GridView

仿照上一个ListView，写了GridView，基本内容差不多，抛代码：

MainActivity ：

package com.fitsoft;

import android.support.v7.app.AppCompatActivity;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.GridView;
import android.widget.ImageView;
import android.widget.TextView;

import java.util.ArrayList;
import java.util.List;

public class MainActivity extends AppCompatActivity {

    List<MenuItem> list;

    @Override
    protected void onCreate(Bundle savedInstanceState) {
        super.onCreate(savedInstanceState);
        setContentView(R.layout.activity_main);

        GridView gridView = findViewById(R.id.grid_view);

        list = new ArrayList<>();

        for(int i=0; i<50; i++){
            MenuItem menuItem = new MenuItem("菜单"+i,i%2==0?R.mipmap.ic_launcher_round:R.mipmap.ic_launcher);
            list.add(menuItem);
        }

        MenuAdapter menuAdapter = new MenuAdapter();

        gridView.setAdapter(menuAdapter);


    }

    class MenuAdapter extends BaseAdapter{
        @Override
        public int getCount() {
            return list.size();
        }

        @Override
        public Object getItem(int position) {
            return list.get(position);
        }

        @Override
        public long getItemId(int position) {
            return position;
        }

        @Override
        public View getView(int position, View convertView, ViewGroup parent) {

            View menuView = convertView;

            if(menuView == null){
                menuView = LayoutInflater.from(getApplicationContext()).inflate(R.layout.grid_item, parent, false);
            }

            TextView textView = menuView.findViewById(R.id.tv_menu);
            textView.setText(list.get(position).menuName);

            ImageView imageView = menuView.findViewById(R.id.tv_image);
            imageView.setBackgroundResource(list.get(position).menuDrawableId);

            return menuView;
        }
    }

    class MenuItem{
        String menuName;
        int menuDrawableId;

        MenuItem(String menuName, int menuDrawableId){
            this.menuName = menuName;
            this.menuDrawableId = menuDrawableId;
        }
    }

}

activity_main.xml ：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout 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=".MainActivity">

    <GridView
        android:id="@+id/grid_view"
        android:layout_width="match_parent"
        android:layout_height="match_parent"
        android:numColumns="3"
        android:overScrollMode="never"
        android:verticalSpacing="20dp"
        android:layout_marginStart="8dp"
        android:layout_marginLeft="8dp"
        android:layout_marginTop="8dp"
        android:layout_marginEnd="8dp"
        android:layout_marginRight="8dp"
        android:layout_marginBottom="8dp"
        app:layout_constraintBottom_toBottomOf="parent"
        app:layout_constraintEnd_toEndOf="parent"
        app:layout_constraintStart_toStartOf="parent"
        app:layout_constraintTop_toTopOf="parent"/>

</android.support.constraint.ConstraintLayout>

其中，numColumns是设置多少列，verticalSpacing指上下两行的间距

grid_item.xml ：

<?xml version="1.0" encoding="utf-8"?>
<android.support.constraint.ConstraintLayout
    xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="match_parent"
    android:layout_height="match_parent">

    <LinearLayout
        android:orientation="vertical"
        android:gravity="center"
        android:layout_width="match_parent"
        android:layout_height="match_parent">

        <ImageView
            android:id="@+id/tv_image"
            android:layout_width="50dp"
            android:layout_height="50dp"/>

        <TextView
            android:id="@+id/tv_menu"
            android:layout_width="wrap_content"
            android:layout_height="wrap_content"
            android:textColor="#000"/>

    </LinearLayout>

</android.support.constraint.ConstraintLayout>

这里为LinearLayout的gravity设置居中显示（图片和文字）

效果图：