ListView滚动翻页,Radiobutton实现单选

EditAdapter.java页面

import java.util.HashMap;
import java.util.List;

import android.app.Activity;
import android.content.Context;
import android.graphics.Bitmap;
import android.view.LayoutInflater;
import android.view.View;
import android.view.ViewGroup;
import android.widget.BaseAdapter;
import android.widget.CompoundButton;
import android.widget.ImageView;
import android.widget.RadioButton;
import android.widget.TextView;
import android.widget.Toast;
import android.widget.CompoundButton.OnCheckedChangeListener;

public class EditAdapter extends BaseAdapter {
// 定义一个LayoutInflater来导入资源文件用
LayoutInflater inflater;
// 用来接收要绑定的数据
List<HashMap<String, Object>> aList;
// 要绑定的资源文件id
int resID;
private int temp = -1;
Activity activity;
HashMap<String,Boolean> states=new HashMap<String,Boolean>();

public EditAdapter(Context context, List<HashMap<String, Object>> aList,
int resId) {
this.inflater = LayoutInflater.from(context);
this.aList = aList;
this.resID = resId;
activity= (Activity)context;
}

// 绑定的数据的长度，也就是ListView项的个数
@Override
public int getCount() {
// TODO Auto-generated method stub
return this.aList.size();
}

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

@Override
public long getItemId(int position) {
// TODO Auto-generated method stub
return 0;
}

@Override
public View getView(final int position, View convertView, ViewGroup parent) {

Eholder holder;
if (convertView == null) {
convertView = inflater.inflate(R.layout.editpersonitem, null);
holder = new Eholder();

// setTag方法用来设置与视图关联的标签，我的理解就是把和它相关的ViewHolder存储起来，到用的时候再拿出来
convertView.setTag(holder);
} else {
// 如果不为null就直接通过getTag取出来
holder = (Eholder) convertView.getTag();
}
holder.itemview = (ImageView) convertView.findViewById(R.id.imgperson);
final RadioButton radio=(RadioButton) convertView.findViewById(R.id.rdoperdson);
holder.radiobutton = radio;
// 人物照片
// 图片网络路径
String imageUrl = this.aList.get(position).get("PhotoUrl").toString();
// 图片本地路径
String imageName = this.aList.get(position).get("PhotoName").toString();

// 缩略图在本地的路径
Bitmap imageBitmap = Utility.getLoacalBitmap(imageName);
// 如果本地有保存
if (imageBitmap != null) {
holder.itemview.setImageBitmap(imageBitmap);

} else {// 如果本地没有保存

imageBitmap = Utility.getNetBitmap(imageUrl);
if (imageBitmap != null) {

Utility.SaveImage(imageBitmap, imageName);

holder.itemview.setImageBitmap(imageBitmap);

}

}

// RadioButton
holder.radiobutton.setOnClickListener(new View.OnClickListener() {

public void onClick(View v) {
// TODO Auto-generated method stub

Toast.makeText(activity.getApplicationContext(), "选中的是第"+position+"条记录", 0).show();

//重置，确保最多只有一项被选中
for(String key:states.keySet()){
states.put(key, false);

}
states.put(String.valueOf(position), radio.isChecked());
EditAdapter.this.notifyDataSetChanged();
}
});

boolean res=false;
if(states.get(String.valueOf(position)) == null || states.get(String.valueOf(position))== false){
res=false;
states.put(String.valueOf(position), false);
}
else
res=true;

holder.radiobutton.setChecked(res);
return convertView;

}

/**
* 添加数据列表项
*
* @param newsitem
*/
public void addNewsItem(List<HashMap<String, Object>> newItem) {
for (int i = 0; i < newItem.size(); i++) {
aList.add(newItem.get(i));
}
}}

