listView多布局

时光总嘲笑我的痴心妄想 提交于 2020-03-01 21:20:17

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;    }}
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