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I don't know what the problem is can some one help me it's a problem with my recycler view I am getting valus from a retrofit web service then applying it to the adapter
this is my main code
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_chat);
imgAttachment=(ImageView)findViewById(R.id.img_attachment);
imgSend=(ImageView)findViewById(R.id.img_send);
etMessage=(EditText)findViewById(R.id.et_message);
//get user data
UserPhone userPhone=new UserPhone();
userPhone.phone=getIntent().getExtras().getString("receiverNumber");
WebService.getInstance().getApi().getUserData(userPhone).enqueue(new Callback<UserDataResponse>() {
@Override
public void onResponse(Call<UserDataResponse> call, Response<UserDataResponse> response) {
receiverId=response.body().getUserId();
AllMessages allMessages=new AllMessages();
allMessages.receiverID=receiverId;
allMessages.senderID=MainActivity.userId;
WebService.getInstance().getApi().getMessages(allMessages).enqueue(new Callback<List<Message>>() {
@Override
public void onResponse(Call<List<Message>> call, Response<List<Message>> response) {
messages=response.body();
recyclerChat=(RecyclerView)findViewById(R.id.recycler_chat);
LinearLayoutManager layoutManager = new LinearLayoutManager(ChatActivity.this);
recyclerChat.setLayoutManager(layoutManager);
adapter=new MessagingAdapter(messages,ChatActivity.this);
recyclerChat.setAdapter(adapter);
recyclerChat.scrollToPosition(messages.size()-1);
}
@Override
public void onFailure(Call<List<Message>> call, Throwable t) {
}
});
}
@Override
public void onFailure(Call<UserDataResponse> call, Throwable t) {
}
});
//end of get user data
}
this is my logcat
06-20 11:01:09.680 27852-27852/net.paymac.chatty D/ViewRootImpl: ViewPostImeInputStage processPointer 0
06-20 11:01:09.700 27852-27852/net.paymac.chatty D/ViewRootImpl: ViewPostImeInputStage processPointer 1
06-20 11:01:09.710 27852-27852/net.paymac.chatty I/Timeline: Timeline: Activity_launch_request id:net.paymac.chatty time:91556150
06-20 11:01:09.730 27852-27893/net.paymac.chatty D/FA: Logging event (FE): _e, Bundle[{_o=auto, _et=9473, _sc=MainActivity, _si=4899456373428156394}]
06-20 11:01:09.890 27852-27852/net.paymac.chatty D/SecWifiDisplayUtil: Metadata value : none
06-20 11:01:09.890 27852-27852/net.paymac.chatty D/ViewRootImpl: #1 mView = com.android.internal.policy.PhoneWindow$DecorView{b89463c I.E...... R.....ID 0,0-0,0}
06-20 11:01:09.960 27852-27852/net.paymac.chatty E/RecyclerView: No adapter attached; skipping layout
06-20 11:01:09.960 27852-27893/net.paymac.chatty D/FA: Connected to remote service
06-20 11:01:09.960 27852-27852/net.paymac.chatty D/ViewRootImpl: MSG_RESIZED_REPORT: ci=Rect(0, 96 - 0, 0) vi=Rect(0, 96 - 0, 0) or=1
06-20 11:01:09.980 27852-27852/net.paymac.chatty E/RecyclerView: No adapter attached; skipping layout
06-20 11:01:09.980 27852-27852/net.paymac.chatty W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
06-20 11:01:09.980 27852-27852/net.paymac.chatty W/DisplayListCanvas: DisplayListCanvas is started on unbinded RenderNode (without mOwningView)
06-20 11:01:10.240 27852-27852/net.paymac.chatty I/Timeline: Timeline: Activity_idle id: android.os.BinderProxy@675702f time:91556688
06-20 11:01:10.930 27852-27852/net.paymac.chatty D/AndroidRuntime: Shutting down VM
06-20 11:01:10.930 27852-27852/net.paymac.chatty E/AndroidRuntime: FATAL EXCEPTION: main
Process: net.paymac.chatty, PID: 27852
java.lang.NullPointerException: Attempt to write to field 'int android.support.v7.widget.RecyclerView$ViewHolder.mItemViewType' on a null object reference
at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6368)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5555)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5440)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5436)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2224)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1551)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1511)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:595)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3583)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3025)
at android.view.View.measure(View.java:20151)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:716)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:462)
at android.view.View.measure(View.java:20151)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
at android.view.View.measure(View.java:20151)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
at android.support.v7.widget.ActionBarOverlayLayout.onMeasure(ActionBarOverlayLayout.java:393)
at android.view.View.measure(View.java:20151)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:20151)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:747)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:629)
at android.view.View.measure(View.java:20151)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6328)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:3158)
at android.view.View.measure(View.java:20151)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2594)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1549)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1841)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1437)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:7397)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:920)
at android.view.Choreographer.doCallbacks(Choreographer.java:695)
at android.view.Choreographer.doFrame(Choreographer.java:631)
