Android 对listview数据的增删改查(2)

package com.updatelistview.main;      import java.util.ArrayList;   import java.util.HashMap;      import Android.app.Activity;   import android.app.AlertDialog;   import android.content.Context;   import android.content.DialogInterface;   import android.os.Bundle;   import android.view.LayoutInflater;   import android.view.View;   import android.view.View.OnClickListener;   import android.widget.Button;   import android.widget.EditText;   import android.widget.LinearLayout;   import android.widget.ListView;   import android.widget.SimpleAdapter;   import android.widget.Toast;      public class UpdateListViewActivity extends Activity {       // 控件        private Button addBtn;       private Button deleteBtn;       private Button editBtn;       private Button queryBtn;       private ListView listview;       // 数组        private SimpleAdapter listItemAdapter;       private ArrayList<hashmap<string, object="">> listItem = null;          /** Called when the activity is first created. */       @Override       public void onCreate(Bundle savedInstanceState) {           super.onCreate(savedInstanceState);           setContentView(R.layout.main);              // 获取控件            addBtn = (Button) findViewById(R.id.add_id);           deleteBtn = (Button) findViewById(R.id.delete_id);           editBtn = (Button) findViewById(R.id.edit_id);           queryBtn = (Button) findViewById(R.id.query_id);           listview = (ListView) findViewById(R.id.show_result);              // 初始化数据            init();              // 设置控件事件监听            addBtn.setOnClickListener(addClick);           deleteBtn.setOnClickListener(deleteClick);           editBtn.setOnClickListener(editClick);           queryBtn.setOnClickListener(queryClick);          }          // 添加事件响应        OnClickListener addClick = new OnClickListener() {              @Override           public void onClick(View v) {               // TODO Auto-generated method stub                   // 加载输入框的布局文件                LayoutInflater inflater = (LayoutInflater) UpdateListViewActivity.this                       .getSystemService(Context.LAYOUT_INFLATER_SERVICE);               final LinearLayout layout = (LinearLayout) inflater.inflate(                       R.layout.input_add, null);                  // 弹出的对话框                   new AlertDialog.Builder(UpdateListViewActivity.this)                       /* 弹出窗口的最上头文字 */                       .setTitle("添加一条数据")                       /* 设置弹出窗口的图式 */                       .setIcon(android.R.drawable.ic_dialog_info)                       /* 设置弹出窗口的信息 */                       .setMessage("请输入添加的内容")                       .setView(layout)                       .setPositiveButton("确定",                               new DialogInterface.OnClickListener() {                                   public void onClick(                                           DialogInterface dialoginterface, int i) {                                          EditText inputStringr = (EditText) layout                                               .findViewById(R.id.input_add_string);                                          String str = inputStringr.getText()                                               .toString();                                          if (str == null || str.equals("")) {                                              Toast.makeText(getApplicationContext(),                                                   "添加的内容不能为空", Toast.LENGTH_SHORT)                                                   .show();                                       } else {                                           HashMap<string, object=""> map = new HashMap<string, object="">();                                           map.put("viewspot", str);                                           map.put("add", R.drawable.right);                                           listItem.add(0, map);                                           // 如果在前面添加一条数据添加                                            // listItem.add(map);                                            listItemAdapter.notifyDataSetChanged();                                           Toast.makeText(                                                   UpdateListViewActivity.this,                                                   "添加的一条数据为:" + str + "",                                                   Toast.LENGTH_SHORT).show();                                          }                                      }                               })                       .setNegativeButton("取消",                               new DialogInterface.OnClickListener() { /* 设置跳出窗口的返回事件 */                                   public void onClick(                                           DialogInterface dialoginterface, int i) {                                       Toast.makeText(UpdateListViewActivity.this,                                               "取消了删除数据", Toast.LENGTH_SHORT)                                               .show();                                      }                               }).show();              }       };          // 删除事件响应        OnClickListener deleteClick = new OnClickListener() {              @Override           public void onClick(View v) {               // TODO Auto-generated method stub                   /**               * listItem.clear();清空所有数据               *               * */                  /*               * listItem.clear();               * listItemAdapter.notifyDataSetChanged();               */                  // 加载输入框的布局文件                LayoutInflater inflater = (LayoutInflater) UpdateListViewActivity.this                       .getSystemService(Context.LAYOUT_INFLATER_SERVICE);               final LinearLayout layout = (LinearLayout) inflater.inflate(                       R.layout.input_delete, null);                  // 弹出的对话框                   new AlertDialog.Builder(UpdateListViewActivity.this)                       /* 弹出窗口的最上头文字 */                       .setTitle("删除一条数据")                       /* 设置弹出窗口的图式 */                       .setIcon(android.R.drawable.ic_dialog_info)                       /* 设置弹出窗口的信息 */                       .setMessage("请输入删除的索引")                       .setView(layout)                       .setPositiveButton("确定",                               new DialogInterface.OnClickListener() {                                   public void onClick(                                           DialogInterface dialoginterface, int i) {                                          EditText inputNumber = (EditText) layout                                               .findViewById(R.id.input_delete_number);                                          String str = inputNumber.getText()                                               .toString();                                          if (str == null || str.equals("")) {                                              Toast.makeText(getApplicationContext(),                                                   "请输入一个数字", Toast.LENGTH_SHORT)                                                   .show();                                       } else {                                           int number = Integer.valueOf(str);                                              