EditPerson.java页面

import java.io.File;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;

import org.json.JSONArray;
import org.json.JSONObject;

import android.app.Activity;
import android.app.AlertDialog;
import android.app.ProgressDialog;
import android.content.DialogInterface;
import android.content.Intent;
import android.graphics.Bitmap;
import android.os.Bundle;
import android.os.Environment;
import android.os.Handler;
import android.view.View;
import android.widget.AbsListView;
import android.widget.AdapterView;
import android.widget.Button;
import android.widget.ListView;
import android.widget.ProgressBar;
import android.widget.RadioButton;
import android.widget.Toast;
import android.widget.AbsListView.OnScrollListener;
import android.widget.AdapterView.OnItemClickListener;

public class EditPerson extends Activity implements OnScrollListener {

private EditAdapter adapter = null;
private int visibleLastIndex = 0; // 最后的可视项索引
private int visibleItemCount; // 当前窗口可见项总数
private int datasize = 0; // 数据集的条数
private Boolean isOver = false;
private Handler handler = new Handler();
private ListView lv;
private ArrayList<String> imageNames = new ArrayList<String>();
private String useridstring;
private String imagePath = Environment.getExternalStorageDirectory()
+ "/DCIM/Camera/";
private String photoDate;
//private ProgressDialog progressDialog = null;

List<HashMap<String, Object>> aList = null;
private ProgressBar circleProgressBar;
//弹出窗口
AlertDialog.Builder dialog = null;
//每滚动一页显示多少条数据
private String pageSize = "5";
//第几页
private int pageIndex = 1;

public void onCreate(Bundle savedInstanceState) {
super.onCreate(savedInstanceState);
setContentView(R.layout.editperson);

//"上一步"按钮
Button btnBack = (Button) findViewById(R.id.btnBack);
//"新增"按钮
Button btnAdd = (Button) findViewById(R.id.btnAdd);
//"覆盖"按钮
Button btnRe = (Button) findViewById(R.id.btnRe);

//点"上一步"按钮跳转到之前有搜索数据的搜索页面，不重新加载,并销毁此页
btnBack.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {

finish();
}
});

dialog = new AlertDialog.Builder(this);

// 获得前面的activity传来的参数
Bundle bundle = new Bundle();
bundle = this.getIntent().getExtras();
// userid的字符串
useridstring = bundle.getString("Userid");

// 照片Base64的字符串
photoDate = bundle.getString("photoString");

// 操作ProgressBar控件
circleProgressBar = (ProgressBar) findViewById(R.id.circleProgressBar);
circleProgressBar.setVisibility(View.VISIBLE);
circleProgressBar.setProgress(0);

lv = (ListView) findViewById(R.id.lvPerson);

// 启动一个后台线程
handler.postDelayed(new Runnable() {
@Override
public void run() {

aList = getData("1",pageSize,useridstring);

if (aList == null) {

// 提示没有数据
dialog.setTitle("提示");
dialog.setMessage("无相关照片！");
dialog.setPositiveButton("确定", null);
dialog.show();

} else {

// 这里下载数据
adapter = new EditAdapter(EditPerson.this, aList,
R.layout.recognitionitem);
lv.setAdapter(adapter);

}

circleProgressBar.setVisibility(View.GONE);
}
}, 2000);

lv.setOnScrollListener(this);

// 点"新增"按钮,存储图片到云端，保存到数据库
btnAdd.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
// 保存用户信息
if (!IsSave()) {

return;

}

dialog.setTitle("提示");
dialog.setMessage("新增成功！");
dialog.setPositiveButton("确定",new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog,
int which) {
Intent intent = new Intent(EditPerson.this,
Camera.class);
startActivity(intent);
}
});
dialog.show();
}
});

// 点"覆盖"按钮,先删除本地手机上缓存里的照片，存储图片到云端，保存缩略图到数据库
btnRe.setOnClickListener(new View.OnClickListener() {
public void onClick(View v) {
//通过RADIOBUTTON按钮取得图片名称
String strPicName="";
for (int i = 0, j = lv.getCount(); i < j; i++) {
/*View child = lv.getChildAt(i);
RadioButton rdobtn = (RadioButton) child.findViewById(R.id.rdoperdson);
if (rdobtn.isChecked()) {
strPicName = aList.get(i).get("PicName").toString();
}*/
if (adapter.states.get(String.valueOf(i))==true)
{
strPicName = aList.get(i).get("PicName").toString();
}
}
if(strPicName=="")
{
dialog.setTitle("提示");
dialog.setMessage("请选择");
dialog.setPositiveButton("确定", null);
dialog.show();
return;
}
if(!IsCover(strPicName)){
return;
}

dialog.setTitle("提示");
dialog.setMessage("覆盖成功！");
dialog.setPositiveButton("确定",new DialogInterface.OnClickListener() {

