如何从SQLite对android进行排序？

Question

我需要显示多个数据库表来分隔文字浏览。

，所以我需要从表中把所有“约会”和排序他们在MainActivity如txtMonday，txtTuesday，txtWednesday

数据库设计白天存储与其他一起在单独textviews显示细节：

private static final String DATABASE_CREATE = 
     "create table " + TABLE_AP + "(" + COLUMN_ID + " integer primary key autoincrement, " 
     + COLUMN_DAY + " text not null, " 
     + COLUMN_TIME + " text not null, " 
     + COLUMN_DURATION + " text not null, " 
     + COLUMN_DESCRIPTION + " text not null);"; 

这是我试图通过MainActivity调用它： （我也将用的onCreate调用它）

public void onResume(){ 
     APData = new AppointmentDataSource(this); 
     APData.open(); 
     List<Appointment> appointments = APData.retrieveAllAppointments(); 
     APData.close(); 

AppointmentDataSource：

public List<Appointment> retrieveAllAppointments() { 
    List<Appointment> appointments = new ArrayList<Appointment>(); 

    Cursor cursor = database.query(MySQLiteHelper.TABLE_AP, , null, null, null, null, null); 

    cursor.moveToFirst(); 


    while (!cursor.isAfterLast()) { 
     Appointment ap = cursorToBk(cursor); 
     appointments.add(ap); 
     cursor.moveToNext(); 
    } 

    cursor.close(); 
    return appointments;   
} 

也为天，我用单选按钮之间进行选择周一/周二/周三/周四/周五 ，所以我白天存储与：

createButton.setOnClickListener(new View.OnClickListener() { 

     @Override 
     public void onClick(View view) { 
     findRadioGroup = (RadioGroup) findViewById(R.id.radioDay); 
     int selectedId = findRadioGroup.getCheckedRadioButtonId(); 
     radioButton = (RadioButton) findViewById(selectedId); 


     String day=radioButton.getText().toString(); 
     String time=txtTime.getText().toString(); 
     String duration=txtDuration.getText().toString(); 
     String description=txtDescription.getText().toString(); 

     APData.insert(day, time, duration, description); 
     APData.close(); 
     finish(); 
     } 

    }); 

和XML他们/字符串：

<string name="RadioMon">Mon</string> 
<string name="RadioTue">Tue</string> 
<string name="RadioWed">Wed</string> 
<string name="RadioThu">Thur</string> 
<string name="RadioFri">Fri</string> 

Answer 1

在你的数据模型，你应该有一个操纵约会一类，所以当你检索所有约会从数据库中仅仅根据您的Appointment类的创建方式，将它们过滤为appointments[i].Day或类似的东西。你不需要为它们中的每一个明确地创建不同的数据库选择。

public void onResume(){ 
    APData = new AppointmentDataSource(this); 
    APData.open(); 
    List<Appointment> appointments = APData.retrieveAllAppointments(); 
    APData.close(); 
    TextView tvMonday = (TextView)findViewById(R.id.tvMonday); 
    TextView tvTuesday = (TextView)findViewById(R.id.tvTuesday); 
    ... (all your days textViews). 
    for(Iterator<Appointment> i = appointments.iterator(); i.hasNext();){ 
    Appointment item = i.next(); 
    if(item.Day.equals("Monday") tvMonday.append(item.ToString()); 
    //same for the rest of your textViews 
    } 

应该是这样的。