初始化

.gitignore

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+*.iml
+.gradle
+/local.properties
+/.idea/caches
+/.idea/libraries
+/.idea/modules.xml
+/.idea/workspace.xml
+/.idea/navEditor.xml
+/.idea/assetWizardSettings.xml
+.DS_Store
+/build
+/captures
+.externalNativeBuild
+.cxx
+local.properties

app/.gitignore

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+/build

app/build.gradle

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+plugins {
+    id 'com.android.application'
+    id 'org.jetbrains.kotlin.android'
+}
+
+android {
+    namespace 'com.phcbest.designpatterns'
+    compileSdk 33
+
+    defaultConfig {
+        applicationId "com.phcbest.designpatterns"
+        minSdk 26
+        targetSdk 33
+        versionCode 1
+        versionName "1.0"
+
+        testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled false
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+    kotlinOptions {
+        jvmTarget = '1.8'
+    }
+    buildFeatures {
+        viewBinding true
+    }
+}
+
+dependencies {
+
+    implementation 'androidx.core:core-ktx:1.7.0'
+    implementation 'androidx.appcompat:appcompat:1.6.1'
+    implementation 'com.google.android.material:material:1.9.0'
+    implementation 'androidx.constraintlayout:constraintlayout:2.1.4'
+    implementation 'androidx.lifecycle:lifecycle-livedata-ktx:2.6.1'
+    implementation 'androidx.lifecycle:lifecycle-viewmodel-ktx:2.6.1'
+    implementation 'androidx.navigation:navigation-fragment-ktx:2.5.3'
+    implementation 'androidx.navigation:navigation-ui-ktx:2.5.3'
+    testImplementation 'junit:junit:4.13.2'
+    androidTestImplementation 'androidx.test.ext:junit:1.1.5'
+    androidTestImplementation 'androidx.test.espresso:espresso-core:3.5.1'
+}

app/proguard-rules.pro

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+# Add project specific ProGuard rules here.
+# You can control the set of applied configuration files using the
+# proguardFiles setting in build.gradle.
+#
+# For more details, see
+#   http://developer.android.com/guide/developing/tools/proguard.html
+
+# If your project uses WebView with JS, uncomment the following
+# and specify the fully qualified class name to the JavaScript interface
+# class:
+#-keepclassmembers class fqcn.of.javascript.interface.for.webview {
+#   public *;
+#}
+
+# Uncomment this to preserve the line number information for
+# debugging stack traces.
+#-keepattributes SourceFile,LineNumberTable
+
+# If you keep the line number information, uncomment this to
+# hide the original source file name.
+#-renamesourcefileattribute SourceFile

app/src/androidTest/java/com/phcbest/designpatterns/ExampleInstrumentedTest.kt

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+package com.phcbest.designpatterns
+
+import androidx.test.platform.app.InstrumentationRegistry
+import androidx.test.ext.junit.runners.AndroidJUnit4
+
+import org.junit.Test
+import org.junit.runner.RunWith
+
+import org.junit.Assert.*
+
+/**
+ * Instrumented test, which will execute on an Android device.
+ *
+ * See [testing documentation](http://d.android.com/tools/testing).
+ */
+@RunWith(AndroidJUnit4::class)
+class ExampleInstrumentedTest {
+    @Test
+    fun useAppContext() {
+        // Context of the app under test.
+        val appContext = InstrumentationRegistry.getInstrumentation().targetContext
+        assertEquals("com.phcbest.designpatterns", appContext.packageName)
+    }
+}

app/src/main/AndroidManifest.xml

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+<?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="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:supportsRtl="true"
+        android:theme="@style/Theme.DesignPatterns"
+        tools:targetApi="31">
+        <activity
+            android:name=".MainActivity"
+            android:exported="true"
+            android:label="@string/app_name">
+            <intent-filter>
+                <action android:name="android.intent.action.MAIN" />
+
+                <category android:name="android.intent.category.LAUNCHER" />
+            </intent-filter>
+        </activity>
+    </application>
+
+</manifest>

