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[英]Asynchronous calling and passing values to fragments before setting ViewPager adapter
[英]Calling Adapter from Fragments in ViewPager
我有具有searchview和viewpager的片段。 我的viewpager有3个片段,每个片段都调用适配器。 现在要实现searchview,我需要在view pager中调用可见片段的适配器。
SlidingTab(带有searchview和ViewPager的片段):
<LinearLayout 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:id="@+id/frame_main"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
tools:context="com.RareMediaCompany.BDTrial.SlidingTab">
<include
android:id="@+id/toolbar1"
layout="@layout/toolbar_job" />
<com.RareMediaCompany.BDTrial.Utils.CustomTabLayout
android:id="@+id/sliding_tabs"
style="@style/CustomTabLayout"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="#eeeeee"
app:tabIndicatorColor="#f39220"
app:tabIndicatorHeight="3dp"
app:tabMaxWidth="0dp"
app:tabMode="fixed"
app:tabPaddingEnd="0dp"
app:tabPaddingStart="0dp"
app:tabTextAppearance="@android:style/TextAppearance.Widget.TabWidget"
app:tabSelectedTextColor="#808080" />
<LinearLayout
android:id="@+id/linear1"
android:background="@android:color/white"
android:layout_width="match_parent"
android:layout_height="70dp"
android:orientation="horizontal"
android:weightSum="1">
<android.support.v7.widget.SearchView
android:layout_width="300dp"
android:layout_height="45dp"
android:id="@+id/searchView"
android:layout_weight="0.9"
android:layout_marginRight="5dp"
android:layout_gravity="center"
style="@style/CitySearchView"
android:background="@drawable/searchview"
android:layout_marginLeft="10dp"/>
<LinearLayout
android:id="@+id/list_linearlayout"
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_weight="0"
android:layout_gravity="center"
android:background="#f39220">
<ImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_weight="0.3"
android:src="@drawable/list_icon_white"/>
</LinearLayout>
<LinearLayout
android:layout_width="45dp"
android:layout_height="45dp"
android:layout_gravity="center"
android:layout_weight="0"
android:layout_marginRight="10dp"
android:background="#75aadb">
<ImageView
android:layout_width="20dp"
android:layout_height="wrap_content"
android:layout_marginTop="10dp"
android:layout_marginRight="2dp"
android:layout_weight="0.3"
android:src="@drawable/mapmarker"/>
</LinearLayout>
</LinearLayout>
<!--android:layout_width="320dp"-->
<!--android:layout_height="wrap_content"-->
<!--android:layout_marginLeft="10dp"-->
<!--android:layout_marginTop="10dp"-->
<!--android:id="@+id/searchview"/>-->
<android.support.v4.view.ViewPager
android:id="@+id/view_pager"
android:layout_width="match_parent"
android:layout_height="0dp"
android:layout_weight="1"
android:background="@android:color/white" />
</LinearLayout>
SlidingTab.class(实现SearchView)
public class SlidingTab extends Fragment {
private static final String TAG = "TabLayout";
private static String POSITION = "POSITION";
private Context context;
private SearchView searchview;
private Toolbar toolbar ;
/*searching/filteration query*/
private SearchView.OnQueryTextListener OnQuerySearchView = new SearchView.OnQueryTextListener() {
@Override
public boolean onQueryTextSubmit(String arg0) {
// TODO Auto-generated method stub
return false;
}
@Override
public boolean onQueryTextChange(String arg0) {
// TODO Auto-generated method stub
// if (searchCheck) {
Log.i("Recycler query", arg0);
// Fragment frag = new PageAdapter(getChildFragmentManager(),context).getItem(viewPager.getCurrentItem());
PageAdapter adapter = ((PageAdapter) viewPager.getAdapter());
Fragment fragment = adapter.getFragment(viewPager.getCurrentItem());
return false;
}
};
public SlidingTab() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.sliding_tab, container, false);
viewPager = (ViewPager) v.findViewById(R.id.view_pager);
viewPager.setOffscreenPageLimit(2);
viewPager.setAdapter(new PageAdapter(getChildFragmentManager(), context));
slidingTab = (TabLayout) v.findViewById(R.id.sliding_tabs);
searchview = (SearchView)v.findViewById(R.id.searchView);
searchview.setOnQueryTextListener(OnQuerySearchView);
return v;
}
PageAdapter.class
public class PageAdapter extends FragmentStatePagerAdapter {
