I have tried everything including adding
implementation 'com.android.support:recyclerview-v7:27.0.0'
These are my related java classes
Home.java
package com.example.re_search;
import android.os.Bundle;
import android.support.annotation.Nullable;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.KeyEvent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import com.example.re_search.model.PostModel;
import java.util.ArrayList;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
import retrofit2.Retrofit;
import retrofit2.converter.gson.GsonConverterFactory;
public class Home extends Fragment{
private ArrayList<Integer> pkPost = new ArrayList<>();
private ArrayList<String> namePost = new ArrayList<>();
private RecyclerView recyclerView;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
View rootView = inflater.inflate(R.layout.post_list, container, false);
recyclerView = rootView.findViewById(R.id.recycler_category_list);
if ( InternetUtil.isInternetOnline(getActivity()) ){
ClearList();
showAllPosts();
}
getActivity().setTitle("Clusters");
return rootView;
}
private void showAllPosts() {
Log.i("All posts showed", "All posts showed");
Retrofit retrofit = new Retrofit.Builder()
.baseUrl(PostApi.API_URL)
.addConverterFactory(GsonConverterFactory.create())
.build();
Log.i("Retrofit build", "Retrofit build");
PostApi postApi= retrofit.create(PostApi.class);
Log.i("Postapi createdd", "Postapi createdd");
Call<List<PostModel>> call = postApi.getListPost();
Log.i("Call list called", "Call list called");
call.enqueue(new Callback<List<PostModel>>() {
@Override
public void onResponse(Call<List<PostModel>> call, Response<List<PostModel>> response) {
Log.i("Response Received", "Response Received");
if(response.isSuccessful()){
Log.i("Response Received", "Response Received");
if (response.body() != null) {
List<PostModel> postList = response.body();
for(PostModel h:postList){
//Integer cat_id = h.getId();
//pkPost.add(cat_id);
String cat_name = h.getTitle();
namePost.add(cat_name);
}
initRecyclerView();
}
}else {
Log.d("fail", "fail");
}
}
@Override
public void onFailure(Call<List<PostModel>> call, Throwable t) {
Log.d("fail", t.getMessage() == null ? "" : t.getMessage());
}
});
}
private void initRecyclerView(){
Log.d("Home", "initRecyclerView: init recyclerview.");
RecyclerHomeList adapter = new RecyclerHomeList(getActivity(), pkPost, namePost);
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
}
public void ClearList()
{
pkPost.clear();
namePost.clear();
RecyclerHomeList adapter = new RecyclerHomeList(getActivity(), pkPost, namePost);
adapter.notifyDataSetChanged();
recyclerView.setAdapter(adapter);
}
@Override
public void onResume() {
super.onResume();
getView().setFocusableInTouchMode(true);
getView().requestFocus();
getView().setOnKeyListener(new View.OnKeyListener() {
@Override
public boolean onKey(View v, int keyCode, KeyEvent event) {
if (event.getAction() == KeyEvent.ACTION_UP && keyCode == KeyEvent.KEYCODE_BACK){
getActivity().finish();
return true;
}
return false;
}
});
}
}
RecyclerHomeList.java
package com.example.re_search;
import android.content.Context;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.RelativeLayout;
import android.widget.TextView;
import java.util.ArrayList;
public class RecyclerHomeList extends RecyclerView.Adapter<RecyclerHomeList.ViewHolder>{
private static final String TAG = "RecyclerProfileListAdapter";
private ArrayList<Integer> pkPost = new ArrayList<>();
private ArrayList<String> namePost = new ArrayList<>();
private Context mContext;
public RecyclerHomeList(Context context, ArrayList<Integer> rId, ArrayList<String> rName) {
pkPost = rId;
namePost = rName;
mContext = context;
}
@Override
public RecyclerHomeList.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.post_list_item, parent, false);
RecyclerHomeList.ViewHolder holder = new RecyclerHomeList.ViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(RecyclerHomeList.ViewHolder holder, final int position) {
holder.TId.setText(String.valueOf(pkPost.get(position)));
holder.TName.setText(namePost.get(position));
holder.parentLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
// Bundle bundle = new Bundle();
// bundle.putInt("post_id",pkPost.get(position)); // Put anything what you want
// AppCompatActivity activity = (AppCompatActivity) view.getContext();
// Fragment myFragment = new ShowPost();
// myFragment.setArguments(bundle);
// activity.getSupportFragmentManager()
// .beginTransaction()
// .replace(R.id.fragment_container, myFragment)
// .addToBackStack(null)
// .commit();
}
});
}
@Override
public int getItemCount() {
return pkPost.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
TextView TId;
TextView TName;
RelativeLayout parentLayout;
public ViewHolder(View itemView) {
super(itemView);
TId = itemView.findViewById(R.id.post_listitem_id);
TName = itemView.findViewById(R.id.post_listitem_name);
parentLayout = itemView.findViewById(R.id.parent_layout);
}
}
}
Related XML Files:
post_list.xml
<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
>
<RelativeLayout
android:id="@ id/footer"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_gravity="center"
android:gravity="center">
<fragment
android:id="@ id/button_fragment1"
android:name="com.example.re_search.Footer"
android:layout_width="match_parent"
android:layout_height="wrap_content" />
