在使用上下文菜单进行recyclerview时为空

我已经阅读了很多STACK问题并试图实现一切可能。但我一直收到为零在使用上下文菜单进行recyclerview时为空

AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;

没有什么似乎为我工作。尝试在长时间点击时获取物品在recyclerview中的位置。

public class CheckOutstandingPayment extends AppCompatActivity { 

ClsWebConnection oClsWeb = new ClsWebConnection(); 
DbConnection oDbCon; 
private String strLeadID; 
private ArrayList<String> arrayUniqueID = new ArrayList<>(); 
private ArrayList<String> arrayProdID = new ArrayList<>(); 
private ArrayList<String> arrayTotalAmt = new ArrayList<>(); 
private ArrayList<String> arrayOutstandAmt = new ArrayList<>(); 
private ArrayList<String> arrayProdName = new ArrayList<>(); 
private RecyclerView recyclerview; 

@Override 
protected void onCreate(Bundle savedInstanceState) { 
    super.onCreate(savedInstanceState); 
    setContentView(R.layout.activity_check_outstanding_payment); 

    if (android.os.Build.VERSION.SDK_INT > 9) { 
     StrictMode.ThreadPolicy policy = new StrictMode.ThreadPolicy.Builder() 
       .permitAll().build(); 
     StrictMode.setThreadPolicy(policy); 
    } 

    oDbCon = new DbConnection(getApplicationContext()); 

    Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
    setSupportActionBar(toolbar); 

    getSupportActionBar().setTitle("Payment History"); 

    recyclerview = (RecyclerView) findViewById(R.id.recyclerview); 
    LinearLayoutManager manager = new LinearLayoutManager(this); 
    recyclerview.setLayoutManager(manager); 
    recyclerview.addItemDecoration(new SimpleDividerItemDecoration(this)); 
    registerForContextMenu(recyclerview); 

    strLeadID = getIntent().getStringExtra("LeadID"); 

    if (strLeadID == null) { 
     strLeadID = DbConnection.strLeadID; 
    } 
    DisplayData(); 
} 

@Override 
protected void onResume() { 
    super.onResume(); 
    DisplayData(); 
} 

private void DisplayProduct() { 
    SQLiteDatabase db = oDbCon.getReadableDatabase(); 
    for (int i = 0; i < arrayProdID.size(); i++) { 
     Cursor prodCursor = db.rawQuery("SELECT PRODUCT_NAME FROM TBL_PRODUCT_MASTER WHERE PRODUCT_ID = '" + arrayProdID.get(i) + "'", null); 
     if (prodCursor.getCount() > 0) { 
      if (prodCursor.moveToFirst()) { 
       do { 
        arrayProdName.add(prodCursor.getString(prodCursor.getColumnIndex("PRODUCT_NAME"))); 
       } while (prodCursor.moveToNext()); 
      } 
     } 
     prodCursor.close(); 
     db.close(); 
    } 
} 

private void DisplayData() { 
    arrayUniqueID.clear(); 
    arrayProdID.clear(); 
    arrayTotalAmt.clear(); 
    arrayOutstandAmt.clear(); 
    arrayProdName.clear(); 

    if (ClsWebConnection.FunIsNetAvailable()) { 
     try { 
      String strGetData = oClsWeb.FunAddPayment1(DbConnection.strCustID, strLeadID); 
      if (!strGetData.equalsIgnoreCase("NA")) { 
       if (strGetData.contains("#")) { 
        String[] strHash = strGetData.split("#"); 
        for (String Ahash : strHash) { 
         String[] strComa = Ahash.split(","); 
         arrayUniqueID.add(strComa[0]); 
         arrayProdID.add(strComa[1]); 
         arrayTotalAmt.add(strComa[2]); 
         arrayOutstandAmt.add(strComa[3]); 

         DisplayProduct(); 
        } 
       } else { 
        String[] strComa = strGetData.split(","); 
        arrayUniqueID.add(strComa[0]); 
        arrayProdID.add(strComa[1]); 
        arrayTotalAmt.add(strComa[2]); 
        arrayOutstandAmt.add(strComa[3]); 

