Initial commit with UI thread blocking demonstration

Author: techyourchance

.gitignore

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+
+#built application files
+*.apk
+*.ap_
+
+# files for the dex VM
+*.dex
+
+# Java class files
+*.class
+
+# generated files
+bin/
+gen/
+
+# Local configuration file (sdk path, etc)
+local.properties
+
+# Windows thumbnail db
+Thumbs.db
+
+# OSX files
+.DS_Store
+
+# Android Studio
+.idea/
+.gradle
+build/
+*.iml
+captures/
+.externalNativeBuild

app/.gitignore

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+/build

app/build.gradle

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+apply plugin: 'com.android.application'
+apply plugin: 'kotlin-android'
+
+android {
+    compileSdkVersion 29
+    defaultConfig {
+        applicationId "com.techyourchance.coroutines"
+        minSdkVersion 21
+        targetSdkVersion 29
+        versionCode 1
+        versionName "1.0"
+    }
+
+    signingConfigs {
+        release {
+            storeFile file('../release.keystore')
+            storePassword 'release'
+            keyAlias 'release'
+            keyPassword 'release'
+        }
+    }
+
+    buildTypes {
+        release {
+            minifyEnabled true
+            proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
+            signingConfig signingConfigs.release
+        }
+    }
+    compileOptions {
+        sourceCompatibility JavaVersion.VERSION_1_8
+        targetCompatibility JavaVersion.VERSION_1_8
+    }
+
+}
+
+dependencies {
+    implementation fileTree(dir: 'libs', include: ['*.jar'])
+    implementation 'androidx.appcompat:appcompat:1.2.0'
+
+    implementation 'com.ncapdevi:frag-nav:3.3.0'
+
+    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-core:$coroutines_version"
+    implementation "org.jetbrains.kotlinx:kotlinx-coroutines-android:$coroutines_version"
+}

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/main/AndroidManifest.xml

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+<?xml version="1.0" encoding="utf-8"?>
+<manifest package="com.techyourchance.coroutines"
+          xmlns:android="http://schemas.android.com/apk/res/android">
+
+    <application
+        android:name="com.techyourchance.coroutines.MyApplication"
+        android:allowBackup="true"
+        android:icon="@mipmap/ic_launcher"
+        android:label="@string/app_name"
+        android:roundIcon="@mipmap/ic_launcher_round"
+        android:supportsRtl="true"
+        android:theme="@style/AppTheme">
+        <activity android:name="com.techyourchance.coroutines.MainActivity">
+            <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/techyourchance/coroutines/MainActivity.kt

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+package com.techyourchance.coroutines
+
+import android.os.Bundle
+import android.view.View
+import android.widget.ImageButton
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import com.techyourchance.coroutines.common.ScreensNavigator
+import com.techyourchance.coroutines.common.ToolbarDelegate
+import com.techyourchance.coroutines.common.dependencyinjection.ActivityCompositionRoot
+
+class MainActivity : AppCompatActivity(), ToolbarDelegate {
+
+    private lateinit var screensNavigator: ScreensNavigator
+    private lateinit var btnBack: ImageButton
+    private lateinit var txtScreenTitle: TextView
+
+    val compositionRoot by lazy {
+        ActivityCompositionRoot(this,(application as MyApplication).applicationCompositionRoot)
+    }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_main)
+
+        screensNavigator = compositionRoot.screensNavigator
+        screensNavigator.init(savedInstanceState)
+
+        btnBack = findViewById(R.id.btn_back)
+        btnBack.setOnClickListener { screensNavigator.navigateUp() }
+
+        txtScreenTitle = findViewById(R.id.txt_screen_title)
+    }
+
+    override fun onSaveInstanceState(outState: Bundle) {
+        super.onSaveInstanceState(outState)
+        screensNavigator.onSaveInstanceState(outState)
+    }
+
+    override fun onBackPressed() {
+        if (!screensNavigator.navigateBack()) {
+            super.onBackPressed()
+        }
+    }
+
+    override fun setScreenTitle(screenTitle: String) {
+        txtScreenTitle.text = screenTitle
+    }
+
+    override fun showUpButton() {
+        btnBack.visibility = View.VISIBLE
+    }
+
+    override fun hideUpButton() {
+        btnBack.visibility = View.INVISIBLE
+    }
+}

app/src/main/java/com/techyourchance/coroutines/MyApplication.kt

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+package com.techyourchance.coroutines
+
+import android.app.Application
+import com.techyourchance.coroutines.common.dependencyinjection.ApplicationCompositionRoot
+
+class MyApplication : Application() {
+
+    val applicationCompositionRoot = ApplicationCompositionRoot()
+
+    override fun onCreate() {
+        super.onCreate()
+    }
+}

