实例三

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.

 

表结构就是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

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。

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

//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

//
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"); } }