        DisplayProduct(); 
       } 
       RecyclerViewAdapter adapter = new RecyclerViewAdapter(getApplicationContext(), arrayUniqueID, arrayProdID, arrayTotalAmt, arrayOutstandAmt, arrayProdName); 
       recyclerview.setAdapter(adapter); 
      } else { 
       Toast.makeText(getApplicationContext(), "No data available", Toast.LENGTH_LONG).show(); 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
      Toast.makeText(getApplicationContext(), "Oops! Something went wrong... Try again later", Toast.LENGTH_SHORT).show(); 
     } 
    } else { 
     Toast.makeText(getApplicationContext(), "Internet not connected", Toast.LENGTH_LONG).show(); 
     finish(); 
    } 
} 

@Override 
public boolean onContextItemSelected(MenuItem item) { 
    AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo)item.getMenuInfo(); 
    int index = info.position; 
    switch (item.getItemId()) { 
     case 1: 
      Intent intent = new Intent(getApplicationContext(), AddPayment.class); 
      DbConnection.strProdID = arrayProdID.get(info.position); 
      DbConnection.strUniqueID = arrayUniqueID.get(info.position); 
      startActivity(intent); 
      break; 
     case 2: 
      Toast.makeText(getApplicationContext(), "2", Toast.LENGTH_SHORT).show(); 
      break; 
    } 
    return super.onContextItemSelected(item); 
} 

private class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolder> { 
    LayoutInflater inflater; 
    private Context context; 
    private ArrayList<String> arrayUniqueID = new ArrayList<>(); 
    private ArrayList<String> arrayProdID = new ArrayList<>(); 
    private ArrayList<String> arrayTotalAmt = new ArrayList<>(); 
    private ArrayList<String> arrayOutstandAmt = new ArrayList<>(); 
    private ArrayList<String> arrayProductName = new ArrayList<>(); 

    ContextMenu.ContextMenuInfo info; 

    public RecyclerViewAdapter(Context context, ArrayList<String> arrayUniqueID, ArrayList<String> arrayProdID, 
           ArrayList<String> arrayTotalAmt, ArrayList<String> arrayOutstandAmt, ArrayList<String> arrayProductName) { 
     this.context = context; 
     this.arrayUniqueID = arrayUniqueID; 
     this.arrayProdID = arrayProdID; 
     this.arrayTotalAmt = arrayTotalAmt; 
     this.arrayOutstandAmt = arrayOutstandAmt; 
     this.arrayProductName = arrayProductName; 
     inflater = LayoutInflater.from(context); 
    } 

    public RecyclerViewAdapter(){} 

    @Override 
    public RecyclerViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { 

     View layout = inflater.inflate(R.layout.payment_1_cell, null); 
     return new RecyclerViewHolder(layout); 
    } 

    @Override 
    public void onBindViewHolder(RecyclerViewHolder holder, int position) { 
     holder.total_amt.setText("Total: Rs. " + arrayTotalAmt.get(position)); 
     holder.outstanding_amt.setText("Outstanding: Rs. " + arrayOutstandAmt.get(position)); 
     holder.prod_name.setText(arrayProductName.get(position)); 

    } 

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

public class RecyclerViewHolder extends RecyclerView.ViewHolder implements View.OnCreateContextMenuListener, View.OnClickListener { 
    public TextView total_amt, outstanding_amt, prod_name; 
    public LinearLayout linearLayout; 

    public RecyclerViewHolder(View itemView) { 
     super(itemView); 
     itemView.setOnClickListener(this); 
     itemView.setOnCreateContextMenuListener(this); 
     total_amt = (TextView) itemView.findViewById(R.id.total_amt); 
     outstanding_amt = (TextView) itemView.findViewById(R.id.outstanding_amt); 
     prod_name = (TextView) itemView.findViewById(R.id.prod_name); 
     linearLayout = (LinearLayout) itemView.findViewById(R.id.linearLayout); 

    } 

    @Override 
    public void onClick(View v) { 
     Intent intent = new Intent(getApplicationContext(), AddPayment.class); 
     DbConnection.strProdID = arrayProdID.get(getLayoutPosition()); 
     DbConnection.strUniqueID = arrayUniqueID.get(getLayoutPosition()); 
     startActivity(intent); 
    } 

    @Override 
    public void onCreateContextMenu(ContextMenu menu, View v, ContextMenu.ContextMenuInfo menuInfo) { 
     AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo; 
     menu.setHeaderTitle("Select option"); 
     menu.add(0, 1, 0, "Add Payment"); 
     menu.add(0, 2, 0, "View Details"); 
    } 
    } 
}

