12. Android Recycler View: How to Insert, Update and Delete Item?

bywww.gvsinstitution.blogspot.com -
0

 

1. Manifest 

<?xml version="1.0" encoding="utf-8"?>
<manifest xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools">

    <application
        android:allowBackup="true"
        android:dataExtractionRules="@xml/data_extraction_rules"
        android:fullBackupContent="@xml/backup_rules"
        android:icon="@drawable/contactsvg"
        android:label="@string/app_name"
        android:supportsRtl="true"
        android:theme="@style/Theme.RecyclerviewExample"
        tools:targetApi="31">
        <activity
            android:name=".MainActivity"
            android:exported="true">
            <intent-filter>
                <action android:name="android.intent.action.MAIN" />

                <category android:name="android.intent.category.LAUNCHER" />
            </intent-filter>
        </activity>
    </application>

</manifest>

2. Java 

1. MainActivity.java:  

package com.example.recyclerviewexample;

import androidx.appcompat.app.AppCompatActivity;
import androidx.recyclerview.widget.LinearLayoutManager;
import androidx.recyclerview.widget.RecyclerView;

import android.app.Dialog;
import android.os.Bundle;
import android.view.View;
import android.widget.Button;
import android.widget.EditText;
import android.widget.Toast;

import com.google.android.material.floatingactionbutton.FloatingActionButton;

import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {
RecyclerView recyclertxt;
RecyclerContactAdapter adapter;
FloatingActionButton btnOpenDialog;
ArrayList<ContactModel> arrContact = new ArrayList<>();
    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);
        recyclertxt = findViewById(R.id.recyclertxt);
        btnOpenDialog = findViewById(R.id.btnOpenDialog);

        btnOpenDialog.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Dialog dialog = new Dialog(MainActivity.this);
                dialog.setContentView(R.layout.add_update_layout);
                EditText edtName = dialog.findViewById(R.id.edtName);
                EditText edtNumber = dialog.findViewById(R.id.edtNumber);
                Button btnAction = dialog.findViewById(R.id.btnAction);

                btnAction.setOnClickListener(new View.OnClickListener() {
                    @Override
                    public void onClick(View v) {
                        String name = "", number = "";
                        if(!edtName.getText().toString().equals("")) {
                         name = edtName.getText().toString();
                        } else {
                            Toast.makeText(MainActivity.this, "Please Enter Contact Name!", Toast.LENGTH_SHORT).show();
                        }
                        if (!edtNumber.getText().toString().equals("")){
                        number = edtNumber.getText().toString();
                        }else {
                            Toast.makeText(MainActivity.this, "Enter a valid number!", Toast.LENGTH_SHORT).show();
                        }
                        arrContact.add(new ContactModel(R.drawable.d, name, number));
                        adapter.notifyItemInserted(arrContact.size()-1);
                        recyclertxt.scrollToPosition(arrContact.size()-1);
                        dialog.dismiss();

                    }
                });
                dialog.show();
            }
        });


        //Yeh hum tb use krty hain jb hum aik value ko bar bar istimal krna ho
        // ContactModel model = new ContactModel(R.drawable.a, "Ali", "03041139358");
        arrContact.add(new ContactModel(R.drawable.a, "Ali", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.b, "Aslam", "030411334454"));
        arrContact.add(new ContactModel(R.drawable.c, "Haider", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.d, "Noman", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.a, "Ali", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.b, "Aslam", "030411334454"));
        arrContact.add(new ContactModel(R.drawable.c, "Haider", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.d, "Noman", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.a, "Ali", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.b, "Aslam", "030411334454"));
        arrContact.add(new ContactModel(R.drawable.c, "Haider", "03041139358"));
        arrContact.add(new ContactModel(R.drawable.d, "Noman", "03041139358"));

        recyclertxt.setLayoutManager(new LinearLayoutManager(this) );
        adapter = new RecyclerContactAdapter(this, arrContact);
        recyclertxt.setAdapter(adapter);
    }
}

