基于我实现的相同示例，我创建了一个我的RecyclerView的自定义适配器。代码是这样的：
public class AirportsAdapter extends RealmRecyclerViewAdapter<Airport,RecyclerView.ViewHolder> implements Filterable
{
Context context;
public static final int FILTER_MODE_A = 0;
public static final int FILTER_MODE_B = 1;
OrderedRealmCollection<Airport> listAirports;
RealmResults<Airport> nearby;
Realm realm;
int NEARBY = 0;
int nearbySize;
boolean COUNTRY = false;
int ALL = 0;
public AirportsAdapter(Context context, OrderedRealmCollection<Airport>airports, RealmResults<Airport> nearby, Realm realm)
{
super(context,airports, true);
this.context = context;
this.listAirports = airports;
this.realm = realm;
this.nearby = nearby;
nearbySize = nearby.size();
ALL = ALL + nearbySize;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
//sono tutti uguali no?
//sisi l'avevo messo così solo per non fare un mega or
if(viewType == 0 || viewType== ALL || (viewType == 0 && (COUNTRY)))
{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.input_custom_item, parent, false);
MenuHolder menuHolder = new MenuHolder(view);
return menuHolder;
}
else
{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.airport_show, parent, false);
AirportClass holder = new AirportClass(view);
return holder;
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
if(position==0)
{
MenuHolder mHolder = (MenuHolder)holder;
mHolder.type.setText("Nearby");
mHolder.type.setTypeface(Typeface.createFromAsset(context.getAssets(),"fonts/Avenir-Medium.ttf"),Typeface.BOLD);
}
else if(position == ALL)
{
MenuHolder mHolder = (MenuHolder)holder;
mHolder.type.setText("All");
mHolder.type.setTypeface(Typeface.createFromAsset(context.getAssets(),"fonts/Avenir-Medium.ttf"),Typeface.BOLD);
}
else if(position == 0 && (COUNTRY))
{
MenuHolder mHolder = (MenuHolder)holder;
mHolder.type.setText("Country");
mHolder.type.setTypeface(Typeface.createFromAsset(context.getAssets(),"fonts/Avenir-Medium.ttf"),Typeface.BOLD);
}
else
{
AirportClass mHolder = (AirportClass) holder;
Airport airport = listAirports.get(position);
String country = airport.getIsoCountry().toLowerCase();
if (country.equals("do"))
country = "dom";
int imgID = context.getResources().getIdentifier(country, "drawable", context.getPackageName());
Glide.with(context).load(imgID).into(mHolder.image);
mHolder.des.setText(airport.getIdent());
mHolder.name.setText(airport.getName());
mHolder.des.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/Avenir-Book.ttf"), Typeface.BOLD);
mHolder.name.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/Avenir-Book.ttf"));
}
}
public void filterResults(String text, int filterMode)
{
String txt = text;
text = text == null ? null : text.toLowerCase().trim();
if(text == null || "".equals(text))
{
listAirports = realm.where(Airport.class).findAll();
}
else
{
if(filterMode == FILTER_MODE_A)
{
listAirports = realm.where(Airport.class).contains("name", text, Case.INSENSITIVE).findAll();
COUNTRY = false;
}
if(filterMode == FILTER_MODE_B)
{
System.out.print(text);
COUNTRY = true;
Countries country = realm.where(Countries.class).equalTo("name",txt).findFirst();
listAirports = realm.where(Airport.class).equalTo("isoCountry", country.getCode(), Case.INSENSITIVE).findAll();
}
}
updateData(listAirports);
}
public Filter getFilter(int filterMode)
{
AirportFilter filter = new AirportFilter(this, filterMode);
return filter;
}
@Override
public Filter getFilter() {
return null;
}
private class AirportFilter extends Filter
{
private final AirportsAdapter adapter;
private int filterMode;
private AirportFilter(AirportsAdapter adapter, int filterMode)
{
super();
this.adapter = adapter;
this.filterMode = filterMode;
}
@Override
protected FilterResults performFiltering(CharSequence constraint)
{
if (filterMode == FILTER_MODE_A)
return new Filter.FilterResults();
if (filterMode == FILTER_MODE_B)
return new Filter.FilterResults();
return new Filter.FilterResults();
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results)
{
adapter.filterResults(constraint.toString(),filterMode);
}
}
private class AirportClass extends RecyclerView.ViewHolder
{
TextView name, des;
ImageView image;
public AirportClass(View itemView)
{
super(itemView);
name = (TextView)itemView.findViewById(R.id.name);
des = (TextView)itemView.findViewById(R.id.item);
