ChecBox全选

package com.example.allandreverse;


import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;






import android.os.Bundle;
import android.app.Activity;
import android.content.Context;
import android.view.Menu;
import android.view.View;
import android.view.ViewGroup;
import android.view.View.OnClickListener;
import android.widget.BaseAdapter;
import android.widget.Button;
import android.widget.CheckBox;
import android.widget.ListView;
import android.widget.TextView;
import android.widget.Toast;


public class MainActivity extends Activity {


private ListView list_view;
private CheckAdapter checkAdapter;
private CheckBox allBox;
private Button reverse;


@Override
protected void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.activity_main);

list_view = (ListView)findViewById(R.id.list_view);
allBox = (CheckBox)findViewById(R.id.all);
reverse = (Button)findViewById(R.id.reverse);

List list = new ArrayList();
for (int i = 0; i < 15; i++) {
list.add("这是条目" + i);
}

checkAdapter = new CheckAdapter(getApplicationContext(), list);
list_view.setAdapter(checkAdapter);

//设置全选
allBox.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
boolean flag = allBox.isChecked();

for (int i = 0; i < checkAdapter.getSelect().size(); i++) {
checkAdapter.getSelect().set(i, flag);
}
checkAdapter.notifyDataSetChanged();

}
});

//反选
reverse.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
if (! checkAdapter.getSelect().contains(true)) {
Toast.makeText(MainActivity.this, "qingxuanz", 0).show();
}else {
for (int i = 0; i < checkAdapter.getSelect().size(); i++) {
if (checkAdapter.getSelect().get(i)) {
checkAdapter.getSelect().set(i, false);
}else {
checkAdapter.getSelect().set(i, true);
}
}

if (checkAdapter.getSelect().contains(false)) {
allBox.setChecked(false);
}

checkAdapter.notifyDataSetChanged();
}
}
});

}


private class CheckAdapter extends BaseAdapter {
private List list;
private Context context;

//创建一个集合 去记录选中与未选中的状态 
LinkedList linkedList = new LinkedList();


public CheckAdapter(Context context, List list) {
// TODO Auto-generated constructor stub
this.list = list;
this.context = context;

for (int i = 0; i < list.size(); i++) {
linkedList.add(false);
}

}
//对外提供一个方法 获取这个集合
private List getSelect() {
return linkedList;
}



@Override
public int getCount() {
// TODO Auto-generated method stub
return list.size();
}


@Override
public Object getItem(int position) {
// TODO Auto-generated method stub
return list.get(position);
}


@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return position;
}


@Override
public View getView(final int position, View convertView,
ViewGroup parent) {
if (convertView == null) {
convertView = View.inflate(context, R.layout.item, null);
}
CheckBox ck = (CheckBox) convertView.findViewById(R.id.ck);
TextView tView = (TextView) convertView.findViewById(R.id.tv);


tView.setText(list.get(position));


ck.setChecked(linkedList.get(position));
//对checkBox点击进行监听
ck.setOnClickListener(new OnClickListener() {

@Override
public void onClick(View v) {
//点中的时候改成相反的值
linkedList.set(position, ! linkedList.get(position));

//点击的同时还要去判断全选
if (linkedList.contains(false)) {
allBox.setChecked(false);
}else {
allBox.setChecked(true);
}

notifyDataSetChanged();
}
});

return convertView;
}


}


}