RecyclerView学习笔记

demo图

注意点：

1.add  delete等操作可以直接构造到adapter里面，然后通知刷新使用this.notifyItemInserted(pos);，确保有默认的刷新动画。

2.adapter中绑定View的onclick事件不直接使用view传进来的pos，因为随着add等操作  pos不立即更新，使用int realPos=holder.getLayoutPosition();

MainActivity.java

public class MainActivity extends Activity {
	private RecyclerView mRecyclerView;
	private List<String> mDatas;
	private LouisRecyclerViewAdapter mAdapter;

	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		initData();
		mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
		// LinearLayoutManager
		/**
		 * 系统提供了3个实现类： LinearLayoutManager 现行管理器，支持横向、纵向。 GridLayoutManager
		 * 网格布局管理器 StaggeredGridLayoutManager 瀑布就式布局管理器
		 */
		mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
		/*
		 * mRecyclerView.addItemDecoration(new DividerItemDecoration(this,
		 * DividerItemDecoration.VERTICAL_LIST));//简单的使用items.xml中android:
		 * layout_margin设置
		 */
		mAdapter = new LouisRecyclerViewAdapter(this, mDatas);
		mAdapter.setLouisOnItemClickListener(new louisOnItemClickListener() {

			@Override
			public void OnItemLongClick(View v, int pos) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "OnItemLongClick:pos=" + pos, 1).show();
			}

			@Override
			public void OnItemClick(View v, int pos) {
				// TODO Auto-generated method stub
				Toast.makeText(MainActivity.this, "OnItemClick:pos=" + pos, 1).show();
			}
		});
		mRecyclerView.setAdapter(mAdapter);
		mRecyclerView.setItemAnimator(new DefaultItemAnimator());// 默认动画 其他参考https://github.com/gabrielemariotti/RecyclerViewItemAnimators
	}

	protected void initData() {
		mDatas = new ArrayList<String>();
		for (int i = 'A'; i < 'z'; i++) {
			mDatas.add("" + (char) i);// (char)转换成字符
		}
	}

	@Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// TODO Auto-generated method stub
		getMenuInflater().inflate(R.menu.options_menu, menu);
		return true;
		// return super.onCreateOptionsMenu(menu);
	}

	@Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		int id = item.getItemId();
		switch (id) {
		case R.id.action_add:
			mAdapter.louisAdd(1);
			break;
		case R.id.action_delete:
			mAdapter.louisDelete(1);
			break;
		case R.id.action_listview:
			mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
			break;
		case R.id.action_gridview:
			mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));
			break;
		case R.id.action_gridview_hor:
			mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(5, StaggeredGridLayoutManager.HORIZONTAL));
			break;
		case R.id.action_staggered:
			Intent intent = new Intent(this, StaggeredActivity.class);
			startActivity(intent);
			break;
		default:
			break;
		}
		return super.onOptionsItemSelected(item);
	}
}

LouisRecyclerViewAdapter.java

public class LouisRecyclerViewAdapter extends RecyclerView.Adapter<LouisRecyclerViewAdapter.MyViewHolder> {
	public LouisRecyclerViewAdapter(Context mContext, List<String> mDatas) {
		super();
		this.mContext = mContext;
		this.mDatas = mDatas;
	}

	private Context mContext;
	protected List<String> mDatas;
//设置接口类
	public interface louisOnItemClickListener {
		//接口方法
		void OnItemClick(View v, int pos);

		void OnItemLongClick(View v, int pos);
	}

	private louisOnItemClickListener mLouisOnItemClickListener;

	public void setLouisOnItemClickListener(louisOnItemClickListener listener) {
		this.mLouisOnItemClickListener = listener;
	}

	@Override
	public MyViewHolder onCreateViewHolder(ViewGroup parent, int viewType) {
		MyViewHolder holder = new MyViewHolder(LayoutInflater.from(mContext).inflate(R.layout.items, parent, false));
		return holder;
	}

	@Override
	public void onBindViewHolder(final MyViewHolder holder, final int position) {
		holder.tv.setText(mDatas.get(position));
		// 绑定每一个itemView的事件  抽取方法 供子类复用
		setItemViewEvent(holder);
	}

	protected void setItemViewEvent(final MyViewHolder holder) {
		if (mLouisOnItemClickListener != null) {
			holder.itemView.setOnClickListener(new OnClickListener() {
				@Override
				public void onClick(View v) {
					// TODO Auto-generated method stub
					int realPos = holder.getLayoutPosition();
					mLouisOnItemClickListener.OnItemClick(holder.itemView, realPos);

				}
			});
			// 绑定每一个itemView的事件 LongClick
			holder.itemView.setOnLongClickListener(new OnLongClickListener() {

				@Override
				public boolean onLongClick(View v) {
					// TODO Auto-generated method stub
					int realPos = holder.getLayoutPosition();
					mLouisOnItemClickListener.OnItemLongClick(holder.itemView, realPos);
					return false;
				}
			});