private static final String TAG = "PageAdapter";
final int PAGE_COUNT = 3;
private String tabTitles[] = new String[]{"New", "In Progress", "Completed"};
private Context context;
public PageAdapter(FragmentManager fm, Context context) {
super(fm);
this.context = context;
}
@Override
public Fragment getItem(int position) {
Log.d(TAG, "New Instance Created :" + position);
switch (position) {
case 0:
return new JobFragment();
case 1:
return new InProgressJobFragment();
case 2:
return new CompletedJobFragment();
}
return null;
}
@Override
public CharSequence getPageTitle(int position) {
return tabTitles[position];
}
@Override
public int getCount() {
return PAGE_COUNT;
}
}
片段RecyclerView适配器(由视图分页器中的每个片段调用并具有searchview过滤器方法)
public class JobAdapter extends RecyclerView.Adapter<JobAdapter.ViewHolder> {
private static final String TAG = "EMPLOYEE ADAPTER";
private static final int VIEW_NORMAL = 0;
private ArrayList<Info> mDataset;
private ArrayList<Info> filterList;
private Context mAct;
public class ViewHolder extends RecyclerView.ViewHolder {
}
}
public void addApplications(ArrayList<Info> candidates) {
}
public void clearApplications() {
}
public JobAdapter(ArrayList<Info> myDataset, Context context) {
this.mDataset = myDataset;
this.mAct = context;
}
@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.job_card_new, parent, false);
ViewHolder fh = new ViewHolder(v);
return fh;
}
@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
// }
**// *searching/filtration on List*/**
public void filter(String charText) {
filterList.clear();
if (charText.length() == 0) {
if(mDataset != null) {
filterList.addAll(mDataset);
}
} else {
if (mDataset != null){
for (Info wp : mDataset) {
if(wp.jobNumber !=null){
if(Pattern.compile(Pattern.quote(charText), Pattern.CASE_INSENSITIVE).matcher(wp.jobNumber).find()){
// if (wp.heading1.toLowerCase().contains(charText.toLowerCase())) {
filterList.add(wp);
}}else{
}
this.notifyItemRangeRemoved(0, filterList.size());
}
}
}
notifyDataSetChanged();
}
@Override
public int getItemCount() {
return mDataset.size();
}
}
请帮助我在viewpager中实现searchview。
借助上传的代码,我可以告诉我
片段中名为make的搜索方法,并调用适配器过滤器方法
public void search(String text)
{
adapter.filter(text)
}
您可以在此行之后检查片段的实例并调用片段的搜索方法
Fragment fragment = adapter.getFragment(viewPager.getCurrentItem());
我认为,为此的最佳设计是将“ Activity
”用作需要处理碎片的事件的中央“枢纽”。
所以这就是我要做的:
首先从侦听器界面开始。 可以将其声明为Activity
的内部接口:
static interface QueryListener { void onQueryChange(String query); }
Activity获得用于保留侦听器的属性以及用于添加和删除侦听器的方法(声明为同步状态,以防止这些讨厌的ConcurrentModificationException
:
private List<QueryListener> mQueryListeners = new ArrayList<>(); public synchronized void addQueryListener(@NonNull QueryListener listener) { // check if the listener was already added // you could also use a Set instead of a List for this if (mQueryListeners.contains(listener)) return; mQueryListeners.add(listener); } public synchronized void removeQueryListener(@NonNull QueryListener listener) { mQueryListeners.remove(listener); }
Activity还获得了可由SearchView
片段调用的方法:
public synchronized void changeQuery(String query) { for (QueryListener listener : mQueryListeners) { listener.onQueryChange(query); } }
现在,带有适配器的片段需要实现QueryListener
并自行注册/注销:
将此行添加到onCreate()
某处:
((YourActivity) getActivity()).addQueryListener(this);
在onDestroy()
注销:
@Override public void onDestroy() { ((YourActivity) getActivity()).removeQueryListener(this); super.onDestroy(); }
添加QueryListener方法实现:
@Override public void onQueryChange(String query) { // if (isVisible()) { if desired mAdapter.filter(query); }
注意:您不必让片段实现QueryListener
; 您可以使用匿名类。 但是您必须保留对它的引用,以便以后可以调用removeQueryListener()
。
现在,只需连接SearchView
:
@Override public boolean onQueryTextChange(String query) { ((YourActivity) getActivity()).changeQuery(query); }
我使用的另一种模式是创建一个专用类来注册/通知侦听器。 我创建了此类的单个实例,并在Activity上有一个方法可以访问它:
QueryHandler handler = ((YourActivity) getActivity()).getQueryHandler();
// QueryHandler has all the listener properties and methods shown for the Activity
...
handler.changeQuery(query);
或者,您也可以使用许多开源事件总线程序包(例如Otto)之一在片段之间传递事件。
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