Rewrote IOHandler to Kotlin

app/src/main/java/eu/kanade/tachiyomi/data/io/IOHandler.java

@@ -1,45 +0,0 @@
-package eu.kanade.tachiyomi.data.io;
-
-import android.content.Context;
-
-import java.io.File;
-import java.io.FileInputStream;
-import java.io.FileOutputStream;
-import java.io.IOException;
-
-public class IOHandler {
-    private static String getTempFilename(Context context) throws IOException {
-        File outputDir = context.getCacheDir();
-        File outputFile = File.createTempFile("temp_cover", "0", outputDir);
-        return outputFile.getAbsolutePath();
-    }
-
-    public static String downloadMediaAndReturnPath(FileInputStream input, Context context) {
-        FileOutputStream output = null;
-        try {
-
-            String tempFilename = getTempFilename(context);
-            output = new FileOutputStream(tempFilename);
-
-            int read;
-            byte[] bytes = new byte[4096];
-            while ((read = input.read(bytes)) != -1) {
-                output.write(bytes, 0, read);
-            }
-            return tempFilename;
-        } catch (IOException ignored) {
-        } finally {
-            if (input != null) try {
-                input.close();
-            } catch (Exception ignored) {
-            }
-            if (output != null) try {
-                output.close();
-            } catch (Exception ignored) {
-            }
-        }
-        return null;
-
-    }
-
-}

app/src/main/java/eu/kanade/tachiyomi/data/io/IOHandler.kt

@@ -0,0 +1,62 @@
+@file:JvmName("IOHandler")
+package eu.kanade.tachiyomi.data.io
+
+import android.content.Context
+import eu.kanade.tachiyomi.R
+import eu.kanade.tachiyomi.util.ToastUtil
+import java.io.File
+import java.io.FileInputStream
+import java.io.FileOutputStream
+import java.io.IOException
+
+/**
+     * Returns temp file location
+     *
+     * @param context context of application
+ * @throws IOException IO exception
+     * @return location of temp file
+     */
+    @Throws(IOException::class)
+    private fun getTempFilename(context: Context): String {
+        // Get output directory.
+        val outputDir = context.cacheDir
+
+        // Create temporary file
+        val outputFile = File.createTempFile("temp_cover", "0", outputDir)
+
+        // Return path of temporary file
+        return outputFile.absolutePath
+    }
+
+    /**
+     * Download media to temp location and returns file path
+     *
+     * @param input input stream containing input file
+     * @param context context of application
+     * @throws IOException IO exception
+     * @return location of temp file
+     */
+    @Throws(IOException::class)
+    fun downloadMediaAndReturnPath(input: FileInputStream, context: Context): String {
+        var tempFilename = ""
+        var output: FileOutputStream? = null
+        try {
+            // Get temp file name.
+            tempFilename = getTempFilename(context)
+
+            output = FileOutputStream(tempFilename)
+            // Copy input stream to temp location.
+            input.copyTo(output)
+        } catch (e: IOException) {
+            // Show user something went wrong and print stackTrace.
+            ToastUtil.showShort(context, R.string.notification_manga_update_failed)
+            e.printStackTrace()
+        } finally {
+            // Close streams.
+            input.close()
+            output?.close()
+        }
+
+        // Return temp name.
+        return tempFilename
+    }

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryFragment.kt

@@ -14,7 +14,6 @@ import eu.davidea.flexibleadapter.FlexibleAdapter
 import eu.kanade.tachiyomi.R
 import eu.kanade.tachiyomi.data.database.models.Category
 import eu.kanade.tachiyomi.data.database.models.Manga
-import eu.kanade.tachiyomi.data.io.IOHandler
 import eu.kanade.tachiyomi.data.library.LibraryUpdateService
 import eu.kanade.tachiyomi.event.LibraryMangasEvent
 import eu.kanade.tachiyomi.ui.base.fragment.BaseRxFragment
@@ -311,17 +310,18 @@ class LibraryFragment : BaseRxFragment<LibraryPresenter>(), ActionMode.Callback
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent) {
         if (resultCode == Activity.RESULT_OK && requestCode == REQUEST_IMAGE_OPEN) {
             selectedCoverManga?.let { manga ->
+
+                try {
                 // Get the file's input stream from the incoming Intent
                 val inputStream = context.contentResolver.openInputStream(data.data)
 
                 // Convert to absolute path to prevent FileNotFoundException
-                val result = IOHandler.downloadMediaAndReturnPath(inputStream as FileInputStream,
+                    val result = eu.kanade.tachiyomi.data.io.downloadMediaAndReturnPath(inputStream as FileInputStream,
                         context)
 
                 // Get file from filepath
-                val picture = File(result ?: "")
+                val picture = File(result)
 
-                try {
                     // Update cover to selected file, show error if something went wrong
                     if (presenter.editCoverWithLocalFile(picture, manga)) {
                         adapter.refreshRegisteredAdapters()
@@ -330,6 +330,7 @@ class LibraryFragment : BaseRxFragment<LibraryPresenter>(), ActionMode.Callback
                     }
 
                 } catch (e: IOException) {
+                    ToastUtil.showShort(context, R.string.notification_manga_update_failed)
                     e.printStackTrace()
                 }
             }