一、添加权限

<uses-permission android:name="android.permission.ACCESS_WIFI_STATE" /> 
<uses-permission Android:name="android.permission.ACCESS_NETWORK_STATE" />

二、注册监听广播

注册监听有两种方式
1.AndroidMainfest.xml 中注册

<receiver android:name="com.receiver.WifiReceiver">
    <intent-filter >
       <action android:name="android.net.wifi.RSSI_CHANGED"/>
       <action android:name="android.net.wifi.STATE_CHANGE"/>
       <action android:name="android.net.wifi.WIFI_STATE_CHANGED"/>
    </intent-filter>
</receiver>

2.在代码中注册

 IntentFilter filter = new IntentFilter();
 filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);
 filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);
 filter.addAction(ConnectivityManager.CONNECTIVITY_ACTION);
 registerReceiver(new WifiReceiver(), filter);

三、实现监听广播类

public class WifiReceiver extends BroadcastReceiver {
    private static final String TAG = "wifiReceiver";
    @Override
    public void onReceive(Context context, Intent intent) {
        if (intent.getAction().equals(WifiManager.RSSI_CHANGED_ACTION)) {
            Log.i(TAG, "wifi信号强度变化");
        }
        //wifi连接上与否
        if (intent.getAction().equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {

            NetworkInfo info = intent.getParcelableExtra(WifiManager.EXTRA_NETWORK_INFO);
            if (info.getState().equals(NetworkInfo.State.DISCONNECTED)) {
                Log.i(TAG, "wifi断开");
            } else if (info.getState().equals(NetworkInfo.State.CONNECTED)) {
                WifiManager wifiManager = (WifiManager) context.getSystemService(Context.WIFI_SERVICE);
                WifiInfo wifiInfo = wifiManager.getConnectionInfo();
                //获取当前wifi名称
                Log.i(TAG, "连接到网络 " + wifiInfo.getSSID());
                TtsManager ttsManager = new TtsManager();
                ttsManager.checkTtsJet(context.getApplicationContext());
            }
        }
        //wifi打开与否
        if (intent.getAction().equals(WifiManager.WIFI_STATE_CHANGED_ACTION)) {
            int wifistate = intent.getIntExtra(WifiManager.EXTRA_WIFI_STATE, WifiManager.WIFI_STATE_DISABLED);
            if (wifistate == WifiManager.WIFI_STATE_DISABLED) {
                Log.i(TAG, "系统关闭wifi");
            } else if (wifistate == WifiManager.WIFI_STATE_ENABLED) {
                Log.i(TAG, "系统开启wifi");
            }
        }
    }
}

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