Question

在我将Sdk版本更新为27之前，一切都很好。这里说在创建时不得附加ViewHolder视图。但是我的LayoutInflater中的attachToRoot参数已经设置为＆＃39; true＆＃39;。请解释一下可能导致这个问题的原因？的 logcat的：

06-02 11:40:15.669 22801-22801/com.bestworldgames.bestwordgame E/AndroidRuntime: FATAL EXCEPTION: main
Process: com.bestworldgames.bestwordgame, PID: 22801
java.lang.IllegalStateException: ViewHolder views must not be attached when created. Ensure that you are not passing 'true' to the attachToRoot parameter of LayoutInflater.inflate(..., boolean attachToRoot)
at android.support.v7.widget.RecyclerView$Adapter.createViewHolder(RecyclerView.java:6687)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5869)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5752)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5748)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2232)
at android.support.v7.widget.GridLayoutManager.layoutChunk(GridLayoutManager.java:556)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1519)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:614)
at android.support.v7.widget.GridLayoutManager.onLayoutChildren(GridLayoutManager.java:170)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3812)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:3225)
at android.view.View.measure(View.java:18788)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18788)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:141)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1465)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:748)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:630)
at android.view.View.measure(View.java:18788)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:5951)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:194)
at com.android.internal.policy.PhoneWindow$DecorView.onMeasure(PhoneWindow.java:2643)
at android.view.View.measure(View.java:18788)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2100)
at android.view.ViewRootImpl.measureHierarchy(ViewRootImpl.java:1216)
at android.view.ViewRootImpl.performTraversals(ViewRootImpl.java:1452)
at android.view.ViewRootImpl.doTraversal(ViewRootImpl.java:1107)
at android.view.ViewRootImpl$TraversalRunnable.run(ViewRootImpl.java:6013)
at android.view.Choreographer$CallbackRecord.run(Choreographer.java:858)
at android.view.Choreographer.doCallbacks(Choreographer.java:670)
at android.view.Choreographer.doFrame(Choreographer.java:606)

这是我的 RecyclerView适配器：

public class GameTableAdapter extends RecyclerView.Adapter<GameTableAdapter.ViewHolder> {


private ArrayList<Litera> literas;
private LayoutInflater mInflater;
private Map<Integer, Integer> hashMap;
private Context context;
private ArrayList<Button> adapterItems;
private View mainView;
private int itemSize;

public GameTableAdapter(Context context, ArrayList<Litera> literas, Map<Integer, Integer> hashMap, int itemSize) {
    this.mInflater = LayoutInflater.from(context);
    this.literas = literas;
    this.hashMap = hashMap;
    this.context = context;
    this.adapterItems = new ArrayList<>();
    this.itemSize = itemSize;
}

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = mInflater.inflate(R.layout.but_item, parent, false);
    parent.removeView(view);
    parent.addView(view);
    mainView = parent;
    return new ViewHolder(view);
}

@Override
public void onBindViewHolder(ViewHolder holder, final int position) {
    char mChar = literas.get(position).getCharValue();
    holder.item.setText(String.valueOf(mChar));
    if (this.hashMap.containsKey(position) && (hashMap.get(position)!=null)) {
        setImg(hashMap.get(position), holder.item);
        holder.item.setTextColor(context.getResources().getColor(R.color.colorWhite));
    }
}

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

public class ViewHolder extends RecyclerView.ViewHolder {
    Button item;
    ViewHolder(View itemView) {
        super(itemView);
        item = (Button) itemView.findViewById(R.id.item);
        item.setLayoutParams(new RecyclerView.LayoutParams(itemSize, itemSize));
        item.setTextSize(TypedValue.COMPLEX_UNIT_PX,(float)itemSize/2);
        adapterItems.add(item);
    }

}

public Litera getItem(int id) {
    return literas.get(id);
}

public Button getButItem(int id) {
    return adapterItems.get(id);
}

public View getMainView() {
    return mainView;
}

public void animateItem(int id) {
    adapterItems.get(id).setVisibility(View.INVISIBLE);
    adapterItems.get(id).setVisibility(View.VISIBLE);
}

