refactor(automator): 转换为kotlin

common/build.gradle

@@ -1,4 +1,6 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
+apply plugin: 'kotlin-android-extensions'
 
 android {
     compileSdkVersion versions.compile
@@ -27,6 +29,7 @@ dependencies {
         exclude group: 'com.android.support', module: 'support-annotations'
     })
     testImplementation 'junit:junit:4.12'
+    api "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
     api 'com.android.support:support-annotations:28.0.0'
     api 'com.github.hyb1996:settingscompat:1.1.5'
 }

common/src/main/java/com/stardust/util/SparseArrayEntries.java

@@ -1,5 +1,6 @@
 package com.stardust.util;
 
+import android.support.annotation.NonNull;
 import android.util.SparseArray;
 
 /**
@@ -8,13 +9,14 @@ import android.util.SparseArray;
 
 public class SparseArrayEntries<E> {
 
-    private SparseArray<E> mSparseArray = new SparseArray<>();
+    private final SparseArray<E> mSparseArray = new SparseArray<>();
 
     public SparseArrayEntries<E> entry(int key, E value) {
         mSparseArray.put(key, value);
         return this;
     }
 
+    @NonNull
     public SparseArray<E> sparseArray() {
         return mSparseArray;
     }