应用程序在滚动展开列表视图时随机崩溃

问题描述：

我一直在我的应用程序中回收视图，滚动它会崩溃，而不是在任何特定的使用情况下..它只是随机崩溃。以下是我的适配器和View Holder代码。应用程序在滚动展开列表视图时随机崩溃

class CustomListView_Base_Adapter extends BaseExpandableListAdapter { 

    Context context; 
    private LayoutInflater inflater = null; 

    public CustomListView_Base_Adapter(Context context) { 
     this.inflater = LayoutInflater.from(context); 
     this.context = context; 

    } 

    @Override 
    public int getGroupCount() { 
     return dataforSubcategoryItem.size(); 
    } 

    @Override 
    public int getChildrenCount(int groupPosition) { 
     return 1; 
    } 

    @Override 
    public Object getGroup(int groupPosition) { 
     return dataforSubcategoryItem.get(groupPosition); 
    } 

    @Override 
    public Object getChild(int groupPosition, int childPosition) { 
     return dataforSubcategoryItem.get(groupPosition); 
    } 

    @Override 
    public long getGroupId(int groupPosition) { 
     return groupPosition; 
    } 

    @Override 
    public long getChildId(int groupPosition, int childPosition) { 
     return childPosition; 
    } 

    @Override 
    public boolean hasStableIds() { 
     return false; 
    } 

    @Override 
    public View getGroupView(final int groupPosition, boolean isExpanded, View convertView, ViewGroup parent) { 
     View resultView = convertView; 
     final ViewHolder holder; 

     if (resultView == null) { 
      resultView = inflater.inflate(R.layout.add_subcategory_list_item, null); //TODO change layout id 
      holder = new ViewHolder(resultView); 
      resultView.setTag(holder); 
     } else { 
      holder = (ViewHolder) resultView.getTag(); 
     } 
     final SubcategoryItemBean beanObj = (SubcategoryItemBean) getGroup(groupPosition); 
     holder.tvColumnTitle.setText(beanObj.getName()); 
     holder.checkBox.setOnCheckedChangeListener(null); 


     CustomWatcher oldWatcher = (CustomWatcher) holder.etInput.getTag(); 
     if (oldWatcher != null) 
      holder.etInput.removeTextChangedListener(oldWatcher); 

     if (beanObj.isColumnSelected()) { 
      holder.checkBox.setChecked(true); 
      holder.etInput.setText(dataforSubcategoryItem.get(groupPosition).getLabel()); 
      holder.etInput.setEnabled(true); 
      listView.expandGroup(groupPosition); 
     } else { 
      holder.checkBox.setChecked(false); 
      holder.etInput.setText(""); 
      holder.etInput.setEnabled(false); 
      listView.collapseGroup(groupPosition); 
     } 


     CustomWatcher newWatcher = new CustomWatcher(groupPosition, holder.etInput); 
     holder.etInput.setTag(newWatcher); 
     holder.etInput.addTextChangedListener(newWatcher); 
     holder.checkBox.setOnCheckedChangeListener(new CompoundButton.OnCheckedChangeListener() { 
      @Override 
      public void onCheckedChanged(CompoundButton buttonView, boolean isChecked) { 
       if (isChecked) { 
        dataforSubcategoryItem.get(groupPosition).setColumnSelected(true); 
       } else { 
        dataforSubcategoryItem.get(groupPosition).setColumnSelected(false); 

       } 
       notifyDataSetChanged(); 
      } 
     }); 


     return resultView; 
    } 

    @Override 
    public View getChildView(final int groupPosition, final int childPosition, boolean isLastChild, View convertView, ViewGroup parent) { 
     View resultView = convertView; 
     final ViewHolder holder; 


     if (resultView == null) { 
      resultView = inflater.inflate(R.layout.child_list_item, null); //TODO change layout id 
      holder = new ViewHolder(resultView, context); 
      resultView.setTag(holder); 
     } else { 
      holder = (ViewHolder) resultView.getTag(); 
     } 
     final SubcategoryItemBean beanObj = (SubcategoryItemBean) getChild(groupPosition, childPosition); 
     CustomWatcher oldWatcher = (CustomWatcher) holder.defaultValues.getTag(); 
     if (oldWatcher != null) 
      holder.defaultValues.removeTextChangedListener(oldWatcher); 
     holder.radiogroup.setOnCheckedChangeListener(null); 