app/src/main/java/com/phcbest/designpatterns/MainActivity.kt

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+package com.phcbest.designpatterns
+
+import android.os.Bundle
+import com.google.android.material.bottomnavigation.BottomNavigationView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.navigation.findNavController
+import androidx.navigation.ui.AppBarConfiguration
+import androidx.navigation.ui.setupActionBarWithNavController
+import androidx.navigation.ui.setupWithNavController
+import com.phcbest.designpatterns.databinding.ActivityMainBinding
+
+class MainActivity : AppCompatActivity() {
+
+    private lateinit var binding: ActivityMainBinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+
+        binding = ActivityMainBinding.inflate(layoutInflater)
+        setContentView(binding.root)
+
+        val navView: BottomNavigationView = binding.navView
+
+        val navController = findNavController(R.id.nav_host_fragment_activity_main)
+        // Passing each menu ID as a set of Ids because each
+        // menu should be considered as top level destinations.
+        val appBarConfiguration = AppBarConfiguration(
+            setOf(
+                R.id.navigation_home, R.id.navigation_dashboard, R.id.navigation_notifications
+            )
+        )
+        setupActionBarWithNavController(navController, appBarConfiguration)
+        navView.setupWithNavController(navController)
+    }
+}

app/src/main/java/com/phcbest/designpatterns/ui/dashboard/DashboardFragment.kt

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+package com.phcbest.designpatterns.ui.dashboard
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import com.phcbest.designpatterns.databinding.FragmentDashboardBinding
+
+class DashboardFragment : Fragment() {
+
+    private var _binding: FragmentDashboardBinding? = null
+
+    // This property is only valid between onCreateView and
+    // onDestroyView.
+    private val binding get() = _binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        val dashboardViewModel =
+            ViewModelProvider(this).get(DashboardViewModel::class.java)
+
+        _binding = FragmentDashboardBinding.inflate(inflater, container, false)
+        val root: View = binding.root
+
+        val textView: TextView = binding.textDashboard
+        dashboardViewModel.text.observe(viewLifecycleOwner) {
+            textView.text = it
+        }
+        return root
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}

app/src/main/java/com/phcbest/designpatterns/ui/dashboard/DashboardViewModel.kt

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+package com.phcbest.designpatterns.ui.dashboard
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class DashboardViewModel : ViewModel() {
+
+    private val _text = MutableLiveData<String>().apply {
+        value = "This is dashboard Fragment"
+    }
+    val text: LiveData<String> = _text
+}

app/src/main/java/com/phcbest/designpatterns/ui/home/HomeFragment.kt

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+package com.phcbest.designpatterns.ui.home
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import com.phcbest.designpatterns.databinding.FragmentHomeBinding
+
+class HomeFragment : Fragment() {
+
+    private var _binding: FragmentHomeBinding? = null
+
+    // This property is only valid between onCreateView and
+    // onDestroyView.
+    private val binding get() = _binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        val homeViewModel =
+            ViewModelProvider(this).get(HomeViewModel::class.java)
+
+        _binding = FragmentHomeBinding.inflate(inflater, container, false)
+        val root: View = binding.root
+
+        val textView: TextView = binding.textHome
+        homeViewModel.text.observe(viewLifecycleOwner) {
+            textView.text = it
+        }
+        return root
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}

app/src/main/java/com/phcbest/designpatterns/ui/home/HomeViewModel.kt

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+package com.phcbest.designpatterns.ui.home
+
+import androidx.lifecycle.LiveData
+import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.ViewModel
+
+class HomeViewModel : ViewModel() {
+
+    private val _text = MutableLiveData<String>().apply {
+        value = "This is home Fragment"
+    }
+    val text: LiveData<String> = _text
+}

app/src/main/java/com/phcbest/designpatterns/ui/notifications/NotificationsFragment.kt

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+package com.phcbest.designpatterns.ui.notifications
+
+import android.os.Bundle
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.fragment.app.Fragment
+import androidx.lifecycle.ViewModelProvider
+import com.phcbest.designpatterns.databinding.FragmentNotificationsBinding
+
+class NotificationsFragment : Fragment() {
+
+    private var _binding: FragmentNotificationsBinding? = null
+
+    // This property is only valid between onCreateView and
+    // onDestroyView.
+    private val binding get() = _binding!!
+
+    override fun onCreateView(
+        inflater: LayoutInflater,
+        container: ViewGroup?,
+        savedInstanceState: Bundle?
+    ): View {
+        val notificationsViewModel =
+            ViewModelProvider(this).get(NotificationsViewModel::class.java)
+
+        _binding = FragmentNotificationsBinding.inflate(inflater, container, false)
+        val root: View = binding.root
+
+        val textView: TextView = binding.textNotifications
+        notificationsViewModel.text.observe(viewLifecycleOwner) {
+            textView.text = it
+        }
+        return root
+    }
+
+    override fun onDestroyView() {
+        super.onDestroyView()
+        _binding = null
+    }
+}