app/src/main/java/com/techyourchance/coroutines/common/BaseFragment.kt

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+package com.techyourchance.coroutines.common
+
+import android.os.Bundle
+import android.view.View
+import androidx.fragment.app.Fragment
+import com.techyourchance.coroutines.MainActivity
+
+abstract class BaseFragment : Fragment() {
+
+    protected open val screenTitle = ""
+
+    protected val compositionRoot get() = (requireActivity() as MainActivity).compositionRoot
+
+    protected lateinit var screensNavigator: ScreensNavigator
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        screensNavigator = compositionRoot.screensNavigator
+    }
+
+    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+        val toolbarManipulator = compositionRoot.toolbarManipulator
+        toolbarManipulator.setScreenTitle(screenTitle)
+        if (screensNavigator.isRootScreen()) {
+            toolbarManipulator.hideUpButton()
+        } else {
+            toolbarManipulator.showUpButton()
+        }
+    }
+
+
+}

app/src/main/java/com/techyourchance/coroutines/common/ScreensNavigator.kt

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+package com.techyourchance.coroutines.common
+
+import android.os.Bundle
+import com.ncapdevi.fragnav.FragNavController
+import com.ncapdevi.fragnav.FragNavController.RootFragmentListener
+import com.techyourchance.coroutines.demonstrations.uithread.UiThreadDemoFragment
+import com.techyourchance.coroutines.home.HomeFragment
+
+class ScreensNavigator(private val mFragNavController: FragNavController) {
+
+    fun init(savedInstanceState: Bundle?) {
+        mFragNavController.rootFragmentListener = object : RootFragmentListener {
+            override val numberOfRootFragments get() = 1
+
+            override fun getRootFragment(index: Int) = HomeFragment.newInstance()
+        }
+
+        mFragNavController.initialize(FragNavController.TAB1, savedInstanceState)
+    }
+
+    fun onSaveInstanceState(outState: Bundle?) {
+        mFragNavController.onSaveInstanceState(outState)
+    }
+
+    fun isRootScreen() = mFragNavController.isRootFragment
+
+    fun navigateBack(): Boolean {
+        if (mFragNavController.isRootFragment) {
+            return false
+        } else {
+            mFragNavController.popFragment()
+            return true
+        }
+    }
+
+    fun navigateUp() {
+        mFragNavController.popFragment()
+    }
+
+    fun toHomeScreen() {
+        mFragNavController.clearStack()
+        mFragNavController.pushFragment(HomeFragment.newInstance())
+    }
+
+    fun toUiThreadDemonstration() {
+        mFragNavController.pushFragment(UiThreadDemoFragment.newInstance())
+    }
+
+}

app/src/main/java/com/techyourchance/coroutines/common/ThreadInfoLogger.kt

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+package com.techyourchance.coroutines.common
+
+import android.util.Log
+
+object ThreadInfoLogger {
+
+    private const val TAG = "ThreadInfoLogger"
+
+    fun logThreadInfo(message: String) {
+        Log.i(TAG, "$message; thread name: ${Thread.currentThread().name}; thread ID: ${Thread.currentThread().id}")
+    }
+
+}

app/src/main/java/com/techyourchance/coroutines/common/ToolbarDelegate.kt

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+package com.techyourchance.coroutines.common
+
+interface ToolbarDelegate {
+    fun setScreenTitle(screenTitle: String)
+    fun showUpButton()
+    fun hideUpButton()
+}

app/src/main/java/com/techyourchance/coroutines/common/dependencyinjection/ActivityCompositionRoot.kt

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+package com.techyourchance.coroutines.common.dependencyinjection
+
+import androidx.fragment.app.FragmentActivity
+import com.ncapdevi.fragnav.FragNavController
+import com.techyourchance.coroutines.R
+import com.techyourchance.coroutines.common.ScreensNavigator
+import com.techyourchance.coroutines.common.ToolbarDelegate
+
+class ActivityCompositionRoot(
+        private val activity: FragmentActivity,
+        private val appCompositionRoot: ApplicationCompositionRoot
+) {
+
+    val toolbarManipulator get() = activity as ToolbarDelegate
+
+    val screensNavigator: ScreensNavigator by lazy {
+        ScreensNavigator(fragNavController)
+    }
+
+    private val fragNavController get() = FragNavController(fragmentManager, R.id.frame_content)
+
+    private val fragmentManager get() = activity.supportFragmentManager
+
+
+}

app/src/main/java/com/techyourchance/coroutines/common/dependencyinjection/ApplicationCompositionRoot.kt

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+package com.techyourchance.coroutines.common.dependencyinjection
+
+class ApplicationCompositionRoot