Android RecyclerView实现九宫格效果

RecyclerView更加优化的复用机制和方便实现UI效果，几乎替代Listview和GridView的使用。但是分割线的实现，需要自己继承ItemDecoration来绘制。

完整代码已上传至Github：RecyclerView实现九宫格效果

效果图

item的布局文件

<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"android:orientation="vertical"android:gravity="center"android:layout_width="match_parent"android:layout_height="wrap_content"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="horizontal"android:gravity="center_vertical"android:layout_marginTop="25dp"android:layout_marginLeft="15dp"android:layout_marginRight="15dp"><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:layout_weight="1"android:text="餐饮"android:id="@+id/txt_title"android:textSize="16sp"android:textStyle="bold"android:textColor="#555555"/><ImageViewandroid:layout_width="36dp"android:layout_height="36dp"android:id="@+id/img_title"android:src="@mipmap/luggage_blue"/></LinearLayout><LinearLayoutandroid:layout_width="match_parent"android:layout_height="20dp"android:orientation="vertical"android:layout_marginBottom="25dp"android:layout_marginLeft="15dp"android:layout_marginRight="15dp"><TextViewandroid:layout_width="match_parent"android:layout_height="match_parent"android:text="提供航空 餐饮美食"android:id="@+id/txt_info"android:textSize="14sp"android:textColor="#999999"/></LinearLayout></LinearLayout>

activity_main.xml布局文件

<?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="match_parent"android:background="#f1f1f1"tools:context=".MainActivity"><TextViewandroid:layout_width="match_parent"android:layout_height="50dp"android:textColor="#ffffff"android:textSize="18sp"android:gravity="center"android:text="RecyclerView实现九宫格"android:background="#30B8E3"/><ScrollViewandroid:layout_width="match_parent"android:layout_height="match_parent"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="wrap_content"android:orientation="vertical"><LinearLayoutandroid:layout_width="match_parent"android:layout_height="50dp"android:gravity="center_vertical"android:layout_marginLeft="15dp"android:layout_marginRight="15dp"android:orientation="horizontal"><ImageViewandroid:layout_width="20dp"android:layout_height="20dp"android:src="@mipmap/air_gray"android:layout_marginRight="8dp"/><TextViewandroid:layout_width="match_parent"android:layout_height="wrap_content"android:text="航行助手"android:textStyle="bold"android:textSize="18sp"/></LinearLayout><android.support.v7.widget.RecyclerViewandroid:id="@+id/main_recycleview"android:divider="#00000000"android:layout_width="match_parent"android:layout_height="wrap_content"android:background="@drawable/shape_bg"android:layout_marginLeft="15dp"android:layout_marginRight="15dp"android:layout_marginBottom="15dp"></android.support.v7.widget.RecyclerView></LinearLayout></ScrollView></LinearLayout>

MainActivity.java代码

package com.davis.recyclerviewdemo;import android.os.Bundle;
import android.support.v7.app.AppCompatActivity;
import android.support.v7.widget.GridLayoutManager;
import android.support.v7.widget.RecyclerView;import com.davis.recyclerviewdemo.adapter.CommonDecoration;
import com.davis.recyclerviewdemo.adapter.RecyclerViewAdapter;
import com.davis.recyclerviewdemo.bean.MenuBean;import java.util.ArrayList;
import java.util.List;public class MainActivity extends AppCompatActivity {private RecyclerView recyclerView;private RecyclerViewAdapter adapter;private List<MenuBean> listDatas = new ArrayList<MenuBean>();@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);init();}private void init(){recyclerView = (RecyclerView)findViewById(R.id.main_recycleview);loadMenuData();recyclerView.setLayoutManager(new GridLayoutManager(this, 2));recyclerView.addItemDecoration(new CommonDecoration(this));adapter = new RecyclerViewAdapter(this, listDatas);recyclerView.setAdapter(adapter);}private void loadMenuData(){listDatas.add(new MenuBean("安检", "快速安检", R.mipmap.check_blue));listDatas.add(new MenuBean("行李", "提醒行李动态", R.mipmap.luggage_blue));listDatas.add(new MenuBean("餐饮", "提供航空 餐饮美食", R.mipmap.food_blue));listDatas.add(new MenuBean("VIP休息", "机场休息室", R.mipmap.vip_blue));listDatas.add(new MenuBean("机舱服务", "机舱上网 游戏娱乐", R.mipmap.service_blue));listDatas.add(new MenuBean("更多", "更多信息", R.mipmap.more_blue));}
}

