4：建立列表Item项的布局（2） item2.xml
<?xml version="1.0" encoding="utf-8"?> <android.support.v7.widget.CardView xmlns:card_view="http://www.easck.com/apk/res-auto" xmlns:android="http://www.easck.com/apk/res/android" android:layout_width="match_parent" android:layout_height="wrap_content" android:layout_margin="8dp" android:foreground="?android:attr/selectableItemBackground" card_view:cardCornerRadius="4dp" card_view:cardBackgroundColor="#E040FB" card_view:cardElevation="4dp" > <LinearLayout android:layout_width="match_parent" android:layout_height="wrap_content" android:orientation="vertical" > <TextView android:id="@+id/tv_item2_text" android:padding="20dp" android:textColor="#ffffff" android:layout_width="match_parent" android:layout_height="wrap_content"/> </LinearLayout> </android.support.v7.widget.CardView>
*最重要的部分 Adapter
5：建立RecyclerView的Adapter,RecyclerViewAdapter.java
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.TextView;
/**
* Created by Lijizhou on 2016/2/21.
*/
public class RecyclerViewAdapter extends RecyclerView.Adapter<RecyclerView.ViewHolder> {
private LayoutInflater mLayoutInflater;
private Context context;
private String [] titles;
//建立枚举 2个item 类型
public enum ITEM_TYPE {
ITEM1,
ITEM2
}
public RecyclerViewAdapter(Context context,String[] titles){
this.titles = titles;
this.context = context;
mLayoutInflater = LayoutInflater.from(context);
}
@Override
public RecyclerView.ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
//加载Item View的时候根据不同TYPE加载不同的布局
if (viewType == ITEM_TYPE.ITEM1.ordinal()) {
return new Item1ViewHolder(mLayoutInflater.inflate(R.layout.item1, parent, false));
} else {
return new Item2ViewHolder(mLayoutInflater.inflate(R.layout.item2, parent, false));
}
}
@Override
public void onBindViewHolder(RecyclerView.ViewHolder holder, int position) {
if (holder instanceof Item1ViewHolder) {
((Item1ViewHolder) holder).mTextView.setText(titles[position]);
} else if (holder instanceof Item2ViewHolder) {
((Item2ViewHolder) holder).mTextView.setText(titles[position]);
}
}
//设置ITEM类型，可以自由发挥，这里设置item position单数显示item1 偶数显示item2
@Override
public int getItemViewType(int position) {
//Enum类提供了一个ordinal()方法，返回枚举类型的序数，这里ITEM_TYPE.ITEM1.ordinal()代表0， ITEM_TYPE.ITEM2.ordinal()代表1
return position % 2 == 0 ? ITEM_TYPE.ITEM1.ordinal() : ITEM_TYPE.ITEM2.ordinal();
}
@Override
public int getItemCount() {
return titles == null ? 0 : titles.length;
}
//item1 的ViewHolder
public static class Item1ViewHolder extends RecyclerView.ViewHolder{
TextView mTextView;
public Item1ViewHolder(View itemView) {
super(itemView);
mTextView=(TextView)itemView.findViewById(R.id.tv_item1_text);
}
}
//item2 的ViewHolder
public static class Item2ViewHolder extends RecyclerView.ViewHolder{
TextView mTextView;
public Item2ViewHolder(View itemView) {
super(itemView);
mTextView=(TextView)itemView.findViewById(R.id.tv_item2_text);
}
}
}
