这个SQL分页表格控件主要分为“表格区”和“分页栏”这两部分,这两部分都是基于GridView实现的。网上介绍Android上实现表格的DEMO一般都用ListView。ListView与GridView对比,ListView最大的优势是格单元的大小可以自定义,可以某单元长某单元短,但是难于实现自适应数据表的结构;而GridView最大的优势就是自适应数据表的结构,但是格单元统一大小。。。对于数据表结构多变的情况,建议使用GridView实现表格。
本文实现的SQL分页表格控件有以下特点:
1.自适应数据表结构,但是格单元统一大小;
2.支持分页;
3.“表格区”有按键事件回调处理,“分页栏”有分页切换事件回调处理。
items.xml的代码如下,它是“表格区”和“分页栏”的格单元实现:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:id="@+id/LinearLayout01" android:layout_width="fill_parent" android:layout_height="wrap_content" android:background="#555555" > <TextView android:id="@+id/ItemText" android:layout_width="fill_parent" android:layout_height="wrap_content" android:layout_gravity="center" android:layout_margin="1dip" android:background="#000000" android:bufferType="normal" android:gravity="center" android:singleLine="true" android:text="TextView01" > </TextView> </LinearLayout>main.xml的代码如下:
<?xml version="1.0" encoding="utf-8"?> <LinearLayout xmlns:android="http://schemas.android.com/apk/res/android" android:orientation="vertical" android:layout_width="fill_parent" android:layout_height="fill_parent" android:id="@+id/MainLinearLayout"> <Button android:layout_height="wrap_content" android:layout_width="fill_parent" android:id="@+id/btnCreateDB" android:text="创建数据库"></Button> <Button android:layout_height="wrap_content" android:layout_width="fill_parent" android:text="插入一串实验数据" android:id="@+id/btnInsertRec"></Button> <Button android:layout_height="wrap_content" android:id="@+id/btnClose" android:text="关闭数据库" android:layout_width="fill_parent"></Button> </LinearLayout>演示程序testSQLite.java的源码:
package com.testSQLite; import android.app.Activity; import android.database.Cursor; import android.database.SQLException; import android.database.sqlite.SQLiteDatabase; import android.os.Bundle; import android.util.Log; import android.view.View; import android.widget.Button; import android.widget.LinearLayout; import android.widget.Toast; public class testSQLite extends Activity { GVTable table; Button btnCreateDB, btnInsert, btnClose; SQLiteDatabase db; int id;//添加记录时的id累加标记,必须全局 private static final String TABLE_NAME = "stu"; private static final String ID = "id"; private static final String NAME = "name"; private static final String PHONE = "phone"; private static final String ADDRESS = "address"; private static final String AGE = "age"; @Override public void onCreate(Bundle savedInstanceState) { super.onCreate(savedInstanceState); setContentView(R.layout.main); btnCreateDB = (Button) this.findViewById(R.id.btnCreateDB); btnCreateDB.setOnClickListener(new ClickEvent()); btnInsert = (Button) this.findViewById(R.id.btnInsertRec); btnInsert.setOnClickListener(new ClickEvent()); btnClose = (Button) this.findViewById(R.id.btnClose); btnClose.setOnClickListener(new ClickEvent()); table=new GVTable(this); table.gvSetTableRowCount(8);//设置每个分页的ROW总数 LinearLayout ly = (LinearLayout) findViewById(R.id.MainLinearLayout); table.setTableOnClickListener(new GVTable.OnTableClickListener() { @Override public void onTableClickListener(int x,int y,Cursor c) { c.moveToPosition(y); String str=c.getString(x)+" 位置:("+String.valueOf(x)+","+String.valueOf(y)+")"; Toast.makeText(testSQLite.this, str, 1000).show(); } }); table.setOnPageSwitchListener(new GVTable.OnPageSwitchListener() { @Override public void onPageSwitchListener(int pageID,int pageCount) { String