堆栈跟踪在recyclerview下面提到当我选择任何选项项目上长按后

03-09 01:52:00.827 24201-24201/com.syncnetic.agentdetails E/AndroidRuntime: FATAL EXCEPTION: main 
                     Process: com.syncnetic.agentdetails, PID: 24201 
                     java.lang.NullPointerException: Attempt to read from field 'int android.widget.AdapterView$AdapterContextMenuInfo.position' on a null object reference 
                      at com.syncnetic.agentdetails.CheckOutstandingPayment.onContextItemSelected(CheckOutstandingPayment.java:140) 
                      at android.app.Activity.onMenuItemSelected(Activity.java:2905) 
                      at android.support.v4.app.FragmentActivity.onMenuItemSelected(FragmentActivity.java:361) 
                      at android.support.v7.app.AppCompatActivity.onMenuItemSelected(AppCompatActivity.java:147) 
                      at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:100) 
                      at android.support.v7.view.WindowCallbackWrapper.onMenuItemSelected(WindowCallbackWrapper.java:100) 
                      at com.android.internal.policy.impl.PhoneWindow$DialogMenuCallback.onMenuItemSelected(PhoneWindow.java:4701) 
                      at com.android.internal.view.menu.MenuBuilder.dispatchMenuItemSelected(MenuBuilder.java:761) 
                      at com.android.internal.view.menu.MenuItemImpl.invoke(MenuItemImpl.java:152) 
                      at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:904) 
                      at com.android.internal.view.menu.MenuBuilder.performItemAction(MenuBuilder.java:894) 
                      at com.android.internal.view.menu.MenuDialogHelper.onClick(MenuDialogHelper.java:167) 
                      at com.android.internal.app.AlertController$AlertParams$3.onItemClick(AlertController.java:1082) 
                      at android.widget.AdapterView.performItemClick(AdapterView.java:305) 
                      at android.widget.AbsListView.performItemClick(AbsListView.java:1146) 
                      at android.widget.AbsListView$PerformClick.run(AbsListView.java:3053) 
                      at android.widget.AbsListView$3.run(AbsListView.java:3860) 
                      at android.os.Handler.handleCallback(Handler.java:739) 
                      at android.os.Handler.dispatchMessage(Handler.java:95) 
                      at android.os.Looper.loop(Looper.java:135) 
                      at android.app.ActivityThread.main(ActivityThread.java:5254) 
                      at java.lang.reflect.Method.invoke(Native Method) 
                      at java.lang.reflect.Method.invoke(Method.java:372) 
                      at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
                      at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

来源

2016-03-09 Rahul Agrawal

如果发现错误，发布堆栈跟踪总是一个更好的习惯！ –

已添加stackTrace Shree Krishna。 –

专注于这一行'registerForContextMenu（recyclerview）;'， –

我终于设法得到所选择的项目ID作为你的要求。

在这一行

AdapterView.AdapterContextMenuInfo info = (AdapterView.AdapterContextMenuInfo) menuInfo;

menuinfo的情况下，将永远是null和它的多次报道，但仍然没有解决。我很难获得选定的列表项的位置，我会给你一些提示。

延长View.OnLongClickListener

public class ViewHolder extends RecyclerView.ViewHolder implements View.OnCreateContextMenuListener, View.OnClickListener, View.OnLongClickListener

内ViewHolder分配setOnLongClickListener

public ViewHolder(View v) { 
      super(v);    
      v.setOnCreateContextMenuListener(this); 
      v.setOnLongClickListener(this); 

     }

然后onLongClick看起来像这样

@Override 
     public boolean onLongClick(View v) {  
      recyclerViewClickListener.recyclerViewListClicked(this.getPosition()); 
      return false; 
     }

凡recyclerViewClickListener是界面和recyclerViewListClicked是一种方法

public interface RecyclerViewClickListener 
{  
    public int recyclerViewListClicked(int position); 
}

然后在您的活动创建globalVariable这应该是一类电平可变，并设置这看起来倍率方法内其值等

@Override 
    public int recyclerViewListClicked(int position) { 
     globalVariable = position; 
     return position; 
    }

接着后你可以使用globalVariable作为这里的选定项目位置

@Override 
    public boolean onContextItemSelected(MenuItem item) { 
     Log.d("mySelectedItem", ""+ globalVariable) //use the globalVariable as you need 

     return super.onContextItemSelected(item); 

    }

来源

2016-03-09 09:38:21

在使用上下文菜单进行recyclerview时为空

回答

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