Thomas Scarecrow Maveric Thomas Scarecrow Maveric - 2 months ago 11
Android Question

array adapter returns null

i have two adapters and a fragment, and i want to display feeds on two views, one bottom and one recycler view. Although the Json was working with a list adapter. its not working with the recycler view.

here is the main fragment

import it.gmariotti.cardslib.library.internal.Card;
import it.gmariotti.cardslib.library.internal.CardExpand;
import it.gmariotti.cardslib.library.internal.CardHeader;
import it.gmariotti.cardslib.library.view.CardViewNative;
import jp.co.recruit_lifestyle.android.widget.WaveSwipeRefreshLayout;


public class FeedFragmentAlternative extends Fragment{
private static final String TAG = FeedFragmentAlternative.class.getSimpleName();

private String URL_FEED = "http://api.androidhive.info/feed/feed.json";

private WaveSwipeRefreshLayout mWaveSwipeRefresh;
int duration = 200;

private List<FeedItem> FeedItems;

public static FeedFragmentAlternative newInstance(){
FeedFragmentAlternative feedFragmentAlternative = new FeedFragmentAlternative();
return feedFragmentAlternative;
}

private void refresh(){
new Handler().postDelayed(new Runnable() {
@Override
public void run() {
mWaveSwipeRefresh.setRefreshing(false);
}
},3000);
}

private ExpandablePager pager;

@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.feed_activity_alternate, container, false);
final List<FeedItem> myFeedList = new ArrayList<>();
final FeedExpandableAdapter adapter = new FeedExpandableAdapter(myFeedList);
pager = (ExpandablePager) getActivity().findViewById(R.id.bottom_feed_container);
pager.setAdapter(adapter);
pager.setOnSliderStateChangeListener(new OnSliderStateChangeListener() {
@Override
public void onStateChanged(View page, int index, int state) {
toggleContent(page, state, duration);
}

@Override
public void onPageChanged(View page, int index, int state) {
toggleContent(page, state, 0);
}
});

final RecyclerView mRecyclerView = (RecyclerView) getActivity().findViewById(R.id.feeds_list_recycler_view);
mRecyclerView.setHasFixedSize(true);

final FeedGridAdapter a = new FeedGridAdapter(myFeedList);
a.setListener(new OnItemClickedListener() {
@Override
public void onItemClicked(int index) {
pager.setCurrentItem(index, false);
pager.animateToState(ExpandablePager.STATE_EXPANDED);
}
});

mWaveSwipeRefresh = (WaveSwipeRefreshLayout)view.findViewById(R.id.feed_wave_swipe_layout_refresh_alternate);
mWaveSwipeRefresh.setColorSchemeColors(Color.WHITE, Color.GREEN);
mWaveSwipeRefresh.setOnRefreshListener(new WaveSwipeRefreshLayout.OnRefreshListener() {
@Override
public void onRefresh() {
pager.setAdapter(adapter);
mRecyclerView.setAdapter(a);
FeedFragmentAlternative.newInstance();
refresh();
}
});

mWaveSwipeRefresh.setWaveColor(Color.parseColor("#80C5EFF7"));
mWaveSwipeRefresh.setMaxDropHeight((int)(mWaveSwipeRefresh.getHeight() * 0.9));
mRecyclerView.setAdapter(a);

Cache cache = AppController.getInstance().getRequestQueue().getCache();
Cache.Entry entry = cache.get(URL_FEED);
if (entry != null){
try {
String data = new String (entry.data, "UTF-8");
try {
parseJsonFeed(new JSONObject(data));
} catch (JSONException e){
e.printStackTrace();
}
}catch (UnsupportedEncodingException e){
e.printStackTrace();
}
} else {
JsonObjectRequest jsonReq = new JsonObjectRequest(Request.Method.GET,
URL_FEED, null, new Response.Listener<JSONObject>() {
@Override
public void onResponse(JSONObject response) {
VolleyLog.d(TAG, "Response:" + response.toString());
if (response != null){
parseJsonFeed(response);
}
}
},new Response.ErrorListener(){
@Override
public void onErrorResponse(VolleyError error) {
VolleyLog.d(TAG, "ERROR:" + error.getMessage());
}
});

