change to the drawer toggles
drawerToggle.onConfigurationChanged(newConfig);
}
}
答案 0 :(得分：0)
根据WebService的响应，创建一个数据列表副本。喜欢，
// define globally
public static List<Article> origArticleList = new ArrayList<>();
//Add below two line after "articleList.addAll(search.getArticles());"
origArticleList.clear();
origArticleList.addAll(search.getArticles());
并更改这样的doFilter方法。
public static void doFilter(String searchQuery) {
searchQuery = searchQuery.toLowerCase();
articleList.clear();
for(Article article: origArticleList){
final String text = "";
if (text.equals(searchQuery))
articleList.add(article);
}
articleAdapter.notifyDataSetChanged();
}