Android轻量数据库

SQLite

创建数据库

final SQLiteDatabase db = openOrCreateDatabase("graphicsCard", Context.MODE_PRIVATE,null);
String create = "create table if not exists graphicsCard(id integer primary key autoincrement,name text not null,price integer not null);";
db.execSQL(create);

id	name	price
*	*	*

增加数据

final ContentValues in = new ContentValues();
in.put("name", "GTX1080 ti");
in.put("price", 8299);
db.insert("graphicsCard", null, in);

in.put("name", "GTX1080");
in.put("price", 4799);
db.insert("graphicsCard", null, in);

id	name	price
1	GTX1080 ti	8299
2	GTX1080	4799

查

int price = Integer.parseInt(et_search.getText()+"");
String search = "select * from graphicsCard where price = "+price;
Cursor cursor = db.rawQuery(search,null);
String str = null;
if(cursor.moveToNext()){
    str = cursor.getString(cursor.getColumnIndex("id"))+"  "
    +cursor.getString(cursor.getColumnIndex("name"))+"  "
    +cursor.getInt(cursor.getColumnIndex("price"));
  }
cursor.close();

关闭

db.close();

SharedPreferences

创建

SharedPreferences sp;
sp = getSharedPreferences("save", Activity.MODE_PRIVATE);
boolean isFirst = sp.getBoolean("save",true);

置

SharedPreferences.Editor editor = sp.edit();
isFirst = false;
editor.putBoolean("save",isFirst);
editor.commit();