RecyclerView：打造自己熟悉的完美控件

标签：android   recyleview   listview   gridview   瀑布流   

      RecyclerView控件问世已经有很长的一段时间了，想必很多人对它的基本用法很熟悉了，再此就不赘述。它可以完美的替代ListView与GridView，纵向横向皆可，瀑布流也能搞定！这么多功能，只要这一个控件就可实现，想想都心动。个人而言，用起来的话还是稍显繁琐一些，所以自己动手打造一个熟悉完美的控件。

1.布局管理器：LayoutManger

  要用RecyclerView显示内容，LayoutManger是必不可少的，里面的方法setLayoutManger就是设置这个玩意的，但是对于可能一个不是很熟悉的控件，往往总会有遗漏的地方。在我们以往的ListView或者是GridView中，都没有设置过这个东西，所以咱就想了，可不可以重新继承RecyclerView自己打造一个类似Listview的控件，可以省去不必要的麻烦呢。

RecyclerView在调用方法setLayoutManger的时候已经获取到自己的实例，即不为null，

所以BaseRecycleView继承RecyclerView的时候在onFinishInflate中设置布局管理器，

这里我抽象出一个方法setFinalLayoutManger，可以根据需求自己定义。

public abstract void setFinalLayoutManger();

<span style="font-size:18px;"><span style="white-space:pre">	</span>@Override
	protected void onFinishInflate() {
		super.onFinishInflate();
		setFinalLayoutManger();
		addItemDecoration(new DividerItemDecoration(getContext()));
	}</span>

2.没有点击和长按事件，自己动手设置呗

(1)定义点击和长按事件接口

<span style="font-size:18px;"><span style="white-space:pre">	</span>//点击事件监听接口
	public interface OnItemClickListener{
		void onItemClick(View itemView,int position);
	}</span>

<span style="font-size:18px;"><span style="white-space:pre"></span><pre name="code" class="java"><span style="white-space:pre">	</span>//长按事件监听接口
	public interface OnLongItemClickListener{
		void onLongItemClick(View itemView,int position);
	}</span>

<span style="font-size:18px;"><span style="white-space:pre">	</span>public void setAdapter(Adapter adapter) {
		super.setAdapter(adapter);
		if(adapter instanceof BaseRecyleAdapter){
			BaseRecyleAdapter brAdapter = (BaseRecyleAdapter) adapter;
			if(mListener != null){
				brAdapter.setOnItemClickListener(mListener);
			}
			
			if(mLongListener != null){
				brAdapter.setOnLongItemClickListener(mLongListener);
			}
		}
	}
	
	/**
	 *设置行点击事件 
	 */
	public void setOnItemClickListener(OnItemClickListener listener){
		this.mListener = listener;
		@SuppressWarnings("rawtypes")
		BaseRecyleAdapter adapter = cast();
		adapter.setOnItemClickListener(mListener);
	}
	
	/**
	 *设置行长按事件 
	 */
	public void setOnLongClickListener(OnLongItemClickListener listener){
		this.mLongListener = listener;
		@SuppressWarnings("rawtypes")
		BaseRecyleAdapter adapter = cast();
		adapter.setOnLongItemClickListener(mLongListener);
	}
	
	/**
	 *获取继承自BaseRecyleAdapter的adapter 
	 */
	@SuppressWarnings("rawtypes")
	private BaseRecyleAdapter cast(){
		
		Adapter adapter = getAdapter();
		
		if(adapter != null){
			if(adapter instanceof BaseRecyleAdapter){
				BaseRecyleAdapter brAdapter = (BaseRecyleAdapter) adapter;
				return brAdapter;
			}else{
				throw new ClassCastException("getAdapter() from recyclerView can not cast BaseRecyleAdapter," +
						"so userd adapter should extends BaseRecyleAdapter");
			}
		}
		return null;
	}</span>

基本的BaseRecycleView已经基本竣工了，接下来就是实现自己需要的FinalRecycleView的重构了

3.打造自己满意的FinalRecycleView(继承自BaseRecycleView)

(1)这个FinalRecycleView是一个多样化的RecycleView，所以用到了自定义属性。在res/values中创建attrs.xml

<span style="font-size:18px;"><span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<resources>
    
    <declare-styleable name="FinalRecycleViewStyle">
        <attr name="showStyle" format="integer"/> <!-- 显示形式,list or grid -->
        <attr name="spanCount" format="integer"/> <!-- grid列数 -->
    </declare-styleable>
    
    
</resources></span></span>

(2)在res/values中创建integer.xml（用来表示attrs中showStyle的）

<span style="font-size:18px;"><?xml version="1.0" encoding="utf-8"?>
<resources>
    <integer name="LISTVIEW_VERTICAL">1000</integer>
    <integer name="LISTVIEW_HORIZONTAL">1001</integer>
    <integer name="GRIDVIEW_NORMAL">1002</integer>
    <integer name="STAGGERED_HORIZONTAL">1003</integer>
    <integer name="STAGGERED_VERTICAL">1004</integer>
</resources></span>

(4)最关键的方法到了，setFinalLayoutManger，这个就是我们在BaseRecyleView中抽象方法，setlayoutManger就在这里面进行设置了。

