Nesne başvurusu, bir nesnenin örneğine ayarlandığında, Xamarin Android TextView'ı, fragmanrt'tan fragmanrt'a yerleştirmeye çalışırken

Bir parçacığımdan bir TextView başvurusu yapmaya çalıştığımda System.NullReferenceException: Object reference not set to an instance of an object hatasını alıyorum. Çalışma zamanında oluyor.Nesne başvurusu, bir nesnenin örneğine ayarlandığında, Xamarin Android TextView'ı, fragmanrt'tan fragmanrt'a yerleştirmeye çalışırken

Fragment

public class Fragment1 : Fragment 
{ 
    private int checkNumber = 0; 
    private string[] updateTitleArray = new string[10]; 
    private string[] updateBodyArray = new string[10]; 
    private TextView updatesTitle0; 
    private TextView updatesTitle1; 
    private TextView updatesTitle2; 
    private TextView updatesTitle3; 
    private TextView updatesTitle4; 
    private TextView updatesTitle5; 
    private TextView updatesTitle6; 
    private TextView updatesTitle7; 
    private TextView updatesTitle8; 
    private TextView updatesTitle9; 

    private TextView updateBody0; 
    private TextView updateBody1; 
    private TextView updateBody2; 
    private TextView updateBody3; 
    private TextView updateBody4; 
    private TextView updateBody5; 
    private TextView updateBody6; 
    private TextView updateBody7; 
    private TextView updateBody8; 
    private TextView updateBody9; 



    public override void OnCreate(Bundle savedInstanceState) 
    { 
     base.OnCreate(savedInstanceState); 
     fillUpdates(updateTitleArray, updateBodyArray); 
    } 

    public static Fragment1 NewInstance() 
    { 
     var frag1 = new Fragment1 { Arguments = new Bundle() }; 
     return frag1; 
    } 


    public override View OnCreateView(LayoutInflater inflater, ViewGroup container, Bundle savedInstanceState) 
    { 
     var ignored = base.OnCreateView(inflater, container, savedInstanceState); 
     return inflater.Inflate(Resource.Layout.fragment1, null); 
    } 

    public void fillUpdates(string[] updatetitlearray, string[] updatebodyarray) 
    { 
     //increment1 so if block skips here 
     checkNumber = 1; 

     //fill updatesArray 
     updateTitleArray = updatetitlearray; 
     updateBodyArray = updatebodyarray; 

     updatesTitle0 = View.FindViewById<TextView>(Resource.Id.update_title0); 
     updatesTitle1 = View.FindViewById<TextView>(Resource.Id.update_title1); 
     updatesTitle2 = View.FindViewById<TextView>(Resource.Id.update_title2); 
     updatesTitle3 = View.FindViewById<TextView>(Resource.Id.update_title3); 
     updatesTitle4 = View.FindViewById<TextView>(Resource.Id.update_title4); 
     updatesTitle5 = View.FindViewById<TextView>(Resource.Id.update_title5); 
     updatesTitle6 = View.FindViewById<TextView>(Resource.Id.update_title6); 
     updatesTitle7 = View.FindViewById<TextView>(Resource.Id.update_title7); 
     updatesTitle8 = View.FindViewById<TextView>(Resource.Id.update_title8); 
     updatesTitle9 = View.FindViewById<TextView>(Resource.Id.update_title9); 

     updateBody0 = View.FindViewById<TextView>(Resource.Id.update_body0); 
     updateBody1 = View.FindViewById<TextView>(Resource.Id.update_body1); 
     updateBody2 = View.FindViewById<TextView>(Resource.Id.update_body2); 
     updateBody3 = View.FindViewById<TextView>(Resource.Id.update_body3); 
     updateBody4 = View.FindViewById<TextView>(Resource.Id.update_body4); 
     updateBody5 = View.FindViewById<TextView>(Resource.Id.update_body5); 
     updateBody6 = View.FindViewById<TextView>(Resource.Id.update_body6); 
     updateBody7 = View.FindViewById<TextView>(Resource.Id.update_body7); 
     updateBody8 = View.FindViewById<TextView>(Resource.Id.update_body8); 
     updateBody9 = View.FindViewById<TextView>(Resource.Id.update_body9); 


     updatesTitle0.Text = updateTitleArray[0].ToString(); 
     updatesTitle1.Text = updateTitleArray[1].ToString(); 
     updatesTitle2.Text = updateTitleArray[2].ToString(); 
     updatesTitle3.Text = updateTitleArray[3].ToString(); 
     updatesTitle4.Text = updateTitleArray[4].ToString(); 
     updatesTitle5.Text = updateTitleArray[5].ToString(); 
     updatesTitle6.Text = updateTitleArray[6].ToString(); 
     updatesTitle7.Text = updateTitleArray[7].ToString(); 
     updatesTitle8.Text = updateTitleArray[8].ToString(); 
     updatesTitle9.Text = updateTitleArray[9].ToString(); 

