4.19成果（冲刺1.2）

预期任务量：40h；目前已花时间：4h；剩余时间：33h。

 做了一个标签栏：

 遇到问题：点击标题栏按钮会发生变化，但是页面跳转有问题。

SQLite数据库：

package com.example.zbytexttwo;

import android.content.Context;
import android.database.sqlite.SQLiteDatabase;
import android.database.sqlite.SQLiteDatabase.CursorFactory;
import android.database.sqlite.SQLiteOpenHelper;

public class dbHelper extends SQLiteOpenHelper {
    public static final String TB_NAME = "bills";
    public dbHelper(Context context, String name, CursorFactory factory, int version) {
        super(context, name, factory, version);
        // TODO Auto-generated constructor stub
    }
    @Override
    public void onCreate(SQLiteDatabase db) {
        // TODO Auto-generated method stub
        db.execSQL("CREATE TABLE IF NOT EXISTS " +
                TB_NAME + " ( _id integer primary key autoincrement," +
                "leixing varchar," +
                "riqi varchar,"+
                "jine integer," +
                "beizhu varchar"+
                ") ");
    }
    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        // TODO Auto-generated method stub
        db.execSQL("DROP TABLE IF EXISTS " + TB_NAME);
        onCreate(db);
    }
}