I'm trying to fetch data from an API and show the data into a recycler view. That API Contains an image URL and id. And I want to show the image from the URL and the id in the recycler view. But when I go to the Activity the recycler view is not showing the list. It is fetching the data from the API very well but it is not showing the data in the Recyclerview in a list format.
RecyclerviewAdapter.java
package com.madhulata.shriresume.shared;
import android.content.Context;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.recyclerview.widget.RecyclerView;
import com.bumptech.glide.Glide;
import com.madhulata.shriresume.R;
import java.util.ArrayList;
public class RecyclerviewAdapter extends RecyclerView.Adapter<RecyclerviewAdapter.ViewHolder>{
private ArrayList<String> mImageNames;
private ArrayList<String> mId;
private Context mContext;
public RecyclerviewAdapter(ArrayList<String> mImageNames, ArrayList<String> mId, Context mContext) {
this.mImageNames = mImageNames;
this.mId = mId;
this.mContext = mContext;
}
#NonNull
#Override
public ViewHolder onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.resume_format,parent,false);
ViewHolder holder = new ViewHolder(view);
return holder;
}
#Override
public void onBindViewHolder(#NonNull ViewHolder holder, final int position) {
Log.d("Recycler","on Bind Called");
Glide.with(mContext)
.asBitmap()
.load(mImageNames.get(position))
.into(holder.resumeImage);
holder.resumeId.setText(mId.get(position));
holder.constraintLayout.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View view) {
Toast.makeText(mContext, mImageNames.get(position), Toast.LENGTH_SHORT).show();
}
});
}
#Override
public int getItemCount() {
return mImageNames.size();
}
public class ViewHolder extends RecyclerView.ViewHolder{
ImageView resumeImage;
TextView resumeId;
ConstraintLayout constraintLayout;
public ViewHolder(#NonNull View itemView) {
super(itemView);
resumeImage = itemView.findViewById(R.id.resumeLogo);
resumeId = itemView.findViewById(R.id.resumeId);
constraintLayout = itemView.findViewById(R.id.resumeTypeLayout);
}
}
}
***********************************SelectResume.java********************
package com.madhulata.shriresume.activity_dir;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.ProgressBar;
import android.widget.Toast;
import com.madhulata.shriresume.R;
import com.madhulata.shriresume.models.ResumeType;
import com.madhulata.shriresume.shared.RecyclerviewAdapter;
import com.madhulata.shriresume.shared.RetrofitClient;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class SelectResume extends AppCompatActivity {
RecyclerView selectResumeList;
private static final String TAG = "SignupActivity";
private ArrayList<String> mId;
private ArrayList<String> mUrls;
ProgressBar p;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_resume);
mId = new ArrayList<>();
mUrls = new ArrayList<>();
selectResumeList = findViewById(R.id.selectResumeList);
getResume();
}
private void initRecyclerView(){
Log.i("Value","init Recycler View");
RecyclerviewAdapter adapter = new RecyclerviewAdapter(mUrls,mId,this);
selectResumeList.setAdapter(adapter);
selectResumeList.setLayoutManager(new LinearLayoutManager(this));
}
private void getResume(){
Log.i("Value","Call method");
Call<List<ResumeType>> call = RetrofitClient.getInstance().getApi().getResume();
call.enqueue(new Callback<List<ResumeType>>() {
#Override
public void onResponse(Call<List<ResumeType>> call, Response<List<ResumeType>> response) {
if (!response.isSuccessful()){
Toast.makeText(SelectResume.this, response.code(), Toast.LENGTH_SHORT).show();
}else{
List<ResumeType> resume = response.body();
for (ResumeType r : resume){
mUrls.add(r.getUrl());
mId.add(r.getId());
Log.i("Value", mId.toString());
}
}
Log.i("Value","Call method 3");
}
#Override
public void onFailure(Call<List<ResumeType>> call, Throwable t) {
Toast.makeText(SelectResume.this, "Something went wrong!", Toast.LENGTH_SHORT).show();
}
});
initRecyclerView();
}
}
Why it is not showing?
Your initRecyclerView(); called before you update your data from the services. Retrofit callback works in a separate thread.
Try this instead of your method
private void getResume(){
Log.i("Value","Call method");
Call<List<ResumeType>> call = RetrofitClient.getInstance().getApi().getResume();
call.enqueue(new Callback<List<ResumeType>>() {
#Override
public void onResponse(Call<List<ResumeType>> call, Response<List<ResumeType>> response) {
if (!response.isSuccessful()){
Toast.makeText(SelectResume.this, response.code(), Toast.LENGTH_SHORT).show();
}else{
List<ResumeType> resume = response.body();
for (ResumeType r : resume){
mUrls.add(r.getUrl());
mId.add(r.getId());
Log.i("Value", mId.toString());
}
initRecyclerView();
}
Log.i("Value","Call method 3");
}
#Override
public void onFailure(Call<List<ResumeType>> call, Throwable t) {
Toast.makeText(SelectResume.this, "Something went wrong!", Toast.LENGTH_SHORT).show();
}
});
}
You can set adapter once at start in onCreate() even if your data is empty. You can add data later and call notifyDataSetChanged() on the adapter. The RecyclerView will be updated accordingly. This will save you from the overhead of setting adapter to RecyclerView each time you get some data.
public class SelectResume extends AppCompatActivity {
RecyclerView selectResumeList;
private static final String TAG = "SignupActivity";
private ArrayList<String> mId;
private ArrayList<String> mUrls;
ProgressBar p;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_select_resume);
mId = new ArrayList<>();
mUrls = new ArrayList<>();
selectResumeList = findViewById(R.id.selectResumeList);
initRecyclerView();
getResume();
}
private void initRecyclerView(){
Log.i("Value","init Recycler View");
RecyclerviewAdapter adapter = new RecyclerviewAdapter(mUrls, mId, this);
selectResumeList.setAdapter(adapter);
selectResumeList.setLayoutManager(new LinearLayoutManager(this));
}
private void getResume(){
Log.i("Value","Call method");
Call<List<ResumeType>> call = RetrofitClient.getInstance().getApi().getResume();
call.enqueue(new Callback<List<ResumeType>>() {
#Override
public void onResponse(Call<List<ResumeType>> call, Response<List<ResumeType>> response) {
if (!response.isSuccessful()) {
Toast.makeText(SelectResume.this, response.code(), Toast.LENGTH_SHORT).show();
} else {
List<ResumeType> resume = response.body();
for (ResumeType r : resume){
mUrls.add(r.getUrl());
mId.add(r.getId());
Log.i("Value", mId.toString());
}
adapter.notifyDataSetChanged();
}
Log.i("Value","Call method 3");
}
#Override
public void onFailure(Call<List<ResumeType>> call, Throwable t) {
Toast.makeText(SelectResume.this, "Something went wrong!", Toast.LENGTH_SHORT).show();
}
});
}
}
You receive the objects to show into RecyclerView from async network call. You need to update the adapter on the callback of your network call. Moreover I advice to initialize the adapter with empty list on the activity created, and after when you receive your data update the list with notifyDataSetChanged()
https://developer.android.com/reference/android/support/v7/widget/RecyclerView.Adapter.html#notifyDataSetChanged()
Related
I am using recyclerview in fragment dynamically, now i want to open new activity on click of items with the same object / item.
