keima · March 31, 2024 21:58 · Oct 23, 2019 · Apr 10, 2018
diff --git a/HowToUseActivity.kt b/HowToUseActivity.kt
@@ -0,0 +1,75 @@
+import android.os.Bundle
+import android.util.Log
+import android.view.ViewGroup
+import android.widget.TextView
+import androidx.appcompat.app.AppCompatActivity
+import androidx.databinding.DataBindingUtil
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleObserver
+import androidx.lifecycle.OnLifecycleEvent
+import app.keima.android.recyclerviewsandbox.databinding.ActivityMainBinding
+
+class MainActivity : AppCompatActivity() {
+
+    private lateinit var binding: ActivityMainBinding
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        binding = DataBindingUtil.setContentView(this, R.layout.activity_main)
+
+        binding.recyclerView.apply {
+            adapter = MyAdapter(
+                arrayOf(
+                    "A", "B", "C", "D",
+                    "A", "B", "C", "D",
+                    "A", "B", "C", "D",
+                    "A", "B", "C", "D"
+                )
+            )
+        }
+    }
+}
+
+class MyAdapter(private val dataset: Array<String>) :
+    LifecycleRecyclerAdapter<MyAdapter.MyViewHolder>() {
+
+    class MyViewHolder(private val textView: TextView) : LifecycleViewHolder(textView) {
+        private val observer = MyObserver()
+
+        init {
+            lifecycle.addObserver(observer)
+        }
+
+        fun bindData(data: String) {
+            textView.text = data
+            observer.data = data
+        }
+    }
+
+    class MyObserver() : LifecycleObserver {
+        var data: String = "?"
+
+        @OnLifecycleEvent(Lifecycle.Event.ON_CREATE)
+        fun onCreate() {
+            Log.d("MyObserver", "appear: $data")
+        }
+
+        @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
+        fun onDestroy() {
+            Log.d("MyObserver", "disappear: $data")
+        }
+    }
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): MyViewHolder {
+        return MyViewHolder(TextView(parent.context).apply {
+            setPadding(8, 40, 8, 40)
+        })
+    }
+
+    override fun onBindViewHolder(holder: MyViewHolder, position: Int) {
+        holder.bindData("${dataset[position]} $position")
+    }
+
+    override fun getItemCount() = dataset.size
+
+}
diff --git a/Licenses.md b/Licenses.md
@@ -0,0 +1 @@
+This gist snippet is [Public Domain](https://wiki.creativecommons.org/wiki/Public_domain).
diff --git a/LifecycleRecyclerAdapter.kt b/LifecycleRecyclerAdapter.kt
@@ -1,4 +1,4 @@
-import android.support.v7.widget.RecyclerView
+import androidx.recyclerview.widget.RecyclerView
 
 abstract class LifecycleRecyclerAdapter<T : LifecycleViewHolder> : RecyclerView.Adapter<T>() {
 

diff --git a/LifecycleViewHolder.kt b/LifecycleViewHolder.kt
@@ -1,28 +1,28 @@
-import android.arch.lifecycle.Lifecycle
-import android.arch.lifecycle.LifecycleOwner
-import android.arch.lifecycle.LifecycleRegistry
-import android.support.v7.widget.RecyclerView
 import android.view.View
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleOwner
+import androidx.lifecycle.LifecycleRegistry
+import androidx.recyclerview.widget.RecyclerView
 
-abstract class LifecycleViewHolder(itemView: View) : RecyclerView.ViewHolder(
-    itemView), LifecycleOwner {
+abstract class LifecycleViewHolder(itemView: View) :
+    RecyclerView.ViewHolder(itemView), LifecycleOwner {
 
-  private val lifecycleRegistry = LifecycleRegistry(this)
+    private val lifecycleRegistry = LifecycleRegistry(this)
 
-  init {
-    lifecycleRegistry.markState(Lifecycle.State.INITIALIZED)
-  }
+    init {
+        lifecycleRegistry.currentState = Lifecycle.State.INITIALIZED
+    }
 
-  fun onAppear() {
-    lifecycleRegistry.markState(Lifecycle.State.CREATED)
-  }
+    fun onAppear() {
+        lifecycleRegistry.currentState = Lifecycle.State.CREATED
+    }
 
-  fun onDisappear() {
-    lifecycleRegistry.markState(Lifecycle.State.DESTROYED)
-  }
+    fun onDisappear() {
+        lifecycleRegistry.currentState = Lifecycle.State.DESTROYED
+    }
 
-  override fun getLifecycle(): Lifecycle {
-    return lifecycleRegistry
-  }
+    override fun getLifecycle(): Lifecycle {
+        return lifecycleRegistry
+    }
 
 }
diff --git a/LifecycleRecyclerAdapter.kt b/LifecycleRecyclerAdapter.kt
@@ -0,0 +1,15 @@
+import android.support.v7.widget.RecyclerView
+
+abstract class LifecycleRecyclerAdapter<T : LifecycleViewHolder> : RecyclerView.Adapter<T>() {
+
+  override fun onViewAttachedToWindow(holder: T) {
+    super.onViewAttachedToWindow(holder)
+    holder.onAppear()
+  }
+
+  override fun onViewDetachedFromWindow(holder: T) {
+    super.onViewDetachedFromWindow(holder)
+    holder.onDisappear()
+  }
+
+}
diff --git a/LifecycleViewHolder.kt b/LifecycleViewHolder.kt
@@ -0,0 +1,28 @@
+import android.arch.lifecycle.Lifecycle
+import android.arch.lifecycle.LifecycleOwner
+import android.arch.lifecycle.LifecycleRegistry
+import android.support.v7.widget.RecyclerView
+import android.view.View
+
+abstract class LifecycleViewHolder(itemView: View) : RecyclerView.ViewHolder(
+    itemView), LifecycleOwner {
+
+  private val lifecycleRegistry = LifecycleRegistry(this)
+
+  init {
+    lifecycleRegistry.markState(Lifecycle.State.INITIALIZED)
+  }
+
+  fun onAppear() {
+    lifecycleRegistry.markState(Lifecycle.State.CREATED)
+  }
+
+  fun onDisappear() {
+    lifecycleRegistry.markState(Lifecycle.State.DESTROYED)
+  }
+
+  override fun getLifecycle(): Lifecycle {
+    return lifecycleRegistry
+  }
+
+}
Original file line number	Diff line number	Diff line change
		@@ -0,0 +1 @@
		This gist snippet is [Public Domain](https://wiki.creativecommons.org/wiki/Public_domain).
No results found