implement a function to check if imageAdapter is null to avoid a crash due to UninitializedPropertyAccessException

Author: Moroi

FishBun/src/main/java/com/sangcomz/fishbun/Fishton.kt

@@ -6,13 +6,15 @@ import android.graphics.drawable.Drawable
 import android.net.Uri
 import com.sangcomz.fishbun.adapter.image.ImageAdapter
 import com.sangcomz.fishbun.util.getDimension
-import java.util.ArrayList
 
 /**
  * Created by seokwon.jeong on 04/01/2018.
  */
 object Fishton {
-    lateinit var imageAdapter: ImageAdapter
+    // System may destroy Activity due to system constraints
+    // such as configuration change or memory pressure.
+    // That's why this should be belonged to callsite's lifecycle.
+    var imageAdapter: ImageAdapter? = null
     var currentPickerImageList: List<Uri> = emptyList()
 
     //BaseParams

FishBun/src/main/java/com/sangcomz/fishbun/datasource/FishBunDataSource.kt

@@ -24,7 +24,7 @@ interface FishBunDataSource {
     fun getAllViewTitle(): String
     fun getDetailViewData(): DetailImageViewData
     fun getAlbumViewData(): AlbumViewData
-    fun getImageAdapter(): ImageAdapter
+    fun getImageAdapter(): ImageAdapter?
     fun gatAlbumMenuViewData(): AlbumMenuViewData
     fun getPickerViewData(): PickerViewData
     fun setCurrentPickerImageList(pickerImageList: List<Uri>)

FishBun/src/main/java/com/sangcomz/fishbun/ui/album/adapter/AlbumListAdapter.kt

@@ -32,7 +32,6 @@ class AlbumListAdapter(
     }
 
     override fun onCreateViewHolder(parent: ViewGroup, viewType: Int): ViewHolder {
-        val binding =
         return ViewHolder(
             parent,
             thumbnailSize,

FishBun/src/main/java/com/sangcomz/fishbun/ui/album/model/repository/AlbumRepository.kt

@@ -15,7 +15,7 @@ interface AlbumRepository {
 
     fun getAlbumViewData(): AlbumViewData
 
-    fun getImageAdapter(): ImageAdapter
+    fun getImageAdapter(): ImageAdapter?
 
     fun getSelectedImageList(): List<Uri>
 

FishBun/src/main/java/com/sangcomz/fishbun/ui/album/mvp/AlbumPresenter.kt

@@ -1,15 +1,13 @@
 package com.sangcomz.fishbun.ui.album.mvp
 
 import android.net.Uri
-import android.os.Environment
-import com.sangcomz.fishbun.ui.album.model.Album
-import com.sangcomz.fishbun.ui.album.model.repository.AlbumRepository
 import com.sangcomz.fishbun.ui.album.AlbumContract
+import com.sangcomz.fishbun.ui.album.model.Album
 import com.sangcomz.fishbun.ui.album.model.AlbumMenuViewData
+import com.sangcomz.fishbun.ui.album.model.repository.AlbumRepository
 import com.sangcomz.fishbun.util.UiHandler
 import com.sangcomz.fishbun.util.future.CallableFutureTask
 import com.sangcomz.fishbun.util.future.FutureCallback
-import java.util.ArrayList
 
 class AlbumPresenter(
     private val albumView: AlbumContract.View,
@@ -21,25 +19,11 @@ class AlbumPresenter(
 
     override fun loadAlbumList() {
         albumListFuture = albumRepository.getAlbumList()
-
-        albumListFuture?.let {
-            it.execute(object : FutureCallback<List<Album>> {
-                override fun onSuccess(result: List<Album>) {
-                    uiHandler.run {
-                        if (result.isNotEmpty()) {
-                            changeToolbarTitle()
-                            albumView.showAlbumList(
-                                it.get(),
-                                albumRepository.getImageAdapter(),
-                                albumRepository.getAlbumViewData()
-                            )
-                        } else {
-                            albumView.showEmptyView()
-                        }
-                    }
-                }
-            })
-        }
+        albumListFuture?.execute(object : FutureCallback<List<Album>> {
+            override fun onSuccess(result: List<Album>) {
+                handleResult(result)
+            }
+        })
     }
 
     override fun takePicture() {
@@ -111,6 +95,27 @@ class AlbumPresenter(
         albumView.scanAndRefresh()
     }
 
+    private fun handleResult(result: List<Album>) {
+        val adapter = albumRepository.getImageAdapter()
+        // imageAdapter is null, so we can not proceed anymore
+        if (adapter == null) {
+            finish()
+            return
+        }
+        uiHandler.run {
+            if (result.isNotEmpty()) {
+                changeToolbarTitle()
+                albumView.showAlbumList(
+                    result,
+                    adapter,
+                    albumRepository.getAlbumViewData()
+                )
+            } else {
+                albumView.showEmptyView()
+            }
+        }
+    }
+
     companion object {
         private const val defaultDir = "/Camera"
     }

FishBun/src/main/java/com/sangcomz/fishbun/ui/detail/model/DetailImageRepository.kt

