[ Team2 (Jay&Stitch) ] recyclerview 클릭 이벤트 + MVVM 패턴 적용

app/build.gradle

@@ -33,6 +33,7 @@ android {
 
 dependencies {
     implementation 'org.jetbrains.kotlinx:kotlinx-coroutines-android:1.5.2'
+    implementation 'androidx.fragment:fragment-ktx:1.4.1'
     implementation 'androidx.core:core-ktx:1.7.0'
     implementation 'androidx.appcompat:appcompat:1.4.1'
     implementation 'com.google.android.material:material:1.5.0'

app/src/main/AndroidManifest.xml

@@ -13,10 +13,10 @@
         android:supportsRtl="true"
         android:theme="@style/Theme.Kotlinphotos">
         <activity
-            android:name=".photos.DoodleActivity"
+            android:name=".ui.doodle.DoodleActivity"
             android:exported="false" />
         <activity
-            android:name=".photos.PhotoActivity"
+            android:name=".ui.photo.MainActivity"
             android:exported="true">
             <intent-filter>
                 <action android:name="android.intent.action.MAIN" />
@@ -25,10 +25,10 @@
             </intent-filter>
         </activity>
         <activity
-            android:name=".previous.SecondActivity"
+            android:name=".permission.SecondActivity"
             android:exported="true" />
         <activity
-            android:name=".previous.MainActivity"
+            android:name=".permission.MainActivity"
             android:exported="false" />
     </application>
 

app/src/main/java/com/example/kotlinphotos/photos/AssetLoader.kt → app/src/main/java/com/example/kotlinphotos/AssetLoader.kt

@@ -1,12 +1,10 @@
-package com.example.kotlinphotos.photos
+package com.example.kotlinphotos
 
 import android.content.Context
-import java.lang.Exception
-import java.lang.NullPointerException
 
-object AssetLoader {
+class AssetLoader(private val context: Context) {
 
-    private fun loadAsset(context: Context, fileName: String): String {
+    private fun loadAsset(fileName: String): String {
         return context.assets.open(fileName).use { inputStream ->
             val size = inputStream.available()
             val byteArray = ByteArray(size)
@@ -15,9 +13,9 @@ object AssetLoader {
         }
     }
 
-    fun jsonToString(context: Context, fileName: String): String? {
+    fun jsonToString(fileName: String): String? {
         return kotlin.runCatching {
-            loadAsset(context, fileName)
+            loadAsset(fileName)
         }.getOrNull()
     }
 }

app/src/main/java/com/example/kotlinphotos/model/Photo.kt

@@ -0,0 +1,17 @@
+package com.example.kotlinphotos.model
+
+import android.graphics.Bitmap
+import com.example.kotlinphotos.model.Type.*
+
+data class Photo(
+    val tittle: String,
+    val bitmap: Bitmap?,
+    val date: String,
+    var isChecked: Boolean = false,
+    var mode: Type = READ
+)
+
+enum class Type(val mode: Int) {
+    READ(1),
+    EDIT(2)
+}

app/src/main/java/com/example/kotlinphotos/previous/SecondActivity.kt → app/src/main/java/com/example/kotlinphotos/permission/SecondActivity.kt

@@ -1,4 +1,4 @@
-package com.example.kotlinphotos.previous
+package com.example.kotlinphotos.permission
 
 import android.Manifest
 import android.content.Intent

app/src/main/java/com/example/kotlinphotos/repository/DoodleAssetDataSource.kt

@@ -0,0 +1,46 @@
+package com.example.kotlinphotos.repository
+
+import android.graphics.Bitmap
+import android.graphics.BitmapFactory
+import com.example.kotlinphotos.AssetLoader
+import com.example.kotlinphotos.model.Photo
+import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.withContext
+import org.json.JSONArray
+import java.net.URL
+
+class DoodleAssetDataSource(
+    private val assetLoader: AssetLoader
+) : DoodleDataSource {
+
+    override suspend fun getDoodleData(): List<Photo> {
+        val photos = mutableListOf<Photo>()
+        val str = assetLoader.jsonToString(DOODLE_FILE_NAME)
+        val jsonArray = JSONArray(str)
+
+        val size = jsonArray.length()
+        repeat(size) {
+            val json = jsonArray.getJSONObject(it)
+            val title = json.getString("title")
+            val image = json.getString("image")
+            val date = json.getString("date")
+            val bitmap = loadImage(image)
+            photos.add(Photo(title, bitmap, date))
+        }
+        return photos
+    }
+
+    private suspend fun loadImage(imageUrl: String): Bitmap? {
+        return withContext(Dispatchers.IO) {
+            kotlin.runCatching {
+                val url = URL(imageUrl)
+                val stream = url.openStream()
+                BitmapFactory.decodeStream(stream)
+            }.getOrNull()
+        }
+    }
+
+    companion object {
+        const val DOODLE_FILE_NAME = "doodle.json"
+    }
+}

app/src/main/java/com/example/kotlinphotos/repository/DoodleDataSource.kt

@@ -0,0 +1,8 @@
+package com.example.kotlinphotos.repository
+
+import com.example.kotlinphotos.model.Photo
+
+interface DoodleDataSource {
+
+    suspend fun getDoodleData(): List<Photo>
+}

app/src/main/java/com/example/kotlinphotos/repository/DoodleRepository.kt

@@ -0,0 +1,11 @@
+package com.example.kotlinphotos.repository
+
+import com.example.kotlinphotos.model.Photo
+
+class DoodleRepository(
+    private val doodleAssetDataSource: DoodleAssetDataSource
+) {
+    suspend fun loadDoodlePhotos(): List<Photo> {
+        return doodleAssetDataSource.getDoodleData()
+    }
+}

app/src/main/java/com/example/kotlinphotos/photos/PhotosDiffCallback.kt → app/src/main/java/com/example/kotlinphotos/ui/common/PhotosDiffCallback.kt