AllCoursesFeagment.java
package com.example.learningapp.ui.NavigationDrawer.AllCourses;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import androidx.fragment.app.Fragment;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import com.example.learningapp.Adapters.AllCoursesMyAdapter;
import com.example.learningapp.Interface.APIinterface;
import com.example.learningapp.Models.CourseListModel;
import com.example.learningapp.R;
import com.example.learningapp.Responses.CourseListResponse;
import com.example.learningapp.RetrofitAPIs.RetrofitAPI;
import com.example.learningapp.utility.ConstantData;
import java.util.List;
import retrofit2.Call;
import retrofit2.Callback;
import retrofit2.Response;
public class AllCoursesFragment extends Fragment {
private RecyclerView recyclerView;
private List<CourseListModel> courseListModelList;
public AllCoursesFragment() {
// Required empty public constructor
}
// TODO: Rename and change types and number of parameters
public static AllCoursesFragment newInstance() {
return new AllCoursesFragment();
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
mParam1 = getArguments().getString(ARG_PARAM1);
mParam2 = getArguments().getString(ARG_PARAM2);
}
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
View view = inflater.inflate(R.layout.fragment_all_courses,null);
recyclerView = view.findViewById(R.id.allCourseList_RV);
APIinterface apIinterface = RetrofitAPI.getClient().create(APIinterface.class);
Call<CourseListResponse> call = apIinterface.getAllCourses(ConstantData.AppKey);
call.enqueue(new Callback<CourseListResponse>() {
#Override
public void onResponse(Call<CourseListResponse> call, Response<CourseListResponse> response){
if (response.isSuccessful()){
courseListModelList = response.body().getCourseList();
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
recyclerView.setAdapter(new AllCoursesMyAdapter(getActivity(),courseListModelList));
}
}
#Override
public void onFailure(Call<CourseListResponse> call, Throwable t) {
Toast.makeText(getActivity(),"Something went wrong",Toast.LENGTH_LONG).show();
}
});
return view;
}
}
AllCoursesMyAdapter.java
This is my adapter class.
package com.example.learningapp.Adapters;
import android.app.Activity;
import android.content.Context;
import android.content.Intent;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import com.example.learningapp.Activities.CheckoutActivity;
import com.example.learningapp.Models.CourseListModel;
import com.example.learningapp.R;
import java.util.List;
public class AllCoursesMyAdapter extends RecyclerView.Adapter<AllCoursesMyAdapter.RecyclerVH> {
Context context;
List<CourseListModel> courseListModelList;
public AllCoursesMyAdapter(Context context, List<CourseListModel> courseListModelList) {
this.context = context;
this.courseListModelList = courseListModelList;
}
#NonNull
#Override
public RecyclerVH onCreateViewHolder(#NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(context).inflate(R.layout.single_row_design_allcourses,parent,false);
return new RecyclerVH(view);
}
#Override
public void onBindViewHolder(#NonNull RecyclerVH holder, int position) {
final CourseListModel courseListModel = courseListModelList.get(position);
holder.courseTitle.setText(courseListModel.getCourseName());
holder.courseDesc.setText(courseListModel.getCourseDescription());
holder.buyBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
moveToNewActivity();
//Toast.makeText(context,"Item Clicked"+position,Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, CheckoutActivity.class);
intent.putExtra("coursetitle",courseListModel.getCourseName());
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
}
private void moveToNewActivity () {
Activity activity = new Activity();
Intent i = new Intent(activity, CheckoutActivity.class);
context.startActivity(i);
((Activity) context).overridePendingTransition(0, 0);
}
#Override
public int getItemCount() {
return courseListModelList.size();
}
public class RecyclerVH extends RecyclerView.ViewHolder {
TextView courseTitle,courseDesc;
Button buyBtn;
public RecyclerVH(#NonNull View itemView) {
super(itemView);
courseTitle = itemView.findViewById(R.id.course_title);
courseDesc = itemView.findViewById(R.id.course_desc);
buyBtn = itemView.findViewById(R.id.btn_buycourse);
}
}
}
I'm gettng crashed when i clicked item
holder.buyBtn.setOnClickListener(new View.OnClickListener() {
#Override
public void onClick(View v) {
moveToNewActivity();
//Toast.makeText(context,"Item Clicked"+position,Toast.LENGTH_SHORT).show();
Intent intent = new Intent(context, CheckoutActivity.class);
intent.putExtra("coursetitle",courseListModel.getCourseName());
intent.setFlags(Intent.FLAG_ACTIVITY_NEW_TASK);
context.startActivity(intent);
}
});
Here i am using a stored list of objects and now i want to move to the new activity when i clicked on an item with given position, but i am not able to do that.
private void moveToNewActivity () {
Activity activity = new Activity(); //this is wrong, delete this
...
}
you can't and shouldn't create an instance of an activity like this, it's something the OS has to schedule and handle for you.
you already seem to have context defined somewhere, so that means:
private void moveToNewActivity () {
Intent i = new Intent(context, CheckoutActivity.class);
context.startActivity(i);
...
