flutter全透明式狀態欄/沉浸式|flutter+BottomAppBar組件仿鹹魚凸起導航欄

• Flutter如何實現沉浸式狀態欄效果？

如下圖：狀態欄是指手機頂部顯示手機狀態信息的位置。android 4.4之後開始支持透明狀態欄功能，狀態欄可以自定義顏色背景，使titleBar能夠和狀態欄融爲一體，增加沉浸感。

默認Flutter狀態欄是黑色半透明，那麼如何去掉這個狀態欄的黑色半透明背景色，讓其和標題欄顏色一致，實現如下圖效果呢？

 

在flutter項目目錄下找到android主入口頁面MainActivity.kt或MainActivity.java，判斷一下版本號然後將狀態欄顏色修改設置成透明，因爲他本身是黑色半透明。

修改MainActivity.kt頁面新增如下代碼片段

//設置狀態欄沉浸式透明（修改flutter狀態欄黑色半透明爲全透明）
override fun onCreate(savedInstanceState: Bundle?) {
    super.onCreate(savedInstanceState);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
        window.statusBarColor = 0
    }
}

package com.example.flutter_app

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;

class MainActivity: FlutterActivity() {
    override fun configureFlutterEngine(@NonNull flutterEngine: FlutterEngine) {
        GeneratedPluginRegistrant.registerWith(flutterEngine);
    }

    //設置狀態欄沉浸式透明（修改flutter狀態欄黑色半透明爲全透明）
    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState);
        if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
            window.statusBarColor = 0
        }
    }
}

注意：flutter項目默認是使用Kotlin語言

通過 flutter create flutter_app  命令創建flutter項目時，默認是Kotlin語言模式；

如果想要修改成Java語言，則運行如下命令創建項目即可 flutter create -a java flutter_app 

如果是java語言模式下，修改沉浸式狀態欄方法和上面同理

MainActivity.java路徑： android\app\src\main\java\com\example\flutter_app\MainActivity.java 

在MainActivity.java頁面新增如下高亮代碼片段

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);
  }

  // 設置狀態欄沉浸式透明（修改flutter狀態欄黑色半透明爲全透明）
  @Override
  protected void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.LOLLIPOP) {
      getWindow().setStatusBarColor(0);
    }
  }
}

去掉右上角banner圖，設置debugShowCheckedModeBanner: false,

return MaterialApp(
    title: 'Flutter Demo',
    debugShowCheckedModeBanner: false,
    theme: ThemeData(
        primarySwatch: Colors.green,
    ),
    home: MyHomePage(title: 'Flutter Demo App'),
    ...
);

• Flutter中實現鹹魚底部導航凸起效果

如上圖： BottomNavigationBar 組件普通底部導航欄配置

int _selectedIndex = 0;
// 創建數組引入頁面
List pglist = [HomePage(), FindPage(), CartPage(), ZonePage(), UcenterPage(),];

...

Scaffold(
    body: pglist[_selectedIndex],
    
    // 抽屜菜單
    // drawer: new Drawer(),

    // 普通底部導航欄
    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')),
            BottomNavigationBarItem(icon: Icon(Icons.search), title: Text('Find')),
            BottomNavigationBarItem(icon: Icon(Icons.add), title: Text('Cart')),
            BottomNavigationBarItem(icon: Icon(Icons.photo_filter), title: Text('Zone')),
            BottomNavigationBarItem(icon: Icon(Icons.face), title: Text('Ucenter')),
        ],
        currentIndex: _selectedIndex,
        onTap: _onItemTapped,
    ),
)

void _onItemTapped(int index) {
    setState(() {
        _selectedIndex = index;
    });
}

通過BottomNavigationBar組件實現仿鹹魚凸起導航欄配置

int _selectedIndex = 0;
// 創建數組引入頁面
List pglist = [HomePage(), FindPage(), CartPage(), ZonePage(), UcenterPage(),];

...

Scaffold(
    body: pglist[_selectedIndex],
    
    // 抽屜菜單
    // drawer: new Drawer(),

    // 普通底部導航欄
    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')),
            BottomNavigationBarItem(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;
    });
}

 

如上圖： BottomAppBar 組件凸起凹陷導航欄配置

int _selectedIndex = 0;
// 創建數組引入頁面
List pglist = [HomePage(), FindPage(), CartPage(), ZonePage(), UcenterPage(),];

...

Scaffold(
    body: pglist[_selectedIndex],
    
    // 抽屜菜單
    // drawer: new Drawer(),

    // 底部凸起凹陷導航欄
    bottomNavigationBar: BottomAppBar(
        color: Colors.white,
        shape: CircularNotchedRectangle(),
        child: Row(
            mainAxisAlignment: MainAxisAlignment.spaceAround,
            children: <Widget>[
                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);
                    },
                ),
            ],
        ),
    ),
)

void _onItemTapped(int index) {
    setState(() {
        _selectedIndex = index;
    });
}

ok 這次就分享到這裏，最後附上個基於uniapp開發的仿抖音短視頻實例項目

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