用RecycleView来实现布局形式。默认仅仅能指定一种布局格式。可是实际中我们的布局常常会用到多种类型的布局方式。怎样实现呢？

今天来说下经常使用的2钟方式。

第一种：

通过自己定义addHeadView方法来加入头布局

RecycleViewWithHead.java

import android.app.Activity;import android.os.Bundle;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.GridLayoutManager.SpanSizeLookup;import android.support.v7.widget.RecyclerView;import android.view.View;public class RecycleViewWithHead extends Activity {	private RecyclerView rcv;	// 当前的条目是recyclerView的头布局	public static final int HEADER_RECYCLER_VIEW_ITEM = 0;	// 当前的条目是普通recyclerView的条目	public static final int NORMAL_RECYCLER_VIEW_ITEM = 1;	@Override	protected void onCreate(Bundle savedInstanceState) {		// TODO Auto-generated method stub		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_recycle);		rcv = (RecyclerView) findViewById(R.id.rcv);		// 设置布局管理		GridLayoutManager manager = new GridLayoutManager(this, 2);		// 设置布局管理一条数据占用几行，假设是头布局则头布局自己占用一行		manager.setSpanSizeLookup(new SpanSizeLookup() {			@Override			public int getSpanSize(int postion) {				if (postion == 0) {					return 2;				} else {					return 1;				}			}		});		rcv.setLayoutManager(manager);		MyRecycleAdapter adapter = new MyRecycleAdapter(				RecycleViewWithHead.this, 20);		View view = View.inflate(this, R.layout.head, null);		adapter.addHeadView(view);		rcv.setAdapter(adapter);	}}

布局文件activity_recycle.xml

头布局文件head.xml

xml version="1.0" encoding="utf-8"?

> <RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent" android:layout_height="match_parent" > <ImageView android:id="@+id/iv_head" android:layout_width="80dp" android:layout_height="80dp" android:layout_margin="10dp" android:src="@drawable/head" /> <TextView android:id="@+id/tv_head" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignTop="@+id/iv_head" android:layout_toRightOf="@+id/iv_head" android:text="这是一张熊猫的图片" /> <ImageView android:id="@+id/iv_head_bottom" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_alignBottom="@+id/iv_head" android:layout_toRightOf="@+id/iv_head" android:src="@drawable/type" /> </RelativeLayout>

适配器MyRecycleAdapter.java

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.ViewGroup;import android.widget.Toast;public class MyRecycleAdapter extends		RecyclerView.Adapter
     
       {	private View headView;	private Context mContext;	private int count;	MyRecycleAdapter(Context mContext, int count) {		this.count = count;		this.mContext = mContext;	}	/**	 * 设置数据源总的条目	 */	@Override	public int getItemCount() {		//返回条目数加头布局个数		return count + 1;	}	@Override	public void onBindViewHolder(MyRecycleAdapterHolder holder,			final int position) {		int itemViewType = getItemViewType(position);		// 头部		if (itemViewType == RecycleViewWithHead.HEADER_RECYCLER_VIEW_ITEM) {			return;		} else if (itemViewType == RecycleViewWithHead.NORMAL_RECYCLER_VIEW_ITEM) {//普通条目			holder.iv_item_icon.setOnClickListener(new OnClickListener() {				@Override				public void onClick(View v) {					Toast.makeText(mContext, (position - 1) + "", 0).show();				}			});		}	}	@Override	public MyRecycleAdapterHolder onCreateViewHolder(ViewGroup parent,			int viewType) {		View root = null;		if (viewType == RecycleViewWithHead.HEADER_RECYCLER_VIEW_ITEM) {			root = headView;		} else {			root = LayoutInflater.from(mContext).inflate(R.layout.item, parent,					false);		}		return new MyRecycleAdapterHolder(root, viewType);	}	/**	 * 加入自己定义头部	 */	public void addHeadView(View view) {		this.headView = view;	}	@Override	public int getItemViewType(int position) {		if (position == 0) {			return RecycleViewWithHead.HEADER_RECYCLER_VIEW_ITEM;		} else {			return RecycleViewWithHead.NORMAL_RECYCLER_VIEW_ITEM;		}	}}
     

普通条目的布局文件item.xml

普通条目的ViewHolder

import android.support.v7.widget.RecyclerView;import android.view.View;import android.widget.ImageView;import android.widget.TextView;public class MyRecycleAdapterHolder extends RecyclerView.ViewHolder{		public ImageView iv_item_icon;	public TextView tv_item;	public MyRecycleAdapterHolder(View itemView) {		super(itemView);	}	public MyRecycleAdapterHolder(View itemView,int viewType) {		super(itemView);		initView(itemView,viewType);	}	private void initView(View itemView, int viewType) {		iv_item_icon = (ImageView) itemView.findViewById(R.id.iv_item_icon);		tv_item = (TextView) itemView.findViewById(R.id.tv_item);	}}