}

片段：

中的

    recyclerView = (TouchableRecyclerView) rootView.findViewById(R.id.rv_chars);

...

public void setUpAdapter() {
        numberOfColumns = col;
        int itemSize = screenWidth / numberOfColumns;
        recyclerView.setLayoutManager(new GridLayoutManager(getActivity(), numberOfColumns));
        adapter = new GameTableAdapter(getActivity(), literas, hashMapAllColors, itemSize);
        recyclerView.setAdapter(adapter);
        recyclerView.setNestedScrollingEnabled(false);
        recyclerView.setOnTouchListener(this);
    }

TouchableRecyclerView.java

public class TouchableRecyclerView extends RecyclerView {
    public TouchableRecyclerView(Context context) {
        super(context);
    }

    public TouchableRecyclerView(Context context, @Nullable AttributeSet attrs) {
        super(context, attrs);
    }

    public TouchableRecyclerView(Context context, @Nullable AttributeSet attrs, int defStyle) {
        super(context, attrs, defStyle);
    }

    public boolean performClick() {
        return super.performClick();
    }

}

xml 中的

：

<com.bestworldgames.bestwordgame.widgets.TouchableRecyclerView android:id="@+id/rv_chars" android:layout_below="@+id/tapped_word" android:paddingLeft="5dp" android:layout_centerHorizontal="true" android:layout_width="wrap_content" android:layout_height="wrap_content" android:overScrollMode="never" android:clickable="true" android:focusable="true" android:longClickable = "false"> </com.bestworldgames.bestwordgame.widgets.TouchableRecyclerView>

but_item.xml

<?xml version="1.0" encoding="utf-8"?> <Button xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/item" android:paddingRight="6dp" android:paddingBottom="8dp" android:animateLayoutChanges="true" android:layout_width="50dp" android:layout_height="50dp" android:background="@drawable/button_color_1" android:longClickable="false" android:clickable="false" android:focusable="false"> </Button>

工作构造函数后发生此错误 public ViewHolder(View itemView)之前和方法之前 onBindViewHolder(ViewHolder holder, final int position)。这就是我现在所能说的全部。

Answer 1

试试这个：这里使用的parent.addView（）方法将视图附加到父级，因此问题不在于onCreateItemViewHolder自定义实现。

将onCreateMyViewHolder方法重写为自定义适配器，就像其他人一样

 public class MyViewHolder extends RecyclerView.ViewHolder {
    public  Button item;

    public MyViewHolder(View view) {
        super(view);
        item = (Button) itemView.findViewById(R.id.item);
    item.setLayoutParams(new RecyclerView.LayoutParams(itemSize, itemSize));
    item.setTextSize(TypedValue.COMPLEX_UNIT_PX,(float)itemSize/2);
    adapterItems.add(item);
    }
}

覆盖onCreate viewHolder，如下所示：

@Override
public MyViewHolder onCreateMyViewHolder (ViewGroup parent) {

LayoutInflater inflater = LayoutInflater.from(parent.getContext());
View mView= inflater.inflate(R.layout.but_item, parent, false);


return new MyViewHolder (mView);
}

Answer 2

感谢Jarvis_J帮助我solve我的问题！解决方案是通过引用类来设置覆盖方法的返回类型。

而不是：

@Override
public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    View view = mInflater.inflate(R.layout.but_item, parent, false);
    parent.removeView(view);
    parent.addView(view);
    mainView = parent;
    return new ViewHolder(view);
}

我必须这样做：

@Override
public GameTableAdapter.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
    LayoutInflater inflater = LayoutInflater.from(parent.getContext());
    View view = inflater.inflate(R.layout.but_item, parent, false);
    mainView = parent;
    return new GameTableAdapter.ViewHolder(view);
}

并且确实没有必要parent.removeView(view) parent.addView(view)。

我希望它会帮助别人！

更新到API 27后，RecyclerView适配器出现问题

2 个答案: