在我的项目中，我试图在3个标签中显示Recycleview。在我的拳头选项卡中，我能够成功地在recycleview中显示项目。但在我的第二个标签片段中它不起作用。请参阅我的标签布局
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/lib/zesteve.com.myapplication"
android:layout_width="match_parent"
xmlns:app1="http://schemas.android.com/apk/res-auto"
android:orientation="vertical"
android:layout_height="wrap_content">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<android.support.design.widget.TabLayout
android:id="@+id/tabs"
app:tabGravity="fill"
android:layout_width="match_parent"
android:layout_height="40dp"
app:tabMode="fixed"
android:elevation="10dp"
style="@style/NavigationTab"/>
<android.support.v4.view.ViewPager
android:id="@+id/viewpager"
android:layout_width="match_parent"
android:layout_height="match_parent">
</android.support.v4.view.ViewPager>
</LinearLayout>
<android.support.design.widget.FloatingActionButton
app:backgroundTint="@color/colorPrimary"
android:layout_width="56dp"
android:layout_height="56dp"
app:fabSize="normal"
android:layout_gravity="bottom|right"
android:src="@drawable/ic_action_fab_act_btn"
android:id="@+id/post_new_event"
android:layout_margin="16dp"/>
</FrameLayout>
和Tabfragement.java
public class TabFragment extends Fragment {
public static TabLayout tabLayout;
public static ViewPager viewPager;
public static int int_items = 3 ;
FloatingActionButton fab;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View x = inflater.inflate(R.layout.tab_layout,container, false);
tabLayout = (TabLayout) x.findViewById(R.id.tabs);
viewPager = (ViewPager) x.findViewById(R.id.viewpager);
//tabLayout.setTabMode(TabLayout.MODE_SCROLLABLE);
viewPager.setAdapter(new MyAdapter(getChildFragmentManager()));
fab = (FloatingActionButton) x.findViewById(R.id.post_new_event);
fab.setBackgroundTintList(ColorStateList.valueOf(getResources().getColor(R.color.cpb_blue)));
fab.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
Intent intent = new Intent(getActivity(),PostNewEvent.class);
startActivity(intent);
}
});
tabLayout.post(new Runnable() {
@Override
public void run() {
tabLayout.setupWithViewPager(viewPager);
}
});
return x;
}
class MyAdapter extends FragmentStatePagerAdapter{
public MyAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position)
{
switch (position){
case 0 : return new PrimaryFragment();
case 1 : return new CityFeedFragment();
case 2 : return new BuzzFragment();
}
return null;
}
@Override
public int getCount() {
return int_items;
}
@Override
public CharSequence getPageTitle(int position) {
switch (position){
case 0 :
return "Category";
case 1 :
return "City Feeds";
case 2 :
return "Buzz";
}
return null;
}
}
}
我的第二个标签适配器
public class CityfeedAdapter extends RecyclerView.Adapter<CityfeedAdapter.MyViewHolder>{
Context mContext;
ArrayList<Cityfeed> cityfeedList = new ArrayList<Cityfeed>();
private MaterialRippleLayout mRipple;
public CityfeedAdapter(Context mContext, ArrayList<Cityfeed> cityfeedList){
this.mContext = mContext;
this.cityfeedList = cityfeedList;
}
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View itemView = LayoutInflater.from(parent.getContext())
.inflate(R.layout.city_feed_card, parent, false);
return new MyViewHolder(itemView,mContext,cityfeedList);
}
@Override
public void onBindViewHolder(final MyViewHolder holder, int position) {
Cityfeed catlist = cityfeedList.get(position);
holder.title.setText(catlist.getName());
holder.count.setText(catlist.getNumOfEvents() + " Events");
// loading album cover using Picasso library
Picasso.with(mContext).load(catlist.getThumbnail()).into(holder.thumbnail);
}
@Override
public int getItemCount() {
return cityfeedList.size();
}
public class MyViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
public TextView title, count;
public ImageView thumbnail;
ArrayList<Cityfeed> cityfeedList = new ArrayList<Cityfeed>();
Context mContext;
public MyViewHolder(View view , Context mContext, ArrayList<Cityfeed> cityfeedList ) {
super(view);
this.cityfeedList = cityfeedList;
this.mContext = mContext;
//view.setOnClickListener(this);
