Android 个人理财工具三：添加账单页面 上

       ColaBox 登记收支记录终于进入了复杂阶段了。这个界面我也是查找了很多资料以及打开android的源代码看了后才完成了，现在想来Google的开源真是明智的啊。

       从前面的登录页面跳转进入添加账单页面。这个页面主要是用来登记收支记录的。说白了就是往数据库录入明细。

       表结构如下：

       db.execSQL("CREATE TABLE bills ("
                 + "_ID INTEGER PRIMARY KEY," //id
                 + "fee integer,"                                     //费用
                 +"acctitemid integer,"                          //账目类型
                 + "userid integer,"                                //使用者
                 + "sdate TEXT,"                                 //日期
                 + "stime TEXT,"                                //时间
                 + "desc TEXT"                                  //备注
                 + ");");

       可以看到主要是录入这些数据。首先是布置界面，我目前想到的用个tablelayout来布局。

       最后布局就是如下图（图1）这样：

       在这儿我首先需要设置账目，前面我们已经初始化过账目的数据。

       账目应该是一个ExpandableListActivity 2层的结构。需要从数据库里面读取。我在账目后面放了一个editview 只读没有光标的，也就是在这儿不可录入，在该editview的onclick事件里面我们打开账目选择界面。如下图：

       图2 账目选择：

       在这个界面中点击子节点就返回前面界面，把选择的账目传递过去。在这有个问题，如果用户需要录入的账目没有怎么办？

       所以我这没有用dialog方式而是用了ExpandableListActivity。在这个界面中如果长点某个子节点就弹出管理账目菜单，来维护账目，如下图所示：

       图3 账目选择菜单：

       图4 编辑账目：

       上面这些流程说起来很简单，可是当我用andriod编写时，遇到了很多问题，不过一个个都被我解决了，这正是编程的快乐所在。

       关于ExpandableListActivity 大家可以参考android 里面apidemos 里面ExpandableList1、ExpandableList2、ExpandableList3。

       这里面对熟悉这个ui还是很有帮助的。在ExpandableList2 里面就是从数据库进行读取的例子。当然android里面那个我是没太看明白因为他引用了import android.provider.Contacts.People; 联系人部分的框架，而我目前对数据库的操作和他不一样，我都是直接sql访问。

       但是你只要搞定2个cursor就ok了，Cursor groupCursor childCursor ，其他都由SimpleCursorTreeAdapter帮你实现了。

       下面我们来看看如何使用SimpleCursorTreeAdapter。

Java代码      

//首先要实现groupcursor就是父节点游标,这个其实就是我的acctitem表的 
//select * from accitem where pid is null 的结果 
Cursor groupCursor = billdb.getParentNode(); 
  // Cache the ID column index 
mGroupIdColumnIndex = groupCursor.getColumnIndexOrThrow("_ID"); 
  // Set up our adapter 
mAdapter = new MyExpandableListAdapter(groupCursor, this,  android.R.layout.simple_expandable_list_item_1, 
 android.R.layout.simple_expandable_list_item_1, 
  new String[] { "NAME" }, // Name for group layouts 
  new int[] { android.R.id.text1 }, 
  new String[] { "NAME" }, // 
  new int[] { android.R.id.text1 }); 
setListAdapter(mAdapter); 
//然后我要实现childCursor 
//其实就是select * from acctitem where id=pid 的结果 
public class MyExpandableListAdapter extends SimpleCursorTreeAdapter { 
public MyExpandableListAdapter(Cursor cursor, Context context, 
    int groupLayout, int childLayout, String[] groupFrom, 
    int[] groupTo, String[] childrenFrom, int[] childrenTo) 
 { 
   super(context, cursor, groupLayout, groupFrom, groupTo, 
     childLayout, childrenFrom, childrenTo); 
 } 
protected Cursor getChildrenCursor(Cursor groupCursor) { 
 String pid = groupCursor.getLong(mGroupIdColumnIndex) + ""; 
 // Log.v("cola","pid="+pid); 
 return billdb.getChildenNode(pid); 
 } 
} 
//我们看看Billdbhelper里面的cursor 
 public Cursor getParentNode(){ 
  return db.query("acctitem", new String[]{"_id", "name" }, "pid is null", null, null, null, "pid,_id");  
  
 } 
  
 public Cursor getChildenNode(String pid){ 
  Log.v("cola","run getchildenNode"); 
  return db.query("acctitem", new String[]{"_id", "name" }, "pid="+pid, null, null, null, "_id");  
 } 
//只要这几步一个2级的tree list就可以出现了. 

