diff --git a/app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenter.java b/app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenter.java
deleted file mode 100644
index 010f6a8..0000000
--- a/app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenter.java
+++ /dev/null
@@ -1,42 +0,0 @@
-package com.wbrawner.simplemarkdown.presentation;
-
-import android.content.Context;
-import android.net.Uri;
-
-import com.wbrawner.simplemarkdown.view.MarkdownEditView;
-import com.wbrawner.simplemarkdown.view.MarkdownPreviewView;
-
-import java.io.InputStream;
-import java.io.OutputStream;
-
-public interface MarkdownPresenter {
-    void loadMarkdown(String fileName, InputStream in);
-    void loadFromUri(Context context, Uri fileUri);
-
-    void loadMarkdown(String fileName, InputStream in, FileLoadedListener listener,
-                      boolean replaceCurrentFile);
-
-    void newFile(String newName);
-    void setEditView(MarkdownEditView editView);
-    void setPreviewView(MarkdownPreviewView previewView);
-
-    void saveMarkdown(MarkdownSavedListener listener, String name, OutputStream outputStream);
-    void onMarkdownEdited();
-    void onMarkdownEdited(String markdown);
-    String getFileName();
-    void setFileName(String name);
-    String generateHTML();
-    String generateHTML(String markdown);
-    String getMarkdown();
-    void setMarkdown(String markdown);
-
-    interface FileLoadedListener {
-        void onSuccess(String markdown);
-
-        void onError();
-    }
-
-    interface MarkdownSavedListener {
-        void saveComplete(boolean success);
-    }
-}
diff --git a/app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenter.kt b/app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenter.kt
new file mode 100644
index 0000000..0cffc0a
--- /dev/null
+++ b/app/src/main/java/com/wbrawner/simplemarkdown/presentation/MarkdownPresenter.kt
@@ -0,0 +1,40 @@
+package com.wbrawner.simplemarkdown.presentation
+
+import android.content.Context
+import android.net.Uri
+
+import com.wbrawner.simplemarkdown.view.MarkdownEditView
+import com.wbrawner.simplemarkdown.view.MarkdownPreviewView
+
+import java.io.InputStream
+import java.io.OutputStream
+
+interface MarkdownPresenter {
+    var fileName: String
+    var markdown: String
+    fun loadMarkdown(fileName: String, `in`: InputStream)
+    fun loadFromUri(context: Context, fileUri: Uri)
+
+    fun loadMarkdown(fileName: String, `in`: InputStream, listener: FileLoadedListener,
+                     replaceCurrentFile: Boolean)
+
+    fun newFile(newName: String)
+    fun setEditView(editView: MarkdownEditView)
+    fun setPreviewView(previewView: MarkdownPreviewView)
+
+    fun saveMarkdown(listener: MarkdownSavedListener, name: String, outputStream: OutputStream)
+    fun onMarkdownEdited()
+    fun onMarkdownEdited(markdown: String)
+    fun generateHTML(): String
+    fun generateHTML(markdown: String): String
+
+    interface FileLoadedListener {
+        fun onSuccess(markdown: String)
+
+        fun onError()
+    }
+
+    interface MarkdownSavedListener {
+        fun saveComplete(success: Boolean)
+    }
+}