Android之初探RecyclerView

RecyclerView的出现是为了取代ListView和GirdView，因为其可以实现ListView和GirdView的效果，也可以拓展很多效果，而且RecyclerView也做了很多优化。

其使用方法是先通过设置布局管理器来确定布局，然后在通过适配器来将数据和试图进行绑定。这里我举个类似于瀑布流的小例子。

项目地址：http://download.csdn.net/detail/l_vaule/9519118

package com.example.recycleviewtest;/* * Copyright (C) 2014 The Android Open Source Project * * Licensed under the Apache License, Version 2.0 (the "License"); * you may not use this file except in compliance with the License. * You may obtain a copy of the License at * *      http://www.apache.org/licenses/LICENSE-2.0 * * Unless required by applicable law or agreed to in writing, software * distributed under the License is distributed on an "AS IS" BASIS, * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. * See the License for the specific language governing permissions and * limitations under the License. */import android.content.Context;import android.content.res.TypedArray;import android.graphics.Canvas;import android.graphics.Rect;import android.graphics.drawable.Drawable;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.util.Log;import android.view.View;/** * This class is from the v7 samples of the Android SDK. It's not by me! * <p/> * See the license above for details. */public class DividerItemDecoration extends RecyclerView.ItemDecoration{private static final int[] ATTRS = new int[] { android.R.attr.listDivider };public static final int HORIZONTAL_LIST = LinearLayoutManager.HORIZONTAL;public static final int VERTICAL_LIST = LinearLayoutManager.VERTICAL;private Drawable mDivider;private int mOrientation;public DividerItemDecoration(Context context, int orientation){final TypedArray a = context.obtainStyledAttributes(ATTRS);mDivider = a.getDrawable(0);a.recycle();setOrientation(orientation);}public void setOrientation(int orientation){if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST){throw new IllegalArgumentException("invalid orientation");}mOrientation = orientation;}@Overridepublic void onDraw(Canvas c, RecyclerView parent){Log.v("tz", "onDraw()"); if (mOrientation == VERTICAL_LIST) {            drawVertical(c, parent);        } else {            drawHorizontal(c, parent);        }}public void drawVertical(Canvas c, RecyclerView parent){final int left = parent.getPaddingLeft();final int right = parent.getWidth() - parent.getPaddingRight();final int childCount = parent.getChildCount();for (int i = 0; i < childCount; i++){final View child = parent.getChildAt(i);RecyclerView v = new RecyclerView(parent.getContext());final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();final int top = child.getBottom() + params.bottomMargin;final int bottom = top + mDivider.getIntrinsicHeight();mDivider.setBounds(left, top, right, bottom);mDivider.draw(c);}}public void drawHorizontal(Canvas c, RecyclerView parent){final int top = parent.getPaddingTop();final int bottom = parent.getHeight() - parent.getPaddingBottom();final int childCount = parent.getChildCount();for (int i = 0; i < childCount; i++){final View child = parent.getChildAt(i);final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child.getLayoutParams();final int left = child.getRight() + params.rightMargin;final int right = left + mDivider.getIntrinsicHeight();mDivider.setBounds(left, top, right, bottom);mDivider.draw(c);}}/** * 为我们的Item预留空间  因为我们的recyclerView默认item间是不留空间的 * @param outRect * @param itemPosition * @param parent */@Overridepublic void getItemOffsets(Rect outRect, int itemPosition,RecyclerView parent){if (mOrientation == VERTICAL_LIST){outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());} else{outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);}}}