效果图:

另一种情况类似于淘宝的商品展示我们能够切换每行显示的数量，事实上也非常easy

先看下要实现的效果：

我先说下大致的实现思路：

1.给adapter设置一个当前显示多行还是单行的标记。

2.每次切换视图时重置标记。并重置RecycleView的LayoutManager。

3.调用adapter.notifyItemRangeChanged(2, adapter.getItemCount());（第一个參数是动画開始的位置索引）

好了再来看下RecycleViewWithHead.java

import com.example.myrecycleviewdemo.adapter.MyRecycleAdapter;import android.app.Activity;import android.os.Bundle;import android.support.v7.widget.GridLayoutManager;import android.support.v7.widget.GridLayoutManager.SpanSizeLookup;import android.support.v7.widget.RecyclerView;import android.view.View;import android.view.View.OnClickListener;import android.widget.ImageView;public class RecycleViewWithHead extends Activity implements OnClickListener {	private RecyclerView rcv;	// 当前的条目是recyclerView的头布局	public static final int HEADER_RECYCLER_VIEW_ITEM = 0;	// 当前的条目是普通recyclerView的条目	public static final int NORMAL_RECYCLER_VIEW_ITEM = 1;	// 一行显示一个	public static final int RECYCLER_VIEW_ITEM_SINGLE = 3;	// 一行显示两个	public static final int RECYCLER_VIEW_ITEM_DOUBLE = 4;	private ImageView iv_switch;// 视图转换	private MyRecycleAdapter adapter;	private GridLayoutManager manager;	@Override	protected void onCreate(Bundle savedInstanceState) {		// TODO Auto-generated method stub		super.onCreate(savedInstanceState);		setContentView(R.layout.activity_recycle);		rcv = (RecyclerView) findViewById(R.id.rcv);		iv_switch = (ImageView) findViewById(R.id.iv_switch);		iv_switch.setOnClickListener(this);		manager = new GridLayoutManager(this, 2);		// 设置布局管理一条数据占用几行，假设是头布局则头布局自己占用一行		manager.setSpanSizeLookup(new SpanSizeLookup() {			@Override			public int getSpanSize(int postion) {				if (postion == 0) {					return 2;				} else {					return 1;				}			}		});		rcv.setLayoutManager(manager);		adapter = new MyRecycleAdapter(RecycleViewWithHead.this, 20);		View view = View.inflate(this, R.layout.head, null);		// 设置当前ViewType		adapter.setSpanSize(RecycleViewWithHead.RECYCLER_VIEW_ITEM_DOUBLE);		adapter.addHeadView(view);		rcv.setAdapter(adapter);	}	@Override	public void onClick(View v) {		switch (v.getId()) {		case R.id.iv_switch:			changeRecycleViewList();			break;		default:			break;		}	}	/**	 * 改变RecycleView的显示列数	 */	private void changeRecycleViewList() {		if (adapter != null) {			int spanSize = adapter.getSpanSize();			// 当前一行显示一列			if (spanSize == RecycleViewWithHead.RECYCLER_VIEW_ITEM_SINGLE) {				manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {					@Override					public int getSpanSize(int position) {						if (adapter.getItemViewType(position) == RecycleViewWithHead.HEADER_RECYCLER_VIEW_ITEM) {							return 2;						} else {							return 1;						}					}				});				adapter.setSpanSize(RecycleViewWithHead.RECYCLER_VIEW_ITEM_DOUBLE);			}			// 当前一行显示两列			else if (spanSize == RecycleViewWithHead.RECYCLER_VIEW_ITEM_DOUBLE) {				manager.setSpanSizeLookup(new GridLayoutManager.SpanSizeLookup() {					@Override					public int getSpanSize(int position) {						if (adapter.getItemViewType(position) == RecycleViewWithHead.HEADER_RECYCLER_VIEW_ITEM) {							return 2;						} else {							return 2;						}					}				});				adapter.setSpanSize(RecycleViewWithHead.RECYCLER_VIEW_ITEM_SINGLE);			}			// 第一个參数是动画開始的位置索引			adapter.notifyItemRangeChanged(2, adapter.getItemCount());		}	}}

布局文件activity_recycle.xml

适配器MyRecycleAdapter.java

import com.example.myrecycleviewdemo.R;import com.example.myrecycleviewdemo.RecycleViewWithHead;import com.example.myrecycleviewdemo.R.layout;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.ViewGroup;import android.widget.Toast;public class MyRecycleAdapter extends		RecyclerView.Adapter
     
