Replace getExternalStorageDirectory function call with getExternalFilesDir call since the first one is deprecated in API level 29.

Author: Legend1991

android/src/main/java/com/rssignaturecapture/RSSignatureCaptureMainView.java

@@ -19,7 +19,6 @@
 import android.content.Context;
 import android.graphics.Bitmap;
 import android.graphics.Color;
-import android.os.Environment;
 import android.view.View;
 import android.view.View.OnClickListener;
 import android.widget.Button;
@@ -138,11 +137,8 @@ else if (tag.equalsIgnoreCase("Reset")) {
    * save the signature to an sd card directory
    */
   final void saveImage() {
-
-    String root = Environment.getExternalStorageDirectory().toString();
-
     // the directory where the signature will be saved
-    File myDir = new File(root + "/saved_signature");
+    File myDir = getContext().getExternalFilesDir("/saved_signature");
 
     // make the directory if it does not exist yet
     if (!myDir.exists()) {