title = (TextView) view.findViewById(R.id.title);
count = (TextView) view.findViewById(R.id.count);
thumbnail = (ImageView) view.findViewById(R.id.thumbnail);
mRipple = (MaterialRippleLayout) view.findViewById(R.id.ripple);
MaterialRippleLayout.on(mRipple).create();
mRipple.setOnClickListener(this);
}
@Override
public void onClick(View view) {
int position = getAdapterPosition();
Cityfeed cityfeedList = this.cityfeedList.get(position);
Intent intent = new Intent(this.mContext, EventPostList.class);
intent.putExtra("EveId", cityfeedList.getEventId());
intent.putExtra("EveName", cityfeedList.getName());
this.mContext.startActivity(intent);
}
}
}
第二个标签片段
public class CityFeedFragment extends Fragment {
private RecyclerView recyclerView;
private CityfeedAdapter adapter;
private ArrayList<Cityfeed> cityfeedList;
private Session session;
private GridLayoutManager mLayoutManager;
private ProgressDialog progressDialog;
String ucl;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
View root = LayoutInflater.from(container.getContext()).inflate(R.layout.cityfeed_layout,container,false);
recyclerView = (RecyclerView) root.findViewById(R.id.crecycler_view);
progressDialog = new ProgressDialog(getActivity());
progressDialog.setCancelable(false);
cityfeedList = new ArrayList<>();
adapter = new CityfeedAdapter(getActivity(), cityfeedList);
session = new Session(getActivity());
load_data_from_server(0);
mLayoutManager= new GridLayoutManager(getActivity(),3);
recyclerView.setLayoutManager(mLayoutManager);
recyclerView.addItemDecoration(new GridSpacingItemDecoration(3, dpToPx(10), true));
recyclerView.setItemAnimator(new DefaultItemAnimator());
recyclerView.setAdapter(adapter);
ucl = session.getUserLocation().get(session.KEY_UCITY);
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
@Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
//super.onScrolled(recyclerView, dx, dy);
if(mLayoutManager.findLastCompletelyVisibleItemPosition() == cityfeedList.size()-1){
load_data_from_server(cityfeedList.get(cityfeedList.size()-1).getEventId());
}
}
});
return root;
}
private void load_data_from_server(int id){
progressDialog.setMessage("Loading Please Wait...");
showDialog();
AsyncTask<Integer,Void,Void> task = new AsyncTask<Integer, Void, Void>() {
@Override
protected Void doInBackground(Integer... integers) {
OkHttpClient client = new OkHttpClient();
okhttp3.Request request = new okhttp3.Request.Builder()
.url("http://api.zesteve.com/catagory.php?city="+ucl+"&id="+integers[0])
.build();
try {
Response response = client.newCall(request).execute();
JSONArray array = new JSONArray(response.body().string());
for (int i=0; i<array.length(); i++){
JSONObject object =array.getJSONObject(i);
Cityfeed events = new Cityfeed(object.getString("eventname"),
object.getInt("count"),
object.getInt("eveid"),
object.getString("event_image"));
cityfeedList.add(events);
}
}catch (IOException e){
e.printStackTrace();
} catch (JSONException e) {
System.out.println("End of Catagory");
}
return null;
}
@Override
protected void onPostExecute(Void aVoid) {
hideDialog();
adapter.notifyDataSetChanged();
}
};
task.execute(id);
}
public class GridSpacingItemDecoration extends RecyclerView.ItemDecoration {
private int spanCount;
private int spacing;
private boolean includeEdge;
public GridSpacingItemDecoration(int spanCount, int spacing, boolean includeEdge) {
this.spanCount = spanCount;
this.spacing = spacing;
this.includeEdge = includeEdge;
}
@Override
public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) {
int position = parent.getChildAdapterPosition(view); // item position
int column = position % spanCount; // item column
if (includeEdge) {
outRect.left = spacing - column * spacing / spanCount; // spacing - column * ((1f / spanCount) * spacing)
outRect.right = (column + 1) * spacing / spanCount; // (column + 1) * ((1f / spanCount) * spacing)
if (position < spanCount) { // top edge
outRect.top = spacing;
}
outRect.bottom = spacing; // item bottom
} else {
outRect.left = column * spacing / spanCount; // column * ((1f / spanCount) * spacing)