}
so that means:
#Override
public void onClick(View v) {
moveToNewActivity();
}
i am trying to write a code where data from firebase can be populated in recyclerview and also make it clickable so that it can pass the clicked data to a different activity anytime it is clicked
package com.example.helpresponse;
import android.app.ProgressDialog;
import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.View;
import android.widget.AdapterView;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import java.util.ArrayList;
import java.util.List;
public class ShowStudentDetailsActivity extends AppCompatActivity {
DatabaseReference databaseReference;
ProgressDialog progressDialog;
List<StudentDetails> list = new ArrayList<>();
RecyclerView recyclerView;
RecyclerView.Adapter adapter ;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_show_student_details);
recyclerView = findViewById(R.id.recyclerView);
recyclerView.setHasFixedSize(true);
recyclerView.setLayoutManager(new LinearLayoutManager(ShowStudentDetailsActivity.this));
progressDialog = new ProgressDialog(ShowStudentDetailsActivity.this);
progressDialog.setMessage("Loading Data from Firebase Database");
progressDialog.show();
databaseReference = FirebaseDatabase.getInstance().getReference("Police").child("Chats");
databaseReference.addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot snapshot) {
for (DataSnapshot dataSnapshot : snapshot.getChildren()) {
StudentDetails studentDetails = dataSnapshot.getValue(StudentDetails.class);
list.add(studentDetails);
}
adapter = new RecyclerViewAdapter(ShowStudentDetailsActivity.this, list);
recyclerView.setAdapter(adapter);
progressDialog.dismiss();
}
#Override
public void onCancelled(DatabaseError databaseError) {
progressDialog.dismiss();
}
});
}
}
the above code displays the data from firebase being populated in recyclerview. but i want to make it clickable so that it will open a new activity that will pass the specific data that was clicked to the new activity.
package com.example.helpresponse;
import android.support.annotation.NonNull;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import java.util.ArrayList;
import java.util.Locale;
public class TargetDataAdapter extends RecyclerView.Adapter<TargetDataAdapter.TargetViewHolder>{
ArrayList<AndroidTargets> targetsArrayList;
public TargetDataAdapter(ArrayList<AndroidTargets> mTargetData) {
targetsArrayList = mTargetData;
}
#NonNull
#Override
public TargetViewHolder onCreateViewHolder(#NonNull ViewGroup viewGroup, int i) {
View v= LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.target_row,viewGroup,false);
return new TargetViewHolder(v);
}
#Override
public void onBindViewHolder(#NonNull TargetViewHolder viewHolder, int i) {
viewHolder.androidTargetName.setText(targetsArrayList.get(i).FIELD1 );
viewHolder.androidTargetNumber.setText(String.format(Locale.getDefault(), "API Level: %d", targetsArrayList.get(i).FIELD2));
viewHolder.androidTargetShortName.setText(targetsArrayList.get(i).FIELD3);
}
#Override
public int getItemCount() {
if(targetsArrayList == null)
return 0;
return targetsArrayList.size();
}
public static class TargetViewHolder extends RecyclerView.ViewHolder {
protected TextView androidTargetName;
protected TextView androidTargetNumber;
protected TextView androidTargetShortName;
public TargetViewHolder(#NonNull View itemView) {
super(itemView);
androidTargetShortName= itemView.findViewById(R.id.textView2);
androidTargetName= itemView.findViewById(R.id.textView3);
androidTargetNumber= itemView.findViewById(R.id.textView4);
}
}
}
the above code is the recyclerview adapter
First Step : Create Interface with any name .
public interface HandleClick {
void onItemClick(int index);
}
after that : you need declare member variable of this interface in Adapter :
private HandleClick mHandleClick;
public void setmHandleClick(HandleClick handleClick) {
this.mHandleClick = handleClick;
}
after that : you need pass the actual implementation for this interface when declare adapter in main activity :
adapter = new RecyclerViewAdapter(ShowStudentDetailsActivity.this, list);
adapter.setmHandleClcik(new HandleClick() {
#Override
public void onItemClick(int index) {
// Here You can Add Any Java Code
Intent intent = new Intent(getApplicationContext() , TargetActivity.class);
startActivity(intent);
}
});
after that : you need trigger this Code when item click in recyclerView :
add this code in method onBindViewHolder :
myClickableView.setOnClickListener((v) -> {
mHandleClick.onItemClick(i);
});
This Way it's allow for developer use features of Activity it's host The recycler View as :
1- startAactivityForResult
2- if you use pagination in your request you can make new request from activity not adapter .
You can set up a clickable view in onBindViewHolder and pass your data in the intent. Something like this:
Add a context field to your TargetDataAdapter class:
private Context context;
Assign the context in onCreateViewHolder:
context = viewGroup.getContext();
Set up the clickable view and pass it an intent with your data:
#Override
public void onBindViewHolder(#NonNull TargetViewHolder viewHolder, int i) {
viewHolder.androidTargetName.setText(targetsArrayList.get(i).FIELD1 );
viewHolder.androidTargetNumber.setText(String.format(Locale.getDefault(), "API Level: %d", targetsArrayList.get(i).FIELD2));
viewHolder.androidTargetShortName.setText(targetsArrayList.get(i).FIELD3);
View myClickableView = viewHolder.itemView.findViewById(R.id.my_clickable_view);
myClickableView.setOnClickListener((v) -> {
Intent intent = new Intent(context, MyClassIWantToSendDataTo.class);
intent.putExtra("myDataKey", myData);
//more intent.putExtra(s) as needed
context.startActivity(intent);
});
}
I'm trying to get favourite items in favourite list from main list.When i click on favourite icon in mainlist, favouritelist get updating but when i remove any favourite from favouritelist and trying to add more favourites from mainlist i get error index out of bound exception
MainActivity
import android.content.Context;
import android.content.Intent;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.Toast;
import java.util.Arrays;
import java.util.List;
public class MainActivity extends AppCompatActivity implements RecyclerViewClickListener{
RecyclerView simpleListView;
static Context ctx;
String diseaseList[];
SharedPreference sharedPreference;
DiseaseAdapter da;
List<String> newDiseaseList;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
ctx=this;
sharedPreference = new SharedPreference();
diseaseList= new String[]{"Abscess",
"Allergies",
"Amnesia",
"Anemia",
"Andropause",
"Angina",
"Weight Loss"};
Arrays.sort(diseaseList);
newDiseaseList = Arrays.asList(diseaseList);
simpleListView= (RecyclerView)findViewById(R.id.simpleListView);
LinearLayoutManager lm=new LinearLayoutManager(MainActivity.this);
simpleListView.setLayoutManager(lm);
/* DividerItemDecoration di=new DividerItemDecoration(MainActivity.this,lm.getOrientation());
simpleListView.addItemDecoration(di);*/
