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

Android RecyclerView实现九宫格效果_第1张图片
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">    <LinearLayout        android: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">        <TextView            android: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"/>        <ImageView            android:layout_width="36dp"            android:layout_height="36dp"            android:id="@+id/img_title"            android:src="@mipmap/luggage_blue"/>    LinearLayout>    <LinearLayout        android:layout_width="match_parent"        android:layout_height="20dp"        android:orientation="vertical"        android:layout_marginBottom="25dp"        android:layout_marginLeft="15dp"        android:layout_marginRight="15dp">        <TextView            android: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">    <TextView        android: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"/>    <ScrollView        android:layout_width="match_parent"        android:layout_height="match_parent">        <LinearLayout            android:layout_width="match_parent"            android:layout_height="wrap_content"            android:orientation="vertical">            <LinearLayout                android:layout_width="match_parent"                android:layout_height="50dp"                android:gravity="center_vertical"                android:layout_marginLeft="15dp"                android:layout_marginRight="15dp"                android:orientation="horizontal">                <ImageView                    android:layout_width="20dp"                    android:layout_height="20dp"                    android:src="@mipmap/air_gray"                    android:layout_marginRight="8dp"/>                <TextView                    android: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.RecyclerView                android: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>();    @Override    protected 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();    }    @Override    public 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;    }    @Override    public 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());        }    }}

效果图

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