}
}
}
注意：flutter项目默认是使用Kotlin语言
在Google I/O 2017中，Google 宣布 Kotlin 取代 Java 成为 Android 官方开发语言。
Kotlin详情见：https://www.kotlincn.net/
通过 flutter create flutter_app 命令创建flutter项目时，默认是Kotlin语言模式，如果想要修改成Java语言，则运行如下命令创建项目即可
flutter create -a java flutter_app
如果是java语言模式下，修改沉浸式状态栏方法和上面同理
MainActivity.java路径：
androidappsrcmainjavacomexampleflutter_appMainActivity.java
在MainActivity.java页面新增如下代码
package com.example.demo1;
import androidx.annotation.NonNull;
import io.flutter.embedding.android.FlutterActivity;
import io.flutter.embedding.engine.FlutterEngine;
import io.flutter.plugins.GeneratedPluginRegistrant;
// 引入
import android.os.Build;
import android.os.Bundle;
public class MainActivity extends FlutterActivity {
@Override
public void configureFlutterEngine(@NonNull FlutterEngine flutterEngine) {
GeneratedPluginRegistrant.registerWith(flutterEngine);
}
// 设置状态栏沉浸式透明（修改flutter状态栏黑色半透明为全透明）
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
getWindow().setStatusBarColor(0);
}
}
}
如下图： BottomNavigationBar 组件仿咸鱼凸起导航栏配置
int _selectedIndex = 0;
// 创建数组引入页面
List pglist = [HomePage(), FindPage(), CartPage(), ZonePage(), UcenterPage(),];
…
Scaffold(
body: pglist[_selectedIndex],
// 抽屉菜单
// drawer: new Drawer(),
// 普通底部导航栏
bottomNavigationBar: BottomNavigationBar(
fixedColor: Colors.red,
type: BottomNavigationBarType.fixed,
elevation: 5.0,
unselectedFontSize: 12.0,
selectedFontSize: 18.0,
items: [
BottomNavigationBarItem(icon: Icon(Icons.home), title: Text(‘Home’)),
BottomNa
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vigationBarItem(icon: Icon(Icons.search), title: Text(‘Find’)),
BottomNavigationBarItem(icon: Icon(null), title: Text(‘Cart’)),
BottomNavigationBarItem(icon: Icon(Icons.photo_filter), title: Text(‘Zone’)),
BottomNavigationBarItem(icon: Icon(Icons.face), title: Text(‘Ucenter’)),
],
currentIndex: _selectedIndex,
onTap: _onItemTapped,
),
floatingActionButton: FloatingActionButton(
backgroundColor: _selectedIndex == 2 ? Colors.red : Colors.grey,
child: Column(
mainAxisAlignment: MainAxisAlignment.center,
children: [
Icon(Icons.add)
]
),
onPressed: (){
setState(() {
_selectedIndex = 2;
});
},
),
floatingActionButtonLocation: FloatingActionButtonLocation.centerDocked,
)
void _onItemTapped(int index) {
setState(() {
_selectedIndex = index;
});
}
如下图： BottomAppBar 组件凸起凹陷导航栏配置
int _selectedIndex = 0;
// 创建数组引入页面
List pglist = [HomePage(), FindPage(), CartPage(), ZonePage(), UcenterPage(),];
…
Scaffold(
body: pglist[_selectedIndex],
// 抽屉菜单
// drawer: new Drawer(),
// 底部凸起凹陷导航栏
bottomNavigationBar: BottomAppBar(
color: Colors.white,
shape: CircularNotchedRectangle(),
child: Row(
mainAxisAlignment: MainAxisAlignment.spaceAround,
children: [
IconButton(
icon: Icon(Icons.home),
color: _selectedIndex == 0 ? Colors.red : Colors.grey,
onPressed: (){
_onItemTapped(0);
},
),
IconButton(
icon: Icon(Icons.search),
color: _selectedIndex == 1 ? Colors.red : Colors.grey,
onPressed: (){
_onItemTapped(1);
},
),
SizedBox(width: 50,),
IconButton(
icon: Icon(Icons.photo_filter),
color: _selectedIndex == 3 ? Colors.red : Colors.grey,
onPressed: (){
_onItemTapped(3);
},
),
IconButton(
icon: Icon(Icons.face),
color: _selectedIndex == 4 ? Colors.red : Colors.grey,
onPressed: (){
_onItemTapped(4);
},
),
],
),
onItemTapped(3);
},
),
IconButton(
icon: Icon(Icons.face),
color: _selectedIndex == 4 ? Colors.red : Colors.grey,
onPressed: (){
_onItemTapped(4);
},
),
],
),