</RelativeLayout>
<LinearLayout
android:id="@ id/scroll_view"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_above="@ id/footer"
android:fillViewport="true">
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:background="#F3F3F3"
android:orientation="vertical">
<android.support.v7.widget.RecyclerView
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@ id/recycler_category_list">
</android.support.v7.widget.RecyclerView>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
</android.support.constraint.ConstraintLayout>
post_list_item.xml
<?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"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:id="@ id/parent_layout">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_marginLeft="16dp"
android:layout_marginTop="8dp"
android:layout_marginRight="16dp"
android:orientation="vertical"
android:background="#ffffff">
<LinearLayout
android:layout_height="match_parent"
android:orientation="vertical"
android:layout_width="match_parent"
android:layout_marginRight="16dp"
android:layout_marginLeft="16dp"
android:layout_marginTop="9dp"
android:layout_marginBottom="10dp"
>
<TextView
android:id="@ id/post_listitem_id"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
/>
<TextView
android:id="@ id/post_listitem_name"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:text=""
/>
</LinearLayout>
</LinearLayout>
</RelativeLayout>
This is the error trace
I/TetheringManager: registerTetheringEventCallback:com.example.re_search
W/ample.re_searc: Accessing hidden method Ldalvik/system/CloseGuard;->get()Ldalvik/system/CloseGuard; (greylist,core-platform-api, reflection, allowed)
Accessing hidden method Ldalvik/system/CloseGuard;->open(Ljava/lang/String;)V (greylist,core-platform-api, reflection, allowed)
Accessing hidden method Ldalvik/system/CloseGuard;->warnIfOpen()V (greylist,core-platform-api, reflection, allowed)
I/Response Received: Response Received
I/Token: 84639f11977c3078fa92d4f7abc0cb316ef91847
D/CompatibilityChangeReporter: Compat change id reported: 147798919; UID 10121; state: DISABLED
I/All posts showed: All posts showed
I/Retrofit build: Retrofit build
I/Postapi createdd: Postapi createdd
I/Call list called: Call list called
E/RecyclerView: No layout manager attached; skipping layout
I/Response Received: Response Received
Response Received
D/Home: initRecyclerView: init recyclerview.
I am trying to send a get response to the django server but this error is killing my app after the login. please help please.
This is my grade file
plugins {
id 'com.android.application'
}
android {
compileSdkVersion 27
defaultConfig {
applicationId "com.example.re_search"
minSdkVersion 14
targetSdkVersion 27
versionCode 1
versionName "1.0"
testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
vectorDrawables.useSupportLibrary = true
}
buildTypes {
release {
minifyEnabled false
proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
}
}
}
dependencies {
implementation fileTree(dir: 'libs', include: ['*.jar'])
//noinspection GradleCompatible
implementation 'com.android.support:appcompat-v7:27.1.1'
implementation 'com.android.support.constraint:constraint-layout:1.1.0'
testImplementation 'junit:junit:4.12'
androidTestImplementation 'com.android.support.test:runner:1.0.2'
androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
implementation 'com.squareup.retrofit2:retrofit:2.3.0'
implementation 'com.squareup.retrofit2:converter-gson:2.3.0'
implementation 'com.android.support:recyclerview-v7:27.0.0'
//implementation 'com.android.support.constraint:constraint-layout:1.0.2'
}
CodePudding user response：
You need to set your adapter after you have set your LayoutManager.
Change from this:
recyclerView.setAdapter(adapter);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));to this:
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(adapter);CodePudding user response：
The call to initRecyclerView() is done on a background thread, that's the issue. Make the call inside of Oncreate and update values using adapter.datasetchanged()-methods.
CodePudding user response：
You're getting this error because you're initializing your RecyclerView from an asynchronous callback.
You should initialize your RecyclerView inside onCreateView():
// Set up your RecyclerView with the appropriate Layout Manager
RecyclerView myRecycler = findViewById(R.id.my_recycler_id);
myRecycler.setLayoutManager(new LinearLayoutManager(this));
// Create your data set
myData = new ArrayList<MyDataType>();
// Create an instance of your adapter passing the data set into the constructor
myAdapter = new MyAdapter(this, myData);
// Set the Adapter on the RecyclerView directly within onCreate
// so that it doesn't get skipped
myRecycler.setAdapter(myAdapter);
Inside of your Adapter class, create a function to update your data set:
public void updateData(ArrayList<MyDataType> newDataSet){
myAdapterDataSet = newDataSet;
// Let the Adapter know the data has changed and the view should be refreshed
notifyDataSetChanged();
}
Inside of your asynchronous callback, update your adapter:
@Override
public void onDataChange(DataSnapshot snapshot){
// Add the new data to your data set ex. myData.add(newData)
// ...
// After adding to the data set,
// update the data using a custom function you define in your Adapter's class
myAdapter.updateData(myData);
}