int size = listItem.size();                                              // 判断数字是否超出数组索引范围                                            if (number >= size) {                                               Toast.makeText(                                                       getApplicationContext(),                                                       "没有找到删除的数据索引",                                                       Toast.LENGTH_SHORT).show();                                              } else {                                                  String value = listItem.get(number)                                                       .toString();                                               listItem.remove(number);                                               listItemAdapter                                                       .notifyDataSetChanged();                                               Toast.makeText(                                                       UpdateListViewActivity.this,                                                       "删除的数据为:" + value + "",                                                       Toast.LENGTH_SHORT).show();                                              }                                       }                                      }                               })                       .setNegativeButton("取消",                               new DialogInterface.OnClickListener() { /* 设置跳出窗口的返回事件 */                                   public void onClick(                                           DialogInterface dialoginterface, int i) {                                       Toast.makeText(UpdateListViewActivity.this,                                               "取消了删除数据", Toast.LENGTH_SHORT)                                               .show();                                      }                               }).show();              }       };       // 修改事件响应        OnClickListener editClick = new OnClickListener() {              @Override           public void onClick(View v) {               // TODO Auto-generated method stub                // 加载输入框的布局文件                LayoutInflater inflater = (LayoutInflater) UpdateListViewActivity.this                       .getSystemService(Context.LAYOUT_INFLATER_SERVICE);               final LinearLayout layout = (LinearLayout) inflater.inflate(                       R.layout.input_edit, null);                  // 弹出的对话框                   new AlertDialog.Builder(UpdateListViewActivity.this)                       /* 弹出窗口的最上头文字 */                       .setTitle("修改一条数据")                       /* 设置弹出窗口的图式 */                       .setIcon(android.R.drawable.ic_dialog_info)                       /* 设置弹出窗口的信息 */                       .setMessage("请输入修改的索引及内容")                       .setView(layout)                       .setPositiveButton("确定",                               new DialogInterface.OnClickListener() {                                   public void onClick(                                           DialogInterface dialoginterface, int i) {                                          EditText inputEditNumber = (EditText) layout                                               .findViewById(R.id.input_edit_number);                                          String numberStr = inputEditNumber                                               .getText().toString();                                          EditText inputEditString = (EditText) layout                                               .findViewById(R.id.input_edit_string);                                          String editStr = inputEditString.getText()                                               .toString();                                          if (numberStr == null                                               || numberStr.equals("")) {                                              Toast.makeText(getApplicationContext(),                                                   "请输入要修改的索引", Toast.LENGTH_SHORT)                                                   .show();                                       } else {                                           int number = Integer.valueOf(numberStr);                                              int size = listItem.size();                                              // 判断数字是否超出数组索引范围                                            if (number >= size) {                                               Toast.makeText(                                                       getApplicationContext(),                                                       "没有找到修改的数据索引",                                                       Toast.LENGTH_SHORT).show();                                              } else {                                                  HashMap<string, object=""> map = new HashMap<string, object="">();                                               map.put("viewspot", editStr);                                               map.put("add", R.drawable.right);                                                  listItem.set(number, map);                                               listItemAdapter                                                       .notifyDataSetChanged();                                                  Toast.makeText(                                                       UpdateListViewActivity.this,                                                       "数据修改为:" + editStr + "",                                                       Toast.LENGTH_SHORT).show();                                              }                                       }                                      }                               })                       .setNegativeButton("取消",                               new DialogInterface.OnClickListener() { /* 设置跳出窗口的返回事件 */                                   public void onClick(                                           DialogInterface dialoginterface, int i) {                                       Toast.makeText(UpdateListViewActivity.this,                                               "取消了修改数据", Toast.LENGTH_SHORT)                                               .show();                                      }                               }).show();              }       };          // 查询事件响应        OnClickListener queryClick = new OnClickListener() {              @Override           public void onClick(View v) {               // TODO Auto-generated method stub                // 查询数据                listItemAdapter.notifyDataSetChanged();           }       };          // 初始化数据        private void init() {              listItem = new ArrayList<hashmap<string, object="">>();           for (int i = 0; i < 12; i++) {               HashMap<string, object=""> map = new HashMap<string, object="">();               map.put("viewspot", "北京故宫，颐和园" + i);               map.put("add", R.drawable.right);               listItem.add(map);           }           listItemAdapter = new SimpleAdapter(getApplicationContext(), listItem,// 数据源                    R.layout.items, new String[] { "viewspot", "add" }, new int[] {                           R.id.viewspot, R.id.add });           listview.setAdapter(listItemAdapter);          }      }