Support reflection

README.md

@@ -15,22 +15,37 @@ ViewBinding-ktx
       For saving memory, you should set the `binding` variable to null after onDestroyView.
 
 ## Overview
-- `ViewBinding-ktx` provide the unified way of declaring the `binding` variable in Activity and Fragment.
-- `ViewBinding-ktx` is saving memory because of cleaning up the `binding` variable having the view tree after onDestroyView.
-- `ViewBinding-ktx` needs one of the following
+`ViewBinding-ktx`
+- provides the unified way of declaring the `binding` variable
+    - between Activity and Fragment.
+    - between DataBinding-ktx and ViewBinding-ktx.
+- is saving memory
+    - The `binding` variable is stored as the Fragment's view's tag.
+    - The `binding` variable is cleaning up along with the Fragment's view after onDestroyView.
+- needs one of the following
     - calling `setContentView` in Activity and calling `inflater.inflate` in `onCreateView` of Fragment.
     - calling Activity/Fragment's secondary constructor passing layout res id.
 
-## Usage 
+## Usage
+
+### Reflection
+
+```kotlin
+private val binding: ViewBindingActivityBinding by viewBinding()
+```
+
+### No reflection
+
 ```kotlin
 private val binding by viewBinding { ViewBindingActivityBinding.bind(it) }
 ```
+
 ### Activity
 - Use Activity's secondary constructor passing layout res id.
 ```kotlin
 class ViewBindingActivity : AppCompatActivity(R.layout.view_binding_activity) {
     // Declare the `binding` variable using `by viewBinding()`.
-    private val binding by viewBinding(ViewBindingActivityBinding::bind)
+    private val binding: ViewBindingActivityBinding by viewBinding()
     override fun onCreate(savedInstanceState: Bundle?) {
         super.onCreate(savedInstanceState)
         // You can use binding
@@ -43,43 +58,7 @@ class ViewBindingActivity : AppCompatActivity(R.layout.view_binding_activity) {
 ```kotlin
 class ViewBindingFragment : Fragment(R.layout.view_binding_fragment) {
     // Declare the `binding` variable using `by viewBinding()`.
-    private val binding by viewBinding(ViewBindingFragmentBinding::bind)
-    // DO NOT override onCreateView
-    override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-        super.onViewCreated(view, savedInstanceState)
-        // You can use binding
-    }
-}
-```
-
-
-## Note
-### Activity
-- If you forget to use Activity's secondary constructor passing layout res id, your app crash.
-
-```kotlin
-// You can define and use ViewBindingAppCompatActivity for not forgetting.
-open class ViewBindingAppCompatActivity<T : ViewBinding>(@LayoutRes contentLayoutId: Int, bind: (View) -> T) : AppCompatActivity(contentLayoutId) {
-    protected val binding by viewBinding(bind)
-}
-
-class YourActivity : ViewBindingAppCompatActivity<YourActivityBinding>(R.layout.your_activity, YourActivityBinding::bind) {
-    override fun onCreate(savedInstanceState: Bundle?) {
-        super.onCreate(savedInstanceState)
-        // You can use binding
-    }
-}
-```
-
-### Fragment
-- If you forget to use Fragment's secondary constructor passing layout res id, Fragment is not shown.
-
-```kotlin
-// You can define and use ViewBindingFragment for not forgetting.
-open class ViewBindingFragment<T : ViewBinding>(@LayoutRes contentLayoutId : Int, bind: (View) -> T) : Fragment(contentLayoutId) {
-    protected val binding: T by viewBinding(bind)
-} 
-class YourFragment : ViewBindingFragment<YourFragmentBinding>(R.layout.your_fragment) {
+    private val binding: ViewBindingFragmentBinding by viewBinding()
     // DO NOT override onCreateView
     override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
         super.onViewCreated(view, savedInstanceState)

ViewBinding-ktx/build.gradle

@@ -3,17 +3,14 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-kapt'
 
 android {
-    compileSdkVersion 29
-    defaultConfig {
-        minSdkVersion 15
-        targetSdkVersion 29
-    }
+    compileSdkVersion 30
     buildFeatures {
         viewBinding = true
     }
 }
 
 dependencies {
-    implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'androidx.fragment:fragment:1.2.5'
+    compileOnly "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
+    //noinspection GradleDependency
+    implementation 'androidx.fragment:fragment-ktx:1.1.0'
 }

ViewBinding-ktx/src/main/java/com/wada811/viewbinding/ActivityViewBinding.kt

@@ -7,13 +7,13 @@ import android.view.ViewGroup
 import androidx.fragment.app.FragmentActivity
 import androidx.viewbinding.ViewBinding
 