at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:906)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:158)
at android.app.ActivityThread.main(ActivityThread.java:7225)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:1230)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:1120)
my adapter
public class MessagingAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private List<Message> messages;
private Context context;
/**
* Constructor for Adapter
*
* @param messages list of messages will showed
* @param context context
*/
public MessagingAdapter(List<Message> messages, Context context) {
this.messages = messages;
this.context = context;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
/**
* check the type of view and return holder
*/
if (viewType == MessageType.SENT_TEXT) {
return new SentTextHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.message_sent, parent, false));
} else if (viewType == MessageType.SENT_IMAGE) {
return new SentImageHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.message_sent_img, parent, false));
} else if (viewType == MessageType.RECEIVED_TEXT) {
return new ReceivedTextHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.message_recieved, parent, false));
} else if (viewType == MessageType.RECEIVED_IMAGE) {
return new ReceivedImageHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.message_received_img, parent, false));
}
return null;
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder mHolder, int position) {
int type = getItemViewType(position);
Message message = messages.get(position);
/**
* check message type and init holder to user it and set data in the right place for every view
*/
if (type == MessageType.SENT_TEXT) {
SentTextHolder holder = (SentTextHolder) mHolder;
holder.tvTime.setText(message.getTime());
holder.tvMessageContent.setText(message.getContent());
} else if (type == MessageType.SENT_IMAGE) {
//SentImageHolder holder = (SentImageHolder) mHolder;
//holder.tvTime.setText(message.getTime());
//Glide.with(context).load(Urls.IMAGES_URL + message.getContent()).into(holder.imgMsg);
} else if (type == MessageType.RECEIVED_TEXT) {
ReceivedTextHolder holder = (ReceivedTextHolder) mHolder;
holder.tvTime.setText(message.getTime());
holder.tvMessageContent.setText(message.getContent());
} else if (type == MessageType.RECEIVED_IMAGE) {
//ReceivedImageHolder holder = (ReceivedImageHolder) mHolder;
//holder.tvTime.setText(message.getTime());
//holder.tvUsername.setText(message.getUsername());
//Glide.with(context).load(Urls.IMAGES_URL + message.getContent()).into(holder.imgMsg);
}
}
@Override
public int getItemCount() {
return messages.size();
}
@Override
public int getItemViewType(int position) {
/**
* check the user id to detect if message sent or received
* then check if message is text or img
*/
String userID = MainActivity.userId;
Message message = messages.get(position);
if (userID == message.getUserId()) {
if (message.getType().equals("1")) {
return MessageType.SENT_TEXT;
} else if (message.getType().equals("2")) {
return MessageType.SENT_IMAGE;
}
} else {
if (message.getType().equals("1")) {
return MessageType.RECEIVED_TEXT;
} else if (message.getType().equals("2")) {
return MessageType.RECEIVED_IMAGE;
}
}
return super.getItemViewType(position);
}
// sent message holders
class SentMessageHolder extends RecyclerView.ViewHolder {
@BindView(R.id.tv_time)
TextView tvTime;
public SentMessageHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
// sent message with type text
class SentTextHolder extends SentMessageHolder {
@BindView(R.id.tv_message_content)
TextView tvMessageContent;
public SentTextHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
// sent message with type image
class SentImageHolder extends SentMessageHolder {
@BindView(R.id.img_msg)
ImageView imgMsg;
public SentImageHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
// received message holders
class ReceivedMessageHolder extends RecyclerView.ViewHolder {
@BindView(R.id.tv_username)
TextView tvUsername;
@BindView(R.id.tv_time)
TextView tvTime;
public ReceivedMessageHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
// received message with type text
class ReceivedTextHolder extends ReceivedMessageHolder {
@BindView(R.id.tv_message_content)
TextView tvMessageContent;
public ReceivedTextHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
// received message with type image
class ReceivedImageHolder extends ReceivedMessageHolder {
@BindView(R.id.img_msg)
ImageView imgMsg;
public ReceivedImageHolder(View itemView) {
super(itemView);
ButterKnife.bind(this, itemView);
}
}
}
950
Your probably returning a null on onCreateViewHolder on your adapter class
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
/**
* check the type of view and return holder
*/
if (viewType == MessageType.SENT_TEXT) {
return new SentTextHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.message_sent, parent, false));
} else if (viewType == MessageType.SENT_IMAGE) {
return new SentImageHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.message_sent_img, parent, false));
} else if (viewType == MessageType.RECEIVED_TEXT) {
return new ReceivedTextHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.message_recieved, parent, false));
} else if (viewType == MessageType.RECEIVED_IMAGE) {
return new ReceivedImageHolder(LayoutInflater.from(parent.getContext()).inflate(R.layout.message_received_img, parent, false));
}
return null; // This shouldn't return null in any case or error
// will be thrown.
}
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