android中多个CheckBox（已超过整个屏幕）全选和反选问题
android中ListView下多个CheckBox全选问题，如果CheckBox的个数超过一屏，则会出现部分被选中，部分未被选中的问题，请问高手如何解决？
[解决办法]
这是不就是记录一个状态么？肯定是状态没置上的原因。
[解决办法]
在一个group里面也会出这个问题？
[解决办法]
还没有遇到全屏CheckBox的 完了试试看
[解决办法]
把你的全选反选的代码贴上来看看吧
主要是看Adapter里怎么处理
最笨的办法：用ListView实例的方法去找到子的checkbox实例，然后挨个置上，应该没问题的
[解决办法]
需要自定义ListView的MyAdapter
/*
* 自定义ListView的MyAdapter
*/
public final class ViewHolder {
public TextView iid;
public EditText info;
public CheckBox cbx;
public ImageView img;
}
Set<Object> selectedSet = new HashSet<Object>(); //重点
public class MyAdapter extends BaseAdapter {
private LayoutInflater mInflater;
public MyAdapter(Context context) {
this.mInflater = LayoutInflater.from(context);
}
@Override
public int getCount() {
return mData.size();
}
@Override
public Object getItem(int position) {
return mData.get(position);
}
@Override
public long getItemId(int arg0) {
return arg0;
}
@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
ViewHolder holder = null;
if (convertView == null) {
holder = new ViewHolder();
convertView = mInflater.inflate(R.layout.marklist, null);
holder.iid = (TextView) convertView.findViewById(R.id.iid);
holder.info = (EditText) convertView.findViewById(R.id.info);
holder.cbx = (CheckBox) convertView.findViewById(R.id.cbx);
holder.img = (ImageView) convertView.findViewById(R.id.img);
convertView.setTag(holder);
} else {
holder = (ViewHolder) convertView.getTag();
}
holder.iid.setText(String.valueOf(mData.get(position).get("iid")));
holder.info.setText((String) mData.get(position).get("info"));
int resid = (Integer) mData.get(position).get("img");
if (resid != 0)
holder.img.setBackgroundResource(resid);
holder.info.setText(mData.get(position).toString());
//重点开始
Object b = (Object) getItem(position);
if (b != null) {
if (selectedSet.contains(b)) {
holder.cbx.setChecked(true);
} else {
holder.cbx.setChecked(false);
}
}
holder.cbx.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View v) {
CheckBox cb = (CheckBox) v;
if (cb.isChecked()) {
selectedSet.add((Object) getItem(position));
} else {
selectedSet.remove((Object) getItem(position));
}
}
});
//重点结束
holder.info.setOnClickListener(new View.OnClickListener() {
@Override
public void onClick(View arg0) {
}
});
return convertView;
}
@Override
public void notifyDataSetChanged() {
// TODO Auto-generated method stub
super.notifyDataSetChanged();
}
}
package com.listViewTest;
import java.util.ArrayList;
import java.util.List;
import android.app.ListActivity;
import android.content.Context;
import android.os.Bundle;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CheckBox;
import android.widget.LinearLayout;
import android.widget.ListView;
import android.widget.TextView;
public class ListViewTest extends ListActivity {
/** Called when the activity is first created. */
Context context = null;
List<Integer> list = new ArrayList<Integer>();
CheckBox checkbox;
private LinearLayout lr;
@Override
public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.main);
context = getApplicationContext();
setListAdapter(new MyListAdapter());
}
@Override
protected void onListItemClick(ListView l, View v, int position, long id) {
// TODO Auto-generated method stub
super.onListItemClick(l, v, position, id);
lr = (LinearLayout) v;
checkbox = (CheckBox) lr.getChildAt(1);
if (list.contains(new Integer(position))) {
checkbox.setChecked(false);
list.remove(new Integer(position));
}else {
checkbox.setChecked(true);
list.add(new Integer(position));
}
}
class MyListAdapter extends BaseAdapter{
String data[] = new String[]{"apple", "pear", "banana", "orange","apple", "pear", "banana", "orange","apple", "pear", "banana", "orange"};
public int getCount() {
// TODO Auto-generated method stub
return data.length;
}
public Object getItem(int position) {
// TODO Auto-generated method stub
return data[position];
}
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}
public View getView(int position, View convertView, ViewGroup parent) {
if (null == convertView){
LayoutInflater inflater = (LayoutInflater) context.getSystemService(Context.LAYOUT_INFLATER_SERVICE);
convertView = inflater.inflate(R.layout.list_item, parent, false);
}
TextView text = (TextView)convertView.findViewById(R.id.info);
checkbox = (CheckBox)convertView.findViewById(R.id.checkstatus);
checkbox.setTag(new Integer(position));
text.setText(data[position]);
if (list != null) {
checkbox.setChecked((list.contains(new Integer(position))));
} else {
checkbox.setChecked(false);
}
return convertView;
}
}
}
