add Disposable extension : bindTo

rxlifecycle/build.gradle

@@ -1,34 +1,26 @@
 apply plugin: 'com.android.library'
+apply plugin: 'kotlin-android'
 
 android {
     compileSdkVersion 27
 
-
-
     defaultConfig {
         minSdkVersion 21
         targetSdkVersion 27
         versionCode 1
         versionName "1.0"
 
         testInstrumentationRunner "android.support.test.runner.AndroidJUnitRunner"
-
     }
-
-    buildTypes {
-        release {
-            minifyEnabled false
-            proguardFiles getDefaultProguardFile('proguard-android.txt'), 'proguard-rules.pro'
-        }
-    }
-
 }
 
 dependencies {
     implementation fileTree(dir: 'libs', include: ['*.jar'])
+    compile "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
 
     implementation 'com.android.support:appcompat-v7:27.1.1'
     testImplementation 'junit:junit:4.12'
-    androidTestImplementation 'com.android.support.test:runner:1.0.2'
-    androidTestImplementation 'com.android.support.test.espresso:espresso-core:3.0.2'
+
+    // rxjava
+    implementation 'io.reactivex.rxjava2:rxjava:2.1.9'
 }

rxlifecycle/src/main/java/com/github/caoddx/rxlifecycle/DisposableExt.kt

@@ -0,0 +1,24 @@
+package com.github.caoddx.rxlifecycle
+
+import android.arch.lifecycle.GenericLifecycleObserver
+import android.arch.lifecycle.Lifecycle
+import android.arch.lifecycle.LifecycleOwner
+import io.reactivex.disposables.Disposable
+
+fun Disposable.bindTo(owner: LifecycleOwner): Disposable {
+
+    owner.lifecycle.addObserver(object : GenericLifecycleObserver {
+        override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event) {
+
+            if (event == Lifecycle.Event.ON_DESTROY) {
+                dispose()
+            }
+
+            if (isDisposed) {
+                source.lifecycle.removeObserver(this)
+            }
+        }
+    })
+
+    return this
+}