android – FirebaseRecyclerAdapter：将Activity Context传递给ViewHolder

概述列表项中的每个 *** 作都是从RecyclerView.ViewHolder处理的.实际上,我想将Activity上下文传递给FirebaseRecyclerAdapter中的ViewHolder,所以我尝试将Constructor添加到此ViewHolder,如下所示： public class TodoViewHolder extends RecyclerView.ViewHolder { 列表项中的每个 *** 作都是从RecyclerVIEw.VIEwHolder处理的.实际上,我想将Activity上下文传递给FirebaseRecyclerAdapter中的VIEwHolder,所以我尝试将Constructor添加到此VIEwHolder,如下所示：

public class TodoVIEwHolder extends RecyclerVIEw.VIEwHolder {    @BindVIEw(R.ID.accbListItemHome)    AppCompatCheckBox mAppCompatCheckBox;    @BindVIEw(R.ID.actvListItemHome)    AppCompatTextVIEw mAppCompatTextVIEw;    @BindVIEw(R.ID.acibListItemHome)    AppCompatimagebutton mAppCompatimagebutton;    private Context mContext;    public TodoVIEwHolder(Context context,VIEw itemVIEw) {        super(itemVIEw);        mContext = context;        ButterKnife.bind(this,itemVIEw);    }    public AppCompatCheckBox getmAppCompatCheckBox() {        return mAppCompatCheckBox;    }    public AppCompatTextVIEw getmAppCompatTextVIEw() {        return mAppCompatTextVIEw;    }    public AppCompatimagebutton getmAppCompatimagebutton() {        return mAppCompatimagebutton;    }    @OnCheckedChanged(R.ID.accbListItemHome)    voID onCheckBoxChange(Compoundbutton compoundbutton,boolean checked) {        TodoMasterModel todoMasterModel = (TodoMasterModel) compoundbutton.getTag();        todoMasterModel.getmTodoModel().setmIsCompleted(checked);        ((HomeActivity) mContext).onDoneClick(todoMasterModel,AddEditDialogFragment.ACTION_Edit);        Log.i("CheckBox",todoMasterModel.toString());    }    @OnClick(R.ID.actvListItemHome)    voID onTextVIEwClick(VIEw vIEw) {        TodoMasterModel todoMasterModel = (TodoMasterModel) vIEw.getTag();        ((HomeActivity) mContext).showAddEditDialog(todoMasterModel,AddEditDialogFragment.ACTION_Edit);        Log.i("TextVIEw",todoMasterModel.toString());    }    @OnClick(R.ID.acibListItemHome)    voID onImagebuttonClick(VIEw vIEw) {        TodoMasterModel todoMasterModel = (TodoMasterModel) vIEw.getTag();        FirebaseDatabase.getInstance().getReference("todos").child(todoMasterModel.getmID()).setValue(todoMasterModel.getmTodoModel());        Log.i("Delete",todoMasterModel.toString());    }}

