check write permissions before starting the deletion

app/src/main/java/com/simplemobiletools/gallery/activities/MainActivity.java

@@ -196,6 +196,12 @@ public class MainActivity extends SimpleActivity
             }
         }
 
+        for (String path : mToBeDeleted) {
+            if (Utils.Companion.isShowingWritePermissions(this, new File(path))) {
+                return;
+            }
+        }
+
         notifyDeletion(deletedCnt);
     }
 

app/src/main/java/com/simplemobiletools/gallery/activities/MediaActivity.java

@@ -293,6 +293,9 @@ public class MediaActivity extends SimpleActivity
     }
 
     private void prepareForDeleting() {
+        if (Utils.Companion.isShowingWritePermissions(this, new File(mPath)))
+            return;
+
         Utils.Companion.showToast(this, R.string.deleting);
         final SparseBooleanArray items = mGridView.getCheckedItemPositions();
         final int cnt = items.size();

app/src/main/java/com/simplemobiletools/gallery/activities/ViewPagerActivity.java

@@ -242,8 +242,10 @@ public class ViewPagerActivity extends SimpleActivity
     }
 
     private void notifyDeletion() {
-        mToBeDeleted = getCurrentFile().getAbsolutePath();
+        if (Utils.Companion.isShowingWritePermissions(this, new File(mPath)))
+            return;
 
+        mToBeDeleted = getCurrentFile().getAbsolutePath();
         if (mMedia.size() <= 1) {
             deleteFile();
         } else {