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设置ListView的item多选
一,首先定义一个类来关联Adapter和Activity能够记住点击的位置
public class MyViewHoler{ public CheckBox cb; public TextView tv; }
二,Adapter的写法
package com.example.listviewcheckdemo; import java.util.HashMap; import java.util.List; import android.annotation.SuppressLint; import android.content.Context; import android.view.LayoutInflater; import android.view.View; import android.view.ViewGroup; import android.widget.BaseAdapter; import android.widget.CheckBox; import android.widget.TextView; /** * * @author LiuZiwei * 选列表adapter * */ public class CheckAdapter extends BaseAdapter{ public static HashMap<Integer, Boolean> isSelected; private Context context = null; private List<String> list = null; @SuppressLint("UseSparseArrays") public CheckAdapter(Context context, List<String> list) { this.context = context; this.list = list; isSelected = new HashMap<Integer, Boolean>(); for (int i = 0; i < list.size(); i++) { isSelected.put(i, false); } } @Override public int getCount() { return list.size(); } @Override public Object getItem(int arg0) { return list.get(arg0); } @Override public long getItemId(int arg0) { return 0; } @Override public View getView(int position, View view, ViewGroup arg2) { MyViewHoler holder = null; if (view == null) { holder = new MyViewHoler(); view = LayoutInflater.from(context).inflate(R.layout.check_item, null); holder.tv = (TextView) view.findViewById(R.id.item_tv); holder.cb = (CheckBox) view.findViewById(R.id.item_cb); view.setTag(holder); } else { holder = (MyViewHoler) view.getTag(); } holder.tv.setText(list.get(position)); holder.cb.setChecked(isSelected.get(position)); return view; } }
三、Activity里的写法
public class MainActivity extends Activity { private ListView listview_check; private CheckAdapter adapter; /** 初始化数据*/ private List<String> newList=new ArrayList<String>(); /** 存储点击选中的数据*/ private List<String> checkList=new ArrayList<String>(); /** 全选*/ private Button btn_all; /** 反选*/ private Button btn_clear; /** 取消已选*/ private Button btn_cancel; @Override protected void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.activity_main); listview_check=(ListView) findViewById(R.id.listview); btn_all=(Button) findViewById(R.id.all); btn_clear=(Button) findViewById(R.id.clear); btn_cancel=(Button) findViewById(R.id.cancel); /** 初始化数据*/ for(int i=0;i<10;i++){ newList.add("选项"+i); } adapter=new CheckAdapter(this, newList); listview_check.setAdapter(adapter); listview_check.setOnItemClickListener(new OnItemClickListener() { @Override public void onItemClick(AdapterView<?> arg0, View view, int position, long arg3) { // TODO Auto-generated method stub MyViewHoler holder=(MyViewHoler) view.getTag(); holder.cb.toggle();// 在每次获取点击的item时改变checkbox的状态 CheckAdapter.isSelected.put(position, holder.cb.isChecked()); // 同一时候改动map的值保存状态 if (holder.cb.isChecked() == true) { checkList.add(newList.get(position)); } else { checkList.remove(newList.get(position)); } Log.e("----", "---------"+checkList.toString()); } }); /** 全选*/ btn_all.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { checkList.clear(); for(int i=0;i<newList.size();i++){ CheckAdapter.isSelected.put(i,true); checkList.add(newList.get(i)); } adapter.notifyDataSetChanged();//注意这一句必须加上,否则checkbox无法正常更新状态 } }); /** 反选*/ btn_clear.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { for(int i=0;i<newList.size();i++){ if(CheckAdapter.isSelected.get(i)==false){ CheckAdapter.isSelected.put(i, true); checkList.add(newList.get(i)); } else{ CheckAdapter.isSelected.put(i, false); checkList.remove(newList.get(i)); } } adapter.notifyDataSetChanged(); } }); /** 取消已选*/ btn_cancel.setOnClickListener(new OnClickListener() { @Override public void onClick(View arg0) { for(int i=0;i<newList.size();i++){ if(CheckAdapter.isSelected.get(i)==true){ CheckAdapter.isSelected.put(i, false); checkList.remove(newList.get(i)); } } adapter.notifyDataSetChanged(); } }); }
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