Listview实现不同类型的布局

打开各种客户端发现 Listview的布局多种多样,在我以前的认知中listview不是只能放一种item布局嘛,我就震惊了,现在我自己的项目上要用到这种方式那么就去做下

原理是listview 的adapter中有这两个方法

// 返回当前布局的样式type
    @Overridepublic int getItemViewType(int position) {return listDatas.get(position).type;}// 返回你有多少个不同的类型的数量
    @Overridepublic int getViewTypeCount() {return 3;}

过程 1 定义一个javabeen对象

package com.example.listviewdemo;import java.util.HashMap;
import java.util.Map;/*** Created by Ace on 2016/2/13.*/
public class lIstViewItem {// 用于区分listview显示的不同item,告诉适配器我这是什么类型，listview适配器根据type决定怎么显示public int type;// 将要显示的数据用HashMap包装好public HashMap<String, Object> map;public lIstViewItem(int type, HashMap<String, Object> map) {this.type = type;this.map = map;}
}

2 把数据封装在泛型是我们JAVABeen对象的的数组里

package com.example.listviewdemo;import android.app.Activity;
import android.os.Bundle;
import android.widget.ListView;import java.util.ArrayList;
import java.util.HashMap;/*** Created by Ace on 2016/2/13.*/public class MainActivity extends Activity {private ListView listView; // 页面listviewprivate ListViewAdapter listViewAdapter; // listview适配器private ArrayList<lIstViewItem> viewItemsArraylist; // Arraylist主要装载的是传给适配器的数据集合
@Overrideprotected void onCreate(Bundle savedInstanceState) {super.onCreate(savedInstanceState);setContentView(R.layout.activity_main);initData();initView();// 为listview设置适配器
//        ListViewAdapter listViewAdapter = new ListViewAdapter(MainActivity.this, getDatas());
}private void initData() {}// 初始化页面组件及一些布局private void initView() {listView = (ListView) this.findViewById(R.id.listview);listViewAdapter = new ListViewAdapter(MainActivity.this, getDatas());listView.setAdapter(listViewAdapter);}/*** 这里我们用三种不同的样式进行测试**/private ArrayList<lIstViewItem> getDatas() {viewItemsArraylist = new ArrayList<lIstViewItem>();viewItemsArraylist.add(new lIstViewItem(2, getHashMapThirdType("美人鱼", "没有买卖就没有杀害", "2016-2-13")));viewItemsArraylist.add(new lIstViewItem(1, getHashMapSecondType("单身狗", "情人节自己过")));viewItemsArraylist.add(new lIstViewItem(0, getHashMapFirstType("周杰伦")));viewItemsArraylist.add(new lIstViewItem(0, getHashMapFirstType("周星驰")));viewItemsArraylist.add(new lIstViewItem(1, getHashMapSecondType("猴子", "齐天大圣孙悟空")));return viewItemsArraylist;}// 第一种样式，只传输一个数据private HashMap<String, Object> getHashMapFirstType(String firstTheme) {HashMap<String, Object> hashMap = new HashMap<String, Object>();hashMap.put("Theme", firstTheme);return hashMap;}// 第二种样式，传输两个数据private HashMap<String, Object> getHashMapSecondType(String secondTheme, String secondContent) {HashMap<String, Object> hashMap = new HashMap<String, Object>();hashMap.put("Theme", secondTheme);hashMap.put("Content", secondContent);return hashMap;}// 第三种样式，传输三个数据private HashMap<String, Object> getHashMapThirdType(String threeTheme, String threeContent, String date) {HashMap<String, Object> hashMap = new HashMap<String, Object>();hashMap.put("Theme", threeTheme);hashMap.put("Content", threeContent);hashMap.put("Date", date);return hashMap;}}

