1.创建数据库的方法:

public void onCreate(SQLiteDatabase db)

{

String sql = "CREATE TABLE[calendar]("

+"[_id] INTEGER PRIMARY KEY AUTOINCREMENT,"

+"[text] text"+")";

db.execSQL(sql);

}

这样对齐看起来很方便.

2.查询数据库

public Cursor query(String sql ,String[]args)

{

SQLiteDatabase db = this.getReadableDatabase();

Cursor cursor = db.rawQuery(sql,args);

return cursor;

}

3.执行INSERT UPDATE DELETE等SQL语句的函数:

public void execSQL(String sql,Object[]args)

{

SQLiteDatabase db = this.getWritableDatabase();

db.execSQL(sql,args);

}

4.SimpleCursorAdapter的使用:

SimpleCursorAdapter simpleCursorAdapter

= new SimpleCursorAdapter(this,android.R.layout.simple_list_item_checked,

myCursor,new String[]{"text"},new int[]{android.R.id.text1} );

myListView.setAdapter(simpleCursorAdapter);

其中android.R.layout.simple_list_item_checked为自带的:<?xml version="1.0" encoding="utf-8"?>

android:id="@android:id/text1"

android:layout_width="match_parent"

android:layout_height="?android:attr/listPreferredItemHeight"

android:textAppearance="?android:attr/textAppearanceLarge"

android:gravity="center_vertical"

android:checkMark="?android:attr/textCheckMark"

android:paddingLeft="6dip"

android:paddingRight="6dip"

/>

5.add,edit,delete的函数编写:

private void add()

{

if(myEditText.getText().toString().equals(""))

return ;

String sql = "INSERT INTO calendar(text)VALUES(?)";

String value = myEditText.getText().toString();

myDBService.execSQL(sql,new Object[]{value});

myCursor.requery();

myListView.invalidateViews();

myEditText.setText("");

_id=0;

}

private void edit()

{

if(myEditText.getText().toString().equals(""))

return ;

String sql = "UPDATE calendar SET text= ? WHERE _id=?";

String value1 = myEditText.getText().toString();

String value2 = Integer.toString(_id);

myDBService.execSQL(sql,new Object[]{value1,value2});

myCursor.requery();

myListView.invalidateViews();

myEditText.setText("");

_id=0;

}

private void delete()

{

if(_id==0)

return ;

String sql = "DELETE FROM calendar WHERE _id = ?";

String value = Integer.toString(_id);

myDBService.execSQL(sql,new Object[]{value});

myCursor.requery();

myListView.invalidateViews();

myEditText.setText("");

_id=0;

}

}

6.ListView相关:

myListView.setOnItemClickListener(new AdapterView.OnItemClickListener()

{

@Override

public void onItemClick(AdapterView> parent, View view,

int position, long id)

{

myCursor.moveToPosition(position);

_id = myCursor.getInt(0);

myEditText.setText(myCursor.getString(1));

}

});

myListView.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener()

{

@Override

public void onItemSelected(AdapterView> parent, View view,

int position, long id)

{

SQLiteCursor sc = (SQLiteCursor)parent.getSelectedItem();

_id = sc.getInt(0);

myEditText.setText(sc.getString(1));

}

@Override

public void onNothingSelected(AdapterView> parent)

{

}

});