AppController.getInstance().addToRequestQueue(jsonReq);
}
return view;
}

private void toggleContent(final View page, final int state, int duration){
final int headerHeight = (int) getResources().getDimension(R.dimen.header_height);
if (page != null){
ValueAnimator animator = state == ExpandablePager.STATE_EXPANDED ? ValueAnimator.ofFloat(1,0): ValueAnimator.ofFloat(0,1);
animator.addUpdateListener(new ValueAnimator.AnimatorUpdateListener() {
@Override
public void onAnimationUpdate(ValueAnimator animation) {
page.findViewById(R.id.profile_name_header).setTranslationY(25 * (1 - ((Float) animation.getAnimatedValue())));
page.findViewById(R.id.profile_name_header).setTranslationX(-headerHeight * (1 - ((Float)animation.getAnimatedValue())));
page.findViewById(R.id.feed_time_stamp_header).setAlpha(((Float)animation.getAnimatedValue()));
page.findViewById(R.id.profile_pic_header_image).setAlpha(((Float)animation.getAnimatedValue()));
page.findViewById(R.id.feed_like_bottom_sheet).setAlpha(((Float) animation.getAnimatedValue()));
}
});
animator.setDuration((long)(duration * 5));
animator.setInterpolator(new FastOutSlowInInterpolator());
animator.start();
}
}

private void parseJsonFeed(JSONObject response){
try {
JSONArray feedArray = response.getJSONArray("feed");
for (int i = 0;i < feedArray.length(); i++){
JSONObject feedObj = (JSONObject) feedArray.get(i);

FeedItem item = new FeedItem();
item.setId(feedObj.getInt("id"));
item.setName(feedObj.getString("name"));

String image = feedObj.isNull("image")? null : feedObj
.getString("image");
item.setImge(image);
item.setStatus(feedObj.getString("status"));
item.setProfilePic(feedObj.getString("profilePic"));
item.setTimeStamp(feedObj.getString("timeStamp"));

String feedUrl = feedObj.isNull("url")? null : feedObj
.getString("url");
item.setUrl(feedUrl);

FeedItems.add(item);
}

} catch (JSONException e){
e.printStackTrace();
}
}

@Override
public void onActivityCreated(@Nullable Bundle savedInstanceState) {
super.onActivityCreated(savedInstanceState);

initCards();
}

private void initCards(){
init_standard_header_with_expandcollapse_button();
}
private void init_standard_header_with_expandcollapse_button(){
Card card = new Card(getActivity());
CardHeader header = new CardHeader(getActivity());
header.setButtonExpandVisible(true);
card.addCardHeader(header);
CardExpand expand = new CardExpand(getActivity());
expand.setTitle("expanded");
CardViewNative cardViewNative = (CardViewNative) getActivity().findViewById(R.id.feed_card_style);
cardViewNative.setCard(card);
}
}


the grid adapter is as follows

public class FeedGridAdapter extends RecyclerView.Adapter<FeedGridAdapter.ViewHolder> {
private OnItemClickedListener listener;
private List<FeedItem> mFeedItems;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();

public static class ViewHolder extends RecyclerView.ViewHolder{
public LoginTextView ProfileNameCell;
public LoginTextView FeedTimesStampCell;
public NetworkImageView ProfilepicCell;
public LoginTextView FeedStatusMgsCell;
public FeedImageView FeedImageViewCell;
public ViewGroup container;

public ViewHolder(RelativeLayout v){
super(v);
container = v;
ProfileNameCell = (LoginTextView) v.findViewById(R.id.client_name_alternate_cell);
FeedTimesStampCell = (LoginTextView) v.findViewById(R.id.time_stamp_alternate_cell);
ProfilepicCell = (NetworkImageView) v.findViewById(R.id.profile_pic_alternate_cell);
FeedStatusMgsCell = (LoginTextView) v.findViewById(R.id.txtStatusMgs_alternate);
FeedImageViewCell = (FeedImageView) v.findViewById(R.id.feedImage1_alternate);
}
}

public FeedGridAdapter(List<FeedItem> feedItems){mFeedItems = feedItems;}

@Override
public FeedGridAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
RelativeLayout v = (RelativeLayout) LayoutInflater.from(parent.getContext())
.inflate(R.layout.feed_card_alternate, parent, false);
return new ViewHolder(v);
}

@Override
public void onBindViewHolder(final ViewHolder holder, final int position) {
holder.ProfileNameCell.setText(mFeedItems.get(position).getName());
CharSequence timeStampCell = DateUtils.getRelativeTimeSpanString(
Long.parseLong(mFeedItems.get(position).getTimeStamp()),
System.currentTimeMillis(), DateUtils.SECOND_IN_MILLIS);
holder.FeedTimesStampCell.setText(timeStampCell);
if (!TextUtils.isEmpty(mFeedItems.get(position).getStatus())){
holder.FeedStatusMgsCell.setText(mFeedItems.get(position).getStatus());
holder.FeedStatusMgsCell.setVisibility(View.VISIBLE);
} else {
holder.FeedStatusMgsCell.setVisibility(View.GONE);
}

holder.ProfilepicCell.setImageUrl(mFeedItems.get(position).getImge(), imageLoader);

if (mFeedItems.get(position).getImge() != null){
holder.FeedImageViewCell.setImageUrl(mFeedItems.get(position).getImge(), imageLoader);
holder.FeedImageViewCell.setVisibility(View.VISIBLE);
holder.FeedImageViewCell
.setResponseObserver(new FeedImageView.ResponseObserver() {
@Override
public void onError() {