outRect.right = spacing - (column + 1) * spacing / spanCount; // spacing - (column + 1) * ((1f / spanCount) * spacing)
if (position >= spanCount) {
outRect.top = spacing; // item top
}
}
}
}
private void showDialog() {
if (!progressDialog.isShowing())
progressDialog.show();
}
private void hideDialog() {
if (progressDialog.isShowing())
progressDialog.dismiss();
}
/**
* Converting dp to pixel
*/
private int dpToPx(int dp) {
Resources r = getResources();
return Math.round(TypedValue.applyDimension(TypedValue.COMPLEX_UNIT_DIP, dp, r.getDisplayMetrics()));
}
@Override
public void onResume() {
super.onResume();
load_data_from_server(0);
}
}
我的第二个标签的XML布局
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:orientation="vertical"
android:layout_width="match_parent"
android:layout_height="match_parent">
<include layout="@layout/content_cityfeed" />
</RelativeLayout>
和
<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout 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:layout_width="match_parent"
android:layout_height="match_parent"
android:background="@color/viewBg"
app:layout_behavior="@string/appbar_scrolling_view_behavior"
tools:context="zesteve.com.myapplication.CityFeedFragment"
tools:showIn="@layout/cityfeed_layout">
<android.support.v7.widget.RecyclerView
android:id="@+id/crecycler_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:clipToPadding="false"
android:scrollbars="vertical" />
</RelativeLayout>
这是我的Cardview
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:card_view="http://schemas.android.com/apk/res-auto"
android:layout_width="match_parent"
android:layout_height="wrap_content"
xmlns:app="http://schemas.android.com/apk/res-auto">
<android.support.v7.widget.CardView
android:id="@+id/card_view"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_gravity="center"
android:layout_margin="@dimen/card_margin"
android:elevation="8dp"
card_view:cardCornerRadius="@dimen/card_album_radius">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="match_parent">
<com.balysv.materialripple.MaterialRippleLayout
android:id="@+id/ripple"
android:layout_centerInParent="true"
android:layout_width="match_parent"
android:layout_height="match_parent"
app:mrl_rippleOverlay="true"
app:mrl_rippleColor="#000"
app:mrl_rippleAlpha="0.2"
app:mrl_rippleDimension="10dp"
app:mrl_rippleHover="true"
app:mrl_rippleRoundedCorners="10dp"
app:mrl_rippleInAdapter="false"
app:mrl_rippleDuration="350"
app:mrl_rippleFadeDuration="75"
app:mrl_rippleDelayClick="false"
app:mrl_rippleBackground="#FFF"
app:mrl_ripplePersistent="true">
<ImageView
android:id="@+id/thumbnail"
android:layout_width="match_parent"
android:layout_height="160dp"
android:background="?attr/selectableItemBackgroundBorderless"
android:scaleType="fitXY" />
</com.balysv.materialripple.MaterialRippleLayout>
<LinearLayout
android:id="@+id/framlayout"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="#80000000" >
<TextView
android:id="@+id/title"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingLeft="@dimen/album_title_padding"
android:paddingRight="@dimen/album_title_padding"
android:paddingTop="@dimen/album_title_Top"
android:paddingBottom="3dp"
android:textColor="@color/white"
android:textSize="@dimen/album_title" />
<TextView
android:id="@+id/count"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:paddingBottom="@dimen/songs_count_padding_bottom"
android:paddingLeft="@dimen/album_title_padding"
android:paddingRight="@dimen/album_title_padding"
android:textColor="@color/white"
android:textSize="@dimen/songs_count" />
</LinearLayout>
</RelativeLayout>
</android.support.v7.widget.CardView>
</FrameLayout>
我希望我没有错过任何事情。 Recyleview没有在我的第二个标签片段中显示任何内容。当我在浏览器中检查时，我的Json响应正常，它显示响应，但不显示在片段中。
答案 0 :(得分：1)
api中有错误：
在解析JSONArray时尝试这个：
Cityfeed events = new Cityfeed(object.has("eventname")?object.getString("eventname"):"",
object.has("count")?object.getInt("count"):0,
object.has("eveid")?object.getInt("eveid"):"",
object.has("event_image")?object.getString("event_image"):"");
希望这有帮助。