2. RecyclerContactAdapter.java: 

package com.example.recyclerviewexample;

import android.app.AlertDialog;
import android.app.Dialog;
import android.content.Context;
import android.content.DialogInterface;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.LinearLayout;
import android.widget.TextView;
import android.widget.Toast;

import androidx.annotation.NonNull;
import androidx.recyclerview.widget.RecyclerView;

import java.util.ArrayList;

public class RecyclerContactAdapter extends RecyclerView.Adapter<RecyclerContactAdapter.ViewHolder> {

    ArrayList<ContactModel> arrContacts;
    Context context;
    RecyclerContactAdapter(Context context, ArrayList<ContactModel> arrContacts){
        this.context = context;
        this.arrContacts = arrContacts;
    }

    @NonNull
    @Override
    public ViewHolder onCreateViewHolder(@NonNull ViewGroup parent, int viewType) {
        View view = LayoutInflater.from(context).inflate(R.layout.contact_row, parent, false);
        ViewHolder viewHolder = new ViewHolder(view);
        return viewHolder;
    }

    @Override
    public void onBindViewHolder(ViewHolder holder, int position){

    ContactModel model1 = (ContactModel) arrContacts.get(position);

    holder.imgContact.setImageResource(model1.img);
    holder.txtName.setText(model1.name);
    holder.txtNumber.setText(model1.number);

    holder.llRow.setOnClickListener(new View.OnClickListener() {
        @Override
        public void onClick(View v) {
            Dialog dialog = new Dialog(context);
            dialog.setContentView(R.layout.add_update_layout);

            EditText edtName = dialog.findViewById(R.id.edtName);
            EditText edtNumber = dialog.findViewById(R.id.edtNumber);
            Button btnAction = dialog.findViewById(R.id.btnAction);
            TextView txtTitle = dialog.findViewById(R.id.txtTitle);

            btnAction.setText("Update");
            txtTitle.setText("Update Contact");
            edtName.setText(arrContacts.get(position).name);
            edtNumber.setText(arrContacts.get(position).number);

            btnAction.setOnClickListener(new View.OnClickListener() {
                @Override
                public void onClick(View v) {
                    String name="", number="";
                    if(!edtName.getText().toString().equals("")) {
                        name = edtName.getText().toString();
                    } else {
                        Toast.makeText(context, "Please Enter Contact Name!", Toast.LENGTH_SHORT).show();
                    }
                    if (!edtNumber.getText().toString().equals("")){
                        number = edtNumber.getText().toString();
                    }else {
                        Toast.makeText(context, "Enter a valid number!", Toast.LENGTH_SHORT).show();
                    }
                        arrContacts.set(position, new ContactModel(arrContacts.get(position).img, name, number));
                    notifyItemChanged(position);

                    dialog.dismiss();
                    }
            });

            dialog.show();
        }
    });
    holder.llRow.setOnLongClickListener(new View.OnLongClickListener() {
        @Override
        public boolean onLongClick(View v) {
            AlertDialog.Builder builder = new AlertDialog.Builder(context)
                    .setTitle("Delete Contact")
                    .setMessage("Are you sure want to delete")
                    .setIcon(R.drawable.baseline_delete_24)
                    .setPositiveButton("Yes", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {
                        arrContacts.remove(position);
                        notifyItemRemoved(position);
                        }
                    })
                    .setNegativeButton("No", new DialogInterface.OnClickListener() {
                        @Override
                        public void onClick(DialogInterface dialog, int which) {

                        }
                    });
            builder.show();
            return true;
        }
    });
    }

    @Override
    public int getItemCount() {
        return arrContacts.size();
    }

    public class ViewHolder extends RecyclerView.ViewHolder{

        TextView txtName, txtNumber;
        ImageView imgContact;
        LinearLayout llRow;
        public ViewHolder(View itemView){
            super(itemView);

            txtName = itemView.findViewById(R.id.txtName1);
            txtNumber = itemView.findViewById(R.id.txtName2);
            imgContact = itemView.findViewById(R.id.imgContact);
            llRow = itemView.findViewById(R.id.llRow);
        }
    }
}