da=new DiseaseAdapter(newDiseaseList,ctx,this);
simpleListView.setAdapter(da);
simpleListView.setHasFixedSize(true);
}
#Override
public boolean onCreateOptionsMenu(Menu menu) {
getMenuInflater().inflate(R.menu.main, menu);
return true;
}
#Override
public boolean onOptionsItemSelected(MenuItem item) {
switch (item.getItemId()) {
case R.id.menu_favorites:
Intent i=new Intent(this,Favourite.class);
this.startActivity(i);
return true;
}
return super.onOptionsItemSelected(item);
}
#Override
protected void onResume() {
super.onResume();
da.notifyDataSetChanged();
}
#Override
public void recyclerViewListClicked(View view, int position) {
ImageView button = (ImageView) view.findViewById(R.id.imgbtn_favorite);
String tag = button.getTag().toString();
if (tag.equalsIgnoreCase("grey")) {
sharedPreference.addFavorite(ctx, newDiseaseList.get(position));
Toast.makeText(ctx,
"add to favourites",
Toast.LENGTH_SHORT).show();
button.setTag("red");
button.setImageResource(R.drawable.star_colour);
} else {
sharedPreference.removeFavorite(ctx, newDiseaseList.get(position));
button.setTag("grey");
button.setImageResource(R.drawable.ic_action_name);
Toast.makeText(ctx,
"removed from favourites",
Toast.LENGTH_SHORT).show();
}
}
}
Favourite.java
import android.app.Activity;
import android.app.AlertDialog;
import android.content.Context;
import android.content.DialogInterface;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.View;
import android.widget.AdapterView;
import android.widget.ImageView;
import android.widget.ListView;
import android.widget.Toast;
import java.util.Collections;
import java.util.List;
public class Favourite extends AppCompatActivity implements RecyclerViewClickListener {
RecyclerView favoriteList;
SharedPreference sharedPreference;
List<String> favorites;
DiseaseAdapter diseaseAdapter;
static Context ctx;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_favourite);
ctx=this;
sharedPreference = new SharedPreference();
favorites = sharedPreference.getFavorites(ctx);
Collections.sort(favorites);
favoriteList = (RecyclerView)findViewById(R.id.favListView);
LinearLayoutManager lm=new LinearLayoutManager(ctx);
favoriteList.setLayoutManager(lm);
favoriteList.setHasFixedSize(true);
if (favorites == null) {
showAlert(getResources().getString(R.string.no_favorites_items),
getResources().getString(R.string.no_favorites_msg));
} else {
if (favorites.size() == 0) {
showAlert(
getResources().getString(R.string.no_favorites_items),
getResources().getString(R.string.no_favorites_msg));
}
if (favorites != null) {
diseaseAdapter = new DiseaseAdapter(favorites,ctx,this);
favoriteList.setAdapter(diseaseAdapter);
}
}
}
public void showAlert(String title, String message) {
if (ctx != null) {
AlertDialog alertDialog = new AlertDialog.Builder(ctx)
.create();
alertDialog.setTitle(title);
alertDialog.setMessage(message);
alertDialog.setCancelable(false);
// setting OK Button
alertDialog.setButton(AlertDialog.BUTTON_POSITIVE, "OK",
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int which) {
dialog.dismiss();
// activity.finish();
getFragmentManager().popBackStackImmediate();
}
});
alertDialog.show();
}
}
#Override
public void recyclerViewListClicked(View view, int position) {
ImageView button = (ImageView) view
.findViewById(R.id.imgbtn_favorite);
String tag = button.getTag().toString();
if (tag.equalsIgnoreCase("grey")) {
sharedPreference.addFavorite(ctx,
favorites.get(position));
Toast.makeText(
ctx,
ctx.getResources().getString(
R.string.add_favr),
Toast.LENGTH_SHORT).show();
button.setTag("red");
button.setImageResource(R.drawable.star_colour);
} else {
sharedPreference.removeFavorite(ctx,
favorites.get(position));
button.setTag("grey");
button.setImageResource(R.drawable.ic_action_name);
/* diseaseAdapter.remove(favorites
.get(position));*/
diseaseAdapter.remove(position);
Toast.makeText(
ctx,
ctx.getResources().getString(
R.string.remove_favr),
Toast.LENGTH_SHORT).show();
}
}
}
Adapter
import android.content.Context;
import android.content.Intent;
import android.database.Cursor;
import android.os.Build;
import android.support.annotation.RequiresApi;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.TextView;
import android.widget.Toast;
import java.util.ArrayList;
import java.util.List;
/**
* Created by admin on 12/4/2017.
*/
public class DiseaseAdapter extends RecyclerView.Adapter<DiseaseAdapter.DiseaseAdapterViewHolder> {
List <String> data;
Context ctx;
private static RecyclerViewClickListener itemListener;
SharedPreference sharedPreference;
DiseaseAdapter(List <String> data, Context ctx, RecyclerViewClickListener itemListener){
this.data=data;
this.ctx=ctx;
sharedPreference = new SharedPreference();
this.itemListener = itemListener;
notifyDataSetChanged();
}
#Override
public DiseaseAdapterViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater inflater=LayoutInflater.from(parent.getContext());
View view= inflater.inflate(R.layout.activity_listview,parent,false);
return new DiseaseAdapterViewHolder(view);
}
#Override
public void onBindViewHolder(DiseaseAdapterViewHolder holder, int position) {
final String title=data.get(position);
holder.textView1.setText(title);
if (checkFavoriteItem(title)) {
holder.imageButton.setImageResource(R.drawable.star_colour);
holder.imageButton.setTag("red");
} else {
holder.imageButton.setImageResource(R.drawable.ic_action_name);
holder.imageButton.setTag("grey");
}
}
#Override
public int getItemCount() {
return data.size();
}
class DiseaseAdapterViewHolder extends RecyclerView.ViewHolder implements View.OnClickListener{
TextView textView1;
ImageView imageButton;
public DiseaseAdapterViewHolder(View itemView) {
super(itemView);
textView1=(TextView) itemView.findViewById(R.id.textView);
imageButton=(ImageView)itemView.findViewById(R.id.imgbtn_favorite);
imageButton.setOnClickListener(this);
}
#Override
public void onClick(View v) {
notifyDataSetChanged();
itemListener.recyclerViewListClicked(v, this.getLayoutPosition());
}
}
/*Checks whether a particular product exists in SharedPreferences*/
public boolean checkFavoriteItem(String checkProduct) {
boolean check = false;
List<String> favorites = sharedPreference.getFavorites(ctx);
if (favorites != null) {
for (String product : favorites) {
if (product.equals(checkProduct)) {
check = true;
break;
}
}
}
return check;
}
public void add(String product) {
data.add(product);
notifyDataSetChanged();
}
public void remove(int position) {
data.remove(position);
notifyItemRemoved(position);
notifyItemRangeChanged(position, data.size());
notifyDataSetChanged();
}
}
SharedPreference
import android.content.Context;
import android.content.SharedPreferences;
import android.content.SharedPreferences.Editor;
import com.google.gson.Gson;
import java.lang.reflect.Type;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
public class SharedPreference {
public static final String PREFS_NAME = "PRODUCT_APP";
public static final String FAVORITES = "Product_Favorite";
public SharedPreference() {
super();
}
// This four methods are used for maintaining favorites.