上面其实才是刚开始，后面我们需要使用一个自定义的Dialog 类似于一个inputBox，因为我们新增账目是需要输入账目的名称。就是上面图4表现的。

       虽然alertDialog提供了很多方法，可以选择list、treelist、radio，可惜就是不能录入text。

       这里我参考了api demos 里面的 DateWidgets1.java 和源代码里面DatePickerDialog.java 。

       我们可以从alertdialog 继承，然后添加一个Editview 最后把数据返回出来。只要把上面我说的2个java看清楚了后处理起来就简单了。

       主要是一个回调函数的用法。下面看代码：

Java代码

// 
public class Dialog_edit extends AlertDialog implements OnClickListener { 
 private String text = ""; 
 private EditText edit; 
 private OnDateSetListener mCallback; //定义回调函数 
 private LinearLayout layout; 
 public interface OnDateSetListener { //回调接口 
  void onDateSet(String text); 
 } 
 protected Dialog_edit(Context context, String title, String value, 
   OnDateSetListener Callback) { 
  super(context); 
  mCallback = Callback; 
  TextView label = new TextView(context); 
  label.setText("hint"); 
  // setView(label); 
  edit = new EditText(context); 
  edit.setText(value); 
  layout = new LinearLayout(context); 
  layout.setOrientation(LinearLayout.VERTICAL); 
  // LinearLayout.LayoutParams param = 
  // new LinearLayout.LayoutParams(100, 40); 
  // layout.addView(label, param); 
  LinearLayout.LayoutParams param2 = new LinearLayout.LayoutParams(200, 
    50); 
  layout.addView(edit, param2); 
  //添加edit 
  setView(layout); 
  setTitle(title); 
  setButton("确定", this); 
  setButton2("取消", (OnClickListener) null); 
 } 
 public void onClick(DialogInterface dialog, int which) { 
  // Log.v("cola","U click which="+which); 
  text = edit.getText().toString(); 
  Log.v("cola", "U click text=" + text); 
  if (mCallback != null) 
   mCallback.onDateSet(text); //使用回调返回录入的数据 
 } 
} 

       这样我们就完成了自定义的dialog 我们可以使用它来新增和编辑账目。对于账目的增删改就是sql的事情了。

       在这我又遇到一个问题就是我新增一个账目后如何来刷新界面，从而反映账目修改后的变化。

       在这我开始以为只要使用getExpandableListView().invalidate(); 就可以了。

       因为我之前在ExpandableList1.java例子里面，使用它可以刷新界面。

       在那个例子里面我修改了数组后调用该方法，界面就刷新了，而在这SimpleCursorTreeAdapter就行不通了，我想

       应该只要刷新cursor应该就可以了，后来找到了notifyDataSetChanged，呵呵，果然可以了。 这样账目的录入和管理就搞定了。

       下面给出目前最新的代码。

       首先是账目管理：

Java代码

package com.cola.ui; 
import android.app.AlertDialog; 
import android.app.ExpandableListActivity; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.Intent; 
import android.database.Cursor; 
import android.os.Bundle; 
import android.provider.Contacts.People; 
import android.util.Log; 
import android.view.ContextMenu; 
import android.view.MenuItem; 
import android.view.View; 
import android.view.ContextMenu.ContextMenuInfo; 
import android.widget.ExpandableListAdapter; 
import android.widget.ExpandableListView; 
import android.widget.SimpleCursorTreeAdapter; 
import android.widget.TextView; 
import android.widget.ExpandableListView.ExpandableListContextMenuInfo; 
/** 
 * Demonstrates expandable lists backed by Cursors 
 */ 
public class Frm_Editacctitem extends ExpandableListActivity { 
 private int mGroupIdColumnIndex; 
 private String mPhoneNumberProjection[] = new String[] { People.Phones._ID, 
   People.Phones.NUMBER }; 
 private ExpandableListAdapter mAdapter; 
 BilldbHelper billdb; 
 Dialog_edit newdialog; 
  
  
 private ExpandableListContextMenuInfo info; 
  
