diff --git a/project/java/DataDownloader.java b/project/java/DataDownloader.java
index d70834ccf..e5ddf398f 100644
--- a/project/java/DataDownloader.java
+++ b/project/java/DataDownloader.java
@@ -57,6 +57,8 @@ import android.content.Context;
 import android.content.res.Resources;
 import java.lang.String;
 import android.text.SpannedString;
+import android.app.AlertDialog;
+import android.content.DialogInterface;
 
 
 class CountingInputStream extends BufferedInputStream
@@ -188,6 +190,7 @@ class DataDownloader extends Thread
 	@Override
 	public void run()
 	{
+		Parent.keyListener = new BackKeyListener(Parent);
 		String [] downloadFiles = Globals.DataDownloadUrl;
 		int total = 0;
 		int count = 0;
@@ -213,11 +216,13 @@ class DataDownloader extends Thread
 			}
 		}
 		DownloadComplete = true;
+		Parent.keyListener = null;
 		initParent();
 	}
 
 	public boolean DownloadDataFile(final String DataDownloadUrl, final String DownloadFlagFileName, int downloadCount, int downloadTotal, int downloadIndex)
 	{
+		DownloadCanBeResumed = false;
 		Resources res = Parent.getResources();
 
 		String [] downloadUrls = DataDownloadUrl.split("[|]");
@@ -298,6 +303,7 @@ class DataDownloader extends Thread
 				path = getOutFilePath(url.substring( 1, url.indexOf(":", 1) ));
 				url = url.substring( url.indexOf(":", 1) + 1 );
 				DoNotUnzip = true;
+				DownloadCanBeResumed = true;
 				File partialDownload = new File( path );
 				if( partialDownload.exists() && !partialDownload.isDirectory() && !forceOverwrite )
 					partialDownloadLen = partialDownload.length();
@@ -674,10 +680,56 @@ class DataDownloader extends Thread
         return http;
 		*/
 	}
-	
+
+
+	public class BackKeyListener implements Settings.KeyEventsListener
+	{
+		MainActivity p;
+		public BackKeyListener(MainActivity _p)
+		{
+			p = _p;
+		}
+
+		public void onKeyEvent(final int keyCode)
+		{
+			if( DownloadFailed )
+				System.exit(1);
+
+			AlertDialog.Builder builder = new AlertDialog.Builder(p);
+			builder.setTitle(p.getResources().getString(R.string.cancel_download));
+			builder.setMessage(p.getResources().getString(R.string.cancel_download) + (DownloadCanBeResumed ? " " + p.getResources().getString(R.string.cancel_download_resume) : ""));
+			
+			builder.setPositiveButton(p.getResources().getString(R.string.yes), new DialogInterface.OnClickListener()
+			{
+				public void onClick(DialogInterface dialog, int item) 
+				{
+					System.exit(1);
+					dialog.dismiss();
+				}
+			});
+			builder.setNegativeButton(p.getResources().getString(R.string.no), new DialogInterface.OnClickListener()
+			{
+				public void onClick(DialogInterface dialog, int item) 
+				{
+					dialog.dismiss();
+				}
+			});
+			builder.setOnCancelListener(new DialogInterface.OnCancelListener()
+			{
+				public void onCancel(DialogInterface dialog)
+				{
+				}
+			});
+			AlertDialog alert = builder.create();
+			alert.setOwnerActivity(p);
+			alert.show();
+		}
+	}
+
 	public StatusWriter Status;
 	public boolean DownloadComplete = false;
 	public boolean DownloadFailed = false;
+	public boolean DownloadCanBeResumed = false;
 	private MainActivity Parent;
 	private String outFilesDir = null;
 }
diff --git a/project/java/MainActivity.java b/project/java/MainActivity.java
index 98944c18b..6f1820709 100644
--- a/project/java/MainActivity.java
+++ b/project/java/MainActivity.java
@@ -623,6 +623,7 @@ public class MainActivity extends Activity
 			if( mGLView.nativeKey( keyCode, 1 ) == 0 )
 				return super.onKeyDown(keyCode, event);
 		}
+		/*
