I am creating a time table app. The app has a RecyclerView and each row of it has a CardView, called row. Each row has 1 TextView and 2 EditText. I want to get the values from the EditTexts and update it in an ArrayList of row, called rows that is in TimeTable class.
I want to update values in the array list entered in the EditTexts by using addTextChangedListener. But, I am confused in which class I should implement the method. I have to choose between TimeTable class and the TimeTableAdapter class. In case of TimeTable class, I was thinking of putting this method in else condition in my addBtn.setOnClickListener(). In case of TimeTableAdapter I was thinking of adding it in the onBindViewHolder method. I am confused where to put it.
Here is the TimeTable class -
package com.example.timetable;
import android.os.Bundle;
import android.util.Log;
import android.view.View;
import android.widget.Button;
import android.widget.TextView;
import android.widget.Toast;
import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class TimeTable extends AppCompatActivity {
private RecyclerView recyclerView;
private RecyclerView.Adapter mAdapter;
private RecyclerView.LayoutManager layoutManager;
Button addBtn;
TextView day;
TextView date;
ArrayList<row> rows = new ArrayList<>();
private int indexOfEachRow;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.time_table);
setupAppElements();
createRecyclerView();
rows.add(new row());
indexOfEachRow = rows.get(rows.size() - 1).getIndex();
//for testing purpose only, will be deleted in the future
rows.get(rows.size() - 1).setTasksName("sdf");
rows.get(rows.size() - 1).setHours(120);
addBtn.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
//check whether the last row is empty or not
if(rows.get(rows.size()-1).getTasksName().matches("") || rows.get(rows.size()-1).getHours() == 0) {
Toast.makeText(TimeTable.this, "Fill out previous row's content", Toast.LENGTH_SHORT).show();
}
else {
addEmptyRow();
mAdapter.notifyItemInserted(rows.size());
}
}
});
}
public void createRecyclerView(){
recyclerView = (RecyclerView) findViewById(R.id.list);
recyclerView.setHasFixedSize(true);
layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
mAdapter = new TimeTableAdapter(rows, TimeTable.this);
recyclerView.setAdapter(mAdapter);
}
public void addEmptyRow(){
rows.add(new row());
rows.get(rows.size() - 1).setIndex(indexOfEachRow + 1);
rows.get(rows.size() - 1).setTasksName("");
}
public void setupAppElements(){
addBtn = findViewById(R.id.add);
day = findViewById(R.id.day);
date = findViewById(R.id.date);
}
}
Here is TimeTableAdapter -
package com.example.timetable;
import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.EditText;
import android.widget.TextView;
import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;
import java.util.ArrayList;
public class TimeTableAdapter extends RecyclerView.Adapter<TimeTableAdapter.rowVH> {
ArrayList<row> rows;
Context context;
public TimeTableAdapter(ArrayList<row> oneCell, Context context){
rows = oneCell;
this.context = context;
}
public class rowVH extends RecyclerView.ViewHolder{
public TextView index;
public EditText tasksName;
public EditText totalHours;
public rowVH(@NonNull View itemView) {
super(itemView);
index = itemView.findViewById(R.id.index);
tasksName = itemView.findViewById(R.id.taskName);
tasksName.setText("");
totalHours = itemView.findViewById(R.id.totalHours);
totalHours.setText("");
}
}
@NonNull
/**
* RecyclerView calls this method whenever it needs to create a new ViewHolder.
* The method creates and initializes the ViewHolder and its associated View, but
* does not fill in the view's contents—the ViewHolder has not yet been bound to
* specific data.
*/
@Override
public rowVH onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.each_row, parent, false);
rowVH rVH = new rowVH(v);
return rVH;
}
/**
* RecyclerView calls this method to associate a ViewHolder with data. The method fetches
* the appropriate data and uses the data to fill in the view holder's layout. For example,
* if the RecyclerView displays a list of names, the method might find the appropriate name
* in the list and fill in the view holder's TextView widget.
*/
@Override
public void onBindViewHolder(@NonNull rowVH holder, int position) {
holder.index.setText(String.valueOf(rows.get(position).getIndex()));
holder.tasksName.setText(String.valueOf(rows.get(position).getTasksName()));
holder.totalHours.setText(String.valueOf(rows.get(position).getHours()));
}
/**
* RecyclerView calls this method to get the size of the data set. For example, in an address book
* app, this might be the total number of addresses. RecyclerView uses this to determine when there
* are no more items that can be displayed.
*/
@Override
public int getItemCount() {
return rows.size();
}
}
