Android Studio 基础之获取 Wifi 的状态，设置 Wifi 的开关状态，并监听 Wifi 的状态变化方法整理

女爷i 2022-11-29 13:18 614阅读 0赞

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# Android Studio 基础 之 获取 Wifi 的状态，设置 Wifi 的开关状态，并监听 Wifi 的状态变化方法整理 #

**目录**

Android Studio 基础 之 获取 Wifi 的状态，设置 Wifi 的开关状态，并监听 Wifi 的状态变化方法整理

一、简单介绍

二、实现原理

三、注意事项

四、效果预览

五、实现步骤

六、关键代码

--------------------

## 一、简单介绍 ##

Android 开发中的一些基础操作，使用整理，便于后期使用。

本节介绍，Android 开发中，获取手机设备的蓝牙Bluetooth的状态，并设置蓝牙Bluetooth开关，监听蓝牙Bluetooth的状态变化，方法不唯一，欢迎指正。

## 二、实现原理 ##

1、getSystemService(Context.WIFI\_SERVICE) 获取 Wifi 管理器 WifiManager

2、WifiManager.isWifiEnabled() 获取 Wifi 状态

3、WifiManager.setWifiEnabled(true)/WifiManager.setWifiEnabled(false) 设置 Wifi 开关

4、使用广播监听 WifiManager.WIFI\_STATE\_CHANGED\_ACTION 网络Wifi 的状态变化

## 三、注意事项 ##

1、需要添加 Wifi 相关权限

> <uses-permission android:name="android.permission.ACCESS\_WIFI\_STATE"/>
> 
> <uses-permission android:name="android.permission.CHANGE\_WIFI\_STATE"/>

## 四、效果预览 ##

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70][]

## 五、实现步骤 ##

1、打开 Android Studio 新建一个工程，或者新建一个模块

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 1][]

2、默认操作，一路创建一个模块

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 2][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 3][]

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 4][]

3、创建一个 WifiUtil，编写获取Wifi状态，设置Wifi状态，和监听Wifi状态变化的方法

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 5][]

4、MainActivity ，测试 WifiUtil 封装的方法

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 6][]

5、打包，在设备上测试，效果如上

![watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3UwMTQzNjEyODA_size_16_color_FFFFFF_t_70 7][]

## 六、关键代码 ##

1、WifiUtil

package com.example.wifitest;
    
    import android.bluetooth.BluetoothAdapter;
    import android.bluetooth.BluetoothDevice;
    import android.content.BroadcastReceiver;
    import android.content.Context;
    import android.content.Intent;
    import android.content.IntentFilter;
    import android.net.wifi.WifiManager;
    import android.util.Log;
    import android.widget.Toast;
    
    public class WifiUtil {
    
        private static final String TAG = "Main";
    
        private WifiManager _WifiManager;
        private Context _Context;
        private WifiStateBroadcastReceive mReceive;
    
        public WifiUtil(Context context) {
    
            _Context = context;
    
    
            _WifiManager = (WifiManager)_Context.getSystemService(Context.WIFI_SERVICE);
        }
    
        public boolean getWifiState() {
            // 获取蓝牙状态
            return _WifiManager.isWifiEnabled();
        }
    
        public boolean openWifi() {
            if (getWifiState()) return true;
            // 打开蓝牙
            return _WifiManager.setWifiEnabled(true);
        }
    
        public boolean cloaseWifi() {
            if (!getWifiState()) return true;
            // 关闭蓝牙
            return _WifiManager.setWifiEnabled(false);
        }
    
    
        public void registerWifiReceiver(){
            if(mReceive == null){
                mReceive = new WifiStateBroadcastReceive();
            }
            IntentFilter intentFilter = new IntentFilter();
            intentFilter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
            _Context.registerReceiver(mReceive, intentFilter);
        }
    
        public void unregisterWifiReceiver(){
            if(mReceive != null){
                _Context.unregisterReceiver(mReceive);
                mReceive = null;
            }
        }
    
        class WifiStateBroadcastReceive extends BroadcastReceiver {
    
            @Override
            public void onReceive(Context context, Intent intent) {
                int wifiState = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, 0);
                switch (wifiState) {
                    case WifiManager.WIFI_STATE_DISABLED:
                        Toast.makeText(context , "Wifi已关闭", Toast.LENGTH_SHORT).show();
                        Log.i(TAG, "onReceive: "+"Wifi已关闭");
                        break;
                    case WifiManager.WIFI_STATE_DISABLING:
                        Toast.makeText(context , "Wifi正在关闭", Toast.LENGTH_SHORT).show();
                        Log.i(TAG, "onReceive: "+"Wifi正在关闭...");
                        break;
                    case WifiManager.WIFI_STATE_ENABLED:
                        Toast.makeText(context , "Wifi已打开", Toast.LENGTH_SHORT).show();
                        Log.i(TAG, "onReceive: "+"Wifi已打开");
                        break;
                    case WifiManager.WIFI_STATE_ENABLING:
                        Toast.makeText(context , "Wifi正在打开", Toast.LENGTH_SHORT).show();
                        Log.i(TAG, "onReceive: "+"Wifi正在打开...");
                        break;
                    case WifiManager.WIFI_STATE_UNKNOWN:
    
                        break;
                }
            }
        }
    
    }

2、MainActivity

package com.example.wifitest;
    
    import android.support.v7.app.AppCompatActivity;
    import android.os.Bundle;
    import android.util.Log;
    
    public class MainActivity extends AppCompatActivity {
    
        private static  final String TAG = "MainActivity";
        WifiUtil _WifiUtil;
        @Override
        protected void onCreate(Bundle savedInstanceState) {
            super.onCreate(savedInstanceState);
            setContentView(R.layout.activity_main);
    
    
            _WifiUtil = new WifiUtil(this);
            Log.i(TAG, "onCreate: getWifiState() " + _WifiUtil.getWifiState());
            _WifiUtil.cloaseWifi();
            Log.i(TAG, "onCreate: getWifiState() " + _WifiUtil.getWifiState());
            _WifiUtil.openWifi();
            Log.i(TAG, "onCreate: getWifiState() " + _WifiUtil.getWifiState());
    
            _WifiUtil.registerWifiReceiver();
        }
    
        @Override
        protected void onDestroy() {
            _WifiUtil.unregisterWifiReceiver();
            super.onDestroy();
        }
    }

3、AndroidManifest.xml

<?xml version="1.0" encoding="utf-8"?>
    <manifest xmlns:android="http://schemas.android.com/apk/res/android"
        package="com.example.wifitest">
        <uses-permission android:name="android.permission.ACCESS_WIFI_STATE"/>
        <uses-permission android:name="android.permission.CHANGE_WIFI_STATE"/>
        <application
            android:allowBackup="true"
            android:icon="@mipmap/ic_launcher"
            android:label="@string/app_name"
            android:roundIcon="@mipmap/ic_launcher_round"
            android:supportsRtl="true"
            android:theme="@style/AppTheme">
            <activity android:name=".MainActivity">
                <intent-filter>
                    <action android:name="android.intent.action.MAIN" />
    
                    <category android:name="android.intent.category.LAUNCHER" />
                </intent-filter>
            </activity>
        </application>
    
    </manifest>

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