'null android.view.View.getVisibility（）'null对象引用

问题描述：

我正在使用recyclerview并突然出现一个奇怪的错误。我尝试了一切，我可以。甚至放置断点。但它没有到达任何地方。列表中有数据。我尝试了所有StackOverFlow上可用的解决方案。它仍然不起作用，而且可用的解决方案是ListView。我正在使用recycerview，所以我无法获得解决方案。没有空值。我回收适配器如下：'null android.view.View.getVisibility（）'null对象引用

private class RecyclerAdapter extends RecyclerView.Adapter<RecyclerViewHolders> { 

    private Context context; 
    private ArrayList<Integer> arrayTarget = new ArrayList<>(); 
    private ArrayList<Integer> arrayAchievements = new ArrayList<>(); 
    private ArrayList<String> arrayAssociateName = new ArrayList<>(); 
    private ArrayList<String> arrayUserType = new ArrayList<>(); 
    private ArrayList<Integer> arrayAchievedGrp = new ArrayList<>(); 


    public RecyclerAdapter(Context c, ArrayList<Integer> arrayTarget, 
          ArrayList<String> arrayAssociateName, ArrayList<Integer> arrayAchievements, 
          ArrayList<String> arrayUserType, ArrayList<Integer> arrayAchievedGrp) { 
     this.context = c; 
     this.arrayTarget = arrayTarget; 
     this.arrayAchievements = arrayAchievements; 
     this.arrayAssociateName = arrayAssociateName; 
     this.arrayUserType = arrayUserType; 
     this.arrayAchievedGrp = arrayAchievedGrp; 

    } 


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

     return new RecyclerViewHolders(layout); 
    } 

    //this will attach the row at different positions 
    @Override 
    public void onBindViewHolder(RecyclerViewHolders mHolder, final int pos) { 

     mHolder.tv_AssociateName.setText(arrayAssociateName.get(pos).toUpperCase()); 
     mHolder.tv_target.setText(String.valueOf(arrayTarget.get(pos))); 
     mHolder.tv_achievements.setText(String.valueOf(arrayAchievements.get(pos))); 
     mHolder.tv_AssociateType.setText(" (" + arrayUserType.get(pos) + ")"); 
     mHolder.tv_achievedSraGrp.setText(String.valueOf(arrayAchievedGrp.get(pos))); 
     try { 
      percentage = (arrayAchievements.get(pos) * 100)/arrayTarget.get(pos); 
      if (percentage > 100) { 
       percentage = 100; 
      } 
     } catch (Exception e) { 
      e.printStackTrace(); 
      percentage = 0; 
     } 

     arrayPercentage.add(percentage); 
     mHolder.tv_percentage.setText(String.valueOf(percentage) + "%"); 

    } 

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

public class RecyclerViewHolders extends RecyclerView.ViewHolder implements View.OnClickListener { 

    TextView tv_AssociateName, tv_target, tv_achievements, tv_percentage, tv_AssociateType, tv_achievedSraGrp; 
    ImageButton ib_alertButton; 
    LinearLayout LL_achievedGrp; 

    public RecyclerViewHolders(View itemView) { 
     super(itemView); 
     itemView.setOnClickListener(this); 
     tv_AssociateName = (TextView) itemView.findViewById(R.id.tv_AssociateName); 
     tv_target = (TextView) itemView.findViewById(R.id.tv_target); 
     tv_achievements = (TextView) itemView.findViewById(R.id.tv_achievements); 
     tv_percentage = (TextView) itemView.findViewById(R.id.tv_percentage); 
     tv_AssociateType = (TextView) itemView.findViewById(R.id.tv_AssociateType); 
     tv_achievedSraGrp = (TextView) itemView.findViewById(R.id.tv_achievedSraGrp); 
     LL_achievedGrp = (LinearLayout) itemView.findViewById(R.id.LL_achievedGrp); 

     ib_alertButton = (ImageButton) itemView.findViewById(R.id.ib_alertButton); 
     ib_alertButton.setOnClickListener(new View.OnClickListener() { 
      @Override 
      public void onClick(View view) { 

       Toast.makeText(getApplicationContext(), "Coming Soon..", Toast.LENGTH_LONG).show(); 
      } 
     }); 

     if (mainUserType.equalsIgnoreCase("ASE")) { 
      LL_achievedGrp.setVisibility(View.VISIBLE); 
     } else { 
      LL_achievedGrp.setVisibility(View.GONE); 
     } 
    } 

