پروژه ی عملی از دیتابایندینگ و نویگیشن در اندروید

<?xml version="1.0" encoding="utf-8"?>

<layout xmlns:android="http://schemas.android.com/apk/res/android">

    <LinearLayout xmlns:app="http://schemas.android.com/apk/res-auto"
    android:layout_width="match_parent"
    android:layout_height="match_parent"
    android:orientation="vertical"
    android:gravity="center">

        <TextView
        android:layout_width="match_parent"
        android:layout_height="wrap_content"
        android:padding="8dp"
        android:layout_margin="16dp"
        android:text="@string/login_label_description"
        android:gravity="center"
        />

        <EditText
        android:id="@+id/username_input"
        android:layout_width="280dp"
        android:layout_height="wrap_content"
        android:inputType="textAutoComplete"
        android:layout_margin="8dp"
        />

        <EditText
        android:id="@+id/password_input"
        android:layout_width="280dp"
        android:layout_height="wrap_content"
        android:inputType="textPassword"
        android:layout_margin="8dp"
        app:hintEnabled="true"
        app:helperText="Input" />

        <Button
        android:id="@+id/login_button"
        android:layout_width="280dp"
        android:layout_height="wrap_content"
        android:layout_margin="8dp"
        android:text="@string/login"
        />

    </LinearLayout>

</layout>
                        

package com.skybirdbits.logindemo

import androidx.fragment.app.Fragment

class ProfileFragment: Fragment() {
}
                        

<?xml version="1.0" encoding="utf-8"?>
<navigation 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:id="@+id/main_nav_graph"
    app:startDestination="@id/loginFragment">

    <fragment
        android:id="@+id/loginFragment"
        android:name="com.skybirdbits.logindemo.LoginFragment"
        android:label="LoginFragment"
        tools:layout="@layout/fragment_login">
        <action
            android:id="@+id/from_loginFragment_to_profileFragment"
            app:destination="@id/profileFragment"
            app:popUpTo="@id/loginFragment"
            app:popUpToInclusive="true">

            <argument
                android:name="usrname"
                app:argType="string"
                app:nullable="false" />

            <argument
                android:name="id"
                app:argType="string"
                app:nullable="false"/>

        </action>
    </fragment>

    <fragment
        android:id="@+id/profileFragment"
        android:name="com.skybirdbits.logindemo.ProfileFragment"
        android:label="ProfileFragment"
        tools:layout="@layout/fragment_profile" >

        <action
            android:id="@+id/from_profileFragment_to_loginFragment"
            app:destination="@id/loginFragment"
            app:popUpTo="@id/profileFragment"
            app:popUpToInclusive="true" />

    </fragment>

</navigation>
                        

<?xml version="1.0" encoding="utf-8"?>
<merge  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.fragment.app.FragmentContainerView
            android:id="@+id/nav_host_fragment_container"
            android:layout_width="match_parent"
            android:layout_height="match_parent"
            android:name="androidx.navigation.fragment.NavHostFragment"
            app:navGraph="@navigation/main_nav_graph"
            app:defaultNavHost="true" />

</merge>
                        

package com.skybirdbits.logindemo

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.navigation.fragment.findNavController
import com.google.android.material.snackbar.Snackbar
import com.skybirdbits.logindemo.databinding.FragmentLoginBinding
import kotlin.random.Random

class LoginFragment: Fragment() {

    override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
    ): View {

    val binding = FragmentLoginBinding.inflate(inflater, container , false)

    val usernameInput = binding.usernameInput
    val passwordInput = binding.passwordInput


    binding.loginButton.setOnClickListener {
        val username = usernameInput.text.toString()
        val password = passwordInput.text.toString()
        val id = Random(1000)

        if(password.isNotBlank() && username.isNotBlank()) {
            Snackbar.make(binding.root, "Welcome $username" , Snackbar.LENGTH_SHORT).show()
            val action =
            LoginFragmentDirections.fromLoginFragmentToProfileFragment(username, id.nextLong().toString())
            findNavController().navigate(action)
            }else {
            Toast.makeText(context , "Username and password should not be empty!", Toast.LENGTH_SHORT).show()
            }
        }


    return binding.root
    }
}
                        

package com.skybirdbits.logindemo

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.navigation.fragment.findNavController
import com.google.android.material.snackbar.Snackbar
import com.skybirdbits.logindemo.databinding.FragmentProfileBinding

class ProfileFragment: Fragment() {

    override fun onCreateView(
    inflater: LayoutInflater,
    container: ViewGroup?,
    savedInstanceState: Bundle?
    ): View {

        val binding = FragmentProfileBinding.inflate(inflater, container, false)

        val username = requireArguments().getString("usrname")
        val id = requireArguments().getString("id")

        binding.username = username
        binding.userId = id

        binding.logoutButton.setOnClickListener {
            val action = ProfileFragmentDirections.fromProfileFragmentToLoginFragment()
            findNavController().navigate(action)
            Snackbar.make(binding.root,"You've been logged out", Snackbar.LENGTH_SHORT).show()
        }

        return binding.root
    }
}