我为我的目的创建了我的类并修改了FirebaseRecyclerAdapter,如下所示：

public abstract class MyFirebaseAdapter<T,VH extends RecyclerVIEw.VIEwHolder> extends RecyclerVIEw.Adapter<VH> {    private Context mContext;    protected int mModelLayout;    Class<T> mModelClass;    Class<VH> mVIEwHolderClass;    FirebaseArray mSnapshots;    /**     * @param modelClass      Firebase will marshall the data at a location into an instance of a class that you provIDe     * @param modelLayout     This is the layout used to represent a single item in the List. You will be responsible for populating an     *                        instance of the corresponding vIEw with the data from an instance of modelClass.     * @param vIEwHolderClass The class that hold references to all sub-vIEws in an instance modelLayout.     * @param ref             The Firebase location to watch for data changes. Can also be a slice of a location,using some     *                        combination of <code>limit()</code>,<code>startAt()</code>,and <code>endAt()</code>     */    public MyFirebaseAdapter(Context context,Class<T> modelClass,int modelLayout,Class<VH> vIEwHolderClass,query ref) {        mContext = context;        mModelClass = modelClass;        mModelLayout = modelLayout;        mVIEwHolderClass = vIEwHolderClass;        mSnapshots = new FirebaseArray(ref);        mSnapshots.setonChangedListener(new FirebaseArray.OnChangedListener() {            @OverrIDe            public voID onChanged(EventType type,int index,int oldindex) {                switch (type) {                    case Added:                        notifyItemInserted(index);                        break;                    case Changed:                        notifyItemChanged(index);                        break;                    case Removed:                        notifyItemRemoved(index);                        break;                    case Moved:                        notifyItemmoved(oldindex,index);                        break;                    default:                        throw new IllegalStateException("Incomplete case statement");                }            }        });    }    /**     * @param modelClass      Firebase will marshall the data at a location into an instance of a class that you provIDe     * @param modelLayout     This is the layout used to represent a single item in the List. You will be responsible for populating an     *                        instance of the corresponding vIEw with the data from an instance of modelClass.     * @param vIEwHolderClass The class that hold references to all sub-vIEws in an instance modelLayout.     * @param ref             The Firebase location to watch for data changes. Can also be a slice of a location,DatabaseReference ref) {        this(context,modelClass,modelLayout,vIEwHolderClass,(query) ref);    }    public voID cleanup() {        mSnapshots.cleanup();    }    @OverrIDe    public int getItemCount() {        return mSnapshots.getCount();    }    public T getItem(int position) {        return parseSnapshot(mSnapshots.getItem(position));    }    /**     * This method parses the DataSnapshot into the requested type. You can overrIDe it in subclasses     * to do custom parsing.     *     * @param snapshot the DataSnapshot to extract the model from     * @return the model extracted from the DataSnapshot     */    protected T parseSnapshot(DataSnapshot snapshot) {        return snapshot.getValue(mModelClass);    }    public DatabaseReference getRef(int position) {        return mSnapshots.getItem(position).getRef();    }    @OverrIDe    public long getItemID(int position) {        // https://stackoverflow.com/questions/5100071/whats-the-purpose-of-item-IDs-in-androID-ListvIEw-adapter        return mSnapshots.getItem(position).getKey().hashCode();    }    @OverrIDe    public VH onCreateVIEwHolder(VIEwGroup parent,int vIEwType) {        VIEwGroup vIEw = (VIEwGroup) LayoutInflater.from(parent.getContext()).inflate(vIEwType,parent,false);        try {            Constructor<VH> constructor = mVIEwHolderClass.getConstructor(VIEw.class);            return constructor.newInstance(mContext,vIEw);        } catch (NoSuchMethodException e) {            throw new RuntimeException(e);        } catch (InvocationTargetException e) {            throw new RuntimeException(e);        } catch (InstantiationException e) {            throw new RuntimeException(e);        } catch (illegalaccessexception e) {            throw new RuntimeException(e);        }    }    @OverrIDe    public voID onBindVIEwHolder(VH vIEwHolder,int position) {        T model = getItem(position);        populateVIEwHolder(vIEwHolder,model,position);    }    @OverrIDe    public int getItemVIEwType(int position) {        return mModelLayout;    }    /**     * Each time the data at the given Firebase location changes,this method will be called for each item that needs     * to be displayed. The first two arguments correspond to the mLayout and mModelClass given to the constructor of     * this class. The third argument is the item's position in the List.     * <p>     * Your implementation should populate the vIEw using the data contained in the model.     *     * @param vIEwHolder The vIEw to populate     * @param model      The object containing the data used to populate the vIEw     * @param position   The position in the List of the vIEw being populated     */    abstract protected voID populateVIEwHolder(VH vIEwHolder,T model,int position);}

由于这一行错误即将到来：

return constructor.newInstance(mContext,vIEw);