-fun <T : ViewBinding> FragmentActivity.viewBinding(bind: (View) -> T): Lazy<T> = object : Lazy<T> {
+inline fun <reified T : ViewBinding> FragmentActivity.viewBinding(
+    crossinline bind: (View) -> T = { T::class.java.getMethod("bind", View::class.java).invoke(null, it) as T }
+): Lazy<T> = object : Lazy<T> {
     private var binding: T? = null
     override fun isInitialized(): Boolean = binding != null
     override val value: T
-        get() = binding ?: bind(getContentView()).also {
-            binding = it
-        }
+        get() = binding ?: bind(getContentView()).also { binding = it }
 
     private fun FragmentActivity.getContentView(): View {
         return checkNotNull(findViewById<ViewGroup>(android.R.id.content).getChildAt(0)) {

ViewBinding-ktx/src/main/java/com/wada811/viewbinding/FragmentViewBinding.kt

@@ -6,7 +6,9 @@ import androidx.viewbinding.ViewBinding
 import kotlin.properties.ReadOnlyProperty
 import kotlin.reflect.KProperty
 
-fun <T : ViewBinding> Fragment.viewBinding(bind: (View) -> T): ReadOnlyProperty<Fragment, T> = object : ReadOnlyProperty<Fragment, T> {
+inline fun <reified T : ViewBinding> Fragment.viewBinding(
+    crossinline bind: (View) -> T = { T::class.java.getMethod("bind", View::class.java).invoke(null, it) as T }
+): ReadOnlyProperty<Fragment, T> = object : ReadOnlyProperty<Fragment, T> {
     @Suppress("UNCHECKED_CAST")
     override fun getValue(thisRef: Fragment, property: KProperty<*>): T {
         (requireView().getTag(property.name.hashCode()) as? T)?.let { return it }

build.gradle

@@ -1,11 +1,11 @@
 buildscript {
-    ext.kotlin_version = '1.3.72'
+    ext.kotlin_version = '1.4.10'
     repositories {
         google()
         jcenter()
     }
     dependencies {
-        classpath 'com.android.tools.build:gradle:4.0.1'
+        classpath 'com.android.tools.build:gradle:4.1.0'
         classpath "org.jetbrains.kotlin:kotlin-gradle-plugin:$kotlin_version"
     }
 }

gradle/wrapper/gradle-wrapper.properties

@@ -1,6 +1,6 @@
-#Sat Apr 25 16:47:20 JST 2020
+#Mon Oct 26 09:43:16 JST 2020
 distributionBase=GRADLE_USER_HOME
 distributionPath=wrapper/dists
 zipStoreBase=GRADLE_USER_HOME
 zipStorePath=wrapper/dists
-distributionUrl=https\://services.gradle.org/distributions/gradle-6.3-all.zip
+distributionUrl=https\://services.gradle.org/distributions/gradle-6.5-all.zip

sample/build.gradle

@@ -3,11 +3,11 @@ apply plugin: 'kotlin-android'
 apply plugin: 'kotlin-kapt'
 
 android {
-    compileSdkVersion 29
+    compileSdkVersion 30
     defaultConfig {
         applicationId "com.wada811.viewbindingktx"
         minSdkVersion 15
-        targetSdkVersion 29
+        targetSdkVersion 30
         versionCode 1
         versionName "1.0"
         testInstrumentationRunner "androidx.test.runner.AndroidJUnitRunner"
@@ -16,7 +16,7 @@ android {
     buildTypes {
         debug {
             debuggable true
-            minifyEnabled false
+            minifyEnabled true
             proguardFiles getDefaultProguardFile('proguard-android-optimize.txt'), 'proguard-rules.pro'
         }
         release {
@@ -31,26 +31,6 @@ android {
 
 dependencies {
     implementation "org.jetbrains.kotlin:kotlin-stdlib-jdk7:$kotlin_version"
-    implementation 'androidx.appcompat:appcompat:1.1.0'
+    implementation 'androidx.appcompat:appcompat:1.2.0'
     implementation project(':ViewBinding-ktx')
-    implementation 'com.squareup.leakcanary:leakcanary-android:2.2'
-
-    // Core library
-    androidTestImplementation 'androidx.test:core:1.2.0'
-    // AndroidJUnitRunner and JUnit Rules
-    androidTestImplementation 'androidx.test:runner:1.2.0'
-    androidTestImplementation 'androidx.test:rules:1.2.0'
-    // Assertions
-    androidTestImplementation 'androidx.test.ext:junit:1.1.1'
-    androidTestImplementation 'androidx.test.ext:truth:1.2.0'
-    androidTestImplementation 'com.google.truth:truth:1.0'
-    // Espresso dependencies
-    androidTestImplementation 'androidx.test.espresso:espresso-core:3.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-contrib:3.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-intents:3.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-accessibility:3.2.0'
-    androidTestImplementation 'androidx.test.espresso:espresso-web:3.2.0'
-    androidTestImplementation 'androidx.test.espresso.idling:idling-concurrent:3.2.0'
-    // LeakCanary
-    androidTestImplementation "com.squareup.leakcanary:leakcanary-android-instrumentation:2.2"
 }