当从另一个 fragment 接收到值时，我不知道如何在第二个 fragment 的 TextView 中设置。我在第二个 fragment 中收到的数据是 StringList 的 "value" 对象，但我现在不知道如何为其设置数据。
字符串列表类:
public class StringList {
public String authorName;
public String headline;
public String publishedTime;
public String newsDetail;
}
主要 Activity :
//only useful code pasted below for tranfering thre value from fragment to another fragment and i have implemented the TransferValue to the mainActivity
public void sendValue(StringList value, int positionValue) {
FragmentTransaction transaction = frag.beginTransaction();
BusinessDetail businessDetail = new BusinessDetail();
businessDetail.receiveValue(value, positionValue);
transaction.replace(R.id.content_frame, businessDetail);
transaction.commit();
}
fragment 1:
public class Business extends Fragment {
public List<StringList> businessNews = new ArrayList<>();
TransferValue SendData;//here
private RecyclerView recyclerView;
public Business() {
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_business, container, false);
recyclerView = (RecyclerView) view.findViewById(R.id.business_recycler_view);
FetchLists f = new FetchLists();
f.execute(10, 0);
return view;
}
@Override
public void onCreate(@Nullable Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
}
@Override
public void onAttach(Context context) {
super.onAttach(context);
//here
try {
SendData = (TransferValue) context;
} catch (ClassCastException e) {
Log.d("ashu", "implement the methods");
throw new ClassCastException("implemented the methods");
}
}
//here
public interface TransferValue {
public void sendValue(StringList value, int positionValue);
}
public class FetchLists extends AsyncTask<Integer, Void, List<StringList>> {
@Override
protected List<StringList> doInBackground(Integer... params) {
int count = params[0];
int offset = params[1];
//api key changed
String urlString = "https://newspi.og/v1/article?source=bloomerg&sortBy=tp&apiKey=5fdfd54f4aba5a5fdfvdf476ff528a8";
urlString = urlString + "&count=" + count + "&offset=" + offset;
try {
URL url = new URL(urlString);
HttpURLConnection connection = (HttpURLConnection) url.openConnection();
connection.setRequestMethod("GET");
InputStream stream = connection.getInputStream();
BufferedReader reader = new BufferedReader(new InputStreamReader(stream));
String line = reader.readLine();
String response = "";
while (line != null) {
response += line;
line = reader.readLine();
}
JSONObject object = new JSONObject(response);
JSONArray emailLists = object.getJSONArray("articles");
for (int i = 0; i < emailLists.length(); i++) {
JSONObject listData = (JSONObject) emailLists.get(i);
StringList stringList = new StringList();
stringList.authorName = listData.getString("author");
stringList.headline = listData.getString("title");
stringList.publishedTime = listData.getString("publishedAt");
stringList.newsDetail = listData.getString("description");
businessNews.add(stringList);
}
} catch (Exception e) {
e.printStackTrace();
}
return businessNews;
}
@Override
protected void onPostExecute(List<StringList> result) {
super.onPostExecute(result);
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
BusinessAdapter adapter = new BusinessAdapter(Business.this, result);
recyclerView.setAdapter(adapter);
}
}
public class BusinessAdapter extends RecyclerView.Adapter<BusinessHolder> {
int prevposition = 0;
private List<StringList> c;
public BusinessAdapter(Business context, List<StringList> result) {
c = context.businessNews;
}
@Override
public BusinessHolder onCreateViewHolder(ViewGroup parent, int viewType) {
Context context = parent.getContext();
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
View view = inflater.inflate(R.layout.layout_news, parent, false);
return new BusinessHolder(view);
}
@Override
public void onBindViewHolder(BusinessHolder holder, int position) {
StringList m = c.get(position);
holder.bindListName(m, position);
@Override
public int getItemCount() {
return c.size();
}
}
public class BusinessHolder extends RecyclerView.ViewHolder {
public TextView headlineTextview;
public TextView authorTextview;
public TextView timeTextview;
public BusinessHolder(View itemView) {
super(itemView);
headlineTextview = (TextView) itemView.findViewById(R.id.id_headline);
authorTextview = (TextView) itemView.findViewById(R.id.id_author);
timeTextview = (TextView) itemView.findViewById(R.id.id_time);
}
public void bindListName(final StringList stringList, final int position) {
headlineTextview.setText(stringList.headline);
authorTextview.setText(stringList.authorName);
timeTextview.setText(stringList.publishedTime);
itemView.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View view) {
BusinessDetail s = new BusinessDetail();
FragmentTransaction transaction = getFragmentManager().beginTransaction();
transaction.replace(R.id.content_frame, s);
transaction.addToBackStack(null);
transaction.commit();
} });}}}}
fragment 2:
public class BusinessDetail extends Fragment {
Bundle bundle;
private TextView headlineSecond;
private TextView authorSecond;
private TextView detailsSecond;
private List<StringList> s;
public BusinessDetail() {
}
public void receiveValue(StringList value, int positionValue) {
bundle = new Bundle();
bundle.putString("news", value.authorName);
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View view = inflater.inflate(R.layout.fragment_business_detail, container, false);
headlineSecond = (TextView) view.findViewById(R.id.id_headline_second);
authorSecond = (TextView) view.findViewById(R.id.id_author_second);
detailsSecond = (TextView) view.findViewById(R.id.id_details_second);
// I want to set the values received to the textview here
return view;}}
最佳答案
您可以使用 Parcelable 将任何自定义类数据的数组列表从一个 Activity/fragment 发送到下一个 Activity/fragment 。
在前面的 fragment 中，使用 putParcelableArrayList 方法将数据添加到包中。例如
bundle.putParcelableArrayList("KEY_NAME",arrayName);
在下一个 frgament 中使用 getParcelableArrayList 方法在 onCreate 中获取该数据。
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
if (getArguments() != null) {
ArrayList<Item> itemArray = getArguments().getParcelableArrayList("KEY_NAME");
}
}
最主要的是将您的 StringList 类更改为 Parcelable。对于 Parcelable 类示例，请单击下面的链接..
关于android - 如何为从另一个 fragment 接收到的 fragment 的 TextView 设置值？，我们在Stack Overflow上找到一个类似的问题： https://stackoverflow.com/questions/43424281/