Android程序设计-RecyclerView的使用

---------------------------------------------------------------我是一个帅帅的分割线-------------------------------------------------------

【案例】

小编将通过一个案例实现RecyclerView的使用，下面请看这个案例的实现效果

【关键步骤】

1.在布局文件中添加了对用的控件后，我们需要书写代码，既然和ListView肯定需要适配器，下面我们来看下适配器

package org.monster.recyclerviewdemo; 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 java.util.List; /**  * Created by monster on 2015/7/9.  * 继承RecyclerView，实现ListView的效果  * RecyclerView中google强烈要求使用ViewHolder  */ public class SimpleAdapter extends RecyclerView.Adapter<MyViewHolder>{  private List<String> mData;  private Context context;  private LayoutInflater mInflater;  /**   * 声明一个接口，用于实现点击事件   */  public interface  OnItemClickListener{   void OnItemClick(int position,View view);   void OnItemLongClick(int position,View view);  }  private OnItemClickListener mOnItemClickListener;  public  void setOnItemClickListener(OnItemClickListener listener){   this.mOnItemClickListener=listener;  }  /**构造方法的实现**/  public SimpleAdapter(List<String> mData,Context context){   this.mData=mData;   this.context=context;   mInflater=LayoutInflater.from(context);  }  /**   * 创建ViewHolder   * @param parent   * @param viewType   * @return   */  @Override  public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {   View view=mInflater.inflate(R.layout.recycler_item,parent,false);   MyViewHolder viewHolder=new MyViewHolder(view);   return viewHolder;  }  /**   * 绑定ViewHolder类,即给控件赋值   * @param holder   * @param position   */  @Override  public void onBindViewHolder(final MyViewHolder holder, final int position) {   holder.tv.setText(mData.get(position));   if (mOnItemClickListener!=null){    holder.itemView.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {      int LayoutPosition=holder.getLayoutPosition(); //得到布局的position      mOnItemClickListener.OnItemClick(LayoutPosition,holder.itemView);     }    });    //longclickListener    holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {     @Override     public boolean onLongClick(View v) {      int LayoutPosition=holder.getLayoutPosition(); //得到布局的position      mOnItemClickListener.OnItemLongClick(LayoutPosition,holder.itemView);      return false;     }    });   }  }  @Override  public int getItemCount() {   return mData.size();  }  public void addData(int position){   mData.add(position,"Insert One");   notifyItemInserted(position);  }  public void deleteData(int position){   mData.remove(position);   notifyItemRemoved(position);  } } /**  * ViewHolder类，这个类的作用主要用于实例化控件  */  class MyViewHolder extends RecyclerView.ViewHolder{   TextView tv; //声明控件   public MyViewHolder(View itemView) {    super(itemView);    /**初始化控件**/    tv= (TextView) itemView.findViewById(R.id.tv);   }  } 

ps:

2.我们来看下MainActivity中的代码：

package org.monster.recyclerviewdemo; import android.content.Intent; import android.support.v7.app.ActionBarActivity; 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.Menu; import android.view.MenuItem; import android.view.View; import android.widget.Switch; import android.widget.Toast; import java.util.ArrayList; import java.util.List; public class MainActivity extends ActionBarActivity {  private RecyclerView recyclerView;  private List<String> mDatas;  private SimpleAdapter adapter;  @Override  protected void onCreate(Bundle savedInstanceState) {   super.onCreate(savedInstanceState);   setContentView(R.layout.activity_main);   initDatas();   initView();   adapter=new SimpleAdapter(mDatas,this);   recyclerView.setAdapter(adapter);   //设置RecyclerView的布局管理   LinearLayoutManager layoutManager=new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);   recyclerView.setLayoutManager(layoutManager);   //设置RecyclerView的item间的分割线     // recyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST));   //设置RecyclerView的动画   recyclerView.setItemAnimator(new DefaultItemAnimator());   //设置监听事件   adapter.setOnItemClickListener(new SimpleAdapter.OnItemClickListener() {    @Override    public void OnItemClick(int position, View view) {     Toast.makeText(MainActivity.this,"Click: "+position,Toast.LENGTH_SHORT).show();    }    @Override    public void OnItemLongClick(int position, View view) {     Toast.makeText(MainActivity.this,"Long click: "+position,Toast.LENGTH_SHORT).show();    }   });  }  private void initView() {   recyclerView= (RecyclerView) findViewById(R.id.RecyclerView);  }  /**   * 加载数据源   */  private void initDatas() {   mDatas=new ArrayList<String>();   for(int i='A';i<'z';i++){    mDatas.add(" "+(char)i);   }  }  @Override  public boolean onCreateOptionsMenu(Menu menu) {   // Inflate the menu; this adds items to the action bar if it is present.   getMenuInflater().inflate(R.menu.menu_main, menu);   return true;  }  @Override  public 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();   switch (id){    case R.id.action_add:     adapter.addData(1);     break;    case R.id.action_delete:     adapter.deleteData(1);     break;    case R.id.action_listview:     recyclerView.setLayoutManager(new LinearLayoutManager(this));     break;    case R.id.action_gridview:     recyclerView.setLayoutManager(new GridLayoutManager(this,3));     break;    case R.id.action_hor_gridview:     recyclerView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.HORIZONTAL));     break;    case R.id.action_staggered:     Intent i=new Intent(this,StaggerActivity.class);     startActivity(i);     break;   }   return super.onOptionsItemSelected(item);  } } 

PS:

      设置RecyclerView的item间的分割线        recyclerView.addItemDecoration(new DividerItemDecoration(this,DividerItemDecoration.VERTICAL_LIST));

Comic Sans MS在分割线的部分我们需要引入github中的一个分割线文件：

package org.monster.recyclerviewdemo; /*  * 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;  }  @Override  public void onDraw(Canvas c, RecyclerView parent)  {    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);   }  }  @Override  public 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);   }  } } 

       //设置RecyclerView的布局管理         LinearLayoutManager layoutManager=new LinearLayoutManager(this,LinearLayoutManager.VERTICAL,false);         recyclerView.setLayoutManager(layoutManager);

      //设置RecyclerView的动画         recyclerView.setItemAnimator(new DefaultItemAnimator());

/**  * 声明一个接口，用于实现点击事件  */ public interface  OnItemClickListener{  void OnItemClick(int position,View view);  void OnItemLongClick(int position,View view); } private OnItemClickListener mOnItemClickListener; public  void setOnItemClickListener(OnItemClickListener listener){  this.mOnItemClickListener=listener; } /**构造方法的实现**/ public SimpleAdapter(List<String> mData,Context context){  this.mData=mData;  this.context=context;  mInflater=LayoutInflater.from(context); } 

/**   * 绑定ViewHolder类,即给控件赋值   * @param holder   * @param position   */  @Override  public void onBindViewHolder(final MyViewHolder holder, final int position) {   holder.tv.setText(mData.get(position));   if (mOnItemClickListener!=null){    holder.itemView.setOnClickListener(new View.OnClickListener() {     @Override     public void onClick(View v) {      int LayoutPosition=holder.getLayoutPosition(); //得到布局的position      mOnItemClickListener.OnItemClick(LayoutPosition,holder.itemView);     }    });    //longclickListener    holder.itemView.setOnLongClickListener(new View.OnLongClickListener() {     @Override     public boolean onLongClick(View v) {      int LayoutPosition=holder.getLayoutPosition(); //得到布局的position      mOnItemClickListener.OnItemLongClick(LayoutPosition,holder.itemView);      return false;     }    });   }  } 

//设置监听事件 adapter.setOnItemClickListener(new SimpleAdapter.OnItemClickListener() {  @Override  public void OnItemClick(int position, View view) {   Toast.makeText(MainActivity.this,"Click: "+position,Toast.LENGTH_SHORT).show();  }  @Override  public void OnItemLongClick(int position, View view) {   Toast.makeText(MainActivity.this,"Long click: "+position,Toast.LENGTH_SHORT).show();  } }); 

上述即为RecyclerView的简单实用，程序中的其他样式敬请参考【源码】

【视频】

【源码】