Android technology-database (III): SQLite database application instance, androidsqlite

Android technology-database (III): SQLite database application instance, androidsqlite

For the source code of this article, see: https://github.com/YongYuIT/MeiNvLiuLanQi

The example in this article is based on the project added in "Android system review (8): Network Communication (1.

The effect is: In PostActivity, when the beauty is loaded, their information is asynchronously written into the database.

/MeiNvLiuLanQi/src/com/example/meinvliulanqi/basic_service/IDBOperate. java file:

Package com. example. meinvliulanqi. basic_service;
Import android. database. sqlite. SQLiteDatabase;
Public interface IDBOperate
{
Public boolean doOperate (SQLiteDatabase db );
Public void onDBOpreaterFinished (Boolean result );
}

/MeiNvLiuLanQi/src/com/example/meinvliulanqi/basic_service/MeinvDbHelper. java file:

Package com. example. meinvliulanqi. basic_service;
Import android. content. Context;
Import android. database. sqlite. SQLiteDatabase;
Import android. database. sqlite. SQLiteOpenHelper;
Public class MeinvDbHelper extends SQLiteOpenHelper
{
// Basic database Parameters
Public static final String DB_NAME = "meinvDB. db ";
//--------------------------------------------------------------
// Basic description of the data table, table name and column name in the table
Public static final String DB_TABLE_MEINV_INFO = "tab_meinv_info ";
Public static final String KEY_ID = "id ";
Public static final String KEY_HEAD_PATH = "head_path ";
Public static final String KEY_NAME = "name ";
Public static final String KEY_BIRTHDAY = "birthday ";
Public static final String KEY_ADDRESS = "address ";
Public static final String KEY_STATURE = "stature ";
Public static final String KEY_WEIGHT = "weight ";
Public static final String KEY_BUST = "bust ";
Public static final String KEY_WAISTLINE = "waistline ";
Public static final String KEY_HIP = "hip ";
//--------------------------------------------------------------
// SQL statement used to create a database
Private static final String DATABASE_CREATE = String. format (
"Create table % s (% s integer primary key autoincrement, % s text not null, % s float not null, % s float not null, % s text not null, % s float not null, % s float not null )",
DB_TABLE_MEINV_INFO,
KEY_ID,
KEY_HEAD_PATH,
KEY_NAME,
KEY_BIRTHDAY,
KEY_ADDRESS,
KEY_STATURE,
KEY_WEIGHT,
KEY_BUST,
KEY_WAISTLINE,
KEY_HIP );
// Define the constructor
Public MeinvDbHelper (Context context, int version)
{
// SQLiteOpenHelper (Context