@Override
public void onClick(DialogInterface dialog,
int which) {
Intent intent = new Intent(EditPerson.this,
Camera.class);
startActivity(intent);
}
});
dialog.show();

}
});
}
//保存图片
private boolean IsSave() {
// TODO Auto-generated method stub

//progressDialog = ProgressDialog.show(SaveUserInfo.this, "请稍等...", "获取数据中...", true);

CallWS callWS = new CallWS();
String saveResult = callWS.AddUserPic(photoDate, useridstring);

if (saveResult.equals("-1")) {

//progressDialog.dismiss();

Alert("保存失败！");

return false;

}

//progressDialog.dismiss();

return true;

}
//覆盖图片
private boolean IsCover(String strPicName) {
// TODO Auto-generated method stub

//progressDialog = ProgressDialog.show(SaveUserInfo.this, "请稍等...", "获取数据中...", true);

//先删除本地手机上缓存里的照片
// 缩略图在本地的路径
File file = new File(imagePath+strPicName+ "_thumbnail.jpg");
//原始图在本地路径
File filenew = new File(imagePath+strPicName+ ".jpg");
// 如果本地有保存，删除
if (file != null) {
file.delete();

}
// 如果本地有保存原始图，删除
if (filenew != null) {
filenew.delete();

}

CallWS callWS = new CallWS();
String saveResult = callWS.CoverUserPic(photoDate, useridstring,strPicName);

if (saveResult.equals("-1")) {

//progressDialog.dismiss();

Alert("保存失败！");

return false;

}

//progressDialog.dismiss();

return true;

}

// 定义一个生成数据的方法,因为HashMap的键对应的值可能是String或者是资源的ID，所以这里用的是HashMap<String,
// Object>
private List<HashMap<String, Object>> getData(String pageIndex, String pageSize, String useridstring) {

try {

List<HashMap<String, Object>> aList = new ArrayList<HashMap<String, Object>>();

// 获得识别的图片列表
CallWS callWS = new CallWS();
String photoInfos = callWS.GetPhotoListByUserid(pageIndex,pageSize,useridstring);

// String photoInfos=
// "{\"code\":1,\"totalNum\":1,\"data\":[{\"URL\":\"http://192.169.0.8/webServices1/Photo//03521501-EA4D-4962-B12F-618A3A39F43B_3.jpg\",\"face\":\"\",\"imageName\":\"240E7856-C2F7-4381-B9B1-AE8F3A787890_1\",\"similiar\":0.8389}]}";

if (photoInfos==null || photoInfos.length() == 0) {

return null;

}

JSONObject obj = new JSONObject(photoInfos);
String returnCode = obj.get("code").toString();
if (returnCode.equals("-1")) {
return null;
}

datasize = Integer.parseInt(obj.get("total").toString());

JSONArray numberList = obj.getJSONArray("data");
for (int i = 0; i < numberList.length(); i++) {
// System.out.println(numberList.getJSONObject(i).getString("name"));
HashMap<String, Object> map = new HashMap<String, Object>();
String PhotoName = numberList.getJSONObject(i).getString(
"PhotoName");
String PhotoUrl = numberList.getJSONObject(i).getString(
"PhotoUrl");
String strid = numberList.getJSONObject(i).getString("ID");

map.put("PhotoUrl", PhotoUrl);
map.put("id", strid);
map.put("PhotoName", imagePath+PhotoName+ "_thumbnail.jpg");
map.put("PicName", PhotoName);
aList.add(map);

imageNames.add(numberList.getJSONObject(i).getString(
"PhotoName"));
}

return aList;