package com.example.recycleviewtest;import java.util.ArrayList;import java.util.List;import android.os.Bundle;import android.support.v7.app.ActionBarActivity;import android.support.v7.widget.DefaultItemAnimator;import android.support.v7.widget.LinearLayoutManager;import android.support.v7.widget.RecyclerView;import android.support.v7.widget.StaggeredGridLayoutManager;import android.view.Menu;import android.view.MenuItem;public class MainActivity extends ActionBarActivity {private RecyclerView recyclerView;private List<String> mData;@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);recyclerView = (RecyclerView) findViewById(R.id.recyclerView);initData();initView();}private void initView() {//1,设置线性布局容器        recyclerView.setLayoutManager(new LinearLayoutManager(this));        //2,设置gridView布局容器        // recyclerView.setLayoutManager(new GridLayoutManager(this,4));        recyclerView.setAdapter(new MyAdapter(mData, this));        //3,添加分割线  gitHub  DividerItemDecoration       recyclerView.addItemDecoration(new DividerItemDecoration(this, LinearLayoutManager.VERTICAL));  }private void initData() {mData = new ArrayList<>();for (int i = 0; i < 10; i++) {mData.add("I'm handsome");}}@Overridepublic boolean onCreateOptionsMenu(Menu menu) {// Inflate the menu; this adds items to the action bar if it is present.getMenuInflater().inflate(R.menu.main, menu);return true;}@Overridepublic boolean onOptionsItemSelected(MenuItem item) {// Handle action bar item clicks here. The action bar will// automatically handle clicks on the Home/Up button, so long// as you specify a parent activity in AndroidManifest.xml.int id = item.getItemId();if (id == R.id.action_settings) {recyclerView.removeAllViews();recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));recyclerView.setAdapter(new StaggerAdapter(this, mData)); //添加条目或者删除条目的动画 ----- 系统已经提供了默认的动画  我们也可以自己写  gitHub        recyclerView.setItemAnimator(new DefaultItemAnimator());return true;}return super.onOptionsItemSelected(item);}}

package com.example.recycleviewtest;import java.util.List;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; /** * @author ctt: * @version 创建时间：2016年5月12日  * 类说明 */public class MyAdapter extends RecyclerView.Adapter<MyAdapter.ViewHolder>{private List<String> mData;private Context context;public MyAdapter(List<String> mData, Context context) {super();this.mData = mData;this.context = context;}@Overridepublic int getItemCount() {// TODO Auto-generated method stubreturn mData.size();}@Overridepublic void onBindViewHolder(ViewHolder arg0, int arg1) {arg0.textView.setText(mData.get(arg1));}@Overridepublic ViewHolder onCreateViewHolder(ViewGroup arg0, int arg1) {View view = LayoutInflater.from(context).inflate(R.layout.layout_item, arg0,false);return new ViewHolder(view);}class ViewHolder extends RecyclerView.ViewHolder{TextView textView;public ViewHolder(View itemView) {super(itemView);textView = (TextView) itemView.findViewById(R.id.tv);}}}

package com.example.recycleviewtest;import java.util.ArrayList;import java.util.List;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;/** * @author ctt:  * @version 创建时间：2016年5月12日  * 类说明  */public class StaggerAdapter  extends RecyclerView.Adapter<StaggerAdapter.StgViewHolder>{private List<String> mDatas;    private LayoutInflater inflater;     private List<Integer> mHeights;    public StaggerAdapter(Context context,List<String> mDatas){        this.mDatas = mDatas;        this.inflater = LayoutInflater.from(context);        mHeights = new ArrayList<Integer>();        //随机为每一个item设置高度        for(int i=0;i<mDatas.size();i++){            mHeights.add((int)(100+Math.random()*300));        }    }    @Override    public StaggerAdapter.StgViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = inflater.inflate(R.layout.layout_item,parent,false);        return new StgViewHolder(view);    }        @Override    public void onBindViewHolder(StgViewHolder arg0, int arg1) {    //设置每一个item随机高度    ViewGroup.LayoutParams params = arg0.textView.getLayoutParams();    params.height = mHeights.get(arg1);    arg0.textView.setLayoutParams(params);    arg0.textView.setText(mDatas.get(arg1));    }      @Override    public int getItemCount() {        return mDatas.size();    }    /**     *  listView :ViewHolder     *      *  条目的布局：base_item     */    class StgViewHolder extends RecyclerView.ViewHolder{        TextView textView;        public StgViewHolder(View itemView) {            super(itemView);            textView = (TextView) itemView.findViewById(R.id.tv);        }    }}