     updateBody0.Text = updateBodyArray[0].ToString(); 
     updateBody1.Text = updateBodyArray[1].ToString(); 
     updateBody2.Text = updateBodyArray[2].ToString(); 
     updateBody3.Text = updateBodyArray[3].ToString(); 
     updateBody4.Text = updateBodyArray[4].ToString(); 
     updateBody5.Text = updateBodyArray[5].ToString(); 
     updateBody6.Text = updateBodyArray[6].ToString(); 
     updateBody7.Text = updateBodyArray[7].ToString(); 
     updateBody8.Text = updateBodyArray[8].ToString(); 
     updateBody9.Text = updateBodyArray[9].ToString(); 
    } 
}

Görünüm

<ScrollView xmlns:android="http://schemas.android.com/apk/res/android" 
     android:layout_width="fill_parent" 
     android:layout_height="wrap_content" 
     android:orientation="vertical" 
     android:padding="10dp" 
     android:fillViewport="false"> 
     <LinearLayout 
      android:orientation="vertical" 
      android:layout_width="fill_parent" 
      android:layout_height="fill_parent"> 
     <!--Cardview 1--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:minHeight="60dp" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title0" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body0" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shownbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbbb Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--card view2--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title1" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body1" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--cardview 3--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title2" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body2" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--card view 4--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title3" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body3" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--card view 5--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title4" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body4" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--card view 6--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title5" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body5" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--card view 7--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title6" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body6" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--card view 8--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title7" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body7" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--card view 9--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title8" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body8" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     <!--card view 10--> 
      <android.support.v7.widget.CardView xmlns:card_view="http://schemas.android.com/apk/res-auto" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       card_view:cardElevation="8dp" 
       card_view:cardCornerRadius="8dp" 
       android:layout_marginLeft="8dp" 
       android:layout_marginRight="8dp" 
       android:layout_marginTop="8dp"> 
       <GridLayout 
        android:minWidth="25px" 
        android:minHeight="25px" 
        android:layout_width="match_parent" 
        android:layout_height="wrap_content" 
        android:columnCount="3" 
        android:rowCount="1"> 
        <LinearLayout 
         android:orientation="vertical" 
         android:layout_gravity="fill" 
         android:layout_row="0" 
         android:layout_column="0" 
         android:padding="16sp"> 
         <TextView 
          android:id="@+id/update_title9" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update 1" 
          android:padding="4sp" 
          android:textSize="24sp" 
          android:textColor="@color/primaryText" /> 
         <TextView 
          android:id="@+id/update_body9" 
          android:layout_width="wrap_content" 
          android:layout_height="wrap_content" 
          android:text="Update Details Is Shown Here" 
          android:padding="4sp" 
          android:textSize="16sp" /> 
        </LinearLayout> 
       </GridLayout> 
      </android.support.v7.widget.CardView> 
     </LinearLayout> 
    </ScrollView>

ben recycler manzaralı uygulanabilir elde etmek ne çalışıyorum anlıyorum ama tam olarak anlaşılamamış olması, bu çünkü ben yeni başlayan bir programcıyım.

kaynak

2016-04-09 Vincent N.

Size çok erken işlev diyorsunuz. OnCreate, OnCreateView'dan önce çağrılır. Bu, düzen bileşenlerine erişmeye çalıştığınızda, görünümlerinizin oluşturulmadığı anlamına gelir. fillUpdates aramanızı OnStart (veya OnCreateView veya OnCreateView'den sonra çağrılan başka bir yaşam döngüsü yöntemi) olarak taşımanız gerekir. yanıtlarken için Frament Lifecycle

public override void OnStart(Bundle bundle) 
{ 
    base.OnStart(bundle); 
    fillUpdates(updateTitleArray, updateBodyArray); 
}

kaynak

2016-04-09 12:42:23

teşekkür göz at . Bunu deneyeceğim. Bir kez daha çok teşekkürler –

Merhaba, ben dizi dizileri ayarlamaya çalışıyorum dize dizileri değerler atamaz bulundu. Metin. Değerler boş. Bu ayrıca yukarıdaki hatayı atar –

Nesne başvurusu, bir nesnenin örneğine ayarlandığında, Xamarin Android TextView'ı, fragmanrt'tan fragmanrt'a yerleştirmeye çalışırken

cevap

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