		}
	}

	@Override
	public int getItemCount() {
		return mDatas.size();
	}

	void louisAdd(int pos) {
		mDatas.add(pos, "插入1条数据1");
		this.notifyItemInserted(pos);
	}

	void louisDelete(int pos) {
		mDatas.remove(pos);
		this.notifyItemRemoved(pos);
	}

	class MyViewHolder extends ViewHolder {

		TextView tv;

		public MyViewHolder(View view) {
			super(view);
			tv = (TextView) view.findViewById(R.id.id_num);
		}
	}
}

StaggeredActivity.java

public class StaggeredActivity extends Activity {
	 private RecyclerView mRecyclerView;
	 private List<String> mDatas;
	  private LouisRecyclerView4StaggeredAdapter mAdapter;
	@Override
	protected void onCreate(Bundle savedInstanceState) {
		super.onCreate(savedInstanceState);
		setContentView(R.layout.activity_main);
		  initData();
	        mRecyclerView = (RecyclerView) findViewById(R.id.id_recyclerview);
	        //LinearLayoutManager 
	        /**
	         * 系统提供了3个实现类：
LinearLayoutManager 现行管理器，支持横向、纵向。
GridLayoutManager 网格布局管理器
StaggeredGridLayoutManager 瀑布就式布局管理器
	         */
	        mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(3,StaggeredGridLayoutManager.VERTICAL));
	       /* mRecyclerView.addItemDecoration(new DividerItemDecoration(this,
	        		DividerItemDecoration.VERTICAL_LIST));//简单的使用items.xml中android:layout_margin设置*/
	        mAdapter = new LouisRecyclerView4StaggeredAdapter(this,mDatas);
	        mAdapter.setLouisOnItemClickListener(new louisOnItemClickListener() {
				
				@Override
				public void OnItemLongClick(View v, int pos) {
					// TODO Auto-generated method stub
					mAdapter.louisDelete(pos);
				}
				
				@Override
				public void OnItemClick(View v, int pos) {
					// TODO Auto-generated method stub
					mAdapter.louisDelete(pos);
				}
			});
	        mRecyclerView.setAdapter(mAdapter);
	}
	  protected void initData()
	    {
	        mDatas = new ArrayList<String>();
	        for (int i = 'A'; i < 'z'; i++)
	        {
	            mDatas.add("" + (char) i);//(char)转换成字符
	        }
	    }
	  @Override
	public boolean onCreateOptionsMenu(Menu menu) {
		// TODO Auto-generated method stub
		getMenuInflater().inflate(R.menu.options_menu, menu);
		return true;
		//return super.onCreateOptionsMenu(menu);
	}
	  @Override
	public boolean onOptionsItemSelected(MenuItem item) {
		// TODO Auto-generated method stub
		 int id=item.getItemId();
		  switch (id) {/*
		  case R.id.action_listview:
				mRecyclerView.setLayoutManager(new LinearLayoutManager(this));
				break;
		case R.id.action_gridview:
			mRecyclerView.setLayoutManager(new GridLayoutManager(this, 3));
			break;
		case R.id.action_gridview_hor:
			mRecyclerView.setLayoutManager(new StaggeredGridLayoutManager(5,StaggeredGridLayoutManager.HORIZONTAL));
			break;
		default:
			break;
		*/}
		return super.onOptionsItemSelected(item);
	}
}

LouisRecyclerView4StaggeredAdapter.java

public class LouisRecyclerView4StaggeredAdapter extends LouisRecyclerViewAdapter {
	private List<Integer> mHeights;

	public LouisRecyclerView4StaggeredAdapter(Context mContext, List<String> mDatas) {
		super(mContext, mDatas);
		// 模拟随机高度
		mHeights = new ArrayList<Integer>();
		for (int i = 0; i < mDatas.size(); i++) {
			mHeights.add((int) (100 + Math.random() * 300));
		}
	}

	@Override
	public void onBindViewHolder(MyViewHolder holder, int position) {
		LayoutParams mLayoutParams = holder.itemView.getLayoutParams();
		mLayoutParams.height = mHeights.get(position);
		holder.itemView.setLayoutParams(mLayoutParams);
		holder.tv.setText(mDatas.get(position));

		setItemViewEvent(holder);
	}

}

最后是开源的DividerItemDecoration

DividerItemDecoration.java

/*
 * Copyright (C) 2014 The Android Open Source Project
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * 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.support.v7.widget.RecyclerView.State;
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) {
        Log.v("recyclerview - itemdecoration", "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);
            android.support.v7.widget.RecyclerView v = new android.support.v7.widget.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);
        }
    }
}

<pre class="java" name="code">demo下载 ：<pre class="java" name="code">http://download.youkuaiyun.com/detail/richiezhu/9215923