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SQlite.GridView

时间:2021-07-01 10:21:17 帮助过:20人阅读

com.testSQLite; import android.annotation.SuppressLint; 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"; @SuppressLint("ShowToast") @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) {} } } }

  2.2、GVTable.java

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.util.Log;
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>> alistPageID, alistTable;// 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
        addView(gvTable, new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));//宽长式样
        
        alistTable = new ArrayList<HashMap<String, String>>();
        saTable = new SimpleAdapter(context,
                alistTable,// 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<?> _parent, View _view, int _position, long _id)
            {
                int y = _position / curTable.getColumnCount() - 1;//标题栏的不算
                int x = _position % 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
        addView(gvPage, new LinearLayout.LayoutParams(LayoutParams.MATCH_PARENT, LayoutParams.WRAP_CONTENT));//宽长式样
        alistPageID = new ArrayList<HashMap<String, String>>();
        saPageID = new SimpleAdapter(context,
                alistPageID,// 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<?> _parent, View _view, int _position, long _id)
            {
                LoadTable(_position);//根据所选分页读取对应的数据
                if(switchListener!=null)//分页切换时
                {
                    switchListener.onPageSwitchListener(_position, alistPageID.size());
                }
            }
        });
    }

    /**
     * 清除所有数据
     */
    public void gvRemoveAll()
    {
        if(this.curTable!=null)
            curTable.close();
        alistTable.clear();
        saTable.notifyDataSetChanged();
    
        alistPageID.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);
        Log.e("sql", sql);
        curTable = db.rawQuery(sql, null);
        
        gvTable.setNumColumns(curTable.getColumnCount());//表现为表格的关键点!
        TableColCount=curTable.getColumnCount();
        alistTable.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));
            alistTable.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));
                alistTable.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
        
        alistPageID.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

            alistPageID.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);
    }
}

  2.3、main.xml

<?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 
        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 
        android:layout_height="wrap_content"
        android:layout_width="fill_parent" 
        android:id="@+id/btnClose"
        android:text="关闭数据库" />

</LinearLayout>

  2.4、items.xml

<?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>

 

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SQlite.GridView

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