adapter中设置我们现实的条目

package com.example.listviewdemo;import android.content.Context;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.EditText;
import android.widget.ImageView;
import android.widget.TextView;import java.util.ArrayList;/*** Created by Ace on 2016/2/13.*/
public class ListViewAdapter extends BaseAdapter {private LayoutInflater mLayoutInflater;private Context context;private ArrayList<lIstViewItem> listDatas;public ListViewAdapter(Context context, ArrayList<lIstViewItem> listDatas) {this.listDatas = listDatas;mLayoutInflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);} // 返回当前布局的样式type
    @Overridepublic int getItemViewType(int position) {return listDatas.get(position).type;}// 返回你有多少个不同的类型的数量
    @Overridepublic int getViewTypeCount() {return 3;}@Overridepublic int getCount() {return listDatas.size();}@Overridepublic Object getItem(int position) {return listDatas.get(position);}@Overridepublic long getItemId(int position) {return position;}@Overridepublic View getView(int position, View convertView, ViewGroup parent) {lIstViewItem listItem = listDatas.get(position);int Type = getItemViewType(position);//拿到当前条目的类型ViewHolderfirstType viewHolderfirstType = null;ViewHoldersecondType viewHoldersecondType = null;ViewHolderThirdType viewHolderThirdType = null;if (convertView == null) {//对类型进行判断switch (Type) {case 0:viewHolderfirstType = new ViewHolderfirstType();convertView = mLayoutInflater.inflate(R.layout.activity_first_type_item, null);viewHolderfirstType.tv_first_theme = (TextView) convertView.findViewById(R.id.tv_first_theme);viewHolderfirstType.tv_first_theme.setText(listItem.map.get("Theme").toString());convertView.setTag(viewHolderfirstType);break;case 1:viewHoldersecondType = new ViewHoldersecondType();convertView = mLayoutInflater.inflate(R.layout.activity_sencond_type_item, null);viewHoldersecondType.tv_second_content = (TextView) convertView.findViewById(R.id.tv_second_content);viewHoldersecondType.btn_second_theme = (Button) convertView.findViewById(R.id.btn_second_theme);viewHoldersecondType.tv_second_content.setText(listItem.map.get("Theme").toString());viewHoldersecondType.btn_second_theme.setText(listItem.map.get("Content").toString());convertView.setTag(viewHoldersecondType);break;case 2:viewHolderThirdType = new ViewHolderThirdType();convertView = mLayoutInflater.inflate(R.layout.activity_third_type_item, null);viewHolderThirdType.tv_three_content = (TextView) convertView.findViewById(R.id.tv_three_content);viewHolderThirdType.et_three_theme = (EditText) convertView.findViewById(R.id.et_three_theme);viewHolderThirdType.tv_three_time = (TextView) convertView.findViewById(R.id.tv_three_time);viewHolderThirdType.et_three_theme.setText(listItem.map.get("Theme").toString());viewHolderThirdType.tv_three_content.setText(listItem.map.get("Content").toString());viewHolderThirdType.tv_three_time.setText(listItem.map.get("Date").toString());convertView.setTag(viewHolderThirdType);break;}} else {switch (Type) {case 0:viewHolderfirstType = (ViewHolderfirstType) convertView.getTag();viewHolderfirstType.tv_first_theme.setText(listItem.map.get("Theme").toString());break;case 1:viewHoldersecondType = (ViewHoldersecondType) convertView.getTag();viewHoldersecondType.tv_second_content = (TextView) convertView.findViewById(R.id.tv_second_content);viewHoldersecondType.btn_second_theme = (Button) convertView.findViewById(R.id.btn_second_theme);viewHoldersecondType.tv_second_content.setText(listItem.map.get("Theme").toString());viewHoldersecondType.btn_second_theme.setText(listItem.map.get("Content").toString());break;case 2:viewHolderThirdType = (ViewHolderThirdType) convertView.getTag();viewHolderThirdType.tv_three_content = (TextView) convertView.findViewById(R.id.tv_three_content);viewHolderThirdType.et_three_theme = (EditText) convertView.findViewById(R.id.et_three_theme);viewHolderThirdType.tv_three_time = (TextView) convertView.findViewById(R.id.tv_three_time);viewHolderThirdType.et_three_theme.setText(listItem.map.get("Theme").toString());viewHolderThirdType.tv_three_content.setText(listItem.map.get("Content").toString());viewHolderThirdType.tv_three_time.setText(listItem.map.get("Date").toString());break;}}return convertView;}class ViewHolderfirstType {TextView tv_first_theme;}class ViewHoldersecondType {TextView tv_second_content;Button btn_second_theme;}class ViewHolderThirdType {EditText et_three_theme;TextView tv_three_content;TextView tv_three_time;}
}

我的genymotion又挂了...................................... 布局看viewholder就知道了..不写了

转载于:https://www.cnblogs.com/AceIsSunshineRain/p/5188388.html

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