image = (ImageView)itemView.findViewById(R.id.color);
}
}
private class MenuHolder extends RecyclerView.ViewHolder
{
TextView type;
public MenuHolder(View itemView)
{
super(itemView);
type = (TextView)itemView.findViewById(R.id.init);
}
}
}
它类似于其他适配器，但是当我调试它时，我有这个错误：
Process: com.example, PID: 1663
java.lang.ClassCastException: com.example.Airports.AirportsAdapter$MenuHolder cannot be cast to com.example.Airports.AirportsAdapter$AirportClass
at com.example.Airports.AirportsAdapter.onBindViewHolder(AirportsAdapter.java:118)
at android.support.v7.widget.RecyclerView$Adapter.onBindViewHolder(RecyclerView.java:6279)
at android.support.v7.widget.RecyclerView$Adapter.bindViewHolder(RecyclerView.java:6312)
at android.support.v7.widget.RecyclerView$Recycler.tryBindViewHolderByDeadline(RecyclerView.java:5258)
at android.support.v7.widget.RecyclerView$Recycler.tryGetViewHolderForPositionByDeadline(RecyclerView.java:5521)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5363)
at android.support.v7.widget.RecyclerView$Recycler.getViewForPosition(RecyclerView.java:5359)
at android.support.v7.widget.LinearLayoutManager$LayoutState.next(LinearLayoutManager.java:2141)
at android.support.v7.widget.LinearLayoutManager.layoutChunk(LinearLayoutManager.java:1525)
at android.support.v7.widget.LinearLayoutManager.fill(LinearLayoutManager.java:1488)
at android.support.v7.widget.LinearLayoutManager.onLayoutChildren(LinearLayoutManager.java:585)
at android.support.v7.widget.RecyclerView.dispatchLayoutStep2(RecyclerView.java:3506)
at android.support.v7.widget.RecyclerView.onMeasure(RecyclerView.java:2969)
at android.view.View.measure(View.java:19730)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:19730)
at android.widget.RelativeLayout.measureChildHorizontal(RelativeLayout.java:715)
at android.widget.RelativeLayout.onMeasure(RelativeLayout.java:461)
at android.view.View.measure(View.java:19730)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.support.design.widget.CoordinatorLayout.onMeasureChild(CoordinatorLayout.java:714)
at android.support.design.widget.HeaderScrollingViewBehavior.onMeasureChild(HeaderScrollingViewBehavior.java:90)
at android.support.design.widget.AppBarLayout$ScrollingViewBehavior.onMeasureChild(AppBarLayout.java:1375)
at android.support.design.widget.CoordinatorLayout.onMeasure(CoordinatorLayout.java:784)
at android.view.View.measure(View.java:19730)
at android.support.v4.widget.DrawerLayout.onMeasure(DrawerLayout.java:1081)
at android.view.View.measure(View.java:19730)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.support.v7.widget.ContentFrameLayout.onMeasure(ContentFrameLayout.java:139)
at android.view.View.measure(View.java:19730)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19730)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at android.view.View.measure(View.java:19730)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.LinearLayout.measureChildBeforeLayout(LinearLayout.java:1464)
at android.widget.LinearLayout.measureVertical(LinearLayout.java:758)
at android.widget.LinearLayout.onMeasure(LinearLayout.java:640)
at android.view.View.measure(View.java:19730)
at android.view.ViewGroup.measureChildWithMargins(ViewGroup.java:6120)
at android.widget.FrameLayout.onMeasure(FrameLayout.java:185)
at com.android.internal.policy.DecorView.onMeasure(DecorView.java:687)
at android.view.View.measure(View.java:19730)
at android.view.ViewRootImpl.performMeasure(ViewRootImpl.java:2271)
这是我第一次遇到这个错误，我尝试解决它，但我只能通过以下方式解决它：
有没有办法解决这个错误？
编辑：这是新代码，它不会给出以前的错误，但会保持位置状态==0ç
public class AirportsAdapter extends RealmRecyclerViewAdapter<Airport,RecyclerView.ViewHolder> implements Filterable
{
Context context;
public static final int FILTER_MODE_A = 0;
public static final int FILTER_MODE_B = 1;
OrderedRealmCollection<Airport> listAirports;
RealmResults<Airport> nearby;
Realm realm;
int NEARBY = 0;
int nearbySize;
boolean COUNTRY = false;
int ALL = 0;
public AirportsAdapter(Context context, OrderedRealmCollection<Airport>airports, RealmResults<Airport> nearby, Realm realm)
{
super(context,airports, true);
this.context = context;
this.listAirports = airports;
this.realm = realm;
this.nearby = nearby;
nearbySize = nearby.size();
ALL = ALL + nearbySize;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType)
{
//sono tutti uguali no?
