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Versuchen Sie, eine virtuelle Methode aufzurufen

Ich versuche, LinearLayouts in meiner onCreateView zu bekommen, aber meine App stürzt mit der folgenden Meldung ab:

23430-23430/? W/System.err﹕ Java.lang.NullPointerException: Attempt to invoke virtual method 'Android.view.View Android.view.View.findViewById(int)' on a null object reference

Hier ist der Code:

@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
                         Bundle savedInstanceState) {

    View rootView = inflater.inflate(R.layout.fragment_main, container, false);

    new Body().execute();

        card01 = (LinearLayout) getView().findViewById(R.id.card01);
        card02 = (LinearLayout) getView().findViewById(R.id.card02);
        card03 = (LinearLayout) getView().findViewById(R.id.card03);
        card04 = (LinearLayout) getView().findViewById(R.id.card04);
        card05 = (LinearLayout) getView().findViewById(R.id.card05);
        card06 = (LinearLayout) getView().findViewById(R.id.card06);


        card01.setOnClickListener(new View.OnClickListener() {
            @Override
            public void onClick(View v) {
                Toast.makeText(getActivity(), "Card Clicked", Toast.LENGTH_SHORT).show();
            }
        });

    return rootView;
}

Dies ist eine reine Fragment-Klasse. Die Activity, die diese Fragment aufruft, enthält diese Fragment nicht. Mache ich es falsch? Sollte die Fragment immer innerhalb der Activity sein?

Wie gewünscht, das ganze AsyncTask:

    // AsyncTask
    private class Body extends AsyncTask<Void, Void, Void> {

        @Override
        protected void onPreExecute() {
            super.onPreExecute();

            mProgressDialog = new ProgressDialog(getActivity());
            mProgressDialog.setTitle("Fetching your info");
            mProgressDialog.setMessage("Loading...");
            mProgressDialog.setIndeterminate(false);
            mProgressDialog.show();

        }

        @Override
        protected Void doInBackground(Void... params) {

            Document doc;

            try {
                // Connect to the web site
                doc = Jsoup.connect(url).get();

                // Using Elements to get the Meta data

                //Date of Event
                Elements dateElement = doc.select("span[class=date-display-single]");

                //Headline of Event
                Elements titleElement = doc.select("h2[property=schema:name]");

                //Description of Event
                Elements bodyElement = doc.select("div[class=field field-name-body field-type-text-with-summary field-label-hidden]");

                // get the dates
                date1 = dateElement.eq(0).text();
                date2 = dateElement.eq(1).text();
                date3 = dateElement.eq(2).text();
                date4 = dateElement.eq(3).text();
                date5 = dateElement.eq(4).text();
                date6 = dateElement.eq(5).text();

                // get headlines
                head1 = titleElement.eq(0).text();
                head2 = titleElement.eq(1).text();
                head3 = titleElement.eq(2).text();
                head4 = titleElement.eq(3).text();
                head5 = titleElement.eq(4).text();
                head6 = titleElement.eq(5).text();

                // get description
                body1 = bodyElement.eq(0).toString();
                body1 = Jsoup.parse(body1.replaceAll("<br />", "br2n")).toString();
                body1 = Jsoup.parse(body1.replaceAll("</p>", "p2n")).text();
                body1 = body1.replaceAll("br2n", "\n");
                body1 = body1.replaceAll("p2n", "\n\n");

                body2 = bodyElement.eq(1).toString();
                body2 = Jsoup.parse(body2.replaceAll("<br />", "br2n")).toString();
                body2 = Jsoup.parse(body2.replaceAll("</p>", "p2n")).text();
                body2 = body2.replaceAll("br2n", "\n");
                body2 = body2.replaceAll("p2n", "\n\n");

                body3 = bodyElement.eq(2).toString();
                body3 = Jsoup.parse(body3.replaceAll("<br />", "br2n")).toString();
                body3 = Jsoup.parse(body3.replaceAll("</p>", "p2n")).text();
                body3 = body3.replaceAll("br2n", "\n");
                body3 = body3.replaceAll("p2n", "\n\n");

                body4 = bodyElement.eq(3).toString();
                body4 = Jsoup.parse(body4.replaceAll("<br />", "br2n")).toString();
                body4 = Jsoup.parse(body4.replaceAll("</p>", "p2n")).text();
                body4 = body4.replaceAll("br2n", "\n");
                body4 = body4.replaceAll("p2n", "\n\n");

                body5 = bodyElement.eq(4).toString();
                body5 = Jsoup.parse(body5.replaceAll("<br />", "br2n")).toString();
                body5 = Jsoup.parse(body5.replaceAll("</p>", "p2n")).text();
                body5 = body5.replaceAll("br2n", "\n");
                body5 = body5.replaceAll("p2n", "\n\n");

                body6 = bodyElement.eq(5).toString();
                body6 = Jsoup.parse(body6.replaceAll("<br />", "br2n")).toString();
                body6 = Jsoup.parse(body6.replaceAll("</p>", "p2n")).text();
                body6 = body6.replaceAll("br2n", "\n");
                body6 = body6.replaceAll("p2n", "\n\n");

