I have a Fragment "MyParentFragment" (in a tabbed fragment in a NavigationDrawer Activity). In MyParentFragment sits a RecyclerView, fed from a SQLiteDB. When clicked on a RecyclerView item, a custom DialogFragment "myDialogFragment" is opened and a bundle containing a custom Parcelable object is passed. The DialogFragment contains a button, that does stuff (later).
So far, everything is working.
Now, when I click the button in the DialogFragment, after it did its stuff, I want to return to the DialogFragments parent fragment "MyParentFragment" that has the RecyclerView, if possible showing the RecyclerView item, that was last clicked. Everything I tried so far, crashed the app.
The DialogFragment does not have to return anything (currently a String), I can work around that, but it would be great if it could return a custom object of another class.
Min SDK version is 21, current target version is 32.
This is my first Android Project. I know some Java, but Android development, interfaces, backstacks and such are new to me. I hope you can help me.
This is MyParentFragment:
Java:
package com.example.utnmpg;
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.utnmpg.Database.DataBaseHelper;
import com.example.utnmpg.Database.VPeopleModel;
import com.example.utnmpg.RecView.PeopleRecycleViewAdapter;
import java.util.ArrayList;
public class MyParentFragment extends Fragment
implements View.OnClickListener, MyDialogFragment.DialogListener{
private DataBaseHelper dataBaseHelper;
private ArrayList<VPeopleModel> peopleList;
private RecyclerView MyRecyclerView;
private RecyclerView.Adapter mAdapter;
public MyParentFragment() {
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dataBaseHelper = new DataBaseHelper(getContext());
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_myparrent,
container, false);
MyRecyclerView = view.findViewById(R.id.rv_peopleList);
MyRecyclerView.setHasFixedSize(true);
RecyclerView.LayoutManager layoutManager = new LinearLayoutManager(view.getContext());
MyRecyclerView.setLayoutManager(layoutManager);
mAdapter = new PeopleRecycleViewAdapter(peopleList, view.getContext());
MyRecyclerView.setAdapter(mAdapter);
return view;
}
@Override
public void onClick(View v) {
}
@Override
public void onFinishNoDialog(String inputText) {
Toast.makeText(getContext(), inputText, Toast.LENGTH_SHORT).show();
}
}
This is the RecyclerView in MyParentFragment:
Java:
package com.example.utnmpg.RecView;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.appcompat.app.AppCompatActivity;
import androidx.constraintlayout.widget.ConstraintLayout;
import androidx.fragment.app.Fragment;
import androidx.fragment.app.FragmentManager;
import androidx.fragment.app.FragmentTransaction;
import androidx.recyclerview.widget.RecyclerView;
import com.example.utnmpg.Database.VPeopleModel;
import com.example.utnmpg.MyDialogFragment;
import com.example.utnmpg.R;
import java.util.ArrayList;
public class PeopleRecycleViewAdapter
extends RecyclerView.Adapter<PeopleRecycleViewAdapter.MyViewHolder>
implements View.OnClickListener, MyDialogFragment.DialogListener {
private ArrayList<VPeopleModel> peopleList;
private Context context;
public PeopleRecycleViewAdapter(ArrayList<VPeopleModel> peopleListParam,
Context contextP) {
this.peopleList = peopleListParam;
this.context = contextP;
}
@NonNull
@Override
public MyViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.one_person,
parent, false);
return new MyViewHolder(view);
}
@Override
public void onBindViewHolder(@NonNull MyViewHolder holder, int position) {
holder.tvName.setText(peopleList.get(position).toStringName());
holder.parentLayout.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
MyDialogFragment myDialogFragment = new MyDialogFragment();
Bundle bundle = new Bundle();
bundle.putParcelable("people", peopleList.get(holder.getBindingAdapterPosition()));
myDialogFragment.setArguments(bundle);
FragmentManager fragmentManager = ((AppCompatActivity) context).getSupportFragmentManager();
FragmentTransaction fragmentTransaction = fragmentManager.beginTransaction();
Fragment prev = fragmentManager.findFragmentByTag("people");
if (prev != null) {
fragmentTransaction.remove(prev);
}
fragmentTransaction.addToBackStack(null);
myDialogFragment.show(fragmentManager, "people");
}
});
}
@Override
public int getItemCount() {
return peopleList.size();
}
@Override
public void onClick(View v) { }
@Override
public void onFinishNoDialog(String returnText) {
Toast.makeText(context, returnText, Toast.LENGTH_SHORT).show();
}
public class MyViewHolder extends RecyclerView.ViewHolder {
private TextView tvName;
private ConstraintLayout parentLayout;
public MyViewHolder(@NonNull View itemView) {
super(itemView);
tvName = itemView.findViewById(R.id.tv_ndia_name);
//onePersonLayout is the id defined in one_person.xml
parentLayout = itemView.findViewById(R.id.onePersonLayout);
}
}
}
And the DialogFragment:
Java:
package com.example.utnmpg;
import android.app.Dialog;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import androidx.annotation.NonNull;
import androidx.annotation.Nullable;
import androidx.fragment.app.DialogFragment;
import androidx.fragment.app.Fragment;
import com.example.utnmpg.Database.DataBaseHelper;
import com.example.utnmpg.Database.VPeopleModel;
public class MyDialogFragment extends DialogFragment {
private TextView tvName;
private Button btnOK;
private DataBaseHelper dataBaseHelper;
public MyDialogFragment() {
}
public static MyDialogFragment newInstance(VPeopleModel peopleModel) {
MyDialogFragment fragment = new MyDialogFragment();
Bundle args = new Bundle();
return fragment;
}
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
dataBaseHelper = new DataBaseHelper(getContext());
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
return super.onCreateDialog(savedInstanceState);
}
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_my_dialog, container, false);
Bundle bundle = getArguments();
VPeopleModel peopleModel = bundle.getParcelable("people");
tvName = view.findViewById(R.id.tv_ndia_name);
btnOK = view.findViewById(R.id.btn_ndia_ok);
tvName.setText(peopleModel.getName());
btnOK.setOnClickListener(item -> {
Toast.makeText(getContext(), "klicked", Toast.LENGTH_SHORT).show();
String success = "yes";
DialogListener dialogListener = (DialogListener) getParentFragment();
dialogListener.onFinishNoDialog(success);
dismiss();
});
return view;
}
@Override
public void onViewCreated(@NonNull View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
}
@Override
public void onDestroyView() {
super.onDestroyView();
}
@Override
public void onResume() {
super.onResume();
}
public interface DialogListener {
void onFinishNoDialog(String inputText);
}
}
Thank You
