ListView滾動翻頁,Radiobutton實現單選

本文轉載自查看原文 2012-06-06 10:21 3557 Android

EditAdapter.java頁面

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 {
     // 定義一個LayoutInflater來導入資源文件用
    LayoutInflater inflater;
     // 用來接收要綁定的數據
    List<HashMap<String, Object>> aList;
     // 要綁定的資源文件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;
    }

     // 綁定的數據的長度，也就是ListView項的個數
    @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方法用來設置與視圖關聯的標簽，我的理解就是把和它相關的ViewHolder存儲起來，到用的時候再拿出來
            convertView.setTag(holder);
        } else {
             // 如果不為null就直接通過getTag取出來
            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
         // 圖片網絡路徑
        String imageUrl = this.aList.get(position).get("PhotoUrl").toString();
         // 圖片本地路徑
        String imageName = this.aList.get(position).get("PhotoName").toString();

         // 縮略圖在本地的路徑
        Bitmap imageBitmap = Utility.getLoacalBitmap(imageName);
         // 如果本地有保存
         if (imageBitmap != null) {
            holder.itemview.setImageBitmap(imageBitmap);

        } else { // 如果本地沒有保存

            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(), "選中的是第"+position+"條記錄", 0).show();

                 // 重置，確保最多只有一項被選中
                 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;



    }

     /**
     * 添加數據列表項
     *
     * @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頁面

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; // 最后的可視項索引
     private int visibleItemCount; // 當前窗口可見項總數
     private int datasize = 0; // 數據集的條數
     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;
     // 彈出窗口
    AlertDialog.Builder dialog = null;
     // 每滾動一頁顯示多少條數據
     private String pageSize = "5";
     // 第幾頁
     private int pageIndex = 1;


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

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

         // 點"上一步"按鈕跳轉到之前有搜索數據的搜索頁面，不重新加載,並銷毀此頁
        btnBack.setOnClickListener( new View.OnClickListener() {
             public void onClick(View v) {

                finish();
            }
        });

        dialog = new AlertDialog.Builder( this);

         // 獲得前面的activity傳來的參數
        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);

         // 啟動一個后台線程
        handler.postDelayed( new Runnable() {
            @Override
             public void run() {

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

                 if (aList == null) {

                     // 提示沒有數據
                    dialog.setTitle("提示");
                    dialog.setMessage("無相關照片！");
                    dialog.setPositiveButton("確定", null);
                    dialog.show();

                } else {

                     // 這里下載數據
                    adapter = new EditAdapter(EditPerson. this, aList,
                            R.layout.recognitionitem);
                    lv.setAdapter(adapter);

                }

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

        lv.setOnScrollListener( this);

         // 點"新增"按鈕,存儲圖片到雲端，保存到數據庫
        btnAdd.setOnClickListener( new View.OnClickListener() {
             public void onClick(View v) {
                 // 保存用戶信息
                 if (!IsSave()) {

                     return;

                }


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

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

         // 點"覆蓋"按鈕,先刪除本地手機上緩存里的照片，存儲圖片到雲端，保存縮略圖到數據庫
        btnRe.setOnClickListener( new View.OnClickListener() {
             public void onClick(View v) {
             // 通過RADIOBUTTON按鈕取得圖片名稱
                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("請選擇");
                    dialog.setPositiveButton("確定", null);
                    dialog.show();
                     return;
                }
                 if(!IsCover(strPicName)){
                     return;
                }

                dialog.setTitle("提示");
                dialog.setMessage("覆蓋成功！");
                dialog.setPositiveButton("確定", new DialogInterface.OnClickListener() {

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




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

         // progressDialog = ProgressDialog.show(SaveUserInfo.this, "請稍等...", "獲取數據中...", true);




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

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

             // progressDialog.dismiss();

            Alert("保存失敗！");

             return false;

        }

         // progressDialog.dismiss();

         return true;

    }
     // 覆蓋圖片
     private boolean IsCover(String strPicName) {
         // TODO Auto-generated method stub

         // progressDialog = ProgressDialog.show(SaveUserInfo.this, "請稍等...", "獲取數據中...", true);




         // 先刪除本地手機上緩存里的照片
         // 縮略圖在本地的路徑
        File file  = new File(imagePath+strPicName+ "_thumbnail.jpg");
         // 原始圖在本地路徑
        File filenew  = new File(imagePath+strPicName+ ".jpg");
         // 如果本地有保存，刪除
         if (file != null) {
            file.delete();

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

        }

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

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

             // progressDialog.dismiss();

            Alert("保存失敗！");

             return false;

        }

         // progressDialog.dismiss();

         return true;

    }

     // 定義一個生成數據的方法,因為HashMap的鍵對應的值可能是String或者是資源的ID，所以這里用的是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>>();

             // 獲得識別的圖片列表
            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;

         // 如果所有的記錄選項等於數據集的條數，則移除列表底部視圖
         if (totalItemCount >= datasize&& datasize > 0) {
             /*
             * listView.removeFooterView(loadMoreView); Toast.makeText(this,
             * "數據全部加載完!", Toast.LENGTH_LONG).show();
              */
            isOver = true;

        }

    }

    @Override
     public void onScrollStateChanged(AbsListView view, int scrollState) {
         // 數據集最后一項的索引
         int itemsLastIndex = adapter.getCount() - 1;
         int lastIndex = itemsLastIndex + 1;
         if (scrollState == OnScrollListener.SCROLL_STATE_IDLE
                && visibleLastIndex == lastIndex && !isOver) {

             // 如果是自動加載,可以在這里放置異步加載數據的代碼
             // lv.addFooterView(btnMore); // 設置列表底部視圖

             // btnMore.setText("正在加載中..."); // 設置按鈕文字

            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..."); // 恢復按鈕文字
                     // lv.removeFooterView(btnMore);
                }
            }, 2000);

        }
    }

     private void Alert(String info) {

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

    }
     /**
     * 加載更多數據
      */
     private boolean loadMoreData() {
         // 獲得當前頁面的頁數
        pageIndex++;

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

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

        }

        adapter.addNewsItem(aList);

         return true;

    }

}

XML頁面

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="覆蓋" />

    </LinearLayout>

</RelativeLayout>

editpersonitem.xml頁面

<?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>

已經調試通過，避免空指針

java.lang.NullPointerException 錯誤，網上之前找的給Radiobutton 設置ID為position的方法，兩種都嘗試過，都會再不同情況出現空指針錯誤

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