Listview实现不同类型的布局

时间：2021-07-17 18:05:20

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
 @Override public int getItemViewType(int position) { return listDatas.get(position).type; } // 返回你有多少个不同的类型的数量
 @Override public 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listview
    private 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
 @Override protected 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
 @Override public int getItemViewType(int position) { return listDatas.get(position).type; } // 返回你有多少个不同的类型的数量
 @Override public int getViewTypeCount() { return 3; } @Override public int getCount() { return listDatas.size(); } @Override public Object getItem(int position) { return listDatas.get(position); } @Override public long getItemId(int position) { return position; } @Override public 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

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