修了一个bug

src/Notes-master/java/net/micode/notes/ui/NotesListActivity.java

@@ -172,6 +172,9 @@ public class NotesListActivity extends AppCompatActivity implements OnClickListe
         super.onCreate(savedInstanceState);
         setContentView(layout.note_list);
 
+        SharedPreferences sharedPreferences=getSharedPreferences("data1", Context.MODE_WORLD_READABLE);
+        if(!sharedPreferences.contains("DEFAULT"))
+        {
             Drawable drawable= getResources().getDrawable(list_background);
             BitmapDrawable bd = (BitmapDrawable) drawable;
             Bitmap b = bd.getBitmap();
@@ -182,6 +185,8 @@ public class NotesListActivity extends AppCompatActivity implements OnClickListe
                 os.close();
             } catch (Exception ignored) {
             }
+        }
+
 
         initResources();