Как назначить на кнопку действие добавления задачи вместо клика на Menu item?

написал приложение список задач по туториалу. Задачи добавляются при клике на пункт меню(иконка плюса справа вверху)

Как сделать,чтобы новая задача добавлялась не по клику на пункт меню, а на мою кастомную кнопку?
Разметку кнопки я сделал, а вот как повесить метод,который бы всё это реализовывал?

Main_menu.xml:

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

    <item
        android:id="@+id/action_add_task"
        android:icon="@drawable/add_item"
        android:title="@string/add_task"
        app:showAsAction="always"
        />
</menu>

item_todo.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="match_parent"
    android:layout_gravity="center_vertical">

    <TextView
        android:id="@+id/task_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:text="@string/hi"
        android:textSize="20sp" />




    <Button
        android:id="@+id/task_delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:onClick="deleteTask"
        android:text="@string/done" />

</RelativeLayout>

activity_main:

<?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">

    <ListView
        android:id="@+id/list_todo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </ListView>

    <Button

    android:id="@+id/btnAdd"
    android:layout_width="65dp"
    android:layout_height="65dp"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_margin="20dp"
    android:background="@drawable/circle"
    />   
        
</RelativeLayout>

класс MainActivity:

package com.kentforth.list5;

import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;



import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private TaskHelper mHelper;
    private ListView mTaskListView;
    private ArrayAdapter<String> mAdapter;
    Button btnAdd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mHelper = new TaskHelper(this);
        mTaskListView = (ListView) findViewById(R.id.list_todo);
        btnAdd = (Button) findViewById(R.id.btnAdd);

        updateUI();
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);
        return super.onCreateOptionsMenu(menu);

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_add_task:
                final EditText taskEditText = new EditText(this);
                AlertDialog dialog = new AlertDialog.Builder(this)
                        .setTitle("New Task")
                        .setMessage("Add a new task")
                        .setView(taskEditText)
                        .setPositiveButton("Add", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                String task = String.valueOf(taskEditText.getText());
                                SQLiteDatabase db = mHelper.getWritableDatabase();
                                ContentValues values = new ContentValues();
                                values.put(Task.TaskEntry.COL_TASK_TITLE, task);
                                db.insertWithOnConflict(Task.TaskEntry.TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
                                db.close();
                                updateUI();

                            }
                        })

                        .setNegativeButton("Cancel", null)
                        .create();
                dialog.show();
                return true;

            default:
                return super.onOptionsItemSelected(item);

        }
    }


    private void updateUI() {

        ArrayList<String> taskList = new ArrayList<>();
        SQLiteDatabase db = mHelper.getReadableDatabase();
        Cursor cursor = db.query(Task.TaskEntry.TABLE,
                new String[] {Task.TaskEntry._ID, Task.TaskEntry.COL_TASK_TITLE}, null, null, null, null, null);
        while (cursor.moveToNext()) {
            int index = cursor.getColumnIndex(Task.TaskEntry.COL_TASK_TITLE);
            taskList.add(cursor.getString(index));
        }

        if (mAdapter == null) {
            mAdapter = new ArrayAdapter<>(this, R.layout.item_todo, R.id.task_title, taskList);
            mTaskListView.setAdapter(mAdapter);
        } else {
            mAdapter.clear();
            mAdapter.addAll(taskList);
            mAdapter.notifyDataSetChanged();

        }

        cursor.close();
        db.close();
    }

    public void deleteTask(View view) {
        View parent = (View) view.getParent();
        TextView taskTextView = (TextView) parent.findViewById(R.id.task_title);
        String task = String.valueOf(taskTextView.getText());
        SQLiteDatabase db = mHelper.getWritableDatabase();
        db.delete(Task.TaskEntry.TABLE, Task.TaskEntry.COL_TASK_TITLE + " = ?", new String[]{task});
        db.close();
        updateUI();
    }


}

класс Task:

package com.kentforth.list5;

import android.provider.BaseColumns;

public class Task {

    public static final String DB_NAME = "ToDoDB";
    public static final int DB_VERSION = 1;

    public class TaskEntry implements BaseColumns {
        public static final String TABLE = "tasks";
        public static final String COL_TASK_TITLE = "title";
    }

}

класс TaskHelper:

package com.kentforth.list5;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class TaskHelper extends SQLiteOpenHelper{

    public TaskHelper(Context context) {
        super(context, Task.DB_NAME, null, Task.DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + Task.TaskEntry.TABLE + " ( " +
                                       Task.TaskEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                                       Task.TaskEntry.COL_TASK_TITLE + " TEXT NOT NULL);";
        db.execSQL(createTable);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS" + Task.TaskEntry.TABLE);
        onCreate(db);
    }

}

lonata 7 сент.

Версия #1, старая

Как назначить на кнопку действие добавления задачи вместо клика на Menu item?