    @Override 
    public void onClick(View v) { 
     Intent intent = new Intent(getApplicationContext(), AssociatesDashboard.class); 
     intent.putExtra("empCode", arrayAssociateEmpCd.get(getLayoutPosition())); //to open dashboard for this user 
     intent.putExtra("strActivityName", ActivityConstant.ASSOCIATE_LIST); 
     intent.putExtra("userType", callingUser); 

    } 
}

的构造函数被调用。但是，然后得到没有任何位置的错误。 logcat的如下：

FATAL EXCEPTION: main 
                      Process: com.mapmymarketing.salesscope, PID: 24220 
                      java.lang.NullPointerException: Attempt to invoke virtual method 'int android.view.View.getVisibility()' on a null object reference 
                       at android.widget.LinearLayout.forceUniformHeight(LinearLayout.java:1380) 
                       at android.widget.LinearLayout.measureHorizontal(LinearLayout.java:1368) 
                       at android.widget.TableRow.onMeasure(TableRow.java:114) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
                       at android.widget.TableLayout.measureChildBeforeLayout(TableLayout.java:464) 
                       at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
                       at android.widget.TableLayout.measureVertical(TableLayout.java:476) 
                       at android.widget.TableLayout.onMeasure(TableLayout.java:439) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 
                       at android.support.v7.widget.CardView.onMeasure(CardView.java:211) 
                       at android.view.View.measure(View.java:17547) 
                       at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:727) 
                       at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:463) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:706) 
                       at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90) 
                       at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1364) 
                       at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:771) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 
                       at android.view.View.measure(View.java:17547) 
                       at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1085) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 
                       at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:135) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
                       at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
                       at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1436) 
                       at android.widget.LinearLayout.measureVertical(LinearLayout.java:722) 
                       at android.widget.LinearLayout.onMeasure(LinearLayout.java:613) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5535) 
                       at android.widget.FrameLayout.onMeasure(FrameLayout.java:436) 
                       at com.android.internal.policy.impl.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2615) 
                       at android.view.View.measure(View.java:17547) 
                       at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2015) 
                       at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1173) 
                       at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1379) 
                       at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1061) 
                       at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:5885) 
                       at android.view.Choreographer$CallbackRecord.run(Choreographer.java:767) 
                      at android.vi

这是再循环器适配器行的XML：

<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" 
xmlns:app="http://schemas.android.com/apk/res-auto" 
android:id="@+id/ll_card" 
android:layout_width="match_parent" 
android:layout_height="wrap_content" 
android:layout_marginBottom="5dp" 
android:background="@color/white" 
android:orientation="vertical"> 

<android.support.v7.widget.CardView 
    android:id="@+id/CardView" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:background="@color/white" 
    android:paddingBottom="20dp" 
    android:paddingTop="20dp" 
    app:cardElevation="4dp"> 

    <LinearLayout 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:background="@color/white" 
     android:orientation="vertical"> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="5dp" 
      android:layout_marginStart="5dp" 
      android:layout_marginTop="5dp" 
      android:orientation="horizontal"> 

      <TextView 
       android:id="@+id/tv_AssociateName" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:padding="5dp" 
       android:text="Swaroop Pandey" 
       android:textColor="@color/black" 
       android:textSize="15sp" 
       android:textStyle="bold" /> 

      <TextView 
       android:id="@+id/tv_AssociateType" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="10dp" 
       android:layout_marginStart="10dp" 
       android:text="SO" 
       android:textColor="@color/PrimaryDark2" 
       android:textSize="15sp" 
       android:textStyle="bold" /> 

      <TextView 
       android:id="@+id/tv_percentage" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="10dp" 
       android:layout_marginRight="10dp" 
       android:gravity="end" 
       android:text="50 %" 
       android:textColor="@color/pink" 
       android:textSize="20sp" 
       android:textStyle="bold" /> 
     </LinearLayout> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginLeft="10dp" 
      android:layout_marginStart="10dp" 
      android:layout_marginTop="5dp" 
      android:orientation="horizontal"> 


      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginBottom="5dp" 
       android:text="Target - " 
       android:textColor="@color/black" 
       android:textSize="15sp" /> 

