setOnItemClickListenerでインテントを呼び出すときにエラーが発生するRecyclerView

Question

Upcoming.javaをMeetingDetails.javaに設定しようとしています。私はすでにOnItemClickListenerの内部でトーストしようとすると、それは動作しますが、私はインテントしようとするとエラーが発生します。

FATAL EXCEPTION: main 
Process: com.example.erice.attendancecontroller, PID: 1358 
java.lang.NullPointerException: Attempt to invoke virtual method 'android.app.ActivityThread$ApplicationThread android.app.ActivityThread.getApplicationThread()' on a null object reference 
        at com.example.erice.attendancecontroller.Upcoming$1.onItemClicked(Upcoming.java:65) 
        at com.example.erice.attendancecontroller.MeetingListClickSupport$1.onClick(MeetingListClickSupport.java:20) 

：Upcoming.Java

mAdapter = new MeetingsAdapter(meetingList); 
RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext()); 
    recyclerView.setLayoutManager(mLayoutManager); 
    recyclerView.addItemDecoration(new MeetingDivider(this, LinearLayoutManager.VERTICAL)); 
    recyclerView.setItemAnimator(new DefaultItemAnimator()); 
    recyclerView.setAdapter(mAdapter); 

    MeetingListClickSupport.addTo(recyclerView).setOnItemClickListener(new MeetingListClickSupport.OnItemClickListener() { 
     @Override 
     public void onItemClicked(RecyclerView recyclerView, int position, View v) { 
      Meeting meeting = meetingList.get(position); 
      Intent i = new Intent(getApplicationContext() , MeetingDetails.class); 
      i.putExtra("id", meeting.getId()); 
      i.putExtra("status", "U"); 
      startActivity(i); 
     } 
    }); 

MeetingListClickSupport.java

@Override 
    public void onClick(View v) { 
     if (mOnItemClickListener != null) { 
      RecyclerView.ViewHolder holder = mRecyclerView.getChildViewHolder(v); 
      mOnItemClickListener.onItemClicked(mRecyclerView, holder.getAdapterPosition(), v); 
     } 
    } 

MeetingsAdapter.java

private List<Meeting> meetingsList; 

public class MyViewHolder extends RecyclerView.ViewHolder { 
    public TextView mName, description; 

    public MyViewHolder(View view) { 
     super(view); 
     mName = (TextView) view.findViewById(R.id.mName); 
     description = (TextView) view.findViewById(R.id.description); 
    } 
} 

public MeetingsAdapter(List<Meeting> meetingsList) { 
    this.meetingsList = meetingsList; 
} 

@Override 
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 
    View itemView = LayoutInflater.from(parent.getContext()) 
      .inflate(R.layout.activity_meeting_list, parent, false); 

    return new MyViewHolder(itemView); 
} 

@Override 
public void onBindViewHolder(MyViewHolder holder, int position) { 
    Meeting meeting = meetingsList.get(position); 
    holder.mName.setText(meeting.getName()); 
    holder.description.setText(meeting.getDescription()); 
} 

@Override 
public int getItemCount() { 
    return meetingsList.size(); 
} 

は、私はこのようなエラーが発生しました

してください誰も私を助けることができるならば、

RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(getApplicationContext()); 

あなたのこの行では非常に多くの

Answer 1

をありがとうあなたの通過getApplicationContext()あなたはActivitycontextを渡す必要があります。

使用この

RecyclerView.LayoutManager mLayoutManager = new LinearLayoutManager(this); 

はその後RecycleView.Adapterクラスのコンストラクタを作成します。あなたのOnClick使用中の今

public MeetingsAdapter : RecyclerView.Adapter 
{ 
    Activity context; 

    public MeetingsAdapter(Activity context) 
     { 
      this.context = context; 
     } 
} 

このよう

Intent i = new Intent(context , MeetingDetails.class);