Android标签视图片段Recycler视图搜索过滤器 [英] android tab view fragment Recycler view search filter
问题描述
我想用来自sqlite数据库的数据在Tab视图片段中实施搜索过滤器，但是经过了三天的时间这个最终没有成功，我遇到了
I want to implement search filter in Tab view Fragment with data from sqlite database ,after more that three days of being though this and this without success finally i came across this which is seems to be clean idea since am kind new to android development. i tried to implement it but does not seems to work it means search menu item not inflating also i get no result, i do not have idea where do i get t wrong and there is no error at all, any idea on what is wrong and how to make it work.
这是片段代码
public class TabFragment3 extends Fragment implements SearchView.OnQueryTextListener {
private RecyclerView recyclerView;
private LinearLayoutManager layoutManager;
private UsersAdapter adapter;
ArrayList<HashMap<String, String>> arrayList;
DBController controller = new DBController(getContext());
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View view =inflater.inflate(R.layout.tab_fragment_3, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.usersList);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(getContext());
recyclerView.setLayoutManager(layoutManager);
controller = new DBController(getContext());
arrayList = controller.getAllUsers();
adapter = new UsersAdapter(arrayList,getContext());
recyclerView.setAdapter(adapter);
adapter.notifyDataSetChanged();
return view;
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
final MenuItem item = menu.findItem(R.id.action_search);
final SearchView searchView = (SearchView) MenuItemCompat.getActionView(item);
searchView.setOnQueryTextListener(this);
MenuItemCompat.setOnActionExpandListener(item,new MenuItemCompat.OnActionExpandListener() {
@Override
public boolean onMenuItemActionCollapse(MenuItem item) {
arrayList = controller.getAllUsers();
// Do something when collapsed
adapter.setFilter(arrayList);
return true; // Return true to collapse action view
}
@Override
public boolean onMenuItemActionExpand(MenuItem item) {
// Do something when expanded
return true; // Return true to expand action view
}
});
}
@Override
public boolean onQueryTextChange(String query) {
return false;
}
@Override
public boolean onQueryTextSubmit(String newText) {
// Here is where we are going to implement the filter logic
newText = newText.toLowerCase();
ArrayList<HashMap<String, String>> userlist = controller.getAllUsers();
ArrayList<HashMap<String, String>> newList= new ArrayList<>();
for(HashMap<String, String> entry : userlist){
String name2= entry.get("number").toLowerCase();
if(name2.contains(newText)){
newList.add(entry);
}}
adapter.setFilter(newList);
return true;
}
}
/// adapter class
public class UsersAdapter extends RecyclerView.Adapter<UsersAdapter.UserViewHolder> {
ArrayList<HashMap<String, String>> mDataSet= new ArrayList<HashMap<String, String>> ();
Context ctx;
public UsersAdapter(ArrayList<HashMap<String, String>> mDataSet,Context ctx) {
this.mDataSet = mDataSet;
this.ctx=ctx;
}
@Override
public UserViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.user_row, parent, false);
UserViewHolder userViewHolder = new UserViewHolder(v,mDataSet,ctx);
return userViewHolder;
}
@Override
public void onBindViewHolder(UserViewHolder holder, int position) {
holder.name_entry.setText(mDataSet.get(position).get("userId"));
holder.email_entry.setText(mDataSet.get(position).get("userName"));
holder.icon_entry.setText(""+mDataSet.get(position).get("number"));
}
@Override
public int getItemCount() {
return mDataSet.size();
}
public static class UserViewHolder extends RecyclerView.ViewHolder {
CardView cardView;
TextView name_entry, email_entry, icon_entry;
Context ctx;
ArrayList<HashMap<String, String>> mDataSet= new ArrayList<HashMap<String, String>> ();
public UserViewHolder(View itemView, ArrayList<HashMap<String, String>> mDataSet,Context ctx) {
super(itemView);
this.mDataSet=mDataSet;
this.ctx= ctx;
cardView = (CardView) itemView.findViewById(R.id.user_layout);
name_entry = (TextView) itemView.findViewById(R.id.name_entry);
email_entry = (TextView) itemView.findViewById(R.id.email_entry);
icon_entry = (TextView) itemView.findViewById(R.id.icon_entry);
}
}
@Override
public void onAttachedToRecyclerView(RecyclerView recyclerView) {
super.onAttachedToRecyclerView(recyclerView);
}
public void setFilter(ArrayList<HashMap<String, String>> newList){
mDataSet= new ArrayList<HashMap<String, String>>();
mDataSet.addAll(newList);
notifyDataSetChanged();
}
}
///主要
public class MainActivity extends AppCompatActivity implements TabLayout.OnTabSelectedListener,SearchView.OnQueryTextListener {
private ViewPager viewPager;
PagerAdapter adapter;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
TabLayout tabLayout = (TabLayout) findViewById(R.id.tab_layout);
tabLayout.addTab(tabLayout.newTab().setText("Tab 1"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 2"));
tabLayout.addTab(tabLayout.newTab().setText("Tab 3"));
tabLayout.setTabGravity(TabLayout.GRAVITY_FILL);
final ViewPager viewPager = (ViewPager) findViewById(R.id.pager);
adapter = new PagerAdapter
(getSupportFragmentManager(), tabLayout.getTabCount());
viewPager.setAdapter(adapter);
viewPager.addOnPageChangeListener(new TabLayout.TabLayoutOnPageChangeListener(tabLayout));
tabLayout.setOnTabSelectedListener(new TabLayout.OnTabSelectedListener() {
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
});
}
@Override
public void onTabSelected(TabLayout.Tab tab) {
viewPager.setCurrentItem(tab.getPosition());
}
@Override
public void onTabUnselected(TabLayout.Tab tab) {
}
@Override
public void onTabReselected(TabLayout.Tab tab) {
}
@Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.menu_main, menu);
return true;
}
@Override
public boolean onOptionsItemSelected(MenuItem item) {
int id = item.getItemId();
return super.onOptionsItemSelected(item);
}
public boolean onQueryTextSubmit(String query)
{ return false;
}
@Override
public boolean onQueryTextChange(String newText) {
return false;
}
}
推荐答案
-
在TabFragment3的
onCreateView()方法中添加setHasOptionsMenu(true).它告诉主机活动，您的片段具有要添加的菜单选项.
Add
setHasOptionsMenu(true)in your TabFragment3'sonCreateView()method. It tells the host activity that your fragment has menu options that it wants to add.
还添加super.onCreateOptionsMenu(menu,inflater) ..
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
super.onCreateOptionsMenu(menu,inflater);
}
@Override
public void onCreateOptionsMenu(Menu menu, MenuInflater inflater) {
inflater.inflate(R.menu.menu_main, menu);
super.onCreateOptionsMenu(menu,inflater);
}
在MainActivity的onOptionsItemSelected(MenuItem item) 返回false 内，因为菜单项操作将在TabFragment3的onOptionsItemSelected(MenuItem item)中进行处理.
Inside the MainActivity's onOptionsItemSelected(MenuItem item) return false, as the Menu item action would be hanlded in TabFragment3's onOptionsItemSelected(MenuItem item).
这篇关于Android标签视图片段Recycler视图搜索过滤器的文章就介绍到这了，希望我们推荐的答案对大家有所帮助，也希望大家多多支持IT屋！
