RecylerView的基本使用（个人备忘录）

一、添加依赖库

想要使用RecyclerView需要在Dependencies闭包中添加如下内容：

 compile 'com.android.support:recyclerview-v7:24.2.1'

二、在布局中创建RecyclerView控件：

       <android.support.v7.widget.RecyclerView        android:id="@+id/recyler_view"        android:layout_width="match_parent"        android:layout_height="match_parent"        app:layout_behavior="@string/appbar_scrolling_view_behavior" />

为RecyclerView设置item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="55dp"    android:background="@drawable/recycler_item_selector"    android:orientation="vertical">    <TextView        android:id="@+id/notes_content"        android:layout_width="match_parent"        android:layout_height="54.5dp"        android:ellipsize="end"        android:gravity="center_vertical"        android:paddingLeft="16sp"        android:singleLine="true"        android:text="hello lanbots"        android:textColor="#333333"        android:textSize="15sp" />    <View        android:layout_width="match_parent"        android:layout_height="0.5dp"        android:layout_marginLeft="16dp"        android:background="#dedede" /></LinearLayout>

三、RecyclerView的适配器：

package com.linbots.simplenotes.ui.adapter;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;import com.linbots.simplenotes.R;import com.linbots.simplenotes.db.Notes;import java.util.List;import butterknife.BindView;import butterknife.ButterKnife;/** * Created by LinBots on 2017/4/24. */public class NotesAdapter extends RecyclerView.Adapter<NotesAdapter.ViewHolder>  {    private Context context;    private List<Notes> mList;    public NotesAdapter(Context context, List<Notes> mList) {        this.context = context;        this.mList = mList;    }    static class ViewHolder extends RecyclerView.ViewHolder {        @BindView(R.id.notes_content)        TextView notesContent;        public ViewHolder(View itemView) {            super(itemView);            ButterKnife.bind(this, itemView);        }    }    @Override    public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {        View view = LayoutInflater.from(context).inflate(R.layout.item_notes, parent, false);        ViewHolder viewHolder = new ViewHolder(view);        return viewHolder;    }    @Override    public void onBindViewHolder(ViewHolder holder, int position) {        Notes notes = mList.get(position);        holder.notesContent.setText(notes.getContent());    }    @Override    public int getItemCount() {        return mList.size();    }}

四、Activity的代码如下：

    @BindView(R.id.recyler_view)    RecyclerView mRecyclerView;    private NotesAdapter mAdapter;

     LinearLayoutManager layoutManager = new LinearLayoutManager(this);     mRecyclerView.setLayoutManager(layoutManager);     mAdapter = new NotesAdapter(this, notes);     mRecyclerView.setAdapter(mAdapter);

RecyclerView的使用和ListView很相似。

RecyclerView需要通过setLayoutManager()方法设置布局管理器，RecyclerView有三个默认布局管理器LinearLayoutManager、GridLayoutManager、StaggeredGridLayoutManager，都支持横向和纵向排列以及反向滑动。如果想把RecyclerView改为横向滑动，也可以通过调用

     layoutManager.setOrientation(GridLayoutManager.HORIZONTAL);

RecyclerView不像ListView一样提供item的点击监听，所以我们只能自己实现。RecyclerView的item点击事件监听可以为item的view设置监听，也可以在mRecyclerView.addOnItemTouchListener里去判断手势来实现。

通过调用如下方法可以设置item加载或移除时的动画

    mRecyclerView.setItemAnimator(new DefaultItemAnimator());

五、效果图