1、修改SearchAppBar

lib/widget/search_app_bar.dart

@@ -49,65 +49,62 @@ class _SearchAppBarState extends State<SearchAppBar> {
         titleSpacing: 0.0,
         primary: widget.primary,
         leading: widget.leading,
-        title: Container(
-          color: Colors.blue,
-          child: Row(
-            children: <Widget>[
-              Expanded(
-                child: Container(
-                  decoration: BoxDecoration(
-                    borderRadius: const BorderRadius.all(Radius.circular(20.0)),
-                    color:
-                        widget.searchBackgroundColor ?? const Color(0xFFEEEEEE),
-                  ),
-                  child: Row(
-                    children: <Widget>[
-                      hGap10,
-                      Icon(Icons.search, color: Colors.grey.shade300),
-                      hGap5,
-                      Expanded(
-                        child: TextField(
-                          maxLines: 1,
-                          focusNode: searchFocusNode,
-                          style: TextStyle(
-                              fontSize: 14,
-                              color: widget.inputTextColor ??
-                                  const Color(0xFF000000)),
-                          textInputAction: TextInputAction.search,
-                          controller: searchInfoController,
-                          onSubmitted: (value) => _search(),
-                          decoration: InputDecoration(
-                            contentPadding: const EdgeInsets.symmetric(
-                                horizontal: 0.0, vertical: 8.0),
-                            isDense: true,
-                            counterText: "",
-                            hintText: widget.hintText,
-                            hintStyle: TextStyle(
-                                fontSize: 14.0,
-                                color: widget.hintTextColor ??
-                                    const Color(0xFF999999)),
-                            border: InputBorder.none, //去掉下划线
-                            //hintStyle: TextStyles.textGrayC14
-                          ),
+        title: Row(
+          children: <Widget>[
+            Expanded(
+              child: Container(
+                decoration: BoxDecoration(
+                  borderRadius: const BorderRadius.all(Radius.circular(20.0)),
+                  color:
+                      widget.searchBackgroundColor ?? const Color(0xFFEEEEEE),
+                ),
+                child: Row(
+                  children: <Widget>[
+                    hGap10,
+                    Icon(Icons.search, color: Colors.grey.shade300),
+                    hGap5,
+                    Expanded(
+                      child: TextField(
+                        maxLines: 1,
+                        focusNode: searchFocusNode,
+                        style: TextStyle(
+                            fontSize: 14,
+                            color: widget.inputTextColor ??
+                                const Color(0xFF000000)),
+                        textInputAction: TextInputAction.search,
+                        controller: searchInfoController,
+                        onSubmitted: (value) => _search(),
+                        decoration: InputDecoration(
+                          contentPadding: const EdgeInsets.symmetric(
+                              horizontal: 0.0, vertical: 8.0),
+                          isDense: true,
+                          counterText: "",
+                          hintText: widget.hintText,
+                          hintStyle: TextStyle(
+                              fontSize: 14.0,
+                              color: widget.hintTextColor ??
+                                  const Color(0xFF999999)),
+                          border: InputBorder.none, //去掉下划线
+                          //hintStyle: TextStyles.textGrayC14
                         ),
                       ),
-                    ],
-                  ),
+                    ),
+                  ],
                 ),
               ),
-              InkWell(
-                onTap: () => _search(),
-                child: Container(
-                  width: 60.0,
-                  alignment: Alignment.center,
-                  child: const Text(
-                    "搜索",
-                    style: TextStyle(color: Color(0xFFFFFFFF), fontSize: 14.0),
-                  ),
+            ),
+            InkWell(
+              onTap: () => _search(),
+              child: Container(
+                width: 60.0,
+                alignment: Alignment.center,
+                child: const Text(
+                  "搜索",
+                  style: TextStyle(color: Color(0xFFFFFFFF), fontSize: 14.0),
                 ),
-              )
-            ],
-          ),
+              ),
+            )
+          ],
         ),
       ),
     );