我想从这个片段访问另一个片段之外的布局的视图。这就是为什么我得到NullPointerException。
我该如何解决？
public class Pacijenti_fragment extends Fragment {
//this is the JSON Data URL
public final static String MESSAGE_KEY= "com.example.android.app";
//a list to store all the products
List<Pacijent> pacijentList;
String id="";
String ID="";
//the recyclerview
RecyclerView recyclerView;
private SearchView searchView;
private PacijentiAdapter adapter;
Button btnPogled;
@Override
public View onCreateView(LayoutInflater inflater, ViewGroup container,
Bundle savedInstanceState) {
// Inflate the layout for this fragment
final View view=inflater.inflate(R.layout.pacijenti_fragment, container, false);
//getting the recyclerview from xml
recyclerView = (RecyclerView)view.findViewById(R.id.recylcerView);
recyclerView.setHasFixedSize(true);
recyclerView.addItemDecoration(new MyDividerItemDecoration(getActivity(), DividerItemDecoration.VERTICAL, 36));
recyclerView.setLayoutManager(new LinearLayoutManager(getActivity()));
//initializing the productlist
pacijentList = new ArrayList<>();
btnPogled=(Button)findViewById(R.id.btnDodaj); //here i make my button
Bundle b=getArguments();
this.id=b.getString("id");
System.out.println(id);
ID = this.id;
btnPogled.setOnClickListener(new View.OnClickListener(){ //here i get null pointer
@Override
public void onClick(View v) {
OnPogled();
}
});
//this method will fetch and parse json
//to display it in recyclerview
loadPacijenti();
return view;
}
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical">
<RelativeLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:padding="8dp">
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="@+id/GornjiLayout"
>
<TextView
android:id="@+id/textViewName"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:text="Jane"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Small"
android:textColor="#000000" />
<TextView
android:id="@+id/textViewSurname"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="5dp"
android:layout_toRightOf="@id/textViewName"
android:text="Doe"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Small"
android:textColor="#000000"/>
</LinearLayout>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:id="@+id/SredjiLayout"
android:layout_below="@id/GornjiLayout"
>
<TextView
android:id="@+id/textViewDateOfBirth"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/textViewName"
android:layout_marginLeft="5dp"
android:layout_marginRight="150dp"
android:layout_marginTop="5dp"
android:text="21.05.1989"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Small"
android:textStyle="bold" />
<Button
android:id="@+id/buttonDodaj"
android:layout_width="120dp"
android:layout_height="wrap_content"
android:text="Otvori" />
</LinearLayout>
<TextView
android:id="@+id/textViewAdress"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_below="@id/SredjiLayout"
android:layout_marginLeft="5dp"
android:layout_marginTop="5dp"
android:text="Some street 45, UnknownVille"
android:textAppearance="@style/Base.TextAppearance.AppCompat.Small"
android:textStyle="bold" />
</RelativeLayout>
</LinearLayout>
我不知道如何从片段访问其他xml。这个xml是单独的文件，因为它与我编写的特定适配器一起进入了recyclerview。而且此按钮必须位于该回收站视图内，因为每个按钮都应传递db中每个人的ID。
答案 0 :(得分：0)
只需更改findviewById的一行即可。
btnPogled=(Button)findViewById(R.id.btnDodaj)
到
btnPogled=(Button)view.findViewById(R.id.btnDodaj)
答案 1 :(得分：0)
好吧，我明白了，所以基本上您想做的是从回收者视图中的另一个xml访问一个按钮，只需引用此代码，并在oncreate视图持有人内部的适配器类中进行所有更改，以指定您将从中访问按钮的xml文件：
public class ManagerTaskListAdapter extends RecyclerView.Adapter<ManagerTaskListAdapter.ProjectViewHolder> {
private ArrayList<Taskmsg> dataList;
private ArrayList<Project> projects;
Context mContext;
public ManagerTaskListAdapter(ArrayList<Taskmsg> dataList, Context mContext) {
this.dataList = dataList;
this.mContext=mContext;
}
@Override
public ProjectViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
LayoutInflater layoutInflater = LayoutInflater.from(parent.getContext());
View view = layoutInflater.inflate(R.layout.man_task_list_item, parent, false);
return new ProjectViewHolder(view);
}
@Override
public void onBindViewHolder(ProjectViewHolder holder, int position) {
String fname=dataList.get(position).getEmpFirstName();
String lname=dataList.get(position).getEmpLastName();
String prdesc=dataList.get(position).getTaskDescription();
String pid= dataList.get(position).getProjectId().toString();
String em=dataList.get(position).getTaskCreatedBy();
String taskid=dataList.get(position).getTaskId().toString();
prdesc = prdesc.replaceAll("\\<.*?\\>", "");
holder.txttname.setText(dataList.get(position).getTaskName());
holder.txttdesc.setText(prdesc);
holder.txttaskcrt.setText(dataList.get(position).getTaskCreatedBy());
holder.txtempname.setText(fname +" "+ lname);
holder.itemView.setOnClickListener(v -> {
Intent in=new Intent(mContext,TaskDetails.class);
in.putExtra("tid",taskid);
in.putExtra("pid",pid);
in.putExtra("email",em);
mContext.startActivity(in);
});
}
@Override
public int getItemCount() {
return dataList.size();
}
class ProjectViewHolder extends RecyclerView.ViewHolder {
TextView txttname,txttdesc,txtempname,txttaskcrt;
ProjectViewHolder(View itemView) {
super(itemView);
txttname = (TextView) itemView.findViewById(R.id.tv_taskname);
txttaskcrt=itemView.findViewById(R.id.tv_taskcreatedby);
txttdesc = (TextView) itemView.findViewById(R.id.tv_taskdescription);
txtempname = (TextView) itemView.findViewById(R.id.tv_empname);
}
}
}