} catch (Exception e) {

return null;

}

}

@Override
public void onScroll(AbsListView view, int firstVisibleItem,
int visibleItemCounts, int totalItemCount) {
// TODO Auto-generated method stub
visibleItemCount = visibleItemCounts;
visibleLastIndex = firstVisibleItem + visibleItemCount;

// 如果所有的记录选项等于数据集的条数，则移除列表底部视图
if (totalItemCount >= datasize&& datasize > 0) {
/*
* listView.removeFooterView(loadMoreView); Toast.makeText(this,
* "数据全部加载完!", Toast.LENGTH_LONG).show();
*/
isOver = true;

}

}

@Override
public void onScrollStateChanged(AbsListView view, int scrollState) {
// 数据集最后一项的索引
int itemsLastIndex = adapter.getCount() - 1;
int lastIndex = itemsLastIndex + 1;
if (scrollState == OnScrollListener.SCROLL_STATE_IDLE
&& visibleLastIndex == lastIndex && !isOver) {

// 如果是自动加载,可以在这里放置异步加载数据的代码
// lv.addFooterView(btnMore); //设置列表底部视图

// btnMore.setText("正在加载中..."); // 设置按钮文字

circleProgressBar.setVisibility(View.VISIBLE);
circleProgressBar.setProgress(0);

handler.postDelayed(new Runnable() {

@Override
public void run() {
loadMoreData();
adapter.notifyDataSetChanged();
circleProgressBar.setVisibility(View.GONE);

// btnMore.setText("查看更多..."); // 恢复按钮文字
// lv.removeFooterView(btnMore);
}
}, 2000);

}
}

private void Alert(String info) {

dialog.setTitle("提示");
dialog.setMessage(info);
dialog.setPositiveButton("确定", null);
dialog.show();

}
/**
* 加载更多数据
*/
private boolean loadMoreData() {
// 获得当前页面的页数
pageIndex++;

List<HashMap<String, Object>> aList = getData(Integer.toString(pageIndex),
pageSize, useridstring);

if (aList == null) {
pageIndex--;
return false;

}

adapter.addNewsItem(aList);

return true;

}
}

XML页面

editperson.xml

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent"
android:layout_height="fill_parent"
android:orientation="vertical"
android:gravity="center_horizontal">

<ProgressBar android:layout_width="wrap_content"
android:id="@+id/circleProgressBar" android:layout_height="wrap_content"></ProgressBar>

<ListView
android:id="@+id/lvPerson"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_above="@+id/linearLayout1"
android:layout_alignParentTop="true">

</ListView>
<LinearLayout
android:id="@+id/linearLayout1"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_alignParentBottom="true"
android:layout_centerHorizontal="true">

<Button
android:id="@+id/btnBack"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:text="上一步" />

<Button
android:id="@+id/btnAdd"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:text="新增" />

<Button
android:id="@+id/btnRe"
android:layout_width="90dp"
android:layout_height="wrap_content"
android:text="覆盖" />

</LinearLayout>
</RelativeLayout>

editpersonitem.xml页面

<?xml version="1.0" encoding="utf-8"?>
<RelativeLayout xmlns:android="http://schemas.android.com/apk/res/android"
android:layout_width="fill_parent" android:layout_height="fill_parent">

<LinearLayout
android:layout_width="match_parent"
android:layout_height="match_parent"
android:orientation="horizontal" >

<ImageView
android:id="@+id/imgperson"
android:layout_width="50dp"
android:layout_height="50dp"
android:layout_marginLeft="20dip" />

<RadioButton
android:id="@+id/rdoperdson"
android:layout_width="wrap_content"
android:layout_height="wrap_content"
android:layout_marginLeft="100dip"/>

</LinearLayout>
</RelativeLayout>

已经调试通过，避免空指针 java.lang.NullPointerException 错误 ，网上之前找的给Radiobutton 设置ID为position的方法，两种都尝试过，都会再不同情况出现空指针错误