public void saveFavorites(Context context, List<String> favorites) {
SharedPreferences settings;
Editor editor;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
editor = settings.edit();
Gson gson = new Gson();
String jsonFavorites = gson.toJson(favorites);
editor.putString(FAVORITES, jsonFavorites);
editor.commit();
}
public void addFavorite(Context context, String product) {
List<String> favorites = getFavorites(context);
if (favorites == null)
favorites = new ArrayList<String>();
favorites.add(product);
saveFavorites(context, favorites);
}
public void removeFavorite(Context context, String product) {
List<String> favorites = getFavorites(context);
if (favorites != null) {
favorites.remove(product);
saveFavorites(context, favorites);
}
}
public ArrayList<String> getFavorites(Context context) {
SharedPreferences settings;
List<String> favorites ;
settings = context.getSharedPreferences(PREFS_NAME,
Context.MODE_PRIVATE);
if (settings.contains(FAVORITES)) {
String jsonFavorites = settings.getString(FAVORITES, null);
Gson gson = new Gson();
String [] favoriteItems = (gson.fromJson(jsonFavorites,String [].class));
favorites = Arrays.asList(favoriteItems);
favorites = new ArrayList<String>(favorites);
} else
return null;
return (ArrayList<String>) favorites;
}
}
This is an error that i'm getting
FATAL EXCEPTION: main
Process: com.example.admin.fav, PID: 10974
java.lang.IndexOutOfBoundsException: Invalid index 3, size is 3
at java.util.ArrayList.throwIndexOutOfBoundsException(ArrayList.java:255)
at java.util.ArrayList.get(ArrayList.java:308)
at com.example.admin.fav.Favourite.recyclerViewListClicked(Favourite.java:145)
at com.example.admin.fav.DiseaseAdapter$DiseaseAdapterViewHolder.onClick(DiseaseAdapter.java:90)
at android.view.View.performClick(View.java:5207)
at android.view.View$PerformClick.run(View.java:21168)
at android.os.Handler.handleCallback(Handler.java:746)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:148)
at android.app.ActivityThread.main(ActivityThread.java:5443)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:728)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:618)
Problem in your listener. You are using same adapter class for both MainActivity recylerview & Favourite activity recylerview. After you go back from favourite activity to Mainactivity still your listener read from Favourite activity. Thats the issue.
Solution
Create Static field to hold listener value here am created in SharedPreference Class:
public class SharedPreference {
public static final String PREFS_NAME = "PRODUCT_APP";
public static final String FAVORITES = "Product_Favorite";
/*Added*/
private static RecyclerViewClickListener listener;
public RecyclerViewClickListener getListener() {
return listener;
}
public void setListener(RecyclerViewClickListener listener) {
SharedPreference.listener = listener;
}
/*Added*/
...
}
Add this code to MainActivity & Favourite Activity 'OnCreate' method
sharedPreference.setListener(this);
public class MainActivity extends AppCompatActivity implements RecyclerViewClickListener{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
sharedPreference.setListener(this);
....
}
public class Favourite extends AppCompatActivity implements RecyclerViewClickListener{
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_favourite);
sharedPreference.setListener(this);
....
}
Change Adapter 'OnClick method' to
#Override
public void onClick(View v) {
notifyDataSetChanged();
itemListener = sharedPreference.getListener();
itemListener.recyclerViewListClicked(v, this.getLayoutPosition());
}
And Finally change in MainActivity 'resume' method
#Override
protected void onResume() {
super.onResume();
sharedPreference.setListener(this);
da.notifyDataSetChanged();
}
Hope it helps.!
In your DiseaseAdapterViewHolder change the onclick methode to,
#Override
public void onClick(View v) {
itemListener.recyclerViewListClicked(v, this.getLayoutPosition());
notifyDataSetChanged();
}
I am new to android. I am trying to download data using the Github api and display in and infinite scrolling RecyclerView, the JSON data is been parsed, but somehow the data is not been attached to the recyclerview.
Here is the code below:
Developer_RV_Adapter.java
package com.davidshare.githubdevelopers;
import android.content.Context;
import android.content.Intent;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.ImageView;
import android.widget.ProgressBar;
import android.widget.TextView;
import com.squareup.picasso.Picasso;
import java.util.List;
/**
* Created by GemShare on 9/6/2017.
