RecyclerView的使用之多种Item加载布局

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent">
<android.support.v7.widget.RecyclerView
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:id="@+id/rv_list"
/>
</LinearLayout>

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:layout_margin="8dp"
android:id="@+id/cv_item"
android:foreground="?android:attr/selectableItemBackground"
card_view:cardCornerRadius="4dp"
card_view:cardBackgroundColor="#ffffff"
card_view:cardElevation="4dp"
>
<LinearLayout
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="vertical"
>
<ImageView
android:id="@+id/iv_item1_pic"
android:layout_width="match_parent"
android:layout_height="120dp"
android:layout_weight="1"
android:background="@mipmap/lighthouse"
/>
<TextView
android:id="@+id/tv_item1_text"
android:padding="20dp"
android:layout_width="match_parent"
android:layout_height="wrap_content"/>
</LinearLayout>
</android.support.v7.widget.CardView>

<?xml version="1.0" encoding="utf-8"?>
<android.support.v7.widget.CardView
xmlns:card_view="http://schemas.android.com/apk/res-auto"
xmlns:android="http://schemas.android.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>

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);
}
}
}

import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
/**
* Created by Lijizhou on 2016/2/21.
*/
public class RecyclerViewActivity extends AppCompatActivity {
private RecyclerView mRecyclerView;
//item 显示所需(仅供DEMO)
private String[] title = {"Blog : http://blog.csdn.net/Leejizhou.",
"A good laugh and a long sleep are the best cures in the doctor's book.",
"all or nothing, now or never ",
"Be nice to people on the way up, because you'll need them on your way down.",
"Be confident with yourself and stop worrying what other people think. Do what's best for your future happiness!",
"Blessed is he whose fame does not outshine his truth.",
"Create good memories today, so that you can have a good past"
};
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_recyclerview);
mRecyclerView=(RecyclerView)findViewById(R.id.rv_list);
//这里根据上一个页面的传入值来加载LIST或GRID，上一个页面仅仅2个按钮，参考演示DEMO
if (getIntent().getIntExtra("type", 0) == 1){
//List
LinearLayoutManager layoutManager = new LinearLayoutManager(this);
layoutManager.setOrientation(LinearLayoutManager.VERTICAL);
mRecyclerView.setLayoutManager(layoutManager);
}else if(getIntent().getIntExtra("type", 0) == 2){
//grid
mRecyclerView.setLayoutManager(new GridLayoutManager(this, 2));
}
//RecyclerView设置Adapter
mRecyclerView.setAdapter(new RecyclerViewAdapter(this, title));
}
}