Android:RecyclerView不在片段中显示列表项
有人能帮我让我的回收视图出现吗。如果我不在片段中实现它，它就会出现。然而，当我尝试将其实现为一个片段时，我的另一个XML代码（CarFront）显示在RecyclerView之外 我的日志中出现以下错误： “E/RecyclerView:未连接适配器；跳过布局” 下面是我的代码，如果您需要任何其他信息或代码的其他部分，请随时在下面发表评论。多谢各位 适配器：Android:RecyclerView不在片段中显示列表项,android,android-recyclerview,fragment,Android,Android Recyclerview,Fragment,有人能帮我让我的回收视图出现吗。如果我不在片段中实现它，它就会出现。然而，当我尝试将其实现为一个片段时，我的另一个XML代码（CarFront）显示在RecyclerView之外 我的日志中出现以下错误： “E/RecyclerView:未连接适配器；跳过布局” 下面是我的代码，如果您需要任何其他信息或代码的其他部分，请随时在下面发表评论。多谢各位 适配器： （我不擅长格式化和解释我的问题。但是，基本上我的RecyclerView没有显示在我的fragement中。它是用来显示Cardview/
（我不擅长格式化和解释我的问题。但是，基本上我的RecyclerView没有显示在我的fragement中。它是用来显示Cardview/s的）好的，首先，你的片段的结构应该如下所示。在
onCreateViewonViewCreatednewInstanceandroid.support.v4.app.FragmentFragmentpublic class CarFrontFragment extends Fragment {
public ImageView bumper; // Do not use static views.
public ImageView hood;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_car_front, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// Bind your views.
RecyclerView list = (RecyclerView) view.findViewById(R.id.front_recyclerview);
bumper = (ImageView) view.findViewById(R.id.fbumperselected);
hood = (ImageView) view.findViewById(R.id.hoodselected);
// Create your layout manager.
LinearLayoutManager layout = new LinearLayoutManager(getContext());
list.setLayoutManager(layout);
// Fetch your items.
List<ItemObject> rowListItem = getAllItemList();
// Set your adapter
RecyclerViewAdapter adapter = new RecyclerViewAdapter(getContext(), rowListItem);
list.setAdapter(adapter);
}
// Creating a new Fragment through newInstance.
public static CarFrontFragment newInstance() {
return new CarFrontFragment();
}
// Fetching items, passing in the View they will control.
private List<ItemObject> getAllItemList(){
List<ItemObject> allItems = new ArrayList<ItemObject>();
allItems.add(new ItemObject("", R.drawable.hood_selected), hood);
allItems.add(new ItemObject("", R.drawable.bumped_selected), bumper);
return allItems;
}
}
视图
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolders> {
private List<ItemObject> itemList;
private Context context;
public RecyclerViewAdapter(Context context, List<ItemObject> itemList) {
this.itemList = itemList;
this.context = context;
}
@Override
public RecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) {
View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_list, null);
RecyclerViewHolders rcv = new RecyclerViewHolders(layoutView);
return rcv;
}
@Override
public void onBindViewHolder(RecyclerViewHolders holder, int position) {
holder.photo.setImageResource(itemList.get(position).getPhoto());
// Telling the holder about the View.
