收藏数不能小于0

app/src/main/java/com/miekir/eden/ui/home/goods/detail/GoodsDetailActivity.java

@@ -170,6 +170,9 @@ public class GoodsDetailActivity extends BaseBeiActivity implements View.OnClick
             } else {
                 item.setTitle("  收藏  ");
                 mGoodsBean.favNum = mGoodsBean.favNum-1;
+                if (mGoodsBean.favNum < 0) {
+                    mGoodsBean.favNum = 0L;
+                }
             }
             tv_fav_num.setText(String.format(FORMATTER_FAV_NUM, mGoodsBean.favNum));
             setResult(RESULT_OK, getIntent().putExtra(KEY_GOODS, mGoodsBean));