}

@Override
public void onSuccess() {

}
});
} else {
holder.FeedImageViewCell.setVisibility(View.GONE);
}
holder.container.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
if (listener != null)
listener.onItemClicked(holder.getAdapterPosition());
}
});

}

@Override
public int getItemCount() {
return mFeedItems.size();
}

public void setListener(OnItemClickedListener listener){this.listener = listener;}

}


and the expandable fragment is

public class FeedExpandableAdapter extends ExpandablePagerAdapter<FeedItem> {
public FeedExpandableAdapter(List<FeedItem> items){super(items);}
private LayoutInflater inflater;
private Activity activity;
ImageLoader imageLoader = AppController.getInstance().getImageLoader();

@Override
public Object instantiateItem(ViewGroup container, int position) {
final ViewGroup rootView = (ViewGroup) LayoutInflater.from(container.getContext()).inflate(R.layout.feed_page_alternative, container, false);

if (inflater == null)
inflater = (LayoutInflater)activity
.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
if (imageLoader == null)
imageLoader = AppController.getInstance().getImageLoader();

LoginTextView name = (LoginTextView) rootView.findViewById(R.id.profile_name_header);
LoginTextView timestamp = (LoginTextView) rootView.findViewById(R.id.feed_time_stamp_header);
NetworkImageView profilepic = (NetworkImageView) rootView.findViewById(R.id.profile_pic_header_image);

FeedImageView feedImageView = (FeedImageView) rootView.findViewById(R.id.feed_main_image_bottom_sheet);

LoginTextView statusMgs = (LoginTextView) rootView.findViewById(R.id.body_bottom_panel_feed);

name.setText(items.get(position).getName());

CharSequence timeofStamp = DateUtils.getRelativeTimeSpanString(
Long.parseLong(items.get(position).getTimeStamp()),
System.currentTimeMillis(), DateUtils.SECOND_IN_MILLIS);
timestamp.setText(timeofStamp);

if (!TextUtils.isEmpty(items.get(position).getStatus())){
statusMgs.setText(items.get(position).getStatus());
statusMgs.setVisibility(View.VISIBLE);
} else {
statusMgs.setVisibility(View.GONE);
}

profilepic.setImageUrl(items.get(position).getProfilePic(), imageLoader);
if (items.get(position).getImge() != null) {
feedImageView.setImageUrl(items.get(position).getImge(), imageLoader);
feedImageView.setVisibility(View.VISIBLE);
feedImageView
.setResponseObserver(new FeedImageView.ResponseObserver() {
@Override
public void onError() {
}

@Override
public void onSuccess() {
}
});
} else {
feedImageView.setVisibility(View.GONE);
}

return attach(container, rootView, position);
}
}


the error shown is like this -


java.lang.NullPointerException: Attempt to invoke virtual method 'void com.telenav.expandablepager.ExpandablePager.setAdapter(android.support.v4.view.PagerAdapter)' on a null object reference
at com.evolustudios.askin.askin.src.fragments.FeedFragmentAlternative.onCreateView(FeedFragmentAlternative.java:86)


can anyone tell me why its returning null?
its possible duplicate, but i cannot figure out why its returning null

xml - feed_card_alternate

<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="350dp"
android:paddingTop="10dp"
android:paddingBottom="10dp">
<it.gmariotti.cardslib.library.view.CardViewNative
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/feed_card_style"
style="@style/card_external">
<FrameLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/frame_list_card_item_alternate"
android:background="@drawable/cardpanel"
android:paddingTop="0dp">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:id="@+id/feed_top_panel_alternate"
android:paddingBottom="25dp">
<com.android.volley.toolbox.NetworkImageView
android:layout_width="50dp"
android:layout_height="50dp"
android:id="@+id/profile_pic_alternate_cell"
android:scaleType="fitCenter"
android:paddingTop="15dp"/>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:paddingLeft="10dp"
android:paddingTop="15dp">
<com.evolustudios.askin.askin.src.customfonts.LoginTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/client_name_alternate_cell"
android:textSize="15dp"
android:textStyle="bold"/>
<com.evolustudios.askin.askin.src.customfonts.LoginTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/time_stamp_alternate_cell"
android:textColor="@color/timestamp"
android:textSize="13dp"/>
</LinearLayout>