      <TextView 
       android:id="@+id/tv_target" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_marginBottom="5dp" 
       android:layout_marginLeft="10dp" 
       android:layout_marginStart="10dp" 
       android:text="10000" 
       android:textColor="@color/PrimaryDark2" 
       android:textSize="15sp" /> 
     </LinearLayout> 

     <LinearLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginBottom="5dp" 
      android:layout_marginLeft="10dp" 
      android:layout_marginStart="10dp" 
      android:orientation="horizontal"> 

      <TextView 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:text="Achievements - " 
       android:textColor="@color/black" 
       android:textSize="15sp" /> 

      <TextView 
       android:id="@+id/tv_achievements" 
       android:layout_width="wrap_content" 
       android:layout_height="wrap_content" 
       android:layout_marginLeft="10dp" 
       android:layout_marginStart="10dp" 
       android:text="5000" 
       android:textColor="@color/PrimaryDark2" 
       android:textSize="15sp" /> 
     </LinearLayout> 

     <RelativeLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:layout_marginBottom="5dp" 
      android:layout_marginLeft="10dp" 
      android:layout_marginStart="10dp"> 

      <LinearLayout 
       android:id="@+id/LL_achievedGrp" 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content" 
       android:layout_marginTop="5dp" 
       android:orientation="horizontal"> 

       <TextView 
        android:id="@+id/tv_text" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_marginBottom="5dp" 
        android:text="Achieved SRA Group - " 
        android:textColor="@color/black" 
        android:textSize="15sp" /> 

       <TextView 
        android:id="@+id/tv_achievedSraGrp" 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:text="3" 
        android:textColor="@color/PrimaryDark2" 
        android:textSize="15sp" /> 
      </LinearLayout> 

      <ImageButton 
       android:id="@+id/ib_alertButton" 
       android:layout_width="30dp" 
       android:layout_height="30dp" 
       android:layout_alignParentEnd="true" 
       android:layout_alignParentRight="true" 
       android:layout_marginEnd="10dp" 
       android:layout_marginRight="10dp" 
       android:background="@drawable/alert" /> 
     </RelativeLayout> 
    </LinearLayout> 
</android.support.v7.widget.CardView>

这是布局（主要布局），其含有的TableRow布局

<RelativeLayout 
    android:layout_width="match_parent" 
    android:layout_height="match_parent" 
    app:layout_behavior="@string/appbar_scrolling_view_behavior"> 

    <android.support.v7.widget.CardView 
     android:id="@+id/cardView2" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:elevation="5dp" 
     app:cardBackgroundColor="@color/background"> 

     <TableLayout 
      android:layout_width="match_parent" 
      android:layout_height="wrap_content" 
      android:padding="10dp"> 

      <TableRow 
       android:layout_width="match_parent" 
       android:layout_height="match_parent"> 

       <ImageView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_column="1" 
        android:layout_marginEnd="10dp" 
        android:layout_marginRight="10dp" 
        android:src="@drawable/blue_ring" /> 

       <TextView 
        android:layout_width="0dp" 
        android:layout_height="wrap_content" 
        android:layout_column="2" 
        android:layout_weight="3.5" 
        android:text="Total Associates" 
        android:textColor="@color/white" 
        android:textSize="15sp" /> 

       <TextView 
        android:id="@+id/tv_totalTarget" 
        android:layout_width="0dp" 
        android:layout_height="match_parent" 
        android:layout_column="3" 
        android:layout_weight="1" 
        android:gravity="end|center" 
        android:text="3000" 
        android:textColor="@color/white" 
        android:textSize="15sp" /> 

       <TextView 
        android:layout_width="0dp" 
        android:layout_height="match_parent" 
        android:layout_column="4" 
        android:layout_marginLeft="10dp" 
        android:layout_marginRight="10dp" 
        android:layout_weight="1" 
        android:gravity="end|center" 
        android:text="100%" 
        android:textColor="#8b8ce6" 
        android:textSize="15sp" /> 
      </TableRow> 

      <View 
       android:layout_width="match_parent" 
       android:layout_height="1dp" 
       android:layout_marginBottom="5dp" 
       android:layout_marginTop="10dp" 
       android:background="#30ffffff" /> 

      <TableRow 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 

       <ImageView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_column="1" 
        android:layout_marginEnd="10dp" 
        android:layout_marginRight="10dp" 
        android:src="@drawable/green_ring" /> 