*/
public class Developer_RV_Adapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private final int VIEW_TYPE_ITEM = 0;
private final int VIEW_TYPE_LOADING = 1;
private OnLoadMoreListener mOnLoadMoreListener;
private boolean isLoading;
private int visibleThreshold = 10;
private int lastVisibleItem, totalItemCount;
private List<Developer> developerList;
Context context;
RecyclerView recyclerView;
public Developer_RV_Adapter(Context context, List<Developer> developerList, RecyclerView recyclerView) {
this.developerList = developerList;
this.context = context;
this.recyclerView = recyclerView;
final LinearLayoutManager linearLayoutManager = (LinearLayoutManager) recyclerView.getLayoutManager();
recyclerView.addOnScrollListener(new RecyclerView.OnScrollListener() {
#Override
public void onScrolled(RecyclerView recyclerView, int dx, int dy) {
super.onScrolled(recyclerView, dx, dy);
totalItemCount = linearLayoutManager.getItemCount();
lastVisibleItem = linearLayoutManager.findLastVisibleItemPosition();
if(!isLoading && totalItemCount<=(lastVisibleItem+visibleThreshold)){
if(mOnLoadMoreListener!=null){
mOnLoadMoreListener.onLoadMore();
}
isLoading = true;
}
}
});
}
public void setmOnLoadMoreListener(OnLoadMoreListener mOnLoadMoreListener){
this.mOnLoadMoreListener = mOnLoadMoreListener;
}
#Override
public int getItemViewType(int position){
return developerList.get(position) == null? VIEW_TYPE_LOADING : VIEW_TYPE_ITEM;
}
#Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if(viewType == VIEW_TYPE_ITEM){
View developerView = LayoutInflater.from(context).inflate(R.layout.developer_list_item, parent, false);
return new DeveloperViewHolder(developerView);
}else if(viewType== VIEW_TYPE_LOADING){
View loadingView = LayoutInflater.from(context).inflate(R.layout.progress_bar_item, parent, false);
return new ProgressViewHolder(loadingView);
}
return null;
}
#Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
Log.w("binder function", "Just entered the binder");
Developer developer = developerList.get(position);
if(holder instanceof DeveloperViewHolder){
DeveloperViewHolder developerViewHolder = (DeveloperViewHolder) holder;
developerViewHolder.gitNameTv.setText(developer.getGitUsername());
Log.w("binder ", developer.getGitProfileUrl());
developerViewHolder.gitUrlTv.setText(developer.getGitProfileUrl());
developerViewHolder.gitPicUrlTv.setText(developer.getGitProfilePicUrl());
Log.w("profile pic", developer.getGitProfilePicUrl());
Picasso.with(developerViewHolder.gitNameTv.getContext()).load(developer.getGitProfilePicUrl()).transform(new RoundedImage(2)).fit().centerCrop().into(developerViewHolder.profilePicImgV);
}else if (holder instanceof ProgressViewHolder) {
ProgressViewHolder loadingViewHolder = (ProgressViewHolder) holder;
loadingViewHolder.loadingProgress.setIndeterminate(true);
}
}
#Override
public int getItemCount() {
return developerList == null ? 0 : developerList.size();
}
public void setLoaded() {
isLoading = false;
}
public class DeveloperViewHolder extends RecyclerView.ViewHolder{
TextView gitNameTv;
TextView gitUrlTv;
ImageView profilePicImgV;
TextView gitPicUrlTv;
public DeveloperViewHolder(final View itemView) {
super(itemView);
gitNameTv = (TextView) itemView.findViewById(R.id.developerName);
gitUrlTv = (TextView) itemView.findViewById(R.id.developerUrl);
profilePicImgV = (ImageView) itemView.findViewById(R.id.developerPic);
gitPicUrlTv = (TextView) itemView.findViewById(R.id.developerPicUrl);
itemView.setOnClickListener(new View.OnClickListener(){
#Override
public void onClick(View v){
Intent i = new Intent(itemView.getContext(), Profile.class);
i.putExtra("profile_name", gitNameTv.getText().toString());
i.putExtra("profile_url", gitUrlTv.getText().toString());
i.putExtra("profile_pic_url", gitPicUrlTv.getText().toString());
v.getContext().startActivity(i);
}
});
}
}
public static class ProgressViewHolder extends RecyclerView.ViewHolder{
public ProgressBar loadingProgress;
public ProgressViewHolder(View itemView) {
super(itemView);
loadingProgress = (ProgressBar) itemView.findViewById(R.id.loading_progress_bar);
}
}
}
DeveloperList.java
package com.davidshare.githubdevelopers;
import android.app.ProgressDialog;
import android.os.Handler;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.util.Log;
import com.android.volley.Request;
import com.android.volley.RequestQueue;
import com.android.volley.Response;
import com.android.volley.VolleyError;
import com.android.volley.toolbox.StringRequest;
import com.android.volley.toolbox.Volley;
import org.json.JSONArray;
import org.json.JSONException;
import org.json.JSONObject;
import java.util.ArrayList;
import java.util.List;
public class DeveloperList extends AppCompatActivity {
List<Developer> developerList;
Developer_RV_Adapter developer_rv_adapter;
Developer developer;
RecyclerView developerRV;
private static final String GIT_BASE_URL = "https://api.github.com/search/users?q=location:";
private static int page = 1;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_developer_list);
developerRV = (RecyclerView) findViewById(R.id.developer_rv);
developerRV.setLayoutManager(new LinearLayoutManager(this));
developerList = new ArrayList<>();
getDevelopersData(prepareQuery("java", "lagos", page));
developer_rv_adapter = new Developer_RV_Adapter(DeveloperList.this, developerList, developerRV);
developerRV.setAdapter(developer_rv_adapter);
developer_rv_adapter.setmOnLoadMoreListener(new OnLoadMoreListener() {
#Override
public void onLoadMore() {
developerList.add(null);
developer_rv_adapter.notifyItemInserted(developerList.size()-1);
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
developerList.remove(developerList.size()-1);
developer_rv_adapter.notifyItemRemoved(developerList.size());
getDevelopersData(prepareQuery("java", "lagos", page));
developer_rv_adapter.notifyDataSetChanged();
developer_rv_adapter.setLoaded();
}
}, 5000);
}
});
}
the getDevelopersData method uses volley to query the github api and parse the JSON response into a List
public void getDevelopersData(String requestUrl) {
StringRequest jsonSringRequest = new StringRequest(Request.Method.GET, requestUrl, new Response.Listener<String>() {
#Override
public void onResponse(String jsonResponse) {
try {
JSONObject gitJSONOBject = new JSONObject(jsonResponse);
JSONArray gitItemsArray = gitJSONOBject.getJSONArray("items");
for (int i = 0; i < gitItemsArray.length(); i++) {
JSONObject developerObject = gitItemsArray.getJSONObject(i);
developer = new Developer(developerObject.getString("login"),
developerObject.getString("html_url"),
developerObject.getString("avatar_url"));
developerList.add(developer);
Log.w("developer_data ", developer.getGitUsername());
}
Log.w("JSON DATA", "getting the json data");
} catch (JSONException e) {
e.printStackTrace();
}
}
},
new Response.ErrorListener() {
#Override
public void onErrorResponse(VolleyError volleyError) {
Log.e("Volley error", volleyError.getMessage());
}
});
RequestQueue requestQueue = Volley.newRequestQueue(this);
requestQueue.add(jsonSringRequest);
}
//get the location and language and the page of the api data you want to load
private String prepareQuery(String language, String location, int page){
this.page++;
String queryUrl = GIT_BASE_URL+location+"+language:"+language+"&page="+page+"&per_page=50";
Log.w("Query URL = > ", queryUrl);
return queryUrl;
}
}
Can anyone help me with this?
try to notify adapter in getDevelopersData() after data add to array list like add this line developer_rv_adapter.notifyDataSetChanged();
Instead of notifyItemInserted() inserted use
notifyItemRangedChanged(fromIndex,toIndex);
This will notify the adapter that some set of data is changed among the whole data and it tells the adapter that adapter should refresh the data and reload it into the recyclerView starting from fromIndex to toIndex as passed into the method.