     holder.defaultValues.setText(beanObj.getValue()); 
     if (beanObj.getInput_type().equalsIgnoreCase(getString(R.string.column_type_text))) { 
      holder.defaultValues.setInputType(InputType.TYPE_CLASS_TEXT); 
      holder.defaultValues.setHint("Enter Default Value"); 
      holder.rbText.setChecked(true); 
     } else if (beanObj.getInput_type().equalsIgnoreCase(getString(R.string.column_type_number))) { 
      holder.defaultValues.setInputType(InputType.TYPE_CLASS_NUMBER); 
      holder.defaultValues.setHint("Enter Default Value"); 
      holder.rbNumber.setChecked(true); 
     } else if (beanObj.getInput_type().equalsIgnoreCase(getString(R.string.column_type_radiobutton))) { 
      holder.defaultValues.setInputType(InputType.TYPE_CLASS_TEXT); 
      holder.defaultValues.setHint("Enter comma separated values"); 
      holder.rbRadioButton.setChecked(true); 
     } else if (beanObj.getInput_type().equalsIgnoreCase(getString(R.string.column_type_checkbox))) { 
      holder.rbCheckbox.setChecked(true); 
      holder.defaultValues.setHint("Enter comma separated values"); 

      holder.defaultValues.setInputType(InputType.TYPE_CLASS_TEXT); 
     } else { 
      holder.rbDropdown.setChecked(true); 
      holder.defaultValues.setHint("Enter comma separated values"); 
      holder.defaultValues.setInputType(InputType.TYPE_CLASS_TEXT); 
     } 


     holder.radiogroup.setOnCheckedChangeListener(new RadioGroup.OnCheckedChangeListener() { 
      @Override 
      public void onCheckedChanged(RadioGroup group, @IdRes int checkedId) { 
       RadioButton button = (RadioButton) group.findViewById(group.getCheckedRadioButtonId()); 
       dataforSubcategoryItem.get(groupPosition).setInput_type(button.getText().toString()); 
       holder.defaultValues.setText(""); 
       notifyDataSetChanged(); 

      } 
     }); 

     CustomWatcher newWatcher = new CustomWatcher(groupPosition, holder.defaultValues); 
     holder.defaultValues.setTag(newWatcher); 
     holder.defaultValues.addTextChangedListener(newWatcher); 
     return resultView; 
    } 

    @Override 
    public boolean isChildSelectable(int groupPosition, int childPosition) { 
     return false; 
    } 

    private class CustomWatcher implements TextWatcher { 
     private int position; 
     private EditText editText; 

     private CustomWatcher(int position, EditText editText) { 
      this.position = position; 
      this.editText = editText; 
     } 

     @Override 
     public void beforeTextChanged(CharSequence charSequence, int i, int i1, int i2) { 

     } 

     @Override 
     public void onTextChanged(CharSequence charSequence, int i, int i1, int i2) { 

     } 

     @Override 
     public void afterTextChanged(Editable editable) { 
      if (editText.getId() == R.id.addCategory_chooseItem_EditText) { 
       dataforSubcategoryItem.get(position).setLabel(editable.toString().trim()); 
       System.out.println("CustomWatcher.onTextChanged label" + editable.toString()); 
      } 
      if (editText.getId() == R.id.defaultValues_addSubCategory_chooseItem) { 
       dataforSubcategoryItem.get(position).setValue(editable.toString().trim()); 
       System.out.println("CustomWatcher.afterTextChanged default value " + editable.toString()); 
      } 

     } 
    } 
} 


class ViewHolder { 

    CheckBox checkBox; 
    TextView tvColumnTitle; 
    EditText etInput; 
    RadioGroup radiogroup; 
    RadioButton rbText, rbNumber, rbRadioButton, rbCheckbox, rbDropdown; 
    EditText defaultValues; 
    LinearLayout columnDetailsLayout; 

    public ViewHolder(View view) { 
     checkBox = (CheckBox) view.findViewById(R.id.addCategory_chooseItem_Checkbox); 
     tvColumnTitle = (TextView) view.findViewById(R.id.addCategory_chooseItem_TextView); 
     etInput = (EditText) view.findViewById(R.id.addCategory_chooseItem_EditText); 
    } 

    public ViewHolder(View view, Context context) { 
     columnDetailsLayout = (LinearLayout) view.findViewById(R.id.columnDetailsLayout); 
     radiogroup = (RadioGroup) view.findViewById(R.id.radiogroup_addSubCategory_chooseItem); 
     rbText = (RadioButton) view.findViewById(R.id.rbText_addSubCategory_chooseItem); 
     rbNumber = (RadioButton) view.findViewById(R.id.rbNumber_addSubCategory_chooseItem); 
     rbRadioButton = (RadioButton) view.findViewById(R.id.rbRadioButton_addSubCategory_chooseItem); 
     rbCheckbox = (RadioButton) view.findViewById(R.id.rbCheckbox_addSubCategory_chooseItem); 
     rbDropdown = (RadioButton) view.findViewById(R.id.rbDropdown_addSubCategory_chooseItem); 

