Android 监听Wifi状态和信号强度

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以下知识点是针对wifi的开关、信号、信号变化监听的。

权限：

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

获取wifi状态代码：

// 获取wifi开关状态int wifiState = mWifiManager.getWifiState();// 获取扫描获取的wifi数据集合信息List<ScanResult> scanResults = mWifiManager.getScanResults();// 信号level//int level = scanResults.get(1).level;// 获取当前连接的wifi信息WifiInfo connectionInfo = mWifiManager.getConnectionInfo();int rssi = connectionInfo.getRssi();// 计算获取level 5表示你的level-list的lengthint level = WifiManager.calculateSignalLevel(rssi, 5);

监听信号强度变化：

IntentFilter filter = new IntentFilter();filter.addAction(WifiManager.RSSI_CHANGED_ACTION);filter.addAction(WifiManager.WIFI_STATE_CHANGED_ACTION);filter.addAction(WifiManager.NETWORK_STATE_CHANGED_ACTION);context.registerReceiver(broadcastReceiver,filter);public BroadcastReceiver broadcastReceiver = new BroadcastReceiver{``    @Override    public void onReceive(Context context, Intent intent) {        final String action = intent.getAction();        if (action.equals(WifiManager.RSSI_CHANGED_ACTION)                || action.equals(WifiManager.WIFI_STATE_CHANGED_ACTION)                || action.equals(WifiManager.NETWORK_STATE_CHANGED_ACTION)) {            // 可以使用 获取wifi状态代码 相关代码            refreshWifiIconState();        }``};