       <TextView 
        android:layout_width="0dp" 
        android:layout_height="wrap_content" 
        android:layout_column="2" 
        android:layout_weight="3.5" 
        android:text="Associate achieved upto 5 group" 
        android:textColor="@color/white" 
        android:textSize="15sp" /> 

       <TextView 
        android:id="@+id/tv_totalAchievements" 
        android:layout_width="0dp" 
        android:layout_height="match_parent" 
        android:layout_column="3" 
        android:layout_weight="1" 
        android:gravity="end|center" 
        android:text="1500" 
        android:textColor="@color/Primary" 
        android:textSize="15sp" /> 

       <TextView 
        android:id="@+id/tv_achievementsPercentage" 
        android:layout_width="0dp" 
        android:layout_height="match_parent" 
        android:layout_column="4" 
        android:layout_marginLeft="10dp" 
        android:layout_marginRight="10dp" 
        android:layout_weight="1" 
        android:gravity="end|center" 
        android:text="50%" 
        android:textColor="#51e4ca" 
        android:textSize="15sp" /> 
      </TableRow> 

      <View 
       android:layout_width="match_parent" 
       android:layout_height="1dp" 
       android:layout_marginBottom="5dp" 
       android:layout_marginTop="10dp" 
       android:background="#30ffffff" /> 

      <TableRow 
       android:layout_width="match_parent" 
       android:layout_height="wrap_content"> 

       <ImageView 
        android:layout_width="wrap_content" 
        android:layout_height="wrap_content" 
        android:layout_column="1" 
        android:layout_marginEnd="10dp" 
        android:layout_marginRight="10dp" 
        android:src="@drawable/orange_ring" /> 

       <TextView 
        android:layout_width="0dp" 
        android:layout_height="wrap_content" 
        android:layout_column="2" 
        android:layout_weight="3.5" 
        android:text="Associates achieved less than 5 group" 
        android:textColor="@color/white" 
        android:textSize="15sp" /> 

       <TextView 
        android:id="@+id/tv_totalGap" 
        android:layout_width="0dp" 
        android:layout_height="match_parent" 
        android:layout_column="3" 
        android:layout_weight="1" 
        android:gravity="end|center" 
        android:text="1500" 
        android:textColor="@color/Primary" 
        android:textSize="15sp" /> 

       <TextView 
        android:id="@+id/tv_gapPercentage" 
        android:layout_width="0dp" 
        android:layout_height="match_parent" 
        android:layout_column="4" 
        android:layout_marginLeft="10dp" 
        android:layout_marginRight="10dp" 
        android:layout_weight="1" 
        android:gravity="end|center" 
        android:text="50%" 
        android:textColor="#ed9178" 
        android:textSize="15sp" /> 
      </TableRow> 
     </TableLayout> 
    </android.support.v7.widget.CardView> 

    <android.support.v7.widget.RecyclerView 
     android:id="@+id/AssociateList" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/cardView2" 
     android:layout_marginLeft="10dp" 
     android:layout_marginRight="10dp" 
     android:layout_marginTop="10dp" /> 

    <TextView 
     android:id="@+id/no_data_available" 
     android:layout_width="match_parent" 
     android:layout_height="wrap_content" 
     android:layout_below="@+id/cardView2" 
     android:layout_gravity="center" 
     android:gravity="center" 
     android:padding="10dp" 
     android:text="No Data Available" 
     android:textColor="@color/white" 
     android:visibility="gone" /> 
</RelativeLayout>

我重新打开了这个问题。我不认为将此作为“如何修复空指针异常”的重复是有用的。从堆栈跟踪中可以清楚地看到，OP没有在'null'对象引用上调用任何方法。 Android框架正在调用'null'对象引用的方法，OP需要帮助来理解原因。 –

请发布相关的布局XML。 –

Hi @DavidWasser我已经发布了回收行的xml。请检查，请 –

答

我在主布局中删除了TableRow布局，并将其替换为线性布局。我不知道错误的原因。我会仔细看看的。一旦我得到正确的解决方案，我将编辑并提交正确答案。

非常感谢！你节省了我很多时间。 – DmitryKanunnikoff

有解决方案！适用于我。看看这个答案：http://stackoverflow.com/a/28649642/2075349 – DmitryKanunnikoff

答

我有同样的问题，我只取出android:layout_column=""，和它的工作。原因我后面不知道

'null android.view.View.getVisibility（）'null对象引用

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