str="共有"+String.valueOf(pageCount)+ " 当前第"+String.valueOf(pageID)+"页"; Toast.makeText(testSQLite.this, str, 1000).show(); } }); ly.addView(table); } class ClickEvent implements View.OnClickListener { @Override public void onClick(View v) { if (v == btnCreateDB) { CreateDB(); } else if (v == btnInsert) { InsertRecord(16);//插入16条记录 table.gvUpdatePageBar("select count(*) from " + TABLE_NAME,db); table.gvReadyTable("select * from " + TABLE_NAME,db); }else if (v == btnClose) { table.gvRemoveAll(); db.close(); } } } /** * 在内存创建数据库和数据表 */ void CreateDB() { // 在内存创建数据库 db = SQLiteDatabase.create(null); Log.e("DB Path", db.getPath()); String amount = String.valueOf(databaseList().length); Log.e("DB amount", amount); // 创建数据表 String sql = "CREATE TABLE " + TABLE_NAME + " (" + ID + " text not null, " + NAME + " text not null," + ADDRESS + " text not null, " + PHONE + " text not null," + AGE + " text not null "+");"; try { db.execSQL("DROP TABLE IF EXISTS " + TABLE_NAME); db.execSQL(sql); } catch (SQLException e) {} } /** * 插入N条数据 */ void InsertRecord(int n) { int total = id + n; for (; id < total; id++) { String sql = "insert into " + TABLE_NAME + " (" + ID + ", " + NAME+", " + ADDRESS+", " + PHONE+", "+AGE + ") values('" + String.valueOf(id) + "', 'man','address','123456789','18');"; try { db.execSQL(sql); } catch (SQLException e) { } } } }分页表格控件GVTable.java的源码:
package com.testSQLite; import java.util.ArrayList; import java.util.HashMap; import android.content.Context; import android.database.Cursor; import android.database.sqlite.SQLiteDatabase; import android.view.View; import android.widget.AdapterView; import android.widget.GridView; import android.widget.LinearLayout; import android.widget.SimpleAdapter; import android.widget.AdapterView.OnItemClickListener; public class GVTable extends LinearLayout { protected GridView gvTable,gvPage; protected SimpleAdapter saPageID,saTable;// 适配器 protected ArrayList<HashMap<String, String>> srcPageID,srcTable;// 数据源 protected int TableRowCount=10;//分页时,每页的Row总数 protected int TableColCount=0;//每页col的数量 protected SQLiteDatabase db; protected String rawSQL=""; protected Cursor curTable;//分页时使用的Cursor protected OnTableClickListener clickListener;//整个分页控件被点击时的回调函数 protected OnPageSwitchListener switchListener;//分页切换时的回调函数 public GVTable(Context context) { super(context); this.setOrientation(VERTICAL);//垂直 //---------------------------------------- gvTable=new GridView(context); addView(gvTable, new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));//宽长式样 srcTable = new ArrayList<HashMap<String, String>>(); saTable = new SimpleAdapter(context, srcTable,// 数据来源 R.layout.items,//XML实现 new String[] { "ItemText" },// 动态数组与ImageItem对应的子项 new int[] { R.id.ItemText }); // 添加并且显示 gvTable.setAdapter(saTable); gvTable.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { int y=arg2/curTable.getColumnCount()-1;//标题栏的不算 int x=arg2 % curTable.getColumnCount(); if (clickListener != null//分页数据被点击 && y!=-1) {//点中的不是标题栏时 clickListener.onTableClickListener(x,y,curTable); } } }); //---------------------------------------- gvPage=new GridView(context); gvPage.setColumnWidth(40);//设置每个分页按钮的宽度 gvPage.setNumColumns(GridView.AUTO_FIT);//分页按钮数量自动设置 addView(gvPage, new LinearLayout.LayoutParams(LayoutParams.FILL_PARENT, LayoutParams.WRAP_CONTENT));//宽长式样 srcPageID = new ArrayList<HashMap<String, String>>(); saPageID = new SimpleAdapter(context, srcPageID,// 数据来源 R.layout.items,//XML实现 new String[] { "ItemText" },// 动态数组与ImageItem对应的子项 new int[] { R.id.ItemText }); // 添加并且显示 gvPage.setAdapter(saPageID); // 添加消息处理 gvPage.setOnItemClickListener(new OnItemClickListener(){ @Override public void onItemClick(AdapterView<?