Java 在不覆盖第一个元素的情况下设置RecyclerView标头
您好,我有一个recyclerView,它显示包含通过改造从mysql获取的数据的卡片。在我的适配器中,我能够将第一张卡设置为静态元素,这是用户的配置文件图片,正如接受的答案所建议的那样。但是,他们没有注意到该方法覆盖了位置0处的前第一个元素。第一个元素被静态视图替换,但我不希望这样。我想要Java 在不覆盖第一个元素的情况下设置RecyclerView标头,java,android,android-recyclerview,Java,Android,Android Recyclerview,您好,我有一个recyclerView,它显示包含通过改造从mysql获取的数据的卡片。在我的适配器中,我能够将第一张卡设置为静态元素,这是用户的配置文件图片,正如接受的答案所建议的那样。但是,他们没有注意到该方法覆盖了位置0处的前第一个元素。第一个元素被静态视图替换,但我不希望这样。我想要 static card, cardview 0, cardview 1, cardview 2, etc 有什么想法吗?谢谢在“RecyclerView.Adapter”中使用“viewType” Rec
static card,
cardview 0,
cardview 1,
cardview 2,
etc
有什么想法吗?谢谢在“RecyclerView.Adapter”中使用“viewType” RecyclerView中的onCreateViewHolder
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
int layout = -1;
switch (viewType) {
case RecyclerViewItem.USER_PROFILE:
layout = R.layout.driving_item;
break;
case RecyclerViewItem.OTHER_USER_PROFILE:
layout = R.layout.date_item;
break;
case RecyclerViewItem.DATE:
layout = R.layout.send_button_item;
break;
}
View v = LayoutInflater.from(context).inflate(layout, parent, false);
return new MyViewHolder(v);
}
@Override
public void onBindViewHolder(final MyViewHolder myViewHolder, final int position) {
final int pos = myViewHolder.getAdapterPosition();
if (pos == -1) {
return;
}
final RecyclerViewItem item = ArrayList.get(pos);
switch (item.getType()) {
case RecyclerViewItem.USER_PROFILE:
//By type you want to do differently.
break;
case RecyclerViewItem.OTHER_USER_PROFILE:
//By type you want to do differently.
break;
case RecyclerViewItem.DATE:
//By type you want to do differently.
break;
}
}
RecyclerView中的onBindViewHolder
@Override
public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
int layout = -1;
switch (viewType) {
case RecyclerViewItem.USER_PROFILE:
layout = R.layout.driving_item;
break;
case RecyclerViewItem.OTHER_USER_PROFILE:
layout = R.layout.date_item;
break;
case RecyclerViewItem.DATE:
layout = R.layout.send_button_item;
break;
}
View v = LayoutInflater.from(context).inflate(layout, parent, false);
return new MyViewHolder(v);
}
@Override
public void onBindViewHolder(final MyViewHolder myViewHolder, final int position) {
final int pos = myViewHolder.getAdapterPosition();
if (pos == -1) {
return;
}
final RecyclerViewItem item = ArrayList.get(pos);
switch (item.getType()) {
case RecyclerViewItem.USER_PROFILE:
//By type you want to do differently.
break;
case RecyclerViewItem.OTHER_USER_PROFILE:
//By type you want to do differently.
break;
case RecyclerViewItem.DATE:
//By type you want to do differently.
break;
}
}
如果您有任何其他问题,请通过评论让我知道。没有像listview.addHeaderView这样简单的方法,但您可以通过向头适配器添加类型来实现这一点 这里有一个例子
public class HeaderAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private static final int TYPE_HEADER = 0;
private static final int TYPE_ITEM = 1;
String[] data;
public HeaderAdapter(String[] data) {
this.data = data;
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
if (viewType == TYPE_ITEM) {
//inflate your layout and pass it to view holder
return new VHItem(null);
} else if (viewType == TYPE_HEADER) {
//inflate your layout and pass it to view holder
return new VHHeader(null);
}
throw new RuntimeException("there is no type that matches the type " + viewType + " + make sure your using types correctly");
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof VHItem) {
String dataItem = getItem(position);
//cast holder to VHItem and set data
} else if (holder instanceof VHHeader) {
//cast holder to VHHeader and set data for header.
}
}
@Override
public int getItemCount() {
return data.length + 1;
}
@Override
public int getItemViewType(int position) {
if (isPositionHeader(position))
return TYPE_HEADER;
return TYPE_ITEM;
}
private boolean isPositionHeader(int position) {
return position == 0;
}
private String getItem(int position) {
return data[position - 1];
}
class VHItem extends RecyclerView.ViewHolder {
TextView title;
public VHItem(View itemView) {
super(itemView);
}
}
class VHHeader extends RecyclerView.ViewHolder {
Button button;
public VHHeader(View itemView) {
super(itemView);
}
}
}
这不管用。第一项仍然被替换。我不断得到未知的类类型\u项和未知的类类型\u头。