android recycler添加分割线 点击事件等

Main类 package com.scout.myapplication; import android.support.v7.app.AppCompatActivity; import android.os.Bundle; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.View; import android.widget.Toast; import java.util.ArrayList; public class MainActivity extends AppCompatActivity { RecyclerView recyclerView; private RAdapter mAdapter; private RecyclerView.LayoutManager mLayoutManager; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); initData(); initView(); } private void initData() { mLayoutManager = new LinearLayoutManager(this, LinearLayoutManager.VERTICAL, false); mAdapter = new RAdapter(getData()); mAdapter.setOnItemClickListener(new RAdapter.OnItemClickListener() { @Override public void onItemClick(View view, int position) { Toast.makeText(MainActivity.this,"短按" + position + " item", Toast.LENGTH_SHORT).show(); } @Override public void onItemLongClick(View view, int position) { Toast.makeText(MainActivity.this,"长按 " + position + " item", Toast.LENGTH_SHORT).show(); } }); } private void initView() { recyclerView = (RecyclerView) findViewById(R.id.recyclertest); recyclerView.addItemDecoration(new MyDividerItemDecoration(this, LinearLayoutManager.VERTICAL)); // 设置布局管理器 recyclerView.setLayoutManager(mLayoutManager); // 设置adapter recyclerView.setAdapter(mAdapter); } private ArrayList<String> getData() { ArrayList<String> data = new ArrayList<>(); String temp = " item"; for(int i = 0; i < 20; i++) { data.add(i + temp); } return data; } } 分割线： package com.scout.myapplication; 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.v4.view.ViewCompat; import android.support.v7.widget.LinearLayoutManager; import android.support.v7.widget.RecyclerView; import android.view.View; /** * Created by liuguodong on 2017/8/30. */ public class MyDividerItemDecoration 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; /** * 用于绘制间隔样式 */ private Drawable mDivider; /** * 列表的方向，水平/竖直 */ private int mOrientation; public MyDividerItemDecoration(Context context, int orientation) { // 获取默认主题的属性 final TypedArray a = context.obtainStyledAttributes(ATTRS); mDivider = a.getDrawable(0); a.recycle(); setOrientation(orientation); } @Override public void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) { // 绘制间隔 if (mOrientation == VERTICAL_LIST) { drawVertical(c, parent); } else { drawHorizontal(c, parent); } } @Override public void getItemOffsets(Rect outRect, View view, RecyclerView parent, RecyclerView.State state) { if (mOrientation == VERTICAL_LIST) { outRect.set(0, 0, 0, mDivider.getIntrinsicHeight()); } else { outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0); } } private void setOrientation(int orientation) { if (orientation != HORIZONTAL_LIST && orientation != VERTICAL_LIST) { throw new IllegalArgumentException("invalid orientation"); } mOrientation = orientation; } /** * 绘制间隔 */ private 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); final RecyclerView.LayoutParams params = (RecyclerView.LayoutParams) child .getLayoutParams(); final int top = child.getBottom() + params.bottomMargin + Math.round(ViewCompat.getTranslationY(child)); final int bottom = top + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } } /** * 绘制间隔 */ private 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 + Math.round(ViewCompat.getTranslationX(child)); final int right = left + mDivider.getIntrinsicHeight(); mDivider.setBounds(left, top, right, bottom); mDivider.draw(c); } } } 适配器： package com.scout.myapplication; 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.ArrayList; /** * Created by liuguodong on 2017/8/30. */ public class RAdapter extends RecyclerView.Adapter<RAdapter.ViewHolder>{ /** * 展示数据 */ private ArrayList<String> mData; /** * 事件回调监听 */ public OnItemClickListener onItemClickListener; public RAdapter(ArrayList<String> data) { this.mData = data; } public void updateData(ArrayList<String> data) { this.mData = data; notifyDataSetChanged(); } /** * 添加新的Item */ public void addNewItem() { if(mData == null) { mData = new ArrayList<>(); } mData.add(0, "new Item"); notifyItemInserted(0); } /** * 删除Item */ public void deleteItem() { if(mData == null || mData.isEmpty()) { return; } mData.remove(0); notifyItemRemoved(0); } /** * 设置回调监听 * * @param listener */ public void setOnItemClickListener(OnItemClickListener listener) { this.onItemClickListener = listener; } @Override public ViewHolder onCreateViewHolder(ViewGroup parent, int viewType) { // 实例化展示的view View v = LayoutInflater.from(parent.getContext()).inflate(R.layout.view_rv_item, parent, false); // 实例化viewholder ViewHolder viewHolder = new ViewHolder(v); return viewHolder; } @Override public void onBindViewHolder(final ViewHolder holder, int position) { // 绑定数据 holder.mTv.setText(mData.get(position)); holder.itemView.setOnClickListener(new View.OnClickListener() { @Override public void onClick(final View v) { if(onItemClickListener != null) { int pos = holder.getLayoutPosition(); onItemClickListener.onItemClick(holder.itemView, pos); } } }); holder.itemView.setOnLongClickListener(new View.OnLongClickListener() { @Override public boolean onLongClick(View v) { if(onItemClickListener != null) { int pos = holder.getLayoutPosition(); onItemClickListener.onItemLongClick(holder.itemView, pos); } //表示此事件已经消费，不会触发单击事件 return true; } }); } @Override public int getItemCount() { return mData.size(); } public static class ViewHolder extends RecyclerView.ViewHolder { TextView mTv; public ViewHolder(View itemView) { super(itemView); mTv = (TextView) itemView.findViewById(R.id.item_tv); } } public interface OnItemClickListener { void onItemClick(View view, int position); void onItemLongClick(View view, int position); } } 适配器对应的布局 view_rv_item.xml <?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:tools="http://schemas.android.com/tools" android:orientation="vertical" android:layout_width="match_parent" android:layout_height="50dp"> <TextView android:id="@+id/item_tv" android:layout_width="match_parent" android:layout_height="match_parent" android:gravity="center" /> </LinearLayout> Main类对应的布局 activity_main.xml <?xml version="1.0" encoding="utf-8"?> <FrameLayout xmlns:android="http://schemas.android.com/apk/res/android" xmlns:app="http://schemas.android.com/apk/res-auto" xmlns:tools="http://schemas.android.com/tools" android:layout_width="match_parent" android:layout_height="match_parent" tools:context="com.scout.myapplication.MainActivity"> <android.support.v7.widget.RecyclerView android:id="@+id/recyclertest" android:layout_width="match_parent" android:layout_height="match_parent"> </android.support.v7.widget.RecyclerView> </FrameLayout> 注意：main类布局不要用最新的约束布局 有问题欢迎及时交流 源码下载地址：http://download.csdn.net/download/liu3364575/9957931