仮想メソッドを呼び出そうとしました
LinearLayoutsでonCreateViewを取得しようとしていますが、次のメッセージが表示されてアプリがクラッシュします。
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
コードは次のとおりです。
@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;
}
これは純粋なFragmentクラスです。このActivityを呼び出すFragmentには、このFragmentが含まれていません。私は間違っていますか？ Fragmentは常にActivity内にあるべきですか？
要求されたように、AsyncTask全体：
// 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();
}
}
}
への変更
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);
レイアウトを膨らませます。ビューは膨張したレイアウトに属します。したがって、ビューオブジェクトを使用してonCreateViewのビューを初期化します。
フラグメントはAcitvityによってホストされています
getViewでonActivityCreatedを使用して、ビューを初期化できます
TextViewもonCreateViewで初期化します。 Asynctaskは内部クラスなので、そこでUIを更新できます
宣言する
RobotoTextView date_widget2;
インスタンス変数として
次にonCreateViewで
date_widget2= (RobotoTextView) rootView.findViewById(R.id.date02);
getView()の呼び出しが早すぎます-onCreateView()から自分で返すビューのみを返します。
onCreateView()の内部では、getView()の代わりに最近膨張したrootViewを使用します。
コンポーネントのビューを拡張しようとしているときに発生した同じNullPointerExceptionは、LayoutInflaterの使用が原因である可能性があります。
View view = LayoutInflater.from(context).inflate(R.layout.layout_index_bar, null);
container = (LinearLayout) view.findViewById(R.id.indexContainer);