Вызвано: java.lang.NullPointerException: -...... на ссылке нулевого объекта

Question

Ошибка Вызвано: java.lang.NullPointerException: попытка вызвать виртуальный метод void android.widget.RelativeLayout. setOnClickListener (android.view.View $ OnClickListener)»на нулевой ссылки на объект

моя Ява

package com.doctorfinderapp.doctorfinder; 

import android.content.Intent; 
import android.os.Bundle; 
import android.support.design.widget.FloatingActionButton; 
import android.support.design.widget.Snackbar; 
import android.support.v7.app.AppCompatActivity; 
import android.support.v7.widget.Toolbar; 
import android.view.View; 
import android.widget.RelativeLayout; 

public class DoctorProfileActivity extends AppCompatActivity { 



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

     //get data from previous activity 
     Toolbar toolbar = (Toolbar) findViewById(R.id.toolbar); 
     setSupportActionBar(toolbar); 

     FloatingActionButton fab = (FloatingActionButton) findViewById(R.id.fab); 
     fab.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 
       Snackbar.make(view, "Invia una mail a Dottore", Snackbar.LENGTH_LONG) 
         .setAction("Action", null).show(); 


      } 
     }); 

     //vado sul feed 
     RelativeLayout feedback = (RelativeLayout) findViewById(R.id.feedback); 
     feedback.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View v) { 
       Intent intent = new Intent(DoctorProfileActivity.this, FeedbackItemActivity.class); 
       startActivity(intent); 
      } 
     }); 
    } 

} 

XML-код, где объявляется функция "функция обратной"

<?xml version="1.0" encoding="utf-8"?> 
<android.support.v4.widget.NestedScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
    xmlns:app="http://schemas.android.com/apk/res-auto" 
    xmlns:tools="http://schemas.android.com/tools" 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    android:layout_marginTop="@dimen/activity_horizontal_margin" 
    android:padding="@dimen/activity_horizontal_margin" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior" 
    tools:context="com.letsnurture.ln_202.coordinatorlayoutpart1.ScrollingActivity" 
    tools:showIn="@layout/activity_scrolling"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" 
     android:weightSum="1"> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="74dp" 
      android:background="?attr/selectableItemBackground" 
      android:clickable="true" 
      android:padding="@dimen/activity_horizontal_margin" 
      android:layout_weight="0.61"> 

      <ImageView 
       android:id="@+id/ivContactItem1" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerVertical="true" 
       android:layout_marginEnd="@dimen/activity_horizontal_margin" 
       android:layout_marginRight="@dimen/activity_horizontal_margin" 
       android:src="@drawable/ic_account_circle_black_24dp" /> 

      <TextView 
       android:id="@+id/tvNumber1" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_toEndOf="@id/ivContactItem1" 
       android:layout_toRightOf="@id/ivContactItem1" 
       android:text="Lorenzo Gitto" 
       android:textAppearance="@style/TextAppearance.AppCompat.Medium" 
       android:textColor="#212121" /> 


      <ToggleButton 
       android:id="@+id/chkState1" 
       android:layout_width="24dp" 
       android:layout_height="24dp" 
       android:layout_alignParentEnd="true" 
       android:layout_alignParentRight="true" 
       android:layout_centerVertical="true" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:background="@drawable/ic_account_circle_white_24dp" 
       android:checked="true" 
       android:padding="6dp" 
       android:textOff="" 
       android:textOn="" /> 

     </RelativeLayout> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="?attr/selectableItemBackground" 
      android:clickable="true" 
      android:padding="@dimen/activity_horizontal_margin"> 

      <ImageView 
       android:id="@+id/ivContactItem2" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerVertical="true" 
       android:layout_marginEnd="@dimen/activity_horizontal_margin" 
       android:layout_marginRight="@dimen/activity_horizontal_margin" 
       android:src="@drawable/ic_info_black_24dp" 
       android:visibility="visible" /> 

      <TextView 
       android:id="@+id/tvNumber2" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_toEndOf="@id/ivContactItem2" 
       android:layout_toRightOf="@id/ivContactItem2" 
       android:text="Chirurgia Toracica" 
       android:textAppearance="@style/TextAppearance.AppCompat.Medium" 
       android:textColor="#212121" /> 

