listview中添加CheckBox的完美实现
目前大多数listview中添加checkbox，都是实现点击listview的某一子项来实现子项中checkbox的选中与否。
本文实现的功能是将listview子项中的checkbox与listview分离出来，即点击listview的子项实现的是查看listview子项的内容，点击子项中的checkbox来实现checkbox的选中与否
本文没有实现listview的分页滚屏效果
以下是activity的代码：下面还有xml文件
package com.test;
import java.util.ArrayList;
import java.util.HashMap;
import android.app.Activity;
import android.app.AlertDialog;
import android.app.AlertDialog.Builder;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.AdapterView;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.AdapterView.OnItemClickListener;
public class ListView_CheckBoxActivity extends Activity {
int scroll_num = 10;
ViewHolder holder;
HashMap<Integer,Boolean> isSelected;
MyAdapter adapter;
ArrayList<HashMap> data;
HashMap map;
ListView mListView;
Button btn_all;
Button btn_none;
/** Called when the activity is first created. */
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
mListView = (ListView)findViewById(R.id.main_listview);
btn_all = (Button)findViewById(R.id.main_all);
btn_none = (Button)findViewById(R.id.main_none);
//初始化数据
init_data();
//设置按钮点击事件
init_btn();
//设置listview
init_listview();
}
//初始化数据
public void init_data(){
data = new ArrayList<HashMap>();
for(int i = 0; i<20; i++){
map = new HashMap();
map.put("title", "title-->"+i);
map.put("content", "content-------------------------------->"+i);
data.add(map);
}
}
//设置按钮点击事件
public void init_btn(){
btn_all.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
// TODO Auto-generated method stub
for(int i = 0; i<data.size(); i++){
isSelected.put(i, true);
adapter.notifyDataSetChanged();
}
}
});
btn_none.setOnClickListener(new OnClickListener() {
public void onClick(View v) {
for(int i = 0; i<data.size(); i++){
isSelected.put(i, false);
adapter.notifyDataSetChanged();
}
}
});
}
//设置listview
public void init_listview(){
adapter = new MyAdapter(ListView_CheckBoxActivity.this, data);
mListView.setAdapter(adapter);
//为listview的子项添加点击事件，点击后查看短信内容
mListView.setOnItemClickListener(new OnItemClickListener() {
@Override
public void onItemClick(AdapterView<?> parent, View view,
int position, long id) {
holder = (ViewHolder) view.getTag();
AlertDialog.Builder builder = new Builder(ListView_CheckBoxActivity.this);
builder.setTitle(holder.title.getText().toString()+":")
.setMessage(holder.content.getText().toString());
AlertDialog dialog = builder.create();
dialog.setCanceledOnTouchOutside(true);
dialog.show();
}
});
}
class MyAdapter extends BaseAdapter{
int count = scroll_num;
Context mContext;
ArrayList<HashMap> mData;
LayoutInflater mInflater;
public MyAdapter(Context context,ArrayList<HashMap> data) {
this.mContext = context;
this.mData = data;
mInflater = (LayoutInflater) mContext.getSystemService(mContext.LAYOUT_INFLATER_SERVICE);
if(count>mData.size()){
count = mData.size();
}
System.out.println("1111111111");
isSelected = new HashMap<Integer,Boolean>();
for(int i = 0; i<data.size(); i++){
isSelected.put(i, false);
}
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int position) {
return position;
}
@Override
public long getItemId(int position) {
return position;
}
@Override
public View getView(final int position, View convertView, ViewGroup parent) {
if(convertView == null){
convertView = mInflater.inflate(R.layout.item_listview, null);
holder = new ViewHolder();
holder.title = (TextView) convertView.findViewById(R.id.item_listview_title);
holder.content = (TextView) convertView.findViewById(R.id.item_listview_content);
holder.checkBox = (CheckBox) convertView.findViewById(R.id.item_listview_checkbox);
convertView.setTag(holder);
}else{
holder = (ViewHolder) convertView.getTag();
}
holder.title.setText(data.get(position).get("title").toString());
holder.content.setText(data.get(position).get("content").toString());
holder.checkBox.setChecked(isSelected.get(position));
holder.checkBox.setOnClickListener(new OnClickListener() {
@Override
public void onClick(View v) {
if(isSelected.get(position)){
isSelected.put(position, false);
}else{
isSelected.put(position, true);
}
notifyDataSetChanged();
}
});
return convertView;
}
}
class ViewHolder{
TextView title;
TextView content;
CheckBox checkBox;
}
}
以下是main.xml文件的内容
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<ListView
android:id="@+id/main_listview"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.1"
></ListView>
<LinearLayout android:layout_height="fill_parent"
android:layout_width="fill_parent"
android:layout_weight="0.9"
android:orientation="horizontal">
<Button android:id="@+id/main_all"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.5"
android:text="全选选中"/>
<Button android:id="@+id/main_none"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.5"
android:text="全选取消"/>
</LinearLayout>
</LinearLayout>
以下是listview子项item_listview.xml的内容
<?xml version="1.0" encoding="utf-8"?>
<LinearLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:orientation="vertical"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
>
<LinearLayout android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.7">
<TextView android:id="@+id/item_listview_title"
android:layout_width="fill_parent"
android:layout_height="fill_parent"/>
</LinearLayout>
<RelativeLayout android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:layout_weight="0.3">
<CheckBox android:id="@+id/item_listview_checkbox"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentRight="true"
android:layout_centerVertical="true"
android:focusable="false"
/>
<TextView
android:id="@+id/item_listview_content"
android:layout_width="wrap_content"
android:layout_height="fill_parent"
android:layout_alignParentLeft="true"
android:layout_toLeftOf="@+id/item_listview_checkbox"
android:layout_centerVertical="true"
android:textSize="36dip"
android:singleLine="true"
android:ellipsize="marquee"
android:marqueeRepeatLimit="marquee_forever"
/>
</RelativeLayout>
</LinearLayout>
