listView多布局

首先看下效果图：  

蓝颜色线圈起来的一块为ListView。

蓝色圈里面的不同颜色分别代表不同布局，一共为4个布局。

其实我们实现起来也很简单，我先简单说下步骤：

1.在布局文件中准备你需要的布局

2.新建一个类继承与BaseAdapter，并重写里面的方法

3.根据布局的多少创建各自的ViewHolder，有3个布局就创建3个ViewHolder

4.在适配器中重写getItemViewType(int position) 和 getViewTypeCount()方法，我简单说下这两个方法getItemViewType方法里面的position是每个item的位置，我们通常来判断这个position的位置来返回具体是哪个布局，但是这里返回结果的时候有一个坑，它是从0开始的如果你直接从1开始就会造成数组越界异常，这里可能说的太笼统不太懂，不要急一步一步的给你介绍，举一个简单的例子，比如你一共有3个布局，在listView中就要在不同的位置显示这3中布局，这时候它return的顺序应该是0,1,2，如果你没有从0开始，直接返回1,2,3的话，一定是会造成数组越界的。然后getViewTypeCount这个方法就是用来返回你布局的总数的。

5.在getView中根据getItemViewType的返回值，进行判断加载不同的布局

废话不多说，直接上代码：

package com.bc.listviewlayouts;

import android.content.Context;
import android.graphics.Color;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;

/**
 * 作者：lyh on 2017/8/30 14:41
 * QQ：129929684
 * 邮箱：1299259684@qq.com
 */

public class ListViewAdapter extends BaseAdapter {

    private Context mContext;
    private final int TYPE_1 = 0;
    private final int TYPE_2 = 1;
    private final int TYPE_3 = 2;
    private final int TYPE_DEFAULT = 3;
    private final int TYPE_COUNT = 4;

    public ListViewAdapter(Context mContext) {
        this.mContext = mContext;
    }

    @Override
    public int getCount() {
        return 10;
    }

    @Override
    public Object getItem(int i) {
        return "";
    }

    @Override
    public long getItemId(int i) {
        return 0;
    }

    @Override
    public int getItemViewType(int position) {
        switch (position) {
            case 0:
                return TYPE_1;
            case 1:
            case 3:
            case 5:
                return TYPE_2;
            case 2:
            case 4:
            case 8:
            case 9:
                return TYPE_3;
            default:
                return TYPE_DEFAULT;
        }
    }

    /**
     *
     * @return 一共有几个布局就返回几
     */
    @Override
    public int getViewTypeCount() {
        return TYPE_COUNT;
    }

    @Override
    public View getView(int i, View view, ViewGroup viewGroup) {
        ViewHolderOne viewHolderOne = null;
        ViewHolderTwo viewHolderTwo = null;
        ViewHolderThree viewHolderThree = null;
        ViewHolderDefault viewHolderDefault = null;
        int type = getItemViewType(i);
        if (view == null) {
            LayoutInflater inflater = LayoutInflater.from(mContext);
            switch (type) {
                case TYPE_1:
                    viewHolderOne = new ViewHolderOne();
                    view = inflater.inflate(R.layout.listview_main_item01, viewGroup, false);
                    viewHolderOne.tv_listView_item01 = view.findViewById(R.id.tv_listView_item01);
                    viewHolderOne.iv_listView_item01 = view.findViewById(R.id.iv_listView_item01);
                    view.setTag(viewHolderOne);
                    break;
                case TYPE_2:
                    viewHolderTwo = new ViewHolderTwo();
                    view = inflater.inflate(R.layout.listview_main_item02, viewGroup, false);
                    viewHolderTwo.tv_listView_item02 = view.findViewById(R.id.tv_listView_item02);
                    viewHolderTwo.tv2_listView_item02 = view.findViewById(R.id.tv2_listView_item02);
                    view.setTag(viewHolderTwo);
                    break;
                case TYPE_3:
                    viewHolderThree = new ViewHolderThree();
                    view = inflater.inflate(R.layout.listview_main_item03, viewGroup, false);
                    viewHolderThree.tv_listView_item03 = view.findViewById(R.id.tv_listView_item03);
                    viewHolderThree.iv_listView_item03 = view.findViewById(R.id.iv_listView_item03);
                    viewHolderThree.iv2_listView_item03 = view.findViewById(R.id.iv2_listView_item03);
                    view.setTag(viewHolderThree);
                    break;
                default:
                    viewHolderDefault = new ViewHolderDefault();
                    view = inflater.inflate(R.layout.listview_main_item_default, viewGroup, false);
                    viewHolderDefault.tv_listView_item_default = view.findViewById(R.id.tv_listView_item_default);
                    view.setTag(viewHolderDefault);
            }
        } else {
            switch (type) {
                case TYPE_1:
                    viewHolderOne = (ViewHolderOne) view.getTag();
                    break;
                case TYPE_2:
                    viewHolderTwo = (ViewHolderTwo) view.getTag();
                    break;
                case TYPE_3:
                    viewHolderThree = (ViewHolderThree) view.getTag();
                    break;
                default:
                    viewHolderDefault = (ViewHolderDefault) view.getTag();
            }
        }
        switch (type) {
            case TYPE_1:
                viewHolderOne.tv_listView_item01.setText("我是第一种布局");
                viewHolderOne.tv_listView_item01.setTextColor(Color.RED);
                break;
            case TYPE_2:
                viewHolderTwo.tv_listView_item02.setText("我是第二种布局的头部");
                viewHolderTwo.tv_listView_item02.setTextColor(Color.GREEN);
                viewHolderTwo.tv2_listView_item02.setText("我是第二种布局的尾部");
                viewHolderTwo.tv2_listView_item02.setTextColor(Color.GREEN);
                break;
            case TYPE_3:
                viewHolderThree.tv_listView_item03.setText("我是第三种布局");
                viewHolderThree.tv_listView_item03.setTextColor(Color.BLUE);
                break;
            default:
                viewHolderDefault.tv_listView_item_default.setText("我是默认布局，默认样式");
        }
        return view;
    }
}