> arg0, View arg1, int arg2, long arg3) { LoadTable(arg2);//根据所选分页读取对应的数据 if(switchListener!=null){//分页切换时 switchListener.onPageSwitchListener(arg2,srcPageID.size()); } } }); } /** * 清除所有数据 */ public void gvRemoveAll() { if(this.curTable!=null) curTable.close(); srcTable.clear(); saTable.notifyDataSetChanged(); srcPageID.clear(); saPageID.notifyDataSetChanged(); } /** * 读取指定ID的分页数据,返回当前页的总数据 * SQL:Select * From TABLE_NAME Limit 9 Offset 10; * 表示从TABLE_NAME表获取数据,跳过10行,取9行 * @param pageID 指定的分页ID */ protected void LoadTable(int pageID) { if(curTable!=null)//释放上次的数据 curTable.close(); String sql= rawSQL+" Limit "+String.valueOf(TableRowCount)+ " Offset " +String.valueOf(pageID*TableRowCount); curTable = db.rawQuery(sql, null); gvTable.setNumColumns(curTable.getColumnCount());//表现为表格的关键点! TableColCount=curTable.getColumnCount(); srcTable.clear(); // 取得字段名称 int colCount = curTable.getColumnCount(); for (int i = 0; i < colCount; i++) { HashMap<String, String> map = new HashMap<String, String>(); map.put("ItemText", curTable.getColumnName(i)); srcTable.add(map); } // 列举出所有数据 int recCount=curTable.getCount(); for (int i = 0; i < recCount; i++) {//定位到一条数据 curTable.moveToPosition(i); for(int ii=0;ii<colCount;ii++)//定位到一条数据中的每个字段 { HashMap<String, String> map = new HashMap<String, String>(); map.put("ItemText", curTable.getString(ii)); srcTable.add(map); } } saTable.notifyDataSetChanged(); } /** * 设置表格的最多显示的行数 * @param row 表格的行数 */ public void gvSetTableRowCount(int row) { TableRowCount=row; } /** * 取得表格的最大行数 * @return 行数 */ public int gvGetTableRowCount() { return TableRowCount; } /** * 取得当前分页的Cursor * @return 当前分页的Cursor */ public Cursor gvGetCurrentTable() { return curTable; } /** * 准备分页显示数据 * @param rawSQL sql语句 * @param db 数据库 */ public void gvReadyTable(String rawSQL,SQLiteDatabase db) { this.rawSQL=rawSQL; this.db=db; } /** * 刷新分页栏,更新按钮数量 * @param sql SQL语句 * @param db 数据库 */ public void gvUpdatePageBar(String sql,SQLiteDatabase db) { Cursor rec = db.rawQuery(sql, null); rec.moveToLast(); long recSize=rec.getLong(0);//取得总数 rec.close(); int pageNum=(int)(recSize/TableRowCount) + 1;//取得分页数 srcPageID.clear(); for (int i = 0; i < pageNum; i++) { HashMap<String, String> map = new HashMap<String, String>(); map.put("ItemText", "No." + String.valueOf(i));// 添加图像资源的ID srcPageID.add(map); } saPageID.notifyDataSetChanged(); } //--------------------------------------------------------- /** * 表格被点击时的回调函数 */ public void setTableOnClickListener(OnTableClickListener click) { this.clickListener = click; } public interface OnTableClickListener { public void onTableClickListener(int x,int y,Cursor c); } //--------------------------------------------------------- /** * 分页栏被点击时的回调函数 */ public void setOnPageSwitchListener(OnPageSwitchListener pageSwitch) { this.switchListener = pageSwitch; } public interface OnPageSwitchListener { public void onPageSwitchListener(int pageID,int pageCount); } }来源于:http://blog.csdn.net/hellogv/article/details/6019301
源码:http://download.csdn.net/detail/gg137608987/5078144