       {	public View headView;	public Context mContext;	public int count;	private int spanSize;// 当前每行显示几列	public MyRecycleAdapter(Context mContext, int count) {		this.count = count;		this.mContext = mContext;	}	/**	 * 设置数据源总的条目	 */	@Override	public int getItemCount() {		// 返回条目数加头布局个数		return count + 1;	}	@Override	public void onBindViewHolder(MyRecycleAdapterHolder holder,			final int position) {		int itemViewType = getItemViewType(position);		// 头部		if (itemViewType == RecycleViewWithHead.HEADER_RECYCLER_VIEW_ITEM) {			return;		} else {// 普通条目			if (itemViewType == RecycleViewWithHead.RECYCLER_VIEW_ITEM_DOUBLE) {// 一行两列视图				holder.iv_item_icon.setOnClickListener(new OnClickListener() {					@Override					public void onClick(View v) {						Toast.makeText(mContext, "2列。" + (position - 1) + "", 0)								.show();					}				});			} else if (itemViewType == RecycleViewWithHead.RECYCLER_VIEW_ITEM_SINGLE) {// 一行一列视图				holder.iv_item_icon_single.setOnClickListener(new OnClickListener() {					@Override					public void onClick(View v) {						Toast.makeText(mContext,"单列，" + (position - 1) + "", 0).show();					}				});			}		}	}	@Override	public MyRecycleAdapterHolder onCreateViewHolder(ViewGroup parent,			int viewType) {		View root = null;		// 头部		if (viewType == RecycleViewWithHead.HEADER_RECYCLER_VIEW_ITEM) {			root = headView;		} else {// 普通条目			/** 一行显示一条 */			if (viewType == RecycleViewWithHead.RECYCLER_VIEW_ITEM_SINGLE) {				root = LayoutInflater.from(mContext).inflate(R.layout.item_single, parent, false);			}			/** 一行显示两条 */			else {				root = LayoutInflater.from(mContext).inflate(R.layout.item_double, parent, false);			}		}		return new MyRecycleAdapterHolder(root, viewType);	}	/**	 * 加入自己定义头部	 */	public void addHeadView(View view) {		this.headView = view;	}	@Override	public int getItemViewType(int position) {		if (position == 0) {			return RecycleViewWithHead.HEADER_RECYCLER_VIEW_ITEM;		} else {			/** 一行显示一条 */			if (spanSize == RecycleViewWithHead.RECYCLER_VIEW_ITEM_SINGLE) {				return RecycleViewWithHead.RECYCLER_VIEW_ITEM_SINGLE;				/** 一行显示两条 */			} else {				return RecycleViewWithHead.RECYCLER_VIEW_ITEM_DOUBLE;			}		}	}	public int getSpanSize() {		return spanSize;	}	public void setSpanSize(int spanSize) {		this.spanSize = spanSize;	}}
     

普通条目的ViewHolder

import com.example.myrecycleviewdemo.R;import com.example.myrecycleviewdemo.R.id;import com.example.myrecycleviewdemo.RecycleViewWithHead;import android.support.v7.widget.RecyclerView;import android.view.View;import android.widget.ImageView;import android.widget.TextView;public class MyRecycleAdapterHolder extends RecyclerView.ViewHolder{	//一行两列视图	public ImageView iv_item_icon;	public TextView tv_item;		//一行一列视图	public ImageView iv_item_icon_single;	public TextView tv_item_single;		public MyRecycleAdapterHolder(View itemView) {		super(itemView);	}	public MyRecycleAdapterHolder(View itemView,int viewType) {		super(itemView);		initView(itemView,viewType);	}	private void initView(View itemView, int viewType) {		if(viewType == RecycleViewWithHead.RECYCLER_VIEW_ITEM_DOUBLE){			iv_item_icon = (ImageView) itemView.findViewById(R.id.iv_item_icon);			tv_item = (TextView) itemView.findViewById(R.id.tv_item);		}else if(viewType == RecycleViewWithHead.RECYCLER_VIEW_ITEM_SINGLE){			iv_item_icon_single = (ImageView) itemView.findViewById(R.id.iv_item_icon_single);			tv_item_single = (TextView) itemView.findViewById(R.id.tv_item_single);		}	}}

头布局文件head.xm没有不论什么变化

条目的布局拆分为2个item_double.xml和item_single.xml

item_double.xml和之前的item.xml一样。

item_single.xml

xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/ll_list" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_marginLeft="2dp" android:layout_marginRight="2dp" android:layout_marginTop="5dp" android:orientation="horizontal" > <ImageView android:id="@+id/iv_item_icon_single" android:layout_width="wrap_content" android:layout_height="wrap_content" android:src="@drawable/item" /> <TextView android:id="@+id/tv_item_single" android:layout_width="wrap_content" android:layout_height="wrap_content" android:layout_gravity="center_vertical" android:layout_marginTop="5dp" android:text="这是一仅仅熊猫" /> </LinearLayout>

源代码地址：http://download.csdn.net/detail/linder_qzy/9491370