                //cut out the date in the headlines (13 characters) if the String has something to cut
                //Let's  hope the website stays like this
                if (head1.length() > 0) {
                    head1 = head1.substring(13);
                }
                if (head2.length() > 0) {
                    head2 = head2.substring(13);
                }
                if (head3.length() > 0) {
                    head3 = head3.substring(13);
                }
                if (head4.length() > 0) {
                    head4 = head4.substring(13);
                }
                if (head5.length() > 0) {
                    head5 = head5.substring(13);
                }
                if (head6.length() > 0) {
                    head6 = head6.substring(13);
                }

                //Get Event Labels
                AssetManager am = getActivity().getAssets();
                bwe = BitmapFactory.decodeStream(am.open("label/bwe.jpg"));
                commaklar = BitmapFactory.decodeStream(am.open("label/commaklar.jpg"));
//                musica = BitmapFactory.decodeStream(am.open("label/musica.jpg"));
                doualatag = BitmapFactory.decodeStream(am.open("label/doualatag.jpg"));
                synestesia = BitmapFactory.decodeStream(am.open("label/synestesia.jpg"));
                douala = BitmapFactory.decodeStream(am.open("label/douala.jpg"));
//                tanzen = BitmapFactory.decodeStream(am.open("label/tanzen.jpg"));
//                nacht = BitmapFactory.decodeStream(am.open("label/nacht.jpg"));
            } catch (Exception e) {
                e.printStackTrace();
            }
            return null;
        }

        @Override
        protected void onPostExecute(Void result) {
            mProgressDialog.dismiss();

            try {

                RobotoTextView date_widget1 = (RobotoTextView) getActivity().findViewById(R.id.date01);
                date_widget1.setText(date1);

                RobotoTextView head_widget1 = (RobotoTextView) getActivity().findViewById(R.id.head01);
                head_widget1.setText(head1);

                RobotoTextView body_widget1 = (RobotoTextView) getActivity().findViewById(R.id.body1);
                Whitelist.simpleText().addTags("br", "p");
                body_widget1.setText(body1);

                ImageView label1 = (ImageView) getView().findViewById(R.id.label1);

                if (head1.contains("BLACKWHITE")) {
                    label1.setImageBitmap(bwe);
                }
                if (date1.contains("Do")) {
                    ;
                    label1.setImageBitmap(doualatag);
                }
                if (head1.contains("COMMAKLAR")) {
                    label1.setImageBitmap(commaklar);
                }
                if (head1.toLowerCase().contains("synestesia") | head1.contains("SYNESTESIA")) {
                    label1.setImageBitmap(synestesia);
                }
                if (label1.getDrawable() == null) {
                    label1.setImageBitmap(douala);
                }

                RobotoTextView date_widget2 = (RobotoTextView) getActivity().findViewById(R.id.date02);
                date_widget2.setText(date2);

                RobotoTextView head_widget2 = (RobotoTextView) getActivity().findViewById(R.id.head02);
                head_widget2.setText(head2);

                RobotoTextView body_widget2 = (RobotoTextView) getActivity().findViewById(R.id.body2);
                body_widget2.setText(body2);

                ImageView label2 = (ImageView) getView().findViewById(R.id.label2);

                if (head2.contains("BLACKWHITE")) {
                    label2.setImageBitmap(bwe);
                }
                if (date2.contains("Do")) {
                    label2.setImageBitmap(doualatag);
                }
                if (head2.contains("COMMAKLAR")) {
                    label2.setImageBitmap(commaklar);
                }
                if (head2.toLowerCase().contains("synestesia")) {
                    label2.setImageBitmap(synestesia);
                }
                if (label2.getDrawable() == null) {
                    label2.setImageBitmap(douala);
                }

                RobotoTextView date_widget3 = (RobotoTextView) getActivity().findViewById(R.id.date03);
                date_widget3.setText(date3);

                RobotoTextView head_widget3 = (RobotoTextView) getActivity().findViewById(R.id.head03);
                head_widget3.setText(head3);

                RobotoTextView body_widget3 = (RobotoTextView) getActivity().findViewById(R.id.body3);
                body_widget3.setText(body3);

                ImageView label3 = (ImageView) getView().findViewById(R.id.label3);

                if (head3.contains("BLACKWHITE")) {
                    label3.setImageBitmap(bwe);
                }
                if (date3.contains("Do")) {
                    label3.setImageBitmap(doualatag);
                }
                if (head3.contains("COMMAKLAR")) {
                    label3.setImageBitmap(commaklar);
                }
                if (head3.toLowerCase().contains("synestesia")) {
                    label3.setImageBitmap(synestesia);
                }
                if (label3.getDrawable() == null) {
                    label3.setImageBitmap(douala);
                }

                RobotoTextView date_widget4 = (RobotoTextView) getActivity().findViewById(R.id.date04);
                date_widget4.setText(date4);