      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/tvNumber2" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_marginTop="8dp" 
       android:layout_toEndOf="@id/ivContactItem2" 
       android:layout_toRightOf="@id/ivContactItem2" 
       android:text="Chirurgia Vascolare" 
       android:textAppearance="@style/TextAppearance.AppCompat.Small" 
       android:textColor="#727272" /> 

      <ToggleButton 
       android:id="@+id/chkState2" 
       android:layout_width="24dp" 
       android:layout_height="24dp" 
       android:layout_alignParentEnd="true" 
       android:layout_alignParentRight="true" 
       android:layout_centerVertical="true" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:background="@drawable/ic_info_white_24dp" 
       android:checked="false" 
       android:padding="6dp" 
       android:textOff="" 
       android:textOn="" /> 

     </RelativeLayout> 

     <include layout="@layout/item_divider" /> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="?attr/selectableItemBackground" 
      android:clickable="true" 
      android:padding="@dimen/activity_horizontal_margin"> 

      <ImageView 
       android:id="@+id/ivContactItem3" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerVertical="true" 
       android:layout_marginEnd="@dimen/activity_horizontal_margin" 
       android:layout_marginRight="@dimen/activity_horizontal_margin" 
       android:src="@drawable/ic_book_black_24dp" /> 

      <TextView 
       android:id="@+id/tvNumber3" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_toEndOf="@id/ivContactItem3" 
       android:layout_toLeftOf="@+id/chkState3" 
       android:layout_toRightOf="@id/ivContactItem3" 
       android:layout_toStartOf="@+id/chkState3" 
       android:ellipsize="end" 
       android:maxLines="1" 
       android:text="Anni di esperienza: " 
       android:textAppearance="@style/TextAppearance.AppCompat.Medium" 
       android:textColor="#212121" /> 

      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/tvNumber3" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_marginTop="8dp" 
       android:layout_toEndOf="@id/ivContactItem3" 
       android:layout_toRightOf="@id/ivContactItem3" 
       android:text="11" 
       android:textAppearance="@style/TextAppearance.AppCompat.Small" 
       android:textColor="#727272" /> 

      <ToggleButton 
       android:id="@+id/chkState3" 
       android:layout_width="24dp" 
       android:layout_height="24dp" 
       android:layout_alignParentEnd="true" 
       android:layout_alignParentRight="true" 
       android:layout_centerVertical="true" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:background="@drawable/ic_info_white_24dp" 
       android:checked="true" 
       android:padding="6dp" 
       android:textOff="" 
       android:textOn="" /> 

     </RelativeLayout> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="?attr/selectableItemBackground" 
      android:clickable="true" 
      android:padding="@dimen/activity_horizontal_margin"> 

      <ImageView 
       android:id="@+id/ivContactItem4" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerVertical="true" 
       android:layout_marginEnd="@dimen/activity_horizontal_margin" 
       android:layout_marginRight="@dimen/activity_horizontal_margin" 
       android:src="@drawable/ic_explore_black_24dp" 
       android:visibility="visible" /> 

      <TextView 
       android:id="@+id/tvNumber4" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_toEndOf="@id/ivContactItem4" 
       android:layout_toLeftOf="@+id/chkState4" 
       android:layout_toRightOf="@id/ivContactItem4" 
       android:layout_toStartOf="@+id/chkState4" 
       android:ellipsize="end" 
       android:maxLines="1" 
       android:text="Luogo di lavoro" 
       android:textAppearance="@style/TextAppearance.AppCompat.Medium" 
       android:textColor="#212121" /> 

      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/tvNumber4" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_marginTop="8dp" 
       android:layout_toEndOf="@id/ivContactItem4" 
       android:layout_toRightOf="@id/ivContactItem4" 
       android:text="Via del Porto, 21" 
       android:textAppearance="@style/TextAppearance.AppCompat.Small" 
       android:textColor="#727272" /> 

      <ToggleButton 
       android:id="@+id/chkState4" 
       android:layout_width="24dp" 
       android:layout_height="24dp" 
       android:layout_alignParentEnd="true" 
       android:layout_alignParentRight="true" 
       android:layout_centerVertical="true" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:background="@drawable/ic_info_white_24dp" 
       android:padding="6dp" 
       android:textOff="" 
       android:textOn="" /> 

     </RelativeLayout> 

     <include layout="@layout/item_divider" /> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="?attr/selectableItemBackground" 
      android:clickable="true" 
      android:onClick="feedbackfunction" 
      android:padding="@dimen/activity_horizontal_margin"> 