</LinearLayout>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
android:id="@+id/feed_other_content_alternate"
android:layout_below="@+id/feed_top_panel_alternate">
<com.evolustudios.askin.askin.src.customfonts.LoginTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/txtStatusMgs_alternate"
android:paddingBottom="5dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:paddingTop="13dp" />
<com.evolustudios.askin.askin.src.customfonts.LoginTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/txtUrl_alternate"
android:linksClickable="true"
android:paddingBottom="10dp"
android:paddingLeft="15dp"
android:paddingRight="15dp"
android:textColor="@color/link" />
<com.evolustudios.askin.askin.src.Utils.FeedImageView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/feedImage1_alternate"
android:background="#80FFFFFF"
android:scaleType="fitXY"
android:visibility="visible" />
</LinearLayout>
</RelativeLayout>


</FrameLayout>

</it.gmariotti.cardslib.library.view.CardViewNative>




feed_activity_alternate.xml

<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent" android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools">

<jp.co.recruit_lifestyle.android.widget.WaveSwipeRefreshLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/feed_wave_swipe_layout_refresh_alternate">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/feeds_list_recycler_view"
android:layout_marginEnd="8dp"
android:layout_marginLeft="8dp"
android:scrollbars="vertical"
tools:listitem="@layout/feed_item_list_new">
</android.support.v7.widget.RecyclerView>

<com.telenav.expandablepager.ExpandablePager
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/bottom_feed_container"
android:layout_gravity="bottom"
app:animation_duration="200"
app:collapsed_height="@dimen/header_height"/>
</jp.co.recruit_lifestyle.android.widget.WaveSwipeRefreshLayout>




feed_page_alternative

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical" android:layout_width="match_parent"
android:layout_height="match_parent"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:background="@color/pumice">

<include
layout="@layout/feed_header_layout"/>

<LinearLayout
android:layout_width="match_parent"
android:layout_height="250sp"
android:layout_gravity="center_horizontal"
android:orientation="horizontal"
android:paddingTop="10dp"
android:id="@+id/feed_bottom_panel_first_container">

<com.evolustudios.askin.askin.src.Utils.FeedImageView
android:layout_width="270sp"
android:layout_height="match_parent"
android:background="@color/edward"
android:id="@+id/feed_main_image_bottom_sheet"
android:scaleType="fitCenter"/>

<ScrollView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_gravity="center_vertical"
android:scrollbars="none">
<ListView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/feed_extra_iamge_list_view_bootom_panel">
</ListView>
</ScrollView>

</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="60dp"
android:id="@+id/feed_bottom_panel_second_container"
android:baselineAligned="false"
android:orientation="horizontal"
android:weightSum="5">
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_sentiment_very_satisfied_black_24dp"
android:scaleType="fitCenter"
android:padding="5dp"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:padding="5dp"
android:src="@drawable/ic_sentiment_satisfied_black_24dp"
android:scaleType="fitCenter"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_sentiment_neutral_black_24dp"
android:scaleType="fitCenter"
android:padding="5dp"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_sentiment_dissatisfied_black_24dp"
android:scaleType="fitCenter"
android:padding="5dp"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<ImageView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:src="@drawable/ic_sentiment_very_dissatisfied_black_24dp"
android:scaleType="fitCenter"
android:padding="5dp"/>
</RelativeLayout>

</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="30dp"
android:id="@+id/feed_bottom_panel_third_container"
android:baselineAligned="false"
android:orientation="horizontal"
android:weightSum="5">
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/very_liked_number_bottom_panel"
android:text="100"
android:gravity="center"
android:textColor="@color/ming"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/liked_number_bottom_panel"
android:text="100"
android:gravity="center"
android:textColor="@color/ming"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/neutral_number_bottom_panel"
android:text="100"
android:gravity="center"
android:textColor="@color/ming"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/not_liked_number_bottom_panel"
android:text="100"
android:gravity="center"
android:textColor="@color/ming"/>
</RelativeLayout>
<RelativeLayout
android:layout_width="0dp"
android:layout_height="match_parent"
android:layout_weight="1">
<TextView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/very_not_liked_number_bottom_panel"
android:text="100"
android:gravity="center"
android:textColor="@color/ming"/>
</RelativeLayout>

</LinearLayout>

<ScrollView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:scrollbars="none"
android:paddingLeft="22dp"
android:paddingRight="22dp"
android:paddingTop="15dp"
android:paddingBottom="15dp">
<com.evolustudios.askin.askin.src.customfonts.LoginTextView
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@+id/body_bottom_panel_feed"
android:text="Body"
android:textSize="20dp"/>
</ScrollView>



Answer

Change,

pager = (ExpandablePager) getActivity().findViewById(R.id.bottom_feed_container);

to

pager = (ExpandablePager) view.findViewById(R.id.bottom_feed_container);

Also change,

final RecyclerView mRecyclerView = (RecyclerView) getActivity().findViewById(R.id.feeds_list_recycler_view);

to

final RecyclerView mRecyclerView = (RecyclerView) view.findViewById(R.id.feeds_list_recycler_view);
Comments