如何将数据从fragment（包含recyclerview）传输到对话框片段，在对话框片段中显示所选项目，在我的情况下，我收到错误。
这是RecyclerViewCollegeNewsLetter.java，
public class RecyclerViewCollegeNewsLetter extends RecyclerView.Adapter<RecyclerViewCollegeNewsLetter.MyCollege> {
static List<Topics> topicses = new ArrayList<>();
Context context;
Topics topics;
public RecyclerViewCollegeNewsLetter(Context context, ArrayList<Topics> topicses) {
this.context = context;
this.topicses = topicses;
}
@Override
public RecyclerViewCollegeNewsLetter.MyCollege onCreateViewHolder(ViewGroup parent, int viewType) {
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.recycler_row, parent, false);
Log.d("ssss", "in oncreate");
return new MyCollege(view);
}
@Override
public void onBindViewHolder(final RecyclerViewCollegeNewsLetter.MyCollege holder, final int position) {
topics = topicses.get(position);
holder.id.setText(topics.getId());
holder.givenby.setText(topics.getGivenby());
holder.article.setText(topics.getArticle());
holder.more.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
FilterDialogFragment filterDialogFragment = new FilterDialogFragment();
int pos=holder.getAdapterPosition();
Bundle bundle = new Bundle();
bundle.putString("more_id",topicses.get(pos).getId() );
Log.e("rrrr",topicses.get(pos).getId());
bundle.putString("more_given_by",topicses.get(pos).getGivenby());
bundle.putString("more_article", topicses.get(pos).getArticle());
bundle.putString("more_content", topicses.get(pos).getContent());
//pasing data to filterDialogFragment
filterDialogFragment.setArguments(bundle);
showDialog();
}
});
// holder.content.setText(topics.getContent());
if (topics.getContent().length() > 100) {
holder.content.setText((topics.getContent().substring(0, 99)) + "...");
} else
holder.content.setText(topics.getContent());
}
@Override
public int getItemCount() {
return topicses.size();
}
public class MyCollege extends RecyclerView.ViewHolder {
TextView id, content, article, givenby;
Button more;
public MyCollege(View itemView) {
super(itemView);
id = (TextView) itemView.findViewById(R.id.id);
givenby = (TextView) itemView.findViewById(R.id.givenby);
article = (TextView) itemView.findViewById(R.id.article);
content = (TextView) itemView.findViewById(R.id.content);
more = (Button) itemView.findViewById(R.id.more);
}
}
void showDialog() {
FilterDialogFragment filterDialogFragment = new FilterDialogFragment();
// MoreDetails moreDetails = new MoreDetails();
FragmentManager ft = ((MainActivity) context).getSupportFragmentManager();
DialogFragment newFragment = filterDialogFragment.newInstance();
newFragment.show(ft, "dialog");
}
这是FilterDialogFragment.java
public class FilterDialogFragment extends DialogFragment {
private AdView mAdView;
Bundle mArgs;
TextView more_id, more_content, more_article, more_givenby;
static FilterDialogFragment newInstance() {
FilterDialogFragment f = new FilterDialogFragment();
return f;
}
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
View v = inflater.inflate(R.layout.more_details, container, false);
mAdView = (AdView) v.findViewById(R.id.adView);
more_id = (TextView) v.findViewById(R.id.more_id);
more_content = (TextView) v.findViewById(R.id.more_content);
more_article = (TextView) v.findViewById(R.id.more_article);
more_givenby = (TextView) v.findViewById(R.id.more_givenby);
return v;
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
AdRequest adRequest = new AdRequest.Builder()
.build();
mAdView.loadAd(adRequest);
Bundle mArgs = getArguments();
more_id.setText(mArgs.getString("more_id"));
}
@Override
public void onPause() {
if (mAdView != null) {
mAdView.pause();
}
super.onPause();
}
@Override
public void onResume() {
super.onResume();
if (mAdView != null) {
mAdView.resume();
}
}
@Override
public void onDestroy() {
if (mAdView != null) {
mAdView.destroy();
}
super.onDestroy();
}
@Override
public void onStart() {
super.onStart();
Dialog dialog = getDialog();