holder.view = itemList.get(position).getView();
}
@Override
public int getItemCount() {
return itemList.size();
}
}
您的CarFront
类不是在扩展片段，而是在扩展appcompatiacvity
。您在哪里创建片段？我在你的代码里找不到。Welcome
是欢迎浏览教程的一种方式吗？好的，让我尝试帮助您修复设置中的一些项目。给我一点时间。没关系，我只是想试着重写一些东西，然后我们会看看这是否有助于让你走上正确的轨道。好的，我发布了一个关于如何构造你的片段
和查看页面
，尝试检查一下。再次感谢你（这些评论真的很有帮助）。这看起来真的很吓人。我担心我现在可能无法像以前那样与单个卡片交互。我是否可以发布我的RecycleServiceWholder，以便您可以快速查看我是否仍然能够像以前一样进行交互。这还不错，它只是片段和ViewPager的基本结构。您希望如何像以前一样与卡片交互？很难准确地说出你在用每张卡做什么。RecycleServiceWholder
不在你发布的代码中。好吧，你只需要触摸一下，就能隐藏或显示汽车的保险杠？您可以在片段中轻松处理该问题。您不需要对它进行静态引用。我已经更新了答案，片段现在实现了View.OnTouchListener
，您可以显示/隐藏保险杠。通过这种方式，你对片段有了更多的控制，你的Welcome
类不需要知道这些交互，片段可以处理它们。是的，只要把它们放到片段中，你就可以为片段做任何你需要做的事。
public class CarFront extends AppCompatActivity {
private LinearLayoutManager lLayout;
public static ImageView fbumper;
public static ImageView hood;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
//remove title/fullscreen
//requestWindowFeature(Window.FEATURE_NO_TITLE);
//getWindow().setFlags(WindowManager.LayoutParams.FLAG_FULLSCREEN,
//WindowManager.LayoutParams.FLAG_FULLSCREEN);
setContentView(R.layout.activity_car_front);
setTitle(null);
List<ItemObject> rowListItem = getAllItemList();
lLayout = new LinearLayoutManager(CarFront.this);
RecyclerView rView = (RecyclerView)findViewById(R.id.front_recyclerview);
rView.setLayoutManager(lLayout);
RecyclerViewAdapter rcAdapter = new RecyclerViewAdapter(CarFront.this, rowListItem);
rView.setAdapter(rcAdapter);
//Selected Images
fbumper = (ImageView)findViewById(R.id.fbumperselected);
hood = (ImageView)findViewById(R.id.hoodselected);
}
private List<ItemObject> getAllItemList(){
List<ItemObject> allItems = new ArrayList<ItemObject>();
allItems.add(new ItemObject("", R.drawable.hood_selected));
//allItems.add(new ItemObject("", R.drawable.hood_card));
return allItems;
}
public static class ViewHolder extends RecyclerView.ViewHolder
{
public ViewHolder(View itemView) {
super(itemView);
}
}
}
<?xml version="1.0" encoding="utf-8" ?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:app="http://schemas.android.com/apk/res-auto"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="vertical"
android:background="@color/background">
<android.support.v7.widget.Toolbar
android:layout_width="fill_parent"
android:layout_height="45dp"
android:background="@drawable/top_logo">
</android.support.v7.widget.Toolbar>
<android.support.constraint.ConstraintLayout
android:layout_width="match_parent"
android:layout_height="200dp">
<ImageView
android:id="@+id/carfront"
android:layout_width="368dp"
android:layout_height="200dp"
android:scaleType="fitStart"
app:srcCompat="@drawable/carfront"
tools:layout_editor_absoluteY="50dp"
tools:layout_editor_absoluteX="8dp" />
<ImageView
android:id="@+id/hoodselected"
android:layout_width="368dp"
android:layout_height="200dp"
android:scaleType="fitStart"
app:srcCompat="@drawable/hood_selected"
tools:layout_editor_absoluteY="50dp"
tools:layout_editor_absoluteX="8dp"
android:visibility="invisible"/>
<ImageView
android:id="@+id/fbumperselected"
android:layout_width="368dp"
android:layout_height="200dp"
android:scaleType="fitStart"
app:srcCompat="@drawable/fbumper_selected"
tools:layout_editor_absoluteY="0dp"
tools:layout_editor_absoluteX="8dp"
android:visibility="invisible"/>
</android.support.constraint.ConstraintLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/front_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:scrollbars="none" />
</LinearLayout>
public class RecyclerViewHolders extends RecyclerView.ViewHolder implements View.OnTouchListener{
//public TextView countryName;
public ImageView photo;
public ImageView fbumper;
public RecyclerViewHolders(View itemView) {
super(itemView);
itemView.setOnTouchListener(this);
photo = (ImageView)itemView.findViewById(R.id.cardview);
}
@Override
//make a gesture detector
//make a nice clean graphic after they tap on repair, telling the user how it works
//pointer = multitouch
public boolean onTouch(View view, MotionEvent event)
{
switch (event.getAction() & MotionEvent.ACTION_MASK)
{
case MotionEvent.ACTION_DOWN:
actionDown();
break;
case MotionEvent.ACTION_POINTER_UP:
actionUp();
break;
}
return true;
}
// Method for Down Press
public void actionDown()
{
switch (getAdapterPosition())
{
case 0:
CarFront.fbumper.setVisibility(View.VISIBLE);
break;
case 1:
}
}
//Method for Up Press
public void actionUp()
{
switch (getAdapterPosition())
{
case 0:
CarFront.fbumper.setVisibility(View.INVISIBLE);
//break;
case 1:
}
}
}
public class CarFrontFragment extends Fragment {
public ImageView bumper; // Do not use static views.