  
 @Override 
 public void onCreate(Bundle savedInstanceState) { 
  super.onCreate(savedInstanceState); 
  setTitle("ColaBox-选择账目"); 
  billdb = new BilldbHelper(this); 
  // Query for people 
  Cursor groupCursor = billdb.getParentNode(); 
  // Cache the ID column index 
  mGroupIdColumnIndex = groupCursor.getColumnIndexOrThrow("_ID"); 
  // Set up our adapter 
  mAdapter = new MyExpandableListAdapter(groupCursor, this, 
    android.R.layout.simple_expandable_list_item_1, 
    android.R.layout.simple_expandable_list_item_1, 
    new String[] { "NAME" }, // Name for group layouts 
    new int[] { android.R.id.text1 }, new String[] { "NAME" }, // 
    new int[] { android.R.id.text1 }); 
  setListAdapter(mAdapter); 
  registerForContextMenu(getExpandableListView()); 
 } 
  
 @Override 
 public boolean onChildClick(ExpandableListView parent, View v, int groupPosition, int childPosition, long id) 
 { 
  Bundle bundle = new Bundle(); 
  bundle.putString("DataKey", ((TextView)v).getText().toString());//给bundle 写入数据 
  Intent mIntent = new Intent(); 
  mIntent.putExtras(bundle); 
  setResult(RESULT_OK, mIntent); 
  billdb.close(); 
  finish(); 
  return true;  
 } 
 @Override 
 public void onCreateContextMenu(ContextMenu menu, View v, 
   ContextMenuInfo menuInfo) { 
  super.onCreateOptionsMenu(menu); 
  if (ExpandableListView 
    .getPackedPositionType(((ExpandableListContextMenuInfo) menuInfo).packedPosition) == 1) { 
   Log.v("cola", "run menu"); 
   menu.setHeaderTitle("菜单"); 
   menu.add(0, 1, 0, "新 增"); 
   menu.add(0, 2, 0, "删 除"); 
   menu.add(0, 3, 0, "编 辑"); 
  } 
 } 
 @Override 
 public boolean onContextItemSelected(MenuItem item) { 
  info = (ExpandableListContextMenuInfo) item.getMenuInfo(); 
  if (item.getItemId() == 1) { 
   // Log.v("cola","id"+info.id); 
   newdialog = new Dialog_edit(this, "请输入新增账目的名称", "", 
     mDialogClick_new); 
   newdialog.show(); 
  } else if (item.getItemId() == 2) { 
   new AlertDialog.Builder(this).setTitle("提示").setMessage("确定要删除'"+((TextView)info.targetView).getText().toString()+"'这个账目吗?") 
     .setIcon(R.drawable.quit).setPositiveButton("确定", 
       new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, 
          int whichButton) { 
         billdb.Acctitem_delitem((int)info.id); 
         updatedisplay(); 
        } 
       }).setNegativeButton("取消", 
       new DialogInterface.OnClickListener() { 
        public void onClick(DialogInterface dialog, 
          int whichButton) { 
         // 取消按钮事件 
        } 
       }).show(); 
  } else if (item.getItemId() == 3) { 
   newdialog = new Dialog_edit(this, "请修改账目名称", 
     ((TextView) info.targetView).getText().toString(), 
     mDialogClick_edit); 
   newdialog.show(); 
  } 
  return false; 
 } 
 private Dialog_edit.OnDateSetListener mDialogClick_new = new Dialog_edit.OnDateSetListener() { 
  public void onDateSet(String text) { 
   Log.v("cola", "new acctitem"); 
   billdb.Acctitem_newitem(text,ExpandableListView.getPackedPositionGroup(info.packedPosition)); 
   updatedisplay(); 
  } 
 }; 
  
 private Dialog_edit.OnDateSetListener mDialogClick_edit = new Dialog_edit.OnDateSetListener() { 
  public void onDateSet(String text) {    
   billdb.Acctitem_edititem(text,(int)info.id); 
   updatedisplay(); 
  } 
 }; 
 private void updatedisplay(){ 
  Log.v("cola", "update display"); 
  ((MyExpandableListAdapter)mAdapter).notifyDataSetChanged(); 
 } 
  
