Convert code to Kotlin

Author: yongce

android_project_common.gradle

@@ -35,14 +35,14 @@ ext {
             'compileSdk'       : 28,
 
             // Android official support
-            'kotlin'           : "1.3.30",
+            'kotlin'           : "1.3.31",
             'supportLib'       : "28.0.0",
             'multidexLib'      : "2.0.1",
             'constraintLayout' : "1.1.3",
             'lintLib'          : "26.4.0",
-            'archCore'         : "2.0.0-rc01",
-            'lifecycle'        : "2.0.0-rc01",
-            'room'             : "2.0.0-rc01",
+            'archCore'         : "2.0.0",
+            'lifecycle'        : "2.0.0",
+            'room'             : "2.0.0",
 
             // test
             'runner'           : "1.1.0",
@@ -60,7 +60,7 @@ ext {
             'wearableSupport'  : "2.3.0",
 
             // infrastructure
-            'butterknife'      : "10.0.0",
+            'butterknife'      : "10.1.0",
             'timber'           : "4.7.1",
             'guava'            : "23.5-android",
 

archLib/src/main/java/me/ycdev/android/arch/ArchConstants.java

@@ -0,0 +1,21 @@
+package me.ycdev.android.arch
+
+import android.widget.Toast
+import androidx.annotation.IntDef
+
+object ArchConstants {
+    const val INTENT_TYPE_ACTIVITY = 1
+    const val INTENT_TYPE_BROADCAST = 2
+    const val INTENT_TYPE_SERVICE = 3
+
+    @IntDef(INTENT_TYPE_ACTIVITY, INTENT_TYPE_BROADCAST, INTENT_TYPE_SERVICE)
+    @Retention(AnnotationRetention.SOURCE)
+    annotation class IntentType
+
+    /*
+     * Durations for toast
+     */
+    @IntDef(Toast.LENGTH_SHORT, Toast.LENGTH_LONG)
+    @Retention(AnnotationRetention.SOURCE)
+    annotation class ToastDuration
+}

archLib/src/main/java/me/ycdev/android/arch/ArchConstants.kt

@@ -0,0 +1,22 @@
+package me.ycdev.android.arch.activity
+
+import android.os.Bundle
+import androidx.appcompat.app.AppCompatActivity
+
+/**
+ * Base class for Activity which wants to inherit
+ * [androidx.appcompat.app.AppCompatActivity].
+ */
+abstract class AppCompatBaseActivity : AppCompatActivity() {
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        if (shouldSetDisplayHomeAsUpEnabled()) {
+            val actionBar = supportActionBar
+            actionBar?.setDisplayHomeAsUpEnabled(true)
+        }
+    }
+
+    protected open fun shouldSetDisplayHomeAsUpEnabled(): Boolean {
+        return true
+    }
+}

archLib/src/main/java/me/ycdev/android/arch/activity/AppCompatBaseActivity.java

@@ -0,0 +1,8 @@
+package me.ycdev.android.arch.activity
+
+import android.app.Activity
+
+/**
+ * Base class for Activity which wants to inherit [android.app.Activity].
+ */
+abstract class BaseActivity : Activity() // nothing to do right now

archLib/src/main/java/me/ycdev/android/arch/activity/AppCompatBaseActivity.kt

@@ -0,0 +1,9 @@
+package me.ycdev.android.arch.activity
+
+import android.preference.PreferenceActivity
+
+/**
+ * Base class for Activity which wants to inherit
+ * [android.preference.PreferenceActivity].
+ */
+abstract class PreferenceBaseActivity : PreferenceActivity() // nothing to do right now