     defaultValues = (EditText) view.findViewById(R.id.defaultValues_addSubCategory_chooseItem); 

     rbText.setChecked(true); 
    } 


}

这是输出：

这是后应用进行了崩溃

E/AndroidRuntime: FATAL EXCEPTION: main 
                        Process: global.edios.inventorymanagementtabletapp, PID: 2927 
                        java.lang.NullPointerException: Attempt to invoke virtual method 'void android.graphics.drawable.Drawable.setBounds(android.graphics.Rect)' on a null object reference 
                         at android.widget.ExpandableListView.drawDivider(ExpandableListView.java:536) 
                         at android.widget.ListView.dispatchDraw(ListView.java:3288) 
                         at android.widget.ExpandableListView.dispatchDraw(ExpandableListView.java:353) 
                         at android.view.View.draw(View.java:15234) 
                         at android.widget.AbsListView.draw(AbsListView.java:4110) 
                         at android.view.View.updateDisplayListIfDirty(View.java:14167) 
                         at android.view.View.getDisplayList(View.java:14189) 
                         at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3389) 
                         at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3368) 
                         at android.view.View.updateDisplayListIfDirty(View.java:14127) 
                         at android.view.View.getDisplayList(View.java:14189) 
                         at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3389) 
                         at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3368) 
                         at android.view.View.updateDisplayListIfDirty(View.java:14127) 
                         at android.view.View.getDisplayList(View.java:14189) 
                         at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3389) 
                         at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3368) 
                         at android.view.View.updateDisplayListIfDirty(View.java:14127) 
                         at android.view.View.getDisplayList(View.java:14189) 
                         at android.view.ViewGroup.recreateChildDisplayList(ViewGroup.java:3389) 
                         at android.view.ViewGroup.dispatchGetDisplayList(ViewGroup.java:3368) 
                         at android.view.View.updateDisplayListIfDirty(View.java:14127) 
                         at android.view.View.getDisplayList(View.java:14189) 
                         at android.view.ThreadedRenderer.updateViewTreeDisplayList(ThreadedRenderer.java:273) 
                         at android.view.ThreadedRenderer.updateRootDisplayList(ThreadedRenderer.java:279) 
                         at android.view.ThreadedRenderer.draw(ThreadedRenderer.java:318) 
                         at android.view.ViewRootImpl.draw(ViewRootImpl.java:2530) 
                         at android.view.ViewRootImpl.performDraw(ViewRootImpl.java:2352) 
                         at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1982) 
                         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.view.Choreographer.doCallbacks(Choreographer.java:580) 
                         at android.view.Choreographer.doFrame(Choreographer.java:550) 
                         at android.view.Choreographer$FrameDisplayEventReceiver.run(Choreographer.java:753) 
                         at android.os.Handler.handleCallback(Handler.java:739) 
                         at android.os.Handler.dispatchMessage(Handler.java:95) 
                         at android.os.Looper.loop(Looper.java:135) 
                         at android.app.ActivityThread.main(ActivityThread.java:5254) 
                         at java.lang.reflect.Method.invoke(Native Method) 
                         at java.lang.reflect.Method.invoke(Method.java:372) 
                         at com.android.internal.os.ZygoteInit$MethodAndArgsCaller.run(ZygoteInit.java:903) 
                         at com.android.internal.os.ZygoteInit.main(ZygoteInit.java:698)

请帮助我得到的错误。谢谢。

可能的复制[什么是空指针异常，以及如何解决？（http://*.com/questions/218384/what-is-a-nullpointerexception-and-我怎么办 - 修复它） –

答

Heyy文本守望者，应用程序是由于坠毁在展开视图中使用分频器..我删除从扩展列表分频器和

<ExpandableListView 
    android:id="@+id/listView" 
    android:layout_width="match_parent" 
    android:layout_height="wrap_content" 
    android:layout_below="@+id/layout_SelectAll" 
    android:background="@color/colorWhite" 
    android:divider="@null" 
    android:groupIndicator="@null" 
    android:paddingBottom="70dp" 
    />

添加自定义视图，而不是分隔

问题解决了:)

答

由于可扩展列表视图和调用文本监视器，发生此故障。并使用多个Text Watcher作为父项和子项。另外你甚至改变无线电组。

尝试改变别的东西

感谢您的建议..tr ied，但没有真正的工作 – ManishNegi

应用程序在滚动展开列表视图时随机崩溃

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