if (dialog != null) {
int width = ViewGroup.LayoutParams.MATCH_PARENT;
int height = ViewGroup.LayoutParams.MATCH_PARENT;
dialog.getWindow().setLayout(width, height);
}
}
我把Bundle mArgs = getArguments（）;
more_id.setText（mArgs.getString（ “more_id”））;
onActivityCreated中的但是给了我错误： -
java.lang.NullPointerException: Attempt to invoke virtual method 'java.lang.String android.os.Bundle.getString(java.lang.String)' on a null object reference
at com.example.kulde.itechvcet.FilterDialogFragment.onViewCreated(FilterDialogFragment.java:52)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1314)
at android.support.v4.app.FragmentManagerImpl.moveFragmentToExpectedState(FragmentManager.java:1528)
at android.support.v4.app.FragmentManagerImpl.moveToState(FragmentManager.java:1595)
at android.support.v4.app.BackStackRecord.executeOps(BackStackRecord.java:758)
at android.support.v4.app.FragmentManagerImpl.executeOps(FragmentManager.java:2363)
at android.support.v4.app.FragmentManagerImpl.executeOpsTogether(FragmentManager.java:2149)
at android.support.v4.app.FragmentManagerImpl.optimizeAndExecuteOps(FragmentManager.java:2103)
at android.support.v4.app.FragmentManagerImpl.execPendingActions(FragmentManager.java:2013)
at android.support.v4.app.FragmentManagerImpl$1.run(FragmentManager.java:710)
at android.os.Handler.handleCallback(Handler.java:739)
at android.os.Handler.dispatchMessage(Handler.java:95)
at android.os.Looper.loop(Looper.java:152)
at android.app.ActivityThread.main(ActivityThread.java:5497)
at java.lang.reflect.Method.invoke(Native Method)
at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:726)
at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:616)
帮我Pro Devs！
答案 0 :(得分：0)
检查并在FilterDialogFragment.java中使用。
string data = "DwRktl1y8st4k11pSxy2tE9kJMiNlIgV6Gu9ekY8ia2QtoGbdiaiemHeQJ+2MGTZmRKM0IGsiXQyqvXLx/t47FcXmwzZPayS3i6mmYD+qFibbcmA5lGI1uIjT7FSgLM9Xi9QBnTMjIwIEmv6tQaKGGTbhwvUuaP7hek57Xnlk+9CCarkkDlGLed5y+6GedXED0KgMcW1rqXLH7EQub+KzQ==";
byte[] arrb = Convert.FromBase64String(data);
string decodedString = Encoding.UTF8.GetString(arrb);
const string key = "AbcNtByIGI1BpgcsAG8GZl8pdwwxyz";
RijndaelManaged aes = new RijndaelManaged();
aes.KeySize = 256;
aes.BlockSize = 256;
aes.Padding = PaddingMode.None;
aes.Mode = CipherMode.ECB;
aes.GenerateIV();
ICryptoTransform decryptor = aes.CreateDecryptor(Encoding.UTF8.GetBytes(key), aes.IV);
MemoryStream ms = new MemoryStream(Encoding.UTF8.GetBytes(decodedString.Trim()));
CryptoStream cs = new CryptoStream(ms, decryptor, CryptoStreamMode.Read);
StreamReader sr = new StreamReader(cs);
user_data = sr.ReadToEnd();
答案 1 :(得分：0)
您正在为FilterDialogFragment设置包值，但您没有使用它，因为您在showDialog（）方法中创建了一个新的FilterDialogFragment实例
FilterDialogFragment filterDialogFragment = new FilterDialogFragment();
int pos=holder.getAdapterPosition();
Bundle bundle = new Bundle();
bundle.putString("more_id",topicses.get(pos).getId() );
Log.e("rrrr",topicses.get(pos).getId());
bundle.putString("more_given_by",topicses.get(pos).getGivenby());
bundle.putString("more_article", topicses.get(pos).getArticle());
bundle.putString("more_content", topicses.get(pos).getContent());
//pasing data to filterDialogFragment
filterDialogFragment.setArguments(bundle);
showDialog(filterDialogFragment);
传递FilterDialogFragment变量
void showDialog(FilterDialogFragment ff) {
// MoreDetails moreDetails = new MoreDetails();
FragmentManager ft = ((MainActivity) context).getSupportFragmentManager();
DialogFragment newFragment = ff.newInstance();
newFragment.show(ft, "dialog");
}
您没有将任何值传递给DialogFragment并尝试检索实际不存在的more_id键的值。
Bundle mArgs = getArguments();
more_id.setText(mArgs.getString("more_id"));
按以下方式更改您的实施
static FilterDialogFragment newInstance(String moreId) {
FilterDialogFragment f = new FilterDialogFragment();
Bundle bundle = new Bundle();
bundle.putSTring("more_id", moreId);
f.setArguments(bundle);
return f;
}
并在调用DialogFragment
时相应地更改代码