但我得到NoSuchMethod异常.我知道我做错了.但我没有办法做到这一点.任何人都可以帮助我吗？

java.lang.RuntimeException: java.lang.NoSuchMethodException:
[class androID.vIEw.VIEw]
at
com.letsnurture.androID.firebasedatabasedemo.adapter.MyFirebaseAdapter.onCreateVIEwHolder(MyFirebaseAdapter.java:120)
at
androID.support.v7.Widget.RecyclerVIEw$Adapter.createVIEwHolder(RecyclerVIEw.java:5779)
at
androID.support.v7.Widget.RecyclerVIEw$Recycler.getVIEwForposition(RecyclerVIEw.java:5003)
at
androID.support.v7.Widget.RecyclerVIEw$Recycler.getVIEwForposition(RecyclerVIEw.java:4913)
at
androID.support.v7.Widget.linearlayoutmanager$LayoutState.next(linearlayoutmanager.java:2029)
at
androID.support.v7.Widget.linearlayoutmanager.layoutChunk(linearlayoutmanager.java:1414)
at
androID.support.v7.Widget.linearlayoutmanager.fill(linearlayoutmanager.java:1377)
at
androID.support.v7.Widget.linearlayoutmanager.onLayoutChildren(linearlayoutmanager.java:578)
at
androID.support.v7.Widget.RecyclerVIEw.dispatchLayoutStep2(RecyclerVIEw.java:3260)
at
androID.support.v7.Widget.RecyclerVIEw.dispatchLayout(RecyclerVIEw.java:3069)
at
androID.support.v7.Widget.RecyclerVIEw.onLayout(RecyclerVIEw.java:3518)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at androID.Widget.linearLayout.setChildFrame(linearLayout.java:1743)
at
androID.Widget.linearLayout.layoutHorizontal(linearLayout.java:1732)
at androID.Widget.linearLayout.onLayout(linearLayout.java:1497)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at
androID.support.design.Widget.headerScrollingVIEwBehavior.layoutChild(headerScrollingVIEwBehavior.java:120)
at
androID.support.design.Widget.VIEwOffsetBehavior.onLayoutChild(VIEwOffsetBehavior.java:42)
at
androID.support.design.Widget.AppbarLayout$ScrollingVIEwBehavior.onLayoutChild(AppbarLayout.java:1319)
at
androID.support.design.Widget.CoordinatorLayout.onLayout(CoordinatorLayout.java:815)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at
androID.support.v4.Widget.DrawerLayout.onLayout(DrawerLayout.java:1191)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at androID.Widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at androID.Widget.FrameLayout.onLayout(FrameLayout.java:273)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at androID.Widget.linearLayout.setChildFrame(linearLayout.java:1743)
at androID.Widget.linearLayout.layoutVertical(linearLayout.java:1586)
at androID.Widget.linearLayout.onLayout(linearLayout.java:1495)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at androID.Widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at androID.Widget.FrameLayout.onLayout(FrameLayout.java:273)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at androID.Widget.linearLayout.setChildFrame(linearLayout.java:1743)
at androID.Widget.linearLayout.layoutVertical(linearLayout.java:1586)
at androID.Widget.linearLayout.onLayout(linearLayout.java:1495)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at androID.Widget.FrameLayout.layoutChildren(FrameLayout.java:336)
at androID.Widget.FrameLayout.onLayout(FrameLayout.java:273)
at
com.androID.internal.policy.PhoneWindow$DecorVIEw.onLayout(PhoneWindow.java:2678)
at androID.vIEw.VIEw.layout(VIEw.java:16651)
at androID.vIEw.VIEwGroup.layout(VIEwGroup.java:5440)
at androID.vIEw.VIEwRootImpl.performlayout(VIEwRootImpl.java:2183)
at androID.vIEw.VIEwRootImpl.performTraversals(VIEwRootImpl.java:1943)
at androID.vIEw.VIEwRootImpl.doTraversal(VIEwRootImpl.java:1119)
at
androID.vIEw.VIEwRootImpl$TraversalRunnable.run(VIEwRootImpl.java:6060)
at
androID.vIEw.Choreographer$CallbackRecord.run(Choreographer.java:858)
at androID.vi

解决方法 您的VIEwHolder子类需要一个只有VIEw参数的构造函数.从 FirebaseUI documentation：

public static class ChatHolder extends RecyclerVIEw.VIEwHolder {    VIEw mVIEw;    public ChatHolder(VIEw itemVIEw) {        super(itemVIEw);        mVIEw = itemVIEw;    }

原因是在this code,它只搜索单个签名.添加代码以搜索VIEwHolder(Context,VIEw)构造函数可能是一个很好的补充.您可以为firebaseui github repo添加功能请求吗？

更新：feature request on Github为那些期待它的人. 总结

以上是内存溢出为你收集整理的android – FirebaseRecyclerAdapter：将Activity Context传递给ViewHolder全部内容，希望文章能够帮你解决android – FirebaseRecyclerAdapter：将Activity Context传递给ViewHolder所遇到的程序开发问题。

如果觉得内存溢出网站内容还不错，欢迎将内存溢出网站推荐给程序员好友。