 		else
 		if( keyCode == KeyEvent.KEYCODE_BACK && downloader != null )
 		{
@@ -631,6 +632,7 @@ public class MainActivity extends Activity
 			if( !downloader.DownloadComplete )
 				onStop();
 		}
+		*/
 		else
 		if( keyListener != null )
 		{
diff --git a/project/java/translations/values-fr/strings.xml b/project/java/translations/values-fr/strings.xml
index 1df365962..3224cc78a 100644
--- a/project/java/translations/values-fr/strings.xml
+++ b/project/java/translations/values-fr/strings.xml
@@ -171,4 +171,8 @@
 <string name="cancel">Cancel</string>
 <string name="calibrate_gyroscope_not_supported">Your device does not have gyroscope</string>
 <string name="reset_config_ask">Reset all options to default values?</string>
+<string name="cancel_download">Cancel data downloading?</string>
+<string name="cancel_download_resume">You can resume it later, the data will not be downloaded twice.</string>
+<string name="yes">Yes</string>
+<string name="no">No</string>
 </resources>
diff --git a/project/java/translations/values-ru/strings.xml b/project/java/translations/values-ru/strings.xml
index 3f73b71cc..c10d240e4 100644
--- a/project/java/translations/values-ru/strings.xml
+++ b/project/java/translations/values-ru/strings.xml
@@ -143,4 +143,8 @@
 <string name="cancel">Отменить</string>
 <string name="calibrate_gyroscope_not_supported">Гироскоп отсутствует</string>
 <string name="reset_config_ask">Сбросить все настройки в значения по умолчанию?</string>
+<string name="cancel_download">Остановить загрузку?</string>
+<string name="cancel_download_resume">Загрузка может быть продолжена позднее.</string>
+<string name="yes">Да</string>
+<string name="no">Нет</string>
 </resources>
diff --git a/project/java/translations/values-uk/strings.xml b/project/java/translations/values-uk/strings.xml
index 9a549d1fe..11b168d89 100644
--- a/project/java/translations/values-uk/strings.xml
+++ b/project/java/translations/values-uk/strings.xml
@@ -142,4 +142,8 @@
 <string name="cancel">Cancel</string>
 <string name="calibrate_gyroscope_not_supported">Your device does not have gyroscope</string>
 <string name="reset_config_ask">Reset all options to default values?</string>
+<string name="cancel_download">Cancel data downloading?</string>
+<string name="cancel_download_resume">You can resume it later, the data will not be downloaded twice.</string>
+<string name="yes">Yes</string>
+<string name="no">No</string>
 </resources>
diff --git a/project/java/translations/values/strings.xml b/project/java/translations/values/strings.xml
index f15e9192d..c8bc65289 100644
--- a/project/java/translations/values/strings.xml
+++ b/project/java/translations/values/strings.xml
@@ -173,4 +173,9 @@
     <string name="reset_config">Reset config to defaults</string>
     <string name="reset_config_ask">Reset all options to default values?</string>
 
+    <string name="cancel_download">Cancel data downloading?</string>
+    <string name="cancel_download_resume">You can resume it later, the data will not be downloaded twice.</string>
+    <string name="yes">Yes</string>
+    <string name="no">No</string>
+
 </resources>
diff --git a/todo.txt b/todo.txt
index a821162d9..6ee3b5c22 100644
--- a/todo.txt
+++ b/todo.txt
@@ -5,8 +5,6 @@ Requested features (see also bugs.txt)
 
 - Redesign on-screen keyboard layout dialog.
 
-- Option to reset SDL config to default.
-
 - Option for default on-screen key theme in AndroidAppSettings.cfg.
 
 - Select between normal mouse input and magnifying glass/relative input automatically, based on screen size.