 public class MyExpandableListAdapter extends SimpleCursorTreeAdapter { 
  public MyExpandableListAdapter(Cursor cursor, Context context, 
    int groupLayout, int childLayout, String[] groupFrom, 
    int[] groupTo, String[] childrenFrom, int[] childrenTo) { 
   super(context, cursor, groupLayout, groupFrom, groupTo, 
     childLayout, childrenFrom, childrenTo); 
  } 
  @Override 
  protected Cursor getChildrenCursor(Cursor groupCursor) { 
   String pid = groupCursor.getLong(mGroupIdColumnIndex) + ""; 
   // Log.v("cola","pid="+pid); 
   return billdb.getChildenNode(pid); 
  } 
  @Override 
  public long getGroupId(int groupPosition) { 
   // Log.v("cola", "getGroupId " + groupPosition); 
   Cursor groupCursor = (Cursor) getGroup(groupPosition); 
   return groupCursor.getLong(mGroupIdColumnIndex); 
  } 
  @Override 
  public long getChildId(int groupPosition, int childPosition) { 
   // Log.v("cola", "getChildId " + groupPosition + "," + 
   // childPosition); 
   Cursor childCursor = (Cursor) getChild(groupPosition, childPosition); 
   return childCursor.getLong(0); 
  } 
 } 
} 

       自定义对话框：

Java代码

package com.cola.ui; 
import android.app.AlertDialog; 
import android.content.Context; 
import android.content.DialogInterface; 
import android.content.DialogInterface.OnClickListener; 
import android.util.Log; 
import android.widget.EditText; 
import android.widget.LinearLayout; 
import android.widget.TextView; 
public class Dialog_edit extends AlertDialog implements OnClickListener { 
 private String text = ""; 
 private EditText edit; 
 private OnDateSetListener mCallback; 
 private LinearLayout layout; 
 public interface OnDateSetListener { 
  void onDateSet(String text); 
 } 
 protected Dialog_edit(Context context, String title, String value, 
   OnDateSetListener Callback) { 
  super(context); 
  mCallback = Callback; 
  TextView label = new TextView(context); 
  label.setText("hint"); 
  // setView(label); 
  edit = new EditText(context); 
  edit.setText(value); 
  layout = new LinearLayout(context); 
  layout.setOrientation(LinearLayout.VERTICAL); 
  // LinearLayout.LayoutParams param = 
  // new LinearLayout.LayoutParams(100, 40); 
  // layout.addView(label, param); 
  LinearLayout.LayoutParams param2 = new LinearLayout.LayoutParams(200, 
    50); 
  layout.addView(edit, param2); 
  setView(layout); 
  setTitle(title); 
  setButton("确定", this); 
  setButton2("取消", (OnClickListener) null); 
 } 
 public void onClick(DialogInterface dialog, int which) { 
  // Log.v("cola","U click which="+which); 
  text = edit.getText().toString(); 
  Log.v("cola", "U click text=" + text); 
  if (mCallback != null) 
   mCallback.onDateSet(text); 
 } 
} 

       数据库管理代码：

Java代码

package com.cola.ui; 
import android.content.Context; 
import android.database.Cursor; 
import android.database.sqlite.SQLiteDatabase; 
import android.util.Log; 
/** 
 * Provides access to a database of notes. Each note has a title, the note 
 * itself, a creation date and a modified data. 
 */ 
public class BilldbHelper { 
 private static final String TAG = "Cola_BilldbHelper"; 
 private static final String DATABASE_NAME = "cola.db"; 
  
 SQLiteDatabase db; 
 Context context; 
  
 BilldbHelper(Context _context) { 
  context=_context; 
  db=context.openOrCreateDatabase(DATABASE_NAME, 0, null); 
  Log.v(TAG,"db path="+db.getPath()); 
 } 
  
 public void CreateTable_acctitem() { 
  try{ 
   db.execSQL("CREATE TABLE acctitem (" 
     + "_ID INTEGER PRIMARY KEY," 
     + "PID integer," 
     + "NAME TEXT"     
     + ");"); 
   Log.v("cola","Create Table acctitem ok"); 
  }catch(Exception e){ 
   Log.v("cola","Create Table acctitem err,table exists."); 
  } 
 } 
  
 public void CreateTable_bills() { 
  try{ 
   db.execSQL("CREATE TABLE bills (" 
     + "_ID INTEGER PRIMARY KEY," 
     +" acctitemid integer,"  
     + "fee integer," 
     + "userid integer," 
     + "sdate TEXT," 
     + "stime TEXT," 
     + "desc TEXT"     
     + ");"); 
    
