我有辦法每 15 秒檢查一次互聯(lián)網(wǎng)連接。如果沒(méi)有互聯(lián)網(wǎng)連接，該方法將調(diào)用dialogfragment。到目前為止，它運(yùn)行得很好。建立互聯(lián)網(wǎng)連接后，我無(wú)法關(guān)閉dialogFragment。Logcat 沒(méi)有給出錯(cuò)誤。“dialogfragment dissmis”不起作用，dialogfragment 仍保留在屏幕上。首先，我斷開(kāi)與互聯(lián)網(wǎng)的連接并調(diào)用dialogFragment。隨后互聯(lián)網(wǎng)連接正在運(yùn)行并且“設(shè)備已連接到互聯(lián)網(wǎng)”。我看到文字了。但對(duì)話框片段并沒(méi)有消失。檢查InternetAsyncTask.classpublic class CheckInternetAsyncTask extends AsyncTask<Void, Integer, Boolean> {    Activity activity;    private Context context;    public CheckInternetAsyncTask(Activity activity) {        this.context = activity.getApplicationContext();        this.activity = activity;    }    @Override    protected Boolean doInBackground(Void... params) {        ConnectivityManager cm =                (ConnectivityManager)context.getSystemService(Context.CONNECTIVITY_SERVICE);        assert cm != null;        NetworkInfo activeNetwork = cm.getActiveNetworkInfo();        boolean isConnected = activeNetwork != null &&                activeNetwork.isConnected();        if (isConnected) {            try {                InetAddress ipAddr = InetAddress.getByName("google.com");                //You can replace it with your name                return !ipAddr.equals("");            } catch (Exception e) {                Log.e("TAG", "Error checking internet connection"+ e.getMessage());                return false;            }        } else {            //Log.d("TAG", "No network available!");            return false;        }    }