其中GridLayoutManager用来设置显示列数，CommonDecoration用来绘制分隔线。

CommonDecoration.java代码

package com.davis.recyclerviewdemo.adapter;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.GridLayoutManager;
import android.support.v7.widget.RecyclerView;
import android.support.v7.widget.StaggeredGridLayoutManager;
import android.view.View;/*** Created by Administrator on 2019/4/14.*/public class CommonDecoration extends RecyclerView.ItemDecoration {private static final int[] ATTRS = new int[]{android.R.attr.listDivider};private Drawable mDivider;public CommonDecoration(Context context) {final TypedArray a = context.obtainStyledAttributes(ATTRS);mDivider = a.getDrawable(0);a.recycle();}@Overridepublic void onDraw(Canvas c, RecyclerView parent, RecyclerView.State state) {drawHorizontal(c, parent);drawVertical(c, parent);}private int getSpanCount(RecyclerView parent) {// 列数int spanCount = -1;RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {spanCount = ((GridLayoutManager) layoutManager).getSpanCount();} else if (layoutManager instanceof StaggeredGridLayoutManager) {spanCount = ((StaggeredGridLayoutManager) layoutManager).getSpanCount();}return spanCount;}public void drawHorizontal(Canvas c, RecyclerView parent) {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.getLeft() - params.leftMargin;final int right = child.getRight() + params.rightMargin+ mDivider.getIntrinsicWidth();final int top = child.getBottom() + params.bottomMargin;final int bottom = top + mDivider.getIntrinsicHeight();mDivider.setBounds(left, top, right, bottom);mDivider.draw(c);}}public void drawVertical(Canvas c, RecyclerView parent) {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.getTop() - params.topMargin;final int bottom = child.getBottom() + params.bottomMargin;final int left = child.getRight() + params.rightMargin;final int right = left + mDivider.getIntrinsicWidth();mDivider.setBounds(left, top, right, bottom);mDivider.draw(c);}}private boolean isLastColum(RecyclerView parent, int pos, int spanCount,int childCount) {RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {// 如果是最后一列，则不需要绘制右边if ((pos + 1) % spanCount == 0) {return true;}} else if (layoutManager instanceof StaggeredGridLayoutManager) {int orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();if (orientation == StaggeredGridLayoutManager.VERTICAL) {// 如果是最后一列，则不需要绘制右边if ((pos + 1) % spanCount == 0) {return true;}} else {childCount = childCount - childCount % spanCount;if (pos >= childCount) {// 如果是最后一列，则不需要绘制右边return true;}}}return false;}private boolean isLastRaw(RecyclerView parent, int pos, int spanCount, int childCount) {RecyclerView.LayoutManager layoutManager = parent.getLayoutManager();if (layoutManager instanceof GridLayoutManager) {int last = childCount % spanCount;if (last == 0) {last = spanCount;}childCount = childCount - last;if (pos >= childCount) {// 如果是最后一行，则不需要绘制底部return true;}} else if (layoutManager instanceof StaggeredGridLayoutManager) {int orientation = ((StaggeredGridLayoutManager) layoutManager).getOrientation();// StaggeredGridLayoutManager 且纵向滚动if (orientation == StaggeredGridLayoutManager.VERTICAL) {int last = childCount % spanCount;if (last == 0) {last = spanCount;}childCount = childCount - last;// 如果是最后一行，则不需要绘制底部if (pos >= childCount) {return true;}} else {// StaggeredGridLayoutManager 且横向滚动// 如果是最后一行，则不需要绘制底部if ((pos + 1) % spanCount == 0) {return true;}}}return false;}@Overridepublic void getItemOffsets(Rect outRect, int itemPosition,RecyclerView parent) {int spanCount = getSpanCount(parent);int childCount = parent.getAdapter().getItemCount();if (isLastColum(parent, itemPosition, spanCount, childCount)) {// 如果是最后一列，则不需要绘制右边if (itemPosition == (childCount - 1)) {outRect.set(0, 0, 0, 0);} else {outRect.set(0, 0, 0, mDivider.getIntrinsicHeight());}} else if (isLastRaw(parent, itemPosition, spanCount, childCount)) {// 如果是最后一行，则不需要绘制底部outRect.set(0, 0, mDivider.getIntrinsicWidth(), 0);} else {outRect.set(0, 0, mDivider.getIntrinsicWidth(),mDivider.getIntrinsicHeight());}}
}

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Android RecyclerView实现九宫格效果

效果图

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