Android提高之SQLite分页表格实现方法

<?xml version="1.0" encoding="utf-8"?><LinearLayout android:id="@+id/LinearLayout01" xmlns:android="http://schemas.android.com/apk/res/android" android:layout_width="fill_parent" android:background="#555555" android:layout_height="wrap_content"> <TextView android:layout_below="@+id/ItemImage" android:text="TextView01" android:id="@+id/ItemText" android:bufferType="normal" android:singleLine="true" android:background="#000000" android:layout_width="fill_parent" android:gravity="center" android:layout_margin="1dip" android:layout_gravity="center" android:layout_height="wrap_content"> </TextView></LinearLayout>

<?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>

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) {  } } }}

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); }}