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/* | |
* Copyright (C) 2014 sebnapi | |
* | |
* Licensed under the Apache License, Version 2.0 (the "License"); | |
* you may not use this file except in compliance with the License. | |
* You may obtain a copy of the License at | |
* | |
* http://www.apache.org/licenses/LICENSE-2.0 | |
* | |
* Unless required by applicable law or agreed to in writing, software | |
* distributed under the License is distributed on an "AS IS" BASIS, | |
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
* See the License for the specific language governing permissions and | |
* limitations under the License. | |
*/ | |
import android.support.v7.widget.RecyclerView; | |
import android.view.ViewGroup; | |
/** | |
* Created by sebnapi on 08.11.14. | |
* <p/> | |
* If you extend this Adapter you are able to add a Header, a Footer or both | |
* by a similar ViewHolder pattern as in RecyclerView. | |
* <p/> | |
* If you want to omit changes to your class hierarchy you can try the Plug-and-Play | |
* approach HeaderRecyclerViewAdapterV1. | |
* <p/> | |
* Don't override (Be careful while overriding) | |
* - onCreateViewHolder | |
* - onBindViewHolder | |
* - getItemCount | |
* - getItemViewType | |
* <p/> | |
* You need to override the abstract methods introduced by this class. This class | |
* is not using generics as RecyclerView.Adapter make yourself sure to cast right. | |
* <p/> | |
* TOTALLY UNTESTED - USE WITH CARE - HAVE FUN :) | |
*/ | |
public abstract class HeaderRecyclerViewAdapterV2 extends RecyclerView.Adapter { | |
private static final int TYPE_HEADER = Integer.MIN_VALUE; | |
private static final int TYPE_FOOTER = Integer.MIN_VALUE + 1; | |
private static final int TYPE_ADAPTEE_OFFSET = 2; | |
@Override | |
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { | |
if (viewType == TYPE_HEADER) { | |
return onCreateHeaderViewHolder(parent, viewType); | |
} else if (viewType == TYPE_FOOTER) { | |
return onCreateFooterViewHolder(parent, viewType); | |
} | |
return onCreateBasicItemViewHolder(parent, viewType - TYPE_ADAPTEE_OFFSET); | |
} | |
@Override | |
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) { | |
if (position == 0 && holder.getItemViewType() == TYPE_HEADER) { | |
onBindHeaderView(holder, position); | |
} else if (position == getBasicItemCount() && holder.getItemViewType() == TYPE_FOOTER) { | |
onBindFooterView(holder, position); | |
} else { | |
onBindBasicItemView(holder, position - (useHeader() ? 1 : 0)); | |
} | |
} | |
@Override | |
public int getItemCount() { | |
int itemCount = getBasicItemCount(); | |
if (useHeader()) { | |
itemCount += 1; | |
} | |
if (useFooter()) { | |
itemCount += 1; | |
} | |
return itemCount; | |
} | |
@Override | |
public int getItemViewType(int position) { | |
if (position == 0 && useHeader()) { | |
return TYPE_HEADER; | |
} | |
if (position == getBasicItemCount() && useFooter()) { | |
return TYPE_FOOTER; | |
} | |
if (getBasicItemType(position) >= Integer.MAX_VALUE - TYPE_ADAPTEE_OFFSET) { | |
new IllegalStateException("HeaderRecyclerViewAdapter offsets your BasicItemType by " + TYPE_ADAPTEE_OFFSET + "."); | |
} | |
return getBasicItemType(position) + TYPE_ADAPTEE_OFFSET; | |
} | |
public abstract boolean useHeader(); | |
public abstract RecyclerView.ViewHolder onCreateHeaderViewHolder(ViewGroup parent, int viewType); | |
public abstract void onBindHeaderView(RecyclerView.ViewHolder holder, int position); | |
public abstract boolean useFooter(); | |
public abstract RecyclerView.ViewHolder onCreateFooterViewHolder(ViewGroup parent, int viewType); | |
public abstract void onBindFooterView(RecyclerView.ViewHolder holder, int position); | |
public abstract RecyclerView.ViewHolder onCreateBasicItemViewHolder(ViewGroup parent, int viewType); | |
public abstract void onBindBasicItemView(RecyclerView.ViewHolder holder, int position); | |
public abstract int getBasicItemCount(); | |
/** | |
* make sure you don't use [Integer.MAX_VALUE-1, Integer.MAX_VALUE] as BasicItemViewType | |
* | |
* @param position | |
* @return | |
*/ | |
public abstract int getBasicItemType(int position); | |
} |
getItemViewType is broken you can modify it to :-
@Override
public int getItemViewType(int position) {
if (position == 0 && useHeader()) {
return TYPE_HEADER;
}
if (position == getBasicItemCount() && useFooter()) {
return TYPE_FOOTER;
}
int basicItemType = getBasicItemType(position - (useHeader() ? 1 : 0));
if (basicItemType >= Integer.MAX_VALUE - TYPE_ADAPTEE_OFFSET) {
new IllegalStateException(
"HeaderRecyclerViewAdapter offsets your BasicItemType by " + TYPE_ADAPTEE_OFFSET + ".");
}
return basicItemType + TYPE_ADAPTEE_OFFSET;
}
@marutib 👍 Thanks
if (position >= getBasicItemCount() && useFooter()) { return TYPE_FOOTER; }
This should be change in the last comment! otherwise we may run in out of bound exception
It has been working perfectly until I tried to use both footer and header.
When I used both of them, the last item of basic items was processed as a footer, which caused crashes when I scrolled down to the last item...
I modified following two methods to fix this. Hope this is a right way to do it... :)
public int getItemViewType(int position) {
if (position == 0 && useHeader()) {
return TYPE_HEADER;
}
if (useHeader() && position > getBasicItemCount() && useFooter())
return TYPE_FOOTER;
else if (!useHeader() && position > getBasicItemCount() && useFooter())
return TYPE_FOOTER;
int basicItemType = getBasicItemType(position - (useHeader() ? 1 : 0));
if (basicItemType >= Integer.MAX_VALUE - TYPE_ADAPTEE_OFFSET) {
new IllegalStateException(
"HeaderRecyclerViewAdapter offsets your BasicItemType by " + TYPE_ADAPTEE_OFFSET + ".");
}
return basicItemType + TYPE_ADAPTEE_OFFSET;
}
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (position == 0 && holder.getItemViewType() == TYPE_HEADER) {
onBindHeaderView(holder, position);
} else if (useHeader() && position > getBasicItemCount() && holder.getItemViewType() == TYPE_FOOTER) {
onBindFooterView(holder, position);
} else if (!useHeader() && position >= getBasicItemCount() && holder.getItemViewType() == TYPE_FOOTER) {
onBindFooterView(holder, position);
}
else {
onBindBasicItemView(holder, position - (useHeader() ? 1 : 0));
}
}
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works fine for me.Thanks!