      <ImageView 
       android:id="@+id/ivContactItem5" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerVertical="true" 
       android:layout_marginEnd="@dimen/activity_horizontal_margin" 
       android:layout_marginRight="@dimen/activity_horizontal_margin" 
       android:src="@drawable/ic_exit_to_app_white_24dp" /> 

      <TextView 
       android:id="@+id/tvNumber5" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_toEndOf="@id/ivContactItem5" 
       android:layout_toLeftOf="@+id/chkState5" 
       android:layout_toRightOf="@id/ivContactItem5" 
       android:layout_toStartOf="@+id/chkState5" 
       android:ellipsize="end" 
       android:maxLines="1" 
       android:text="Punteggio Feedback" 
       android:clickable="true" 
       android:textAppearance="@style/TextAppearance.AppCompat.Medium" 
       android:textColor="#212121" 
       /> 

      <ToggleButton 
       android:id="@+id/chkState5" 
       android:layout_width="24dp" 
       android:layout_height="24dp" 
       android:layout_alignParentEnd="true" 
       android:layout_alignParentRight="true" 
       android:layout_centerVertical="true" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:background="@drawable/ic_book_white_24dp" 
       android:checked="true" 
       android:padding="6dp" 
       android:textOff="" 
       android:textOn="" /> 

     </RelativeLayout> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:background="?attr/selectableItemBackground" 
      android:clickable="true" 
      android:padding="@dimen/activity_horizontal_margin"> 

      <ImageView 
       android:id="@+id/ivContactItem6" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_centerVertical="true" 
       android:layout_marginEnd="@dimen/activity_horizontal_margin" 
       android:layout_marginRight="@dimen/activity_horizontal_margin" 
       android:src="@drawable/ic_book_black_24dp" 
       android:visibility="visible" /> 

      <TextView 
       android:id="@+id/tvNumber6" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_toEndOf="@id/ivContactItem6" 
       android:layout_toLeftOf="@+id/chkState6" 
       android:layout_toRightOf="@id/ivContactItem6" 
       android:layout_toStartOf="@+id/chkState6" 
       android:ellipsize="end" 
       android:maxLines="1" 
       android:text="Ulteriori info" 
       android:textAppearance="@style/TextAppearance.AppCompat.Medium" 
       android:textColor="#212121" /> 

      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_below="@id/tvNumber6" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:layout_marginTop="8dp" 
       android:layout_toEndOf="@id/ivContactItem6" 
       android:layout_toRightOf="@id/ivContactItem6" 
       android:maxLines="10" 
       android:text="Vai Su linkedin per vedere le mie info e competenze...http://www.linkedin.com/NomeDottore " 
       android:textAppearance="@style/TextAppearance.AppCompat.Small" 
       android:textColor="#727272" /> 

      <ToggleButton 
       android:id="@+id/chkState6" 
       android:layout_width="24dp" 
       android:layout_height="24dp" 
       android:layout_alignParentEnd="true" 
       android:layout_alignParentRight="true" 
       android:layout_centerVertical="true" 
       android:layout_marginLeft="@dimen/activity_horizontal_margin" 
       android:layout_marginStart="@dimen/activity_horizontal_margin" 
       android:background="@drawable/ic_exit_to_app_white_24dp" 
       android:padding="6dp" 
       android:textOff="" 
       android:textOn="" /> 

     </RelativeLayout> 

     <include layout="@layout/item_divider" /> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:orientation="vertical" 
      android:padding="@dimen/activity_horizontal_margin"> 

      <Button 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="Prenota appuntamento" 
       /> 

      <Button 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginBottom="@dimen/activity_horizontal_margin" 
       android:layout_marginTop="@dimen/activity_horizontal_margin" 
       android:text="Videochiama" 
       /> 
     </LinearLayout> 
    </LinearLayout> 

</android.support.v4.widget.NestedScrollView> 

Может кто-нибудь мне помочь? Благодаря всем

Answer 1

Вы не имеете RelativeLayout с идентификатором равным обратной связи.

RelativeLayout feedback = (RelativeLayout) findViewById(R.id.feedback); 

Так вам объект обратной связи является недействительным и вы не можете выполнить OnClick событие на нулевой объект

Решение

Установите RelativeLayout ID = обратная связь

Answer 2

Похоже, вы не устанавливая @id для этого RelativeLayout:

android:id="@+id/feedback"