Android增高第九篇之GridView和SQLite实现分页表格

<?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);  
    }  
}