RecyclerView的基本功能介绍：
1. 通过setLayoutManager方法可以设置布局，几个子类布局如下：
-> LinearLayoutManager(ListView形式的布局)
-> GridLayoutManager(GridView形式的布局)
-> StaggeredGridLayoutManager(瀑布流形式的布局，其实本质还是GridView，只是每个Item的高度不一样)
2. 通过addItemDecoration设置Item之间的分割线
3. 通过setItemAnimator设置添加，删除Item时的动画
本文由于需要展示ListView，Vertical GridView，Horizontal GridView和Staggered(瀑布流)，所以就不设置Item之间的分割线，直接在XML中设置Item的间距替代。
主界面的布局(activity_main)：
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
xmlns:tools="http://schemas.android.com/tools"
android:layout_width="match_parent"
android:layout_height="match_parent" >
<LinearLayout
android:id="@+id/id_layout_top"
android:layout_width="match_parent"
android:layout_height="wrap_content"
android:orientation="horizontal"
android:background="@android:color/darker_gray">
<Button
android:id="@+id/id_add"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="增加" />
<Button
android:id="@+id/id_delete"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="删除" />
<Button
android:id="@+id/id_menu"
android:layout_width="0dp"
android:layout_height="wrap_content"
android:layout_weight="1"
android:text="菜单>" />
</LinearLayout>
<android.support.v7.widget.RecyclerView
android:id="@+id/id_recyclerview"
android:layout_width="match_parent"
android:layout_height="match_parent"
android:layout_below="@id/id_layout_top" />
</RelativeLayout>Item的布局文件(item_recyclerview)：
<?xml version="1.0" encoding="utf-8"?>
<FrameLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="match_parent"
android:layout_height="50dp"
android:layout_margin="3dp"
android:background="@drawable/selector" >
<TextView
android:id="@+id/id_num"
android:layout_width="70dp"
android:layout_height="50dp"
android:layout_gravity="center"
android:gravity="center"
android:text="1" />
</FrameLayout>主界面Activity：
package com.example.testrecyclerview;
import java.util.ArrayList;
import java.util.List;
import android.app.Activity;
import android.app.AlertDialog;
import android.content.DialogInterface;
import android.os.Bundle;
import android.support.v7.widget.DefaultItemAnimator;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.LinearLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;
import android.widget.Button;
import android.widget.Toast;
import com.example.testrecyclerview.SimpleAdapter.OnItemClickListener;
public class MainActivity extends Activity implements
android.view.View.OnClickListener {
private RecyclerView mRecyclerView;
private List<String> mDatas;
private SimpleAdapter mAdapter;
private StaggeredAdapter mStaggeredAdapter;
private Button mAddBtn;
private Button mDeleteBtn;
private Button mMenuBtn;
private AlertDialog.Builder mBuilder;
private DialogInterface.OnClickListener mListener;
private int mType = 0;
private final int SIMPLE = 0;
private final int STAGGERED = 1;
@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);
initData();
initView();
addListener();
// 设置布局
mRecyclerView.setLayoutManager(new LinearLayoutManager(this,
LinearLayoutManager.VERTICAL, false));
// 设置动画
mRecyclerView.setItemAnimator(new DefaultItemAnimator());
}
protected void initData() {
mDatas = new ArrayList<String>();
for (int i = 'A'; i < 'z'; i++) {
mDatas.add("" + (char) i);
}
}
private void initView() {
mAddBtn = (Button) findViewById(R.id.id_add);
mDeleteBtn = (Button) findViewById(R.id.id_delete);
mMenuBtn = (Button) findViewById(R.id.id_menu);
mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
mAdapter = new SimpleAdapter(this, mDatas);
mStaggeredAdapter = new StaggeredAdapter(this, mDatas);
mRecyclerView.setAdapter(mAdapter);
mListener = new DialogInterface.OnClickListener() {
@Override
public void onClick(DialogInterface dialog, int which) {
switch (which) {
case 0: // ListView
mType = SIMPLE;
mRecyclerView.setAdapter(mAdapter);
mRecyclerView.setLayoutManager(new LinearLayoutManager(
MainActivity.this, LinearLayoutManager.VERTICAL,
false));
break;
case 1: // Vertical GridView
mType = SIMPLE;
mRecyclerView.setAdapter(mAdapter);
mRecyclerView
.setLayoutManager(new StaggeredGridLayoutManager(3,
StaggeredGridLayoutManager.VERTICAL));
break;
case 2: // Horizontal GridView
mType = SIMPLE;
mRecyclerView.setAdapter(mAdapter);
mRecyclerView
.setLayoutManager(new StaggeredGridLayoutManager(5,
StaggeredGridLayoutManager.HORIZONTAL));
break;
case 3: // Staggered
mType = STAGGERED;
mRecyclerView.setAdapter(mStaggeredAdapter);
mRecyclerView
.setLayoutManager(new StaggeredGridLayoutManager(3,
StaggeredGridLayoutManager.VERTICAL));
break;
default:
break;
}
}
};
String[] menu = { "ListView", "Vertical GridView",
"Horizontal GridView", "Staggered" };
mBuilder = new AlertDialog.Builder(this).setTitle("Menu").setItems(
menu, mListener);
}
private void addListener() {
mAddBtn.setOnClickListener(this);
mDeleteBtn.setOnClickListener(this);
mMenuBtn.setOnClickListener(this);
mAdapter.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemLongClick(View view, int position) {
mAdapter.deleteItem(position);
