DialogFragment 不会在 AsyncTask 中关闭

Question

我有办法每 15 秒检查一次 Internet 连接。如果没有互联网连接，该方法将调用 dialogfragment。到目前为止它完美无缺。建立互联网连接后，我无法关闭 dialogFragment。 Logcat不报错。 "dialogfragment dissmis" 不工作，dialogfragment 保留在屏幕上。

首先，我断开与互联网的连接并调用 dialogFragment。后来的互联网连接是运行和 "Device is connected to internet." 我看到了文字。但是dialogfragment并没有消失。

CheckInternetAsyncTask.class

public 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;
        }
    }

    @Override
    protected void onPostExecute(Boolean result) {
        super.onPostExecute(result);
        //Log.d("TAG", "result" + result);

        if(result){
            // do ur code
            Toast.makeText(context,"Device is connected to internet.", Toast.LENGTH_LONG).show();
            EthernetControlFragment ethernetControlFragment = EthernetControlFragment.newInstance();

            if (ethernetControlFragment != null
                    && ethernetControlFragment.getDialog() != null
                    && ethernetControlFragment.getDialog().isShowing()
                    && !ethernetControlFragment.isRemoving()) {
                //dialog is showing so do something
                ethernetControlFragment.dismissAllowingStateLoss();
            } else {
                //dialog is not showing
            }

        }
        else {
            Toast.makeText(context,"Device is not connected to internet!",Toast.LENGTH_LONG).show();
            EthernetControlFragment ethernetControlFragment = EthernetControlFragment.newInstance();

            if (ethernetControlFragment != null
                    && ethernetControlFragment.getDialog() != null
                    && ethernetControlFragment.getDialog().isShowing()
                    && !ethernetControlFragment.isRemoving()) {
                //dialog is showing so do something
            } else {
                //dialog is not showing
                ethernetControlFragment.show(((FragmentActivity) activity).getSupportFragmentManager(), "ethernet");
                ethernetControlFragment.setCancelable(false);
            }
        }

    }
}

EthernetControlFragment

public class EthernetControlFragment extends DialogFragment {

Context context;

public static EthernetControlFragment newInstance(){
    return new EthernetControlFragment();
}



@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);
    setStyle(DialogFragment.STYLE_NORMAL, R.style.dogum_haritasi_dialog);

}


@Nullable
@Override
public View onCreateView(@NonNull LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
    View view = inflater.inflate(R.layout.ethernet_controls,container,false);

    return view;
}}

Answer 1

好的，我将在这里详细解释。

15 秒前您使用以下行创建了一个对话框，我们称它为 object1

EthernetControlFragment.newInstance()

然后 15 秒后，您将再次使用上面的行创建一个新对话框 object2，当您关闭它时，您将关闭这个新对话框 object2。不幸的是，您没有保留对旧 Dialog dialog1 的引用，这是真正的问题。

解决方案是只创建一个对象，因此创建 EthernetControlFragment class 的全局引用并仅在它为 null 时初始化它。这样您将只有一个对话框。

Answer 2

我解决了我的问题。像这样调用片段：

    Fragment prev = ((FragmentActivity) activity).getSupportFragmentManager().findFragmentByTag("ethernet");
    if (prev == null) {
        ethernetControlFragment.show(((FragmentActivity) activity).getSupportFragmentManager(), "ethernet");
        ethernetControlFragment.setCancelable(false);
    }

然后像这样解散：

Fragment prev = ((FragmentActivity) activity).getSupportFragmentManager().findFragmentByTag("ethernet");
            if (prev != null) {
                EthernetControlFragment df = (EthernetControlFragment) prev;
                df.dismiss();
            }

我认为这些方法是调用和关闭 fragment 的最可靠方法。

DialogFragment 不会在 AsyncTask 中关闭

DialogFragment does not close in AsyncTask

java

android

fragment