                RobotoTextView head_widget4 = (RobotoTextView) getActivity().findViewById(R.id.head04);
                head_widget4.setText(head4);

                RobotoTextView body_widget4 = (RobotoTextView) getActivity().findViewById(R.id.body4);
                body_widget4.setText(body4);

                ImageView label4 = (ImageView) getView().findViewById(R.id.label4);

                if (head4.contains("BLACKWHITE")) {
                    label4.setImageBitmap(bwe);
                }
                if (date4.contains("Do")) {
                    label4.setImageBitmap(doualatag);
                }
                if (head4.contains("COMMAKLAR")) {
                    label4.setImageBitmap(commaklar);
                }
                if (head4.toLowerCase().contains("synestesia")) {
                    label4.setImageBitmap(synestesia);
                }
                if (label4.getDrawable() == null) {
                    label4.setImageBitmap(douala);
                }

                if (!head5.equals("")) {
                    RobotoTextView date_widget5 = (RobotoTextView) getActivity().findViewById(R.id.date05);
                    date_widget5.setText(date5);

                    RobotoTextView head_widget5 = (RobotoTextView) getActivity().findViewById(R.id.head05);
                    head_widget5.setText(head5);

                    RobotoTextView body_widget5 = (RobotoTextView) getActivity().findViewById(R.id.body5);
                    body_widget5.setText(body5);

                    ImageView label5 = (ImageView) getView().findViewById(R.id.label5);

                    if (head5.contains("BLACKWHITE")) {
                        label5.setImageBitmap(bwe);
                    }
                    if (date5.contains("Do")) {
                        label5.setImageBitmap(doualatag);
                    }
                    if (head5.contains("COMMAKLAR")) {
                        label5.setImageBitmap(commaklar);
                    }
                    if (head5.toLowerCase().contains("synestesia")) {
                        label5.setImageBitmap(synestesia);
                    }
                    if (label5.getDrawable() == null) {
                        label5.setImageBitmap(douala);
                    }
                }

                if (!head6.equals("")) {
                    RobotoTextView date_widget6 = (RobotoTextView) getActivity().findViewById(R.id.date06);
                    date_widget6.setText(date6);

                    RobotoTextView head_widget6 = (RobotoTextView) getActivity().findViewById(R.id.head06);
                    head_widget6.setText(head6);

                    RobotoTextView body_widget6 = (RobotoTextView) getActivity().findViewById(R.id.body6);
                    body_widget6.setText(body6);

                    ImageView label6 = (ImageView) getView().findViewById(R.id.label6);

                    if (head6.contains("BLACKWHITE")) {
                        label6.setImageBitmap(bwe);
                    }
                    if (date6.contains("Do")) {
                        label6.setImageBitmap(doualatag);
                    }
                    if (head6.contains("COMMAKLAR")) {
                        label6.setImageBitmap(commaklar);
                    }
                    if (head6.toLowerCase().contains("synestesia")) {
                        label6.setImageBitmap(synestesia);
                    }
                    if (label6.getDrawable() == null) {
                        label6.setImageBitmap(douala);
                    }
                }

            } catch (NullPointerException e) {
                e.printStackTrace();
            }
        }
    }
12
mike.b93

Ändern

 card01 = (LinearLayout) rootView.findViewById(R.id.card01);
 card02 = (LinearLayout) rootView.findViewById(R.id.card02);
 card03 = (LinearLayout) rootView.findViewById(R.id.card03);
 card04 = (LinearLayout) rootView.findViewById(R.id.card04);
 card05 = (LinearLayout) rootView.findViewById(R.id.card05);
 card06 = (LinearLayout) rootView.findViewById(R.id.card06);

Sie blasen ein Layout auf. die Ansichten gehören zum aufgeblasenen Layout. Verwenden Sie also das View-Objekt, um Ansichten in onCreateView zu initialisieren.

Fragment wird von einer Acitvity gehostet

Sie können getView in onActivityCreated verwenden und Ansichten initialisieren

Initialisieren Sie Ihre TextView's auch in onCreateView. Da Asynctask eine innere Klasse ist, können Sie die UI dort aktualisieren

Erklären

 RobotoTextView date_widget2;

als Instanzvariable

Dann in onCreateView

 date_widget2= (RobotoTextView) rootView.findViewById(R.id.date02);
12
Raghunandan

Sie rufen getView() zu früh an - es wird nur die Ansicht zurückgegeben, die Sie selbst von onCreateView() zurückgeben.

Verwenden Sie in onCreateView() die kürzlich aufgeblasene rootView anstelle von getView().

6
laalto

Die gleiche NullPointerException, die verursacht wird, während ich versuche, die Ansicht einer Komponente zu erweitern, kann aufgrund der Verwendung von LayoutInflater

View view = LayoutInflater.from(context).inflate(R.layout.layout_index_bar, null);
container = (LinearLayout) view.findViewById(R.id.indexContainer);
0
Wallace