@@ -10,7 +10,7 @@ interface DetailImageRepository {
     fun getImageIndex(imageUri: Uri): Int
     fun selectImage(imageUri: Uri)
     fun unselectImage(imageUri: Uri)
-    fun getImageAdapter(): ImageAdapter
+    fun getImageAdapter(): ImageAdapter?
     fun isFullSelected(): Boolean
     fun checkForFinish(): Boolean
     fun getMessageLimitReached(): String

FishBun/src/main/java/com/sangcomz/fishbun/ui/detail/mvp/DetailImagePresenter.kt

@@ -1,7 +1,6 @@
 package com.sangcomz.fishbun.ui.detail.mvp
 
 import android.net.Uri
-import androidx.annotation.VisibleForTesting
 import com.sangcomz.fishbun.ui.detail.DetailImageContract
 import com.sangcomz.fishbun.ui.detail.model.DetailImageRepository
 
@@ -66,7 +65,13 @@ class DetailImagePresenter(
     }
 
     private fun initViewPagerAdapter() {
-        detailView.initViewPagerAdapter(detailImageRepository.getImageAdapter())
+        val adapter = detailImageRepository.getImageAdapter()
+        // we can not proceed any more if imageAdapter is null
+        if (adapter == null) {
+            detailView.finishActivity()
+            return
+        }
+        detailView.initViewPagerAdapter(adapter)
     }
 
     private fun changeButtonStatusInternal(imageUri: Uri) {

FishBun/src/main/java/com/sangcomz/fishbun/ui/picker/PickerPresenter.kt

@@ -38,7 +38,7 @@ class PickerPresenter internal constructor(
             .also {
                 it.execute(object : FutureCallback<List<Uri>> {
                     override fun onSuccess(result: List<Uri>) {
-                        onSuccessAllMediaThumbnailsPath(result)
+                        handleResult(result)
                     }
                 })
             }
@@ -47,7 +47,10 @@ class PickerPresenter internal constructor(
     override fun transImageFinish() {
         val albumData = pickerRepository.getPickerAlbumData() ?: return
 
-        pickerView.takeANewPictureWithFinish(albumData.albumPosition, pickerRepository.getAddedPathList())
+        pickerView.takeANewPictureWithFinish(
+            albumData.albumPosition,
+            pickerRepository.getAddedPathList()
+        )
     }
 
     override fun takePicture() {
@@ -146,7 +149,7 @@ class PickerPresenter internal constructor(
     }
 
     override fun onSuccessTakePicture() {
-       pickerView.onSuccessTakePicture()
+        pickerView.onSuccessTakePicture()
     }
 
     override fun release() {
@@ -219,6 +222,7 @@ class PickerPresenter internal constructor(
     }
 
     private fun onSuccessAllMediaThumbnailsPath(imageUriList: List<Uri>) {
+        val adapter = requireNotNull(pickerRepository.getImageAdapter())
         pickerRepository.setCurrentPickerImageList(imageUriList)
 
         val viewData = pickerRepository.getPickerViewData()
@@ -227,15 +231,14 @@ class PickerPresenter internal constructor(
         if (pickerRepository.hasCameraInPickerPage()) {
             pickerList.add(PickerListItem.Camera)
         }
-
         imageUriList.map {
             PickerListItem.Image(it, selectedImageList.indexOf(it), viewData)
         }.also {
             pickerList.addAll(it)
             uiHandler.run {
                 pickerView.showImageList(
                     pickerList,
-                    pickerRepository.getImageAdapter(),
+                    adapter,
                     pickerRepository.hasCameraInPickerPage()
                 )
                 setToolbarTitle()
@@ -250,7 +253,7 @@ class PickerPresenter internal constructor(
             .also {
                 it.execute(object : FutureCallback<List<Uri>> {
                     override fun onSuccess(result: List<Uri>) {
-                        onSuccessAllMediaThumbnailsPath(result)
+                        handleResult(result)
                     }
                 })
             }
@@ -263,4 +266,13 @@ class PickerPresenter internal constructor(
             pickerView.finishActivity()
         }
     }
-}
+
+    private fun handleResult(result: List<Uri>) {
+        if (pickerRepository.getImageAdapter() != null) {
+            onSuccessAllMediaThumbnailsPath(result)
+        } else {
+            // imageAdapter is null, so we can not proceed anymore
+            finish()
+        }
+    }
+}

FishBun/src/main/java/com/sangcomz/fishbun/ui/picker/model/PickerRepository.kt

@@ -23,7 +23,7 @@ interface PickerRepository {
 
     fun getSelectedImageList(): List<Uri>
 
-    fun getImageAdapter(): ImageAdapter
+    fun getImageAdapter(): ImageAdapter?
 
     fun hasCameraInPickerPage(): Boolean
 

FishBun/src/main/java/com/sangcomz/fishbun/ui/picker/model/PickerRepositoryImpl.kt

@@ -59,7 +59,7 @@ class PickerRepositoryImpl(
 
     override fun getSelectedImageList() = fishBunDataSource.getSelectedImageList()
 
-    override fun getImageAdapter(): ImageAdapter = fishBunDataSource.getImageAdapter()
+    override fun getImageAdapter(): ImageAdapter? = fishBunDataSource.getImageAdapter()
 
     override fun hasCameraInPickerPage(): Boolean {
         return when {