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

    <item
        android:id="@+id/action_add_task"
        android:icon="@drawable/add_item"
        android:title="@string/add_task"
        app:showAsAction="always"
        />
</menu>

item_todo.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="match_parent"
    android:layout_gravity="center_vertical">

    <TextView
        android:id="@+id/task_title"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentLeft="true"
        android:layout_alignParentStart="true"
        android:text="@string/hi"
        android:textSize="20sp" />




    <Button
        android:id="@+id/task_delete"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content"
        android:layout_alignParentEnd="true"
        android:layout_alignParentRight="true"
        android:onClick="deleteTask"
        android:text="@string/done" />

</RelativeLayout>

activity_main:

<?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">

    <ListView
        android:id="@+id/list_todo"
        android:layout_width="wrap_content"
        android:layout_height="wrap_content">

    </ListView>

    <Button

    android:id="@+id/btnAdd"
    android:layout_width="65dp"
    android:layout_height="65dp"
    android:layout_alignParentBottom="true"
    android:layout_alignParentRight="true"
    android:layout_margin="20dp"
    android:background="@drawable/circle"
    />   
        
</RelativeLayout>

класс MainActivity:

package com.kentforth.list5;

import android.content.ContentValues;
import android.content.DialogInterface;
import android.database.Cursor;
import android.database.sqlite.SQLiteDatabase;

import android.support.v7.app.AlertDialog;
import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.Menu;
import android.view.MenuItem;
import android.view.View;
import android.widget.ArrayAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ListView;
import android.widget.TextView;



import java.util.ArrayList;

public class MainActivity extends AppCompatActivity {

    private static final String TAG = "MainActivity";
    private TaskHelper mHelper;
    private ListView mTaskListView;
    private ArrayAdapter<String> mAdapter;
    Button btnAdd;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        mHelper = new TaskHelper(this);
        mTaskListView = (ListView) findViewById(R.id.list_todo);
        btnAdd = (Button) findViewById(R.id.btnAdd);

        updateUI();
    }


    @Override
    public boolean onCreateOptionsMenu(Menu menu) {
        getMenuInflater().inflate(R.menu.main_menu, menu);
        return super.onCreateOptionsMenu(menu);

    }

    @Override
    public boolean onOptionsItemSelected(MenuItem item) {
        switch (item.getItemId()) {
            case R.id.action_add_task:
                final EditText taskEditText = new EditText(this);
                AlertDialog dialog = new AlertDialog.Builder(this)
                        .setTitle("New Task")
                        .setMessage("Add a new task")
                        .setView(taskEditText)
                        .setPositiveButton("Add", new DialogInterface.OnClickListener() {
                            @Override
                            public void onClick(DialogInterface dialog, int which) {
                                String task = String.valueOf(taskEditText.getText());
                                SQLiteDatabase db = mHelper.getWritableDatabase();
                                ContentValues values = new ContentValues();
                                values.put(Task.TaskEntry.COL_TASK_TITLE, task);
                                db.insertWithOnConflict(Task.TaskEntry.TABLE, null, values, SQLiteDatabase.CONFLICT_REPLACE);
                                db.close();
                                updateUI();

                            }
                        })

                        .setNegativeButton("Cancel", null)
                        .create();
                dialog.show();
                return true;

            default:
                return super.onOptionsItemSelected(item);

        }
    }


    private void updateUI() {

        ArrayList<String> taskList = new ArrayList<>();
        SQLiteDatabase db = mHelper.getReadableDatabase();
        Cursor cursor = db.query(Task.TaskEntry.TABLE,
                new String[] {Task.TaskEntry._ID, Task.TaskEntry.COL_TASK_TITLE}, null, null, null, null, null);
        while (cursor.moveToNext()) {
            int index = cursor.getColumnIndex(Task.TaskEntry.COL_TASK_TITLE);
            taskList.add(cursor.getString(index));
        }

        if (mAdapter == null) {
            mAdapter = new ArrayAdapter<>(this, R.layout.item_todo, R.id.task_title, taskList);
            mTaskListView.setAdapter(mAdapter);
        } else {
            mAdapter.clear();
            mAdapter.addAll(taskList);
            mAdapter.notifyDataSetChanged();

        }

        cursor.close();
        db.close();
    }

    public void deleteTask(View view) {
        View parent = (View) view.getParent();
        TextView taskTextView = (TextView) parent.findViewById(R.id.task_title);
        String task = String.valueOf(taskTextView.getText());
        SQLiteDatabase db = mHelper.getWritableDatabase();
        db.delete(Task.TaskEntry.TABLE, Task.TaskEntry.COL_TASK_TITLE + " = ?", new String[]{task});
        db.close();
        updateUI();
    }


}

класс Task:

package com.kentforth.list5;

import android.provider.BaseColumns;

public class Task {

    public static final String DB_NAME = "ToDoDB";
    public static final int DB_VERSION = 1;

    public class TaskEntry implements BaseColumns {
        public static final String TABLE = "tasks";
        public static final String COL_TASK_TITLE = "title";
    }

}

класс TaskHelper:

package com.kentforth.list5;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteOpenHelper;

public class TaskHelper extends SQLiteOpenHelper{

    public TaskHelper(Context context) {
        super(context, Task.DB_NAME, null, Task.DB_VERSION);
    }

    @Override
    public void onCreate(SQLiteDatabase db) {
String createTable = "CREATE TABLE " + Task.TaskEntry.TABLE + " ( " +
                                       Task.TaskEntry._ID + " INTEGER PRIMARY KEY AUTOINCREMENT, " +
                                       Task.TaskEntry.COL_TASK_TITLE + " TEXT NOT NULL);";
        db.execSQL(createTable);
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS" + Task.TaskEntry.TABLE);
        onCreate(db);
    }

}

Как назначить на кнопку действие добавления задачи вместо клика на Menu item?

Как назначить на кнопку действие добавления задачи вместо клика на Menu item?

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