   Log.v("cola","Create Table acctitem ok"); 
  }catch(Exception e){ 
   Log.v("cola","Create Table acctitem err,table exists."); 
  } 
 } 
  
 public void CreateTable_colaconfig() { 
  try{ 
   db.execSQL("CREATE TABLE colaconfig (" 
     + "_ID INTEGER PRIMARY KEY," 
     + "NAME TEXT"    
     + ");"); 
   Log.v("cola","Create Table colaconfig ok"); 
  }catch(Exception e){ 
   Log.v("cola","Create Table acctitem err,table exists."); 
  } 
 } 
  
 public void InitAcctitem() { 
  try{ 
   //s.getBytes(encoding); 
   db.execSQL("insert into acctitem values (1,null,'收入')"); 
   db.execSQL("insert into acctitem values (2,1,'工资')"); 
   db.execSQL("insert into acctitem values (9998,1,'其他')"); 
   db.execSQL("insert into acctitem values (0,null,'支出')"); 
   db.execSQL("insert into acctitem values (3,0,'生活用品')"); 
   db.execSQL("insert into acctitem values (4,0,'水电煤气费')"); 
   db.execSQL("insert into acctitem values (5,0,'汽油费')"); 
   db.execSQL("insert into acctitem values (9999,0,'其他')"); 
    
   //db.execSQL("insert into bills values(100,135,10000,'','','备注')"); 
   Log.v("cola","insert into ok"); 
  }catch(Exception e) 
  { 
   Log.v("cola","init acctitem e="+e.getMessage()); 
  } 
   
 } 
 public void Acctitem_newitem(String text,int type){ 
   
  Cursor c =db.query("acctitem", new String[]{"max(_id)+1"}, "_id is not null and _id<9998", null, null, null, null); 
  c.moveToFirst(); 
  int maxid=c.getInt(0);   
  String sql="insert into acctitem values ("+maxid+","+type+",'"+text+"')"; 
  db.execSQL(sql); 
  Log.v("cola","newitem ok text="+text+" id="+type+" sql="+sql); 
   
 } 
  
 public void Acctitem_edititem(String text,int id){   
  db.execSQL("update acctitem set name='"+text+"' where _id="+id); 
  Log.v("cola","edititem ok text="+text+" id="+id); 
 } 
  
 public void Acctitem_delitem(int id){ 
   
  db.execSQL("delete from acctitem where _id="+id); 
  Log.v("cola","delitem ok id="+id); 
 } 
  
 public void QueryTable_acctitem(){ 
   
 } 
  
 public void FirstStart(){ 
  try{ 
   String col[] = {"type", "name" }; 
   Cursor c =db.query("sqlite_master", col, "name='colaconfig'", null, null, null, null); 
   int n=c.getCount(); 
   if (c.getCount()==0){ 
    CreateTable_acctitem(); 
    CreateTable_colaconfig(); 
    CreateTable_bills(); 
    InitAcctitem();   
   }    
   //getTree();    
   Log.v("cola","c.getCount="+n+""); 
      
    
  }catch(Exception e){ 
   Log.v("cola","e="+e.getMessage()); 
  } 
   
   
 } 
  
  
 public void close(){ 
  db.close(); 
 } 
  
 public Cursor getParentNode(){ 
  return db.query("acctitem", new String[]{"_id", "name" }, "pid is null", null, null, null, "pid,_id");   
  
 } 
  
 public Cursor getChildenNode(String pid){ 
  Log.v("cola","run getchildenNode"); 
  return db.query("acctitem", new String[]{"_id", "name" }, "pid="+pid, null, null, null, "_id");  
 } 
  
} 

        系列文章：

                       Android 个人理财工具六：显示账单明细 下

                       Android 个人理财工具五：显示账单明细 上

                       Android 个人理财工具四：添加账单页面 下

                       Android 个人理财工具三：添加账单页面 上

                       Android 个人理财工具二：使用SQLite实现启动时初始化数据

                       Android 个人理财工具一：项目概述与启动界面的实现

       以上就Android 开发个人理财工具 添加账单页面的讲解,后续继续更新相应文章,谢谢大家对本站的支持！