RecyclerView Multiple Layout
多布局是指一个不同的item用不同的layout显示。
在xml中声明一个RecyclerView：
<android.support.v7.widget.RecyclerView
android:layout_below="@id/toolbar"
android:id="@+id/recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView>
以及对应两种不同的item布局
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/country_withfirst"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical">
<linearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/country_item_first_background">
<TextView
android:id="@+id/country_first"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:gravity="left" />
</LinearLayout>
</LinearLayout>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:id="@+id/country_withoutfirst"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:background="@color/country_item_background"
android:orientation="horizontal"
android:paddingBottom="10dp"
android:paddingTop="10dp">
<TextView
android:id="@+id/country_item_normal_sum"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="10dp"
android:layout_weight="1"
android:gravity="left" />
<TextView
android:id="@+id/country_item_normal_count"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginRight="10dp"
android:layout_weight="1"
android:gravity="right"
android:textColor="@color/colorPrimary" />
</LinearLayout>
mainActivity中
recyclerView = (RecyclerView) findViewById(R.id.recyclerview);
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
recyclerView.setLayoutManager(layoutManager);
CountryAdapter adapter = new CountryAdapter(datas);
recyclerView.setAdapter(adapter);
实现自己的adapter
public class CountryAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
List<CountryEntity> mDataList;
CountryAdapter(List<CountryEntity> datas) {
this.mDataList = datas;
Log.d("CountryActivity", "datas.size=" + datas.size());
}
/**
* 渲染具体的ViewHolder
*
* @param viewGroup ViewHolder的容器
* @param i 一个标志，我们根据该标志可以实现渲染不同类型的ViewHolder
* @return
*/
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup viewGroup, int i) {
if (i == NORMAL_ITEM) {
return new NormalItemHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.country_withoutfirst, viewGroup, false));
} else {
return new GroupItemHolder(LayoutInflater.from(viewGroup.getContext()).inflate(R.layout.country_withfirst, viewGroup, false));
}
}
/**
* 绑定ViewHolder的数据。
*
* @param holder
* @param i 数据源list的下标
*/
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int i) {
if (holder instanceof NormalItemHolder) {
NormalItemHolder h = (NormalItemHolder) holder;
h.itemsum_normal.setText((datas.get(i)).getPublishDate());
h.itemcount_normal.setText("+" + (datas.get(i)).getCountrycount());
} else if (holder instanceof GroupItemHolder) {
GroupItemHolder h = (GroupItemHolder) holder;
h.itemfirst.setText((datas.get(i)).getItemFirst());
h.itemsum_group.setText((datas.get(i)).getPublishDate());
h.itemcount_group.setText("+" + (datas.get(i)).getCountrycount());
}
}
@Override
public int getItemCount() {
return mDataList.size();
}
/**
* 决定元素的布局使用哪种类型
*
* @param position 数据源List的下标
* @return 一个int型标志，传递给onCreateViewHolder的第二个参数
*/
@Override
public int getItemViewType(int position) {
//第一个都显示
if (position == 0)
return GROUP_ITEM;
String currentDate = mDataList.get(position).getPublishDate();
int prevIndex = position - 1;
boolean isDifferent = !(checkFirst(mDataList.get(prevIndex).getPublishDate()) == (checkFirst(currentDate)));
Log.d("CountryActivity","pre:"+mDataList.get(prevIndex).getPublishDate()+",now:"+currentDate);
Log.d("CountryActivity","prefirst:"+(char)(checkFirst(mDataList.get(prevIndex).getPublishDate()))+",now:"+(char)(checkFirst(currentDate)));
return isDifferent ? GROUP_ITEM : NORMAL_ITEM;
}
int checkFirst(String s) {
return (int)(new ChineseCharToEn().getFirstLetter(s).charAt(0));
}
@Override
public long getItemId(int position) {
return mDataList.get(position).getItemId();
}
对应两种不同的布局，实现两种不同的holder
/**
* 标准
*/
class NormalItemHolder extends RecyclerView.ViewHolder {
TextView itemsum_normal;
TextView itemcount_normal;
NormalItemHolder(View itemView) {
super(itemView);
itemsum_normal = (TextView) itemView.findViewById(R.id.country_item_normal_sum);
itemcount_normal = (TextView) itemView.findViewById(R.id.country_item_normal_count);
itemView.findViewById(R.id.country_withoutfirst).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent backintent = new Intent();
Log.d("CountryActivity", "putstring:" + itemsum_normal.getText());
backintent.putExtra("name", itemsum_normal.getText());
backintent.putExtra("count", itemcount_normal.getText());
setResult(0, backintent);
finish();
}
});
}
}
给每个item设置监听点击事件
/**
* 带首字母
*/
class GroupItemHolder extends RecyclerView.ViewHolder {
TextView itemfirst;
TextView itemsum_group;
TextView itemcount_group;
GroupItemHolder(View itemView) {
super(itemView);
itemfirst = (TextView) itemView.findViewById(R.id.country_first);
itemsum_group = (TextView) itemView.findViewById(R.id.country_item_group_sum);
itemcount_group = (TextView) itemView.findViewById(R.id.country_item_group_count);
itemView.findViewById(R.id.country_withfirst).setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
Intent backintent = new Intent();
Log.d("CountryActivity", "putstring:" + itemsum_group.getText());
backintent.putExtra("name", itemsum_group.getText());
backintent.putExtra("count",itemcount_group.getText());
setResult(0, backintent);
finish();
}
});
}
}
效果图如下：