3. ContactModel.java

package com.example.recyclerviewexample;

public class ContactModel {
    int img;
    String name, number;
    public ContactModel(int img, String Name, String Number){
        this.img = img;
        this.name = Name;
        this.number = Number;
    }

    public ContactModel(String name, String number){
        this.name = name;
        this.number = number;
    }
}

3. Xml

1. Activity_main.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"
    xmlns:tools="http://schemas.android.com/tools"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    tools:context=".MainActivity">

    <androidx.recyclerview.widget.RecyclerView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:id="@+id/recyclertxt"/>
    <com.google.android.material.floatingactionbutton.FloatingActionButton
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:tint="#fff"
        android:layout_alignParentBottom="true"
        android:id="@+id/btnOpenDialog"
        android:src="@drawable/contactsvg"
        android:layout_margin="21dp"/>
</RelativeLayout>

2. contact_row.xml 

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    xmlns:tools="http://schemas.android.com/tools"
    xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:gravity="center"
    android:layout_height="wrap_content">

    <androidx.cardview.widget.CardView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        app:cardCornerRadius="7dp"
        app:cardUseCompatPadding="true">

        <LinearLayout
            android:layout_width="match_parent"
            android:layout_height="wrap_content"
            android:gravity="center_vertical"
            android:id="@+id/llRow"
            android:padding="11dp">
                <ImageView
                    android:id="@+id/imgContact"
                    android:layout_width="70dp"
                    android:layout_height="70dp"
                    android:background="#C6F492"
                    android:contentDescription="Contact Image"
                    android:backgroundTint="#B9B4BA"
                    tools:src="@drawable/contactsvg"/>
            <LinearLayout
                android:layout_width="match_parent"
                android:layout_height="wrap_content"
                android:layout_marginLeft="11dp"
                android:layout_marginStart="11dp"
                android:orientation="vertical">
                <TextView
                    android:id="@+id/txtName1"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Contact"
                    android:textSize="22sp"
                    android:textStyle="bold"/>
                <TextView
                    android:id="@+id/txtName2"
                    android:layout_width="match_parent"
                    android:layout_height="wrap_content"
                    android:text="Contact Number"
                    android:textSize="16sp"/>
            </LinearLayout>
        </LinearLayout>
    </androidx.cardview.widget.CardView>
</LinearLayout>

3. add_update_layout.xml

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout
    xmlns:android="http://schemas.android.com/apk/res/android"
    android:layout_width="350dp"
    android:layout_height="wrap_content"
    android:background="#73D6E3"
    android:paddingLeft="21dp"
    android:paddingRight="21dp"
    android:paddingBottom="11dp"
    android:orientation="vertical">
    
    <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:gravity="center"
        android:textSize="32sp"
        android:textStyle="bold"
        android:textColor="#fff"
        android:id="@+id/txtTitle"
        android:layout_margin="21dp"
        android:text="Add Contact"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#fff"
        android:padding="11dp"
        android:id="@+id/edtName"
        android:hint="Enter Name"
        android:textSize="48dp"
        android:layout_marginBottom="11dp"
        android:layout_marginRight="11dp"
        android:inputType="text"/>

    <EditText
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:background="#fff"
        android:padding="11dp"
        android:id="@+id/edtNumber"
        android:hint="Enter Number"
        android:textSize="48dp"
        android:layout_marginBottom="11dp"
        android:layout_marginRight="11dp"
        android:inputType="number"/>
    
    <Button
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:text="Add"
        android:id="@+id/btnAction"
        android:backgroundTint="#fff"
        android:textColor="#73D6E3"
        android:layout_gravity="end"/>

</LinearLayout>



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