If all data are changed then use :
notifyDataSetChanged();
if only one dataItem is changed then use :
notifyItemChanged(dataPosition);
Also I think this statment is causing problem.Try to remove this statment and check again.
new Handler().postDelayed(new Runnable() {
#Override
public void run() {
developerList.remove(developerList.size()-1);
developer_rv_adapter.notifyItemRemoved(developerList.size());
getDevelopersData(prepareQuery("java", "lagos", page));
developer_rv_adapter.notifyDataSetChanged();
developer_rv_adapter.setLoaded();
}
}, 5000);
The problem was resolved by just adding developer_rv_adapter.notifyDataSetChanged(); just below developerList.add(developer); this notifies the adapter that new items have been added to the list.
How do I refresh the data from a local database to RecyclerView when data was successfully submitted? I use the tabs on the application. 2nd-Tab functions to submit the data, and if successful, the data will be stored in localDB.
Data on localDB I will present at the 3rd-Tab.
But what happens, I have to swipe 1st-Tab, then swipe to the 2nd-Tab and then swipe to the new 3rd-Tab data on my localDB successfully displayed.
If the 2nd-Tab me to submit the data, then I swipe to 3rd-Tab, the data will not appear on the list of data.
How do I get the data directly displayed without the need to swipe to the first 1st-Tab and then to the 2nd-Tab and 3rd-Tab ???
MainActivity :
import android.os.Bundle;
import android.support.design.widget.TabLayout;
import android.support.v4.app.Fragment;
import android.support.v4.app.FragmentManager;
import android.support.v4.app.FragmentPagerAdapter;
import android.support.v4.view.ViewPager;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.Toolbar;
import com.bertho.gmyl.fragments.EngagedFragment;
import com.bertho.gmyl.fragments.RequestFragment;
import com.bertho.gmyl.fragments.SigninFragment;
import java.util.ArrayList;
import java.util.List;
public class MainActivity extends AppCompatActivity {
private static final String TAG = MainActivity.class.getSimpleName();
private Toolbar toolbar;
private TabLayout tabLayout;
private ViewPager viewPager;
#Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.engine_main);
toolbar = (Toolbar) findViewById(R.id.toolbar);
setSupportActionBar(toolbar);
//getSupportActionBar().setDisplayHomeAsUpEnabled(true);
viewPager = (ViewPager) findViewById(R.id.viewpager);
setupViewPager(viewPager);
tabLayout = (TabLayout) findViewById(R.id.tabs);
tabLayout.setupWithViewPager(viewPager);
}
private void setupViewPager(ViewPager viewPager) {
ViewPagerAdapter adapter = new ViewPagerAdapter(getSupportFragmentManager());
adapter.addFrag(new SigninFragment(), "SIGN-IN");
adapter.addFrag(new EngagedFragment(), "ENGAGED ID");
adapter.addFrag(new RequestFragment(), "LOCATION");
viewPager.setAdapter(adapter);
}
class ViewPagerAdapter extends FragmentPagerAdapter {
private final List<Fragment> mFragmentList = new ArrayList<>();
private final List<String> mFragmentTitleList = new ArrayList<>();
public ViewPagerAdapter(FragmentManager manager) {
super(manager);
}
#Override
public Fragment getItem(int position) {
return mFragmentList.get(position);
}
#Override
public int getCount() {
return mFragmentList.size();
}
public void addFrag(Fragment fragment, String title) {
mFragmentList.add(fragment);
mFragmentTitleList.add(title);
}
#Override
public CharSequence getPageTitle(int position) {
return mFragmentTitleList.get(position);
}
}
}
EngagedFragment (2nd-Tab) Form to save data
import android.os.Bundle;
import android.support.design.widget.Snackbar;
import android.support.v4.app.Fragment;
import android.support.v7.app.AppCompatActivity;
import android.util.Log;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.RelativeLayout;
import android.widget.TextView;
import com.bertho.gmyl.R;
import com.bertho.gmyl.model.Engaged;
import com.google.firebase.database.DataSnapshot;
import com.google.firebase.database.DatabaseError;
import com.google.firebase.database.DatabaseReference;
import com.google.firebase.database.FirebaseDatabase;
import com.google.firebase.database.ValueEventListener;
import com.bertho.gmyl.realm.RealmHelper;
public class EngagedFragment extends Fragment implements View.OnClickListener {
private static final String TAG = EngagedFragment.class.getSimpleName();
private EditText nama, email, nohp;
private Button btnSaveConnection;
private DatabaseReference mFirebaseDatabase;
private FirebaseDatabase mFirebaseInstance;
private RelativeLayout mRoot;
private View rootView;
private String userId;
private TextView lblNama, lblEmail, lblNohp;
private RelativeLayout relativeLayout;
private RealmHelper realmHelper;
public EngagedFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_engaged, container, false);
realmHelper = new RealmHelper(getActivity());
String appName = getResources().getString(R.string.app_name);
loadLocalDB();
nama = (EditText) rootView.findViewById(R.id.txtName);
email = (EditText) rootView.findViewById(R.id.txtEmail);
nohp = (EditText) rootView.findViewById(R.id.txtNoHp);
lblNama = (TextView) rootView.findViewById(R.id.lblNameval);
lblEmail = (TextView) rootView.findViewById(R.id.lblEmailval);
lblNohp = (TextView) rootView.findViewById(R.id.lblNohpval);
relativeLayout = (RelativeLayout) rootView.findViewById(R.id.panelLabelDetail);
btnSaveConnection = (Button) rootView.findViewById(R.id.btnEngaged);
mFirebaseInstance = FirebaseDatabase.getInstance();
mFirebaseDatabase = mFirebaseInstance.getReference("tbl_engaged");
mFirebaseInstance.getReference("titleapp").setValue(appName);
mFirebaseInstance.getReference("titleapp").addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Log.e(TAG, "TITLE UPDATED FROM FIREBASE");