@@ -1,6 +1,7 @@
-package com.example.kotlinphotos.photos
+package com.example.kotlinphotos.ui.common
 
 import androidx.recyclerview.widget.DiffUtil
+import com.example.kotlinphotos.model.Photo
 
 
 class PhotosDiffCallback : DiffUtil.ItemCallback<Photo>() {

app/src/main/java/com/example/kotlinphotos/ui/doodle/DoodleActivity.kt

@@ -0,0 +1,38 @@
+package com.example.kotlinphotos.ui.doodle
+
+import androidx.appcompat.app.AppCompatActivity
+import android.os.Bundle
+import android.view.View
+import android.widget.ImageButton
+import androidx.activity.viewModels
+import androidx.recyclerview.widget.GridLayoutManager
+import androidx.recyclerview.widget.RecyclerView
+import com.example.kotlinphotos.R
+import com.example.kotlinphotos.ui.common.PhotosDiffCallback
+
+class DoodleActivity : AppCompatActivity() {
+    private lateinit var backButton: ImageButton
+    private lateinit var recyclerView: RecyclerView
+    private lateinit var saveImageButton: ImageButton
+    private val viewModel: DoodleViewModel by viewModels { DoodleViewModelFactory(this) }
+
+    override fun onCreate(savedInstanceState: Bundle?) {
+        super.onCreate(savedInstanceState)
+        setContentView(R.layout.activity_doodle)
+
+        backButton = findViewById(R.id.image_button_back)
+        recyclerView = findViewById(R.id.recyclerview_doodle)
+        saveImageButton = findViewById(R.id.image_button_save)
+
+        backButton.setOnClickListener { finish() }
+
+        val doodleAdapter = DoodleAdapter(PhotosDiffCallback(), object : OnSaveListener {
+            override fun showSaveButton() {
+                saveImageButton.visibility = View.VISIBLE
+            }
+        })
+        recyclerView.adapter = doodleAdapter
+        recyclerView.layoutManager = GridLayoutManager(this, 3)
+        viewModel.photos.observe(this) { doodleAdapter.submitList(it) }
+    }
+}

app/src/main/java/com/example/kotlinphotos/ui/doodle/DoodleAdapter.kt

@@ -0,0 +1,61 @@
+package com.example.kotlinphotos.ui.doodle
+
+import android.view.LayoutInflater
+import android.view.View
+import android.view.ViewGroup
+import android.widget.CheckBox
+import android.widget.ImageView
+import androidx.recyclerview.widget.DiffUtil
+import androidx.recyclerview.widget.ListAdapter
+import androidx.recyclerview.widget.RecyclerView
+import com.example.kotlinphotos.R
+import com.example.kotlinphotos.model.Photo
+import com.example.kotlinphotos.model.Type.*
+
+class DoodleAdapter(
+    diffCallback: DiffUtil.ItemCallback<Photo>,
+    private val saveListener: OnSaveListener
+) : ListAdapter<Photo, DoodleAdapter.DoodleViewHolder>(diffCallback) {
+
+    override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): DoodleViewHolder {
+        return DoodleViewHolder(
+            LayoutInflater.from(parent.context).inflate(R.layout.item, parent, false)
+        )
+    }
+
+    override fun onBindViewHolder(holder: DoodleViewHolder, position: Int) {
+        val photo = getItem(position)
+        holder.bind(getItem(position))
+
+        holder.itemView.setOnLongClickListener {
+            for (current in currentList) {
+                current.mode = EDIT
+            }
+            false
+        }
+        holder.itemView.setOnClickListener {
+            if (photo.mode == EDIT) {
+                currentList[position].isChecked = true
+                saveListener.showSaveButton()
+                notifyDataSetChanged()
+            }
+        }
+    }
+
+    inner class DoodleViewHolder(view: View) : RecyclerView.ViewHolder(view) {
+
+        private val photoImageView = view.findViewById<ImageView>(R.id.view_photo)
+        private val photoCheckBox = view.findViewById<CheckBox>(R.id.checkbox_select)
+
+        fun bind(photo: Photo) {
+            when (photo.mode) {
+                EDIT -> photoCheckBox.visibility = View.VISIBLE
+                READ -> photoCheckBox.visibility = View.INVISIBLE
+            }
+            photoCheckBox.setOnCheckedChangeListener(null)
+            photoCheckBox.isChecked = photo.isChecked
+            photoCheckBox.setOnCheckedChangeListener { _, value -> photo.isChecked = value }
+            photoImageView.setImageBitmap(photo.bitmap)
+        }
+    }
+}