public ImageView hood;
@Nullable
@Override
public View onCreateView(LayoutInflater inflater, @Nullable ViewGroup container, @Nullable Bundle savedInstanceState) {
return inflater.inflate(R.layout.fragment_car_front, container, false);
}
@Override
public void onViewCreated(View view, @Nullable Bundle savedInstanceState) {
super.onViewCreated(view, savedInstanceState);
// Bind your views.
RecyclerView list = (RecyclerView) view.findViewById(R.id.front_recyclerview);
bumper = (ImageView) view.findViewById(R.id.fbumperselected);
hood = (ImageView) view.findViewById(R.id.hoodselected);
// Create your layout manager.
LinearLayoutManager layout = new LinearLayoutManager(getContext());
list.setLayoutManager(layout);
// Fetch your items.
List<ItemObject> rowListItem = getAllItemList();
// Set your adapter
RecyclerViewAdapter adapter = new RecyclerViewAdapter(getContext(), rowListItem);
list.setAdapter(adapter);
}
// Creating a new Fragment through newInstance.
public static CarFrontFragment newInstance() {
return new CarFrontFragment();
}
// Fetching items, passing in the View they will control.
private List<ItemObject> getAllItemList(){
List<ItemObject> allItems = new ArrayList<ItemObject>();
allItems.add(new ItemObject("", R.drawable.hood_selected), hood);
allItems.add(new ItemObject("", R.drawable.bumped_selected), bumper);
return allItems;
}
}
public class PagerAdapter extends FragmentStatePagerAdapter {
public static final int NUM_OF_PAGES = 2;
private static final int PAGE_WELCOME = 0;
private static final int PAGE_CAR_FRONT = 1;
public PagerAdapter(FragmentManager fm) {
super(fm);
}
@Override
public Fragment getItem(int position) {
switch (position) {
case PAGE_WELCOME:
// Return a new instance of your Fragment.
case PAGE_CAR_FRONT:
return CarFrontFragment.newInstance();
}
return null;
}
@Override
public int getCount() {
return NUM_OF_PAGES;
}
}
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerViewHolders> {
private List<ItemObject> itemList;
private Context context;
public RecyclerViewAdapter(Context context, List<ItemObject> itemList) {
this.itemList = itemList;
this.context = context;
}
@Override
public RecyclerViewHolders onCreateViewHolder(ViewGroup parent, int viewType) {
View layoutView = LayoutInflater.from(parent.getContext()).inflate(R.layout.card_view_list, null);
RecyclerViewHolders rcv = new RecyclerViewHolders(layoutView);
return rcv;
}
@Override
public void onBindViewHolder(RecyclerViewHolders holder, int position) {
holder.photo.setImageResource(itemList.get(position).getPhoto());
// Telling the holder about the View.
holder.view = itemList.get(position).getView();
}
@Override
public int getItemCount() {
return itemList.size();
}
}
public class RecyclerViewHolders extends RecyclerView.ViewHolder implements View.OnTouchListener {
ImageView photo;
public View view;
public RecyclerViewHolders(View itemView) {
super(itemView);
itemView.setOnTouchListener(this);
photo = (ImageView) itemView.findViewById(R.id.cardview);
}
@Override
public boolean onTouch(View view, MotionEvent event) {
switch (event.getAction() & MotionEvent.ACTION_MASK) {
case MotionEvent.ACTION_DOWN:
this.view.setVisibility(View.VISIBLE);
break;
case MotionEvent.ACTION_POINTER_UP:
this.view.setVisibility(View.GONE);
break;
}
return true;
}
}