Initial code for the migration examples

Author: neboskreb

examples/migration-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:name=".App"
+        android:allowBackup="false"
+        android:label="Migration Example"
+        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>

examples/migration-app/src/main/kotlin/com/github/neboskreb/log4j2/examples/migration/App.kt

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+package com.github.neboskreb.log4j2.examples.migration
+
+import android.app.Application
+
+class App : Application() {
+
+    override fun onCreate() {
+        super.onCreate()
+    }
+}

examples/migration-app/src/main/kotlin/com/github/neboskreb/log4j2/examples/migration/MainActivity.kt

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+package com.github.neboskreb.log4j2.examples.migration
+
+import android.app.Activity
+import android.os.Bundle
+import android.util.Log
+
+import com.github.neboskreb.log4j2.examples.migration.lib.MyLibrary
+
+private const val TAG = "MAIN_ACTIVITY"
+
+class MainActivity : Activity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        Log.w(null, "This is a NULL-TAG message")
+        Log.w(TAG, "This is a test warning message")
+
+        super.onCreate(savedInstanceState)
+        Log.i(TAG, "Activity created")
+
+        setContentView(R.layout.content_main)
+        Log.d(TAG, "ContentView is set")
+
+        Log.wtf(TAG, "This is a test WTF message with a stack trace", Throwable("WTF Exception"))
+
+        MyLibrary().logSomething()
+    }
+}

examples/migration-app/src/main/res/layout/content_main.xml

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+<?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">
+
+    <TextView
+        android:layout_width="wrap_content"
+        android:layout_height="wrap_content"
+        android:text="Hello World!" />
+</RelativeLayout>

examples/migration-lib/src/androidTest/kotlin/com/github/neboskreb/log4j2/examples/migration/lib/MyLibraryAndroidTest.kt

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+package com.github.neboskreb.log4j2.examples.migration.lib
+
+import org.junit.jupiter.api.Test
+
+class MyLibraryAndroidTest {
+    @Test
+    fun logSomething() {
+        // GIVEN
+        val library = MyLibrary()
+
+        // WHEN
+        library.logSomething()
+
+        // THEN see the logs
+    }
+}

examples/migration-lib/src/main/kotlin/com/github/neboskreb/log4j2/examples/migration/lib/MyLibrary.kt

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+package com.github.neboskreb.log4j2.examples.migration.lib
+
+import android.util.Log
+
+private const val TAG = "MY_LIBRARY"
+
+class MyLibrary {
+    fun logSomething() {
+        Log.i(TAG, "Library logged this INFO message")
+
+        Log.w(TAG, "Library logged this WARN message")
+
+        Log.wtf(TAG, "Library logged this WTF message")
+    }
+}

examples/migration-lib/src/test/kotlin/com/github/neboskreb/log4j2/examples/migration/lib/MyLibraryTest.kt

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+package com.github.neboskreb.log4j2.examples.migration.lib
+
+import org.junit.jupiter.api.Test
+
+class MyLibraryTest {
+    @Test
+    fun logSomething() {
+        // GIVEN
+        val library = MyLibrary()
+
+        // WHEN
+        library.logSomething()
+
+        // THEN see the logs
+    }
+}