Toast.makeText(MainActivity.this, "long click:" + position,
Toast.LENGTH_SHORT).show();
}
@Override
public void onItemClick(View view, int position) {
Toast.makeText(MainActivity.this, "click:" + position,
Toast.LENGTH_SHORT).show();
}
});
mStaggeredAdapter.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemLongClick(View view, int position) {
mStaggeredAdapter.deleteItem(position);
Toast.makeText(MainActivity.this, "long click:" + position,
Toast.LENGTH_SHORT).show();
}
@Override
public void onItemClick(View view, int position) {
Toast.makeText(MainActivity.this, "click:" + position,
Toast.LENGTH_SHORT).show();
}
});
}
@Override
public void onClick(View v) {
switch (v.getId()) {
case R.id.id_add:
if (mType == SIMPLE) {
mAdapter.addItem(1);
} else {
mStaggeredAdapter.addItem(1);
}
break;
case R.id.id_delete:
if (mType == SIMPLE) {
mAdapter.deleteItem(1);
} else {
mStaggeredAdapter.deleteItem(1);
}
break;
case R.id.id_menu:
mBuilder.show();
break;
default:
break;
}
}
}代码中有两个Adapter，分别是SimpleAdapter和StaggeredAdapter，后一个Adapter主要是给瀑布流布局使用，因为其item的高度是随机的。
SimpleAdapter继承RecyclerView中的内置Adapter, 并且RecyclerView中强制用户使用ViewHolder，用户需要写一个RecyclerView中的ViewHolder：
package com.example.testrecyclerview;
import java.util.ArrayList;
import java.util.List;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup;
import android.widget.TextView;
public class SimpleAdapter extends
RecyclerView.Adapter<SimpleAdapter.SimpleViewHolder> {
protected List<String> mList;
protected Context mContext;
protected LayoutInflater mInflater;
protected OnItemClickListener mClickListener;
public SimpleAdapter(Context context, List<String> list){
this.mContext = context;
this.mInflater = LayoutInflater.from(context);
if (list != null){
this.mList = list;
}else {
mList = new ArrayList<String>();
}
}
@Override
public int getItemCount() {
// TODO Auto-generated method stub
return mList.size();
}
@Override
public void onBindViewHolder(final SimpleViewHolder holder, final int position) {
holder.mTextView.setText(mList.get(position));
if (mClickListener != null){
holder.itemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
int pos = holder.getPosition();
mClickListener.onItemClick(holder.itemView, pos);
}
});
holder.itemView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int pos = holder.getPosition();
mClickListener.onItemLongClick(holder.itemView, pos);
return false;
}
});
}
}
@Override
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int arg1) {
View view = mInflater.inflate(R.layout.item_recyclerview, parent, false);
SimpleViewHolder holder = new SimpleViewHolder(view);
return holder;
}
public void addItem(int position){
mList.add(position, "Insert one");
notifyItemInserted(position);
}
public void deleteItem(int position){
mList.remove(position);
notifyItemRemoved(position);
}
public void setOnItemClickListener(OnItemClickListener listener){
this.mClickListener = listener;
}
class SimpleViewHolder extends ViewHolder{
TextView mTextView;
public SimpleViewHolder(View view) {
super(view);
mTextView = (TextView) view.findViewById(R.id.id_num);
}
}
public interface OnItemClickListener{
void onItemClick(View view, int position);
void onItemLongClick(View view, int position);
}
}瀑布流的Adapter，继承自SimpleAdapter：
package com.example.testrecyclerview;
import java.util.ArrayList;
import java.util.List;
import com.example.testrecyclerview.SimpleAdapter.SimpleViewHolder;
import android.content.Context;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.RecyclerView.ViewHolder;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup.LayoutParams;
import android.widget.TextView;
public class StaggeredAdapter extends
SimpleAdapter {
protected List<Integer> mHeights;
public StaggeredAdapter(Context context, List<String> list){
super(context, list);
mHeights = new ArrayList<Integer>();
for (int i=0; i<mList.size(); i++){
mHeights.add((int) (100 + Math.random()*300));
}
}
@Override
public SimpleViewHolder onCreateViewHolder(ViewGroup parent, int arg1) {
View view = mInflater.inflate(R.layout.item_recyclerview, parent, false);
SimpleViewHolder holder = new SimpleViewHolder(view);
return holder;
}
@Override
public void onBindViewHolder(final SimpleViewHolder holder, final int position) {
LayoutParams lp = holder.mTextView.getLayoutParams();
lp.height = mHeights.get(position);
holder.mTextView.setLayoutParams(lp);
holder.mTextView.setText(mList.get(position));
if (mClickListener != null){
holder.itemView.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
int pos = holder.getPosition();
mClickListener.onItemClick(holder.itemView, pos);
}
});
holder.itemView.setOnLongClickListener(new OnLongClickListener() {
@Override
public boolean onLongClick(View v) {
int pos = holder.getPosition();
mClickListener.onItemLongClick(holder.itemView, pos);
return false;
}
});
}
}
}
需要注意的是，RecyclerView并没有实现点击事件，这需要我们自己写接口并去调用，这一点在Adapter中已经有体现
来源：oschina
链接：https://my.oschina.net/u/2532734/blog/541011