String appTitle = dataSnapshot.getValue(String.class);
((AppCompatActivity)getActivity()).getSupportActionBar().setTitle(appTitle);
}
#Override
public void onCancelled(DatabaseError error) {
Log.e(TAG, "FAILED TO READ TITLE FROM FIREBASE.", error.toException());
}
});
btnSaveConnection.setOnClickListener(this);
return rootView;
}
private void showSnack(String notify) {
mRoot = (RelativeLayout) rootView.findViewById(R.id.frag_engaged);
Snackbar snackbar = Snackbar.make(mRoot, notify, Snackbar.LENGTH_LONG);
snackbar.show();
}
public void onClick(View v) {
if(v.getId() == R.id.btnEngaged) {
String txtName = nama.getText().toString();
String txtEmail = email.getText().toString();
String txtNo = nohp.getText().toString();
if(txtName.equals("") || txtName.isEmpty()) {
showSnack("Name must filled");
nama.requestFocus();
} else if (txtEmail.equals("") || txtEmail.isEmpty()) {
showSnack("Email must filled");
email.requestFocus();
} else if (txtNo.equals("") || txtNo.isEmpty()) {
showSnack("No.HP must filled");
nohp.requestFocus();
} else {
createUser(txtName, txtEmail, txtNo);
saveToLocalDB(txtName, txtEmail, txtNo);
}
}
}
private void saveToLocalDB(String txtName, String txtEmail, String txtNo) {
realmHelper.addEngaged(txtName, txtEmail, txtNo);
}
private void loadLocalDB() {
realmHelper.getAllData();
}
private void createUser(String name, String email, String nohp) {
userId = mFirebaseDatabase.push().getKey();
Engaged user = new Engaged(name, email, nohp);
mFirebaseDatabase.child(userId).setValue(user);
addUserChangeListener();
}
private void addUserChangeListener() {
mFirebaseDatabase.child(userId).addValueEventListener(new ValueEventListener() {
#Override
public void onDataChange(DataSnapshot dataSnapshot) {
Engaged user = dataSnapshot.getValue(Engaged.class);
if (user == null) {
Log.e(TAG, "ENGAGED DATA IS NULL");
return;
}
Log.e(TAG, "ENGAGED DATA IS CHANGED!" + user.name + ", " + user.email);
lblNama.setText(user.name);
lblEmail.setText(user.email);
lblNohp.setText(user.nohp);
//relativeLayout.setVisibility(View.VISIBLE);
nama.setText("");
email.setText("");
nohp.setText("");
}
#Override
public void onCancelled(DatabaseError error) {
// Failed to read value
Log.e(TAG, "FAILED TO READ USER", error.toException());
}
});
}
}
RequestFragment (3rd-Tab) To display localDB
import android.content.Intent;
import android.os.Bundle;
import android.support.v4.app.Fragment;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Toast;
import com.bertho.gmyl.R;
import com.bertho.gmyl.adapter.AdapterEngaged;
import com.bertho.gmyl.model.ModelEngaged;
import com.bertho.gmyl.realm.RealmHelper;
import java.util.ArrayList;
public class RequestFragment extends Fragment {
private static final String TAG = "RequestFragment";
private RecyclerView recyclerView;
private View rootView;
private ArrayList<ModelEngaged> data;
private RealmHelper helper;
public RequestFragment() {
// Required empty public constructor
}
#Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
#Override
public View onCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) {
rootView = inflater.inflate(R.layout.fragment_request, container, false);
data = new ArrayList<>();
helper = new RealmHelper(getActivity());
recyclerView = (RecyclerView) rootView.findViewById(R.id.rvArticle);
recyclerView.setLayoutManager(new LinearLayoutManager(getContext()));
setRecyclerView();
return rootView;
}
public void setRecyclerView() {
try {
data = helper.findAllArticle();
} catch (Exception e) {
e.printStackTrace();
}
AdapterEngaged adapter = new AdapterEngaged(data, new AdapterEngaged.OnItemClickListener() {
#Override
public void onClick(ModelEngaged item) {
Toast.makeText(getContext(), "LIST CLICKED", Toast.LENGTH_LONG).show();
}
});
recyclerView.setAdapter(adapter);
}
#Override
public void onResume() {
super.onResume();
try {
data = helper.findAllArticle();
} catch (Exception e) {
e.printStackTrace();
}
setRecyclerView();
}
}
Everything went smoothly, it's just that I hope the data can be displayed when the form is submitted and can be directly viewed on the 3rd-Tab
Try this,
Create an Interface in EngagedFragment
say,
public interface SubmitListener {
void onSubmit();
}
private SubmitListener onSubmitListener;
public void setSubmitListener(SubmitListener onSubmitListener){
this.onSubmitListener = onSubmitListener;
}
public SubmitListener getOnSubmitListener(){
return onSubmitListener;
}
In saveToLocalDB(...) method
call
onSubmitListener.onSubmit();
In MainActivity:
1) Update the below statement:
public class MainActivity extends AppCompatActivity implements EngagedFragment.SubmitListener
2) Make your ViewPagerAdapter adapter; variable as Global variable;
while adding fragment:
EngagedFragment engagedFrag = new EngagedFragment();
adapter.addFrag(engagedFrag, "ENGAGED ID");
...
viewPager.setAdapter(adapter);
3) add this after setting adapter
engagedFrag.setSubmitListener(this);
4) Override onSubmit() method and try the below code in that method
if(viewPager != null){
if(adapter != null){
Fragment fragment = adapter.getItem(2);
if(fragment != null){
RequestFragment requestFragment = (RequestFragment) fragment;
requestFragment.setRecyclerView();
}
}
}
try this
mViewPager.setOffscreenPageLimit(0);
if that doesnt help, please check below SO question:
fragment refresh On Swip
and about : mViewPager.setOffscreenPageLimit(0); this might not work as i found in one of #commonware 's answer's, the following :-
"Does ViewPager require a minimum of 1 offscreen pages
Yes. If I am reading the source code correctly, you should be getting a warning about this in LogCat, something like:
Requested offscreen page limit 0 too small; defaulting to 1"