<span style="font-size:18px;">        if(showStyle == res.getInteger(R.integer.LISTVIEW_VERTICAL)){
	<span style="white-space:pre">	</span>setLayoutManager(new LinearLayoutManager(mContext));
	}else if(showStyle == res.getInteger(R.integer.LISTVIEW_HORIZONTAL)){
		setLayoutManager(new LinearLayoutManager(mContext, LinearLayoutManager.HORIZONTAL, false));
	}else if(showStyle == res.getInteger(R.integer.GRIDVIEW_NORMAL)){
		setLayoutManager(new GridLayoutManager(mContext, spanCount));
	}else if(showStyle == res.getInteger(R.integer.STAGGERED_HORIZONTAL)){
		setLayoutManager(new StaggeredGridLayoutManager(spanCount, StaggeredGridLayoutManager.HORIZONTAL));
	}else if(showStyle == res.getInteger(R.integer.STAGGERED_VERTICAL)){
		setLayoutManager(new StaggeredGridLayoutManager(spanCount, StaggeredGridLayoutManager.VERTICAL));
	}</span>

4.FinalRecycleView打造完成，接下来就是FinalViewHolder，这个很简单，直接继承RecyclerView.ViewHolder代码如下:

<span style="font-size:18px;">package com.dandy.recycleview;

import android.support.v7.widget.RecyclerView;
import android.util.SparseArray;
import android.view.View;
import android.widget.TextView;

public class FinalViewHolder extends RecyclerView.ViewHolder{

	private View mConvertView;
	private SparseArray<View> mViews;
	
	public FinalViewHolder(View view) {
		super(view);
		this.mConvertView = view;
		this.mViews = new SparseArray<View>();
	}
	
	/**
	 * 通过控件的Id获取对于的控件，如果没有则加入views
	 * @param viewId
	 * @return
	 */
	@SuppressWarnings("unchecked")
	public <T extends View> T getView(int viewId) {
		View view = mViews.get(viewId);
		if (view == null) {
			view = mConvertView.findViewById(viewId);
			mViews.put(viewId, view);
		}
		return (T) view;
	}
	
	/**
	 * 为TextView设置字符串
	 * @param viewId
	 * @param text
	 * @param visible
	 * @return
	 */
	public void setText(int viewId, String text) {
		TextView view = getView(viewId);
		if(view != null && text != null){
			view.setText(text);
		}
	}
	
	public View getContentView(){
		return mConvertView;
	}
	
}
</span>

onBindViewHolder方法中设置监听事件，这部分比较简单，代码如下：

<span style="font-size:18px;">package com.dandy.recycleview;

import java.util.List;
import com.dandy.recycleview.BaseRecycleView.OnItemClickListener;
import com.dandy.recycleview.BaseRecycleView.OnLongItemClickListener;

import android.content.Context;
import android.support.v7.widget.RecyclerView.Adapter;
import android.view.LayoutInflater;
import android.view.View;
import android.view.View.OnLongClickListener;
import android.view.ViewGroup;
import android.view.View.OnClickListener;

public abstract class BaseRecyleAdapter <T> extends Adapter<FinalViewHolder>{
	
	public OnItemClickListener mListener;
	public OnLongItemClickListener mLongListener;
	public Context mContext;
	public List<T> mDatas;
	public int itemLayoutId;
	
	public BaseRecyleAdapter(Context context,List<T> datas,int itemLayoutId) {
		this.mContext = context;
		this.mDatas = datas;
		this.itemLayoutId = itemLayoutId;
	}
	
	@Override
	public int getItemCount() {
		if(mDatas != null){
			return mDatas.size();
		}
		return 0;
	}
	
	@Override
	public FinalViewHolder onCreateViewHolder(ViewGroup viewGroup, int position) {
		View view = LayoutInflater.from(mContext).inflate(itemLayoutId,viewGroup,false);
		return new FinalViewHolder(view);
	}
	
	@Override
	public void onBindViewHolder(FinalViewHolder viewHolder, final int position) {
		viewHolder.getContentView().setOnClickListener(new OnClickListener() {
			
			@Override
			public void onClick(View v) {
				if(mListener != null){
					mListener.onItemClick(v, position);
				}
			}
		});
		
		viewHolder.getContentView().setOnLongClickListener(new OnLongClickListener() {
			
			@Override
			public boolean onLongClick(View v) {
				if(mLongListener != null){
					mLongListener.onLongItemClick(v, position);
					return true;
				}
				return false;
			}
		});
		
		convertBindViewHolder(viewHolder,position);
	}
	
	public abstract void convertBindViewHolder(FinalViewHolder viewHolder, final int position);
	
	public void setOnItemClickListener(OnItemClickListener listener){
		this.mListener = listener;
	}
	
	public void setOnLongItemClickListener(OnLongItemClickListener listener){
		this.mLongListener = listener;
	}
}
</span>

源代码下载链接

RecyclerView：打造自己熟悉的完美控件

标签：android   recyleview   listview   gridview   瀑布流   

原文地址：http://blog.csdn.net/tabolt/article/details/46894351