//sisi l'avevo messo così solo per non fare un mega or
if(viewType == NEARBY )
{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.input_custom_item, parent, false);
MenuHolder menuHolder = new MenuHolder(view);
return menuHolder;
}
else
{
View view = LayoutInflater.from(parent.getContext()).inflate(R.layout.airport_show, parent, false);
AirportClass holder = new AirportClass(view);
return holder;
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position)
{
if(getItemViewType(position)==NEARBY)
{
Log.i("ivt",String.valueOf(position));
MenuHolder mHolder = (MenuHolder)holder;
mHolder.type.setText("Nearby");
mHolder.type.setTypeface(Typeface.createFromAsset(context.getAssets(),"fonts/Avenir-Medium.ttf"),Typeface.BOLD);
}
/* else if(getItemViewType(position) == ALL)
{
MenuHolder mHolder = (MenuHolder)holder;
mHolder.type.setText("All");
mHolder.type.setTypeface(Typeface.createFromAsset(context.getAssets(),"fonts/Avenir-Medium.ttf"),Typeface.BOLD);
}
else if(getItemViewType(position) == 0 && (COUNTRY))
{
MenuHolder mHolder = (MenuHolder)holder;
mHolder.type.setText("Country");
mHolder.type.setTypeface(Typeface.createFromAsset(context.getAssets(),"fonts/Avenir-Medium.ttf"),Typeface.BOLD);
}
*/
else
{
AirportClass mHolder = (AirportClass) holder;
Airport airport = listAirports.get(position);
String country = airport.getIsoCountry().toLowerCase();
if (country.equals("do"))
country = "dom";
int imgID = context.getResources().getIdentifier(country, "drawable", context.getPackageName());
Glide.with(context).load(imgID).into(mHolder.image);
mHolder.des.setText(airport.getIdent());
mHolder.name.setText(airport.getName());
mHolder.des.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/Avenir-Book.ttf"), Typeface.BOLD);
mHolder.name.setTypeface(Typeface.createFromAsset(context.getAssets(), "fonts/Avenir-Book.ttf"));
}
}
@Override
public int getItemViewType(int position)
{
return super.getItemViewType(position);
}
@Override
public int getItemCount()
{
if(nearbySize == 0)
{
return 1 + listAirports.size();
}
else
{
return 2 + nearbySize + listAirports.size();
}
}
public void filterResults(String text, int filterMode)
{
String txt = text;
text = text == null ? null : text.toLowerCase().trim();
if(text == null || "".equals(text))
{
listAirports = realm.where(Airport.class).findAll();
}
else
{
if(filterMode == FILTER_MODE_A)
{
listAirports = realm.where(Airport.class).contains("name", text, Case.INSENSITIVE).findAll();
COUNTRY = false;
}
if(filterMode == FILTER_MODE_B)
{
System.out.print(text);
COUNTRY = true;
Countries country = realm.where(Countries.class).equalTo("name",txt).findFirst();
listAirports = realm.where(Airport.class).equalTo("isoCountry", country.getCode(), Case.INSENSITIVE).findAll();
}
}
updateData(listAirports);
}
public Filter getFilter(int filterMode)
{
AirportFilter filter = new AirportFilter(this, filterMode);
return filter;
}
@Override
public Filter getFilter() {
return null;
}
private class AirportFilter extends Filter
{
private final AirportsAdapter adapter;
private int filterMode;
private AirportFilter(AirportsAdapter adapter, int filterMode)
{
super();
this.adapter = adapter;
this.filterMode = filterMode;
}
@Override
protected FilterResults performFiltering(CharSequence constraint)
{
if (filterMode == FILTER_MODE_A)
return new Filter.FilterResults();
if (filterMode == FILTER_MODE_B)
return new Filter.FilterResults();
return new Filter.FilterResults();
}
@Override
protected void publishResults(CharSequence constraint, FilterResults results)
{
adapter.filterResults(constraint.toString(),filterMode);
}
}
private class AirportClass extends RecyclerView.ViewHolder
{
TextView name, des;
ImageView image;
public AirportClass(View itemView)
{
super(itemView);
name = (TextView)itemView.findViewById(R.id.name);
des = (TextView)itemView.findViewById(R.id.item);
image = (ImageView)itemView.findViewById(R.id.color);
}
}
private class MenuHolder extends RecyclerView.ViewHolder
{
TextView type;
public MenuHolder(View itemView)
{
super(itemView);
type = (TextView)itemView.findViewById(R.id.init);
}
}
}
由于