如何在android studio中检测网络连接

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

ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

if (networkInfo != null && networkInfo.isConnected()) {
    // 网络已连接
} else {
    // 网络未连接
}

private BroadcastReceiver networkChangeReceiver = new BroadcastReceiver() {
    @Override
    public void onReceive(Context context, Intent intent) {
        ConnectivityManager connectivityManager = (ConnectivityManager) getSystemService(Context.CONNECTIVITY_SERVICE);
        NetworkInfo networkInfo = connectivityManager.getActiveNetworkInfo();

        if (networkInfo != null && networkInfo.isConnected()) {
            // 网络已连接
        } else {
            // 网络未连接
        }
    }
};

// 注册广播接收器
IntentFilter intentFilter = new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION);
registerReceiver(networkChangeReceiver, intentFilter);

@Override
protected void onResume() {
    super.onResume();
    registerReceiver(networkChangeReceiver, new IntentFilter(ConnectivityManager.CONNECTIVITY_ACTION));
}

@Override
protected void onPause() {
    super.onPause();
    unregisterReceiver(networkChangeReceiver);
}