Update: add some extensions and implement CommonLazy

README.md

@@ -1,5 +1,7 @@
 # AnkoUtil
 
+![version](https://jitpack.io/v/Mindjet/AnkoUtil.svg)
+
 >*Aka Android-Kotlin-Util*
 
 This is a library including **utils** and **function extension** for Android develop.  

library/src/main/java/io/github/mindjet/library/delegate/CommonLazy.kt

@@ -0,0 +1,33 @@
+package io.github.mindjet.library.delegate
+
+import android.app.Activity
+import android.view.View
+import kotlin.properties.ReadOnlyProperty
+import kotlin.reflect.KProperty
+
+/**
+ * Created by Mindjet on 2017/10/25.
+ */
+class CommonLazy<in T, out R>(private val initializer: (T, KProperty<*>) -> R) : ReadOnlyProperty<T, R> {
+
+    private var value: R? = null
+
+    override fun getValue(thisRef: T, property: KProperty<*>): R {
+        if (value == null) {
+            value = initializer(thisRef, property)
+        }
+        @Suppress("UNCHECKED_CAST")
+        return value as R
+    }
+
+}
+
+fun <T : View> Activity.bindView(id: Int): CommonLazy<Activity, T> {
+    return CommonLazy { activity, prop ->
+        activity.findViewById(id) ?: viewNotFound(activity, id, prop)
+    }
+}
+
+fun <T> viewNotFound(activity: Activity, id: Int, kProperty: KProperty<T>): Nothing {
+    throw ClassNotFoundException("View id $id is not found for ${kProperty.name} in ${activity::class.simpleName}")
+}

library/src/main/java/io/github/mindjet/library/extension/ActivityEx.kt

@@ -0,0 +1,11 @@
+package io.github.mindjet.library.extension
+
+import android.app.Activity
+import android.content.Intent
+
+/**
+ * Created by Mindjet on 2017/10/17.
+ */
+inline fun <reified T> Activity.start() {
+    this.startActivity(Intent(this, T::class.java))
+}

library/src/main/java/io/github/mindjet/library/extension/CollectionEx.kt

@@ -0,0 +1,8 @@
+package io.github.mindjet.library.extension
+
+/**
+ * Created by Mindjet on 2017/10/25.
+ */
+fun Int.toStream(): Array<Any?> {
+    return arrayOfNulls(this)
+}

library/src/main/java/io/github/mindjet/library/LogEx.kt → library/src/main/java/io/github/mindjet/library/extension/LogEx.kt

@@ -1,4 +1,4 @@
-package io.github.mindjet.library
+package io.github.mindjet.library.extension
 
 import android.content.Context
 import android.util.Log
@@ -8,7 +8,7 @@ import android.widget.Toast
  * Created by Mindjet on 2017/9/6.
  */
 val testString = "This is a string."
-var toast: Toast? = null
+private var toast: Toast? = null
 
 inline fun <reified T> T.log(log: Any) {
     Log.e(T::class.simpleName, log.toString())

library/src/main/java/io/github/mindjet/library/VersionEx.kt → library/src/main/java/io/github/mindjet/library/extension/VersionEx.kt

@@ -1,4 +1,4 @@
-package io.github.mindjet.library
+package io.github.mindjet.library.extension
 
 import android.os.Build
 

sample/src/main/java/io/github/mindjet/sample/MainActivity.kt

@@ -2,7 +2,7 @@ package io.github.mindjet.sample
 
 import android.os.Bundle
 import android.support.v7.app.AppCompatActivity
-import io.github.mindjet.library.*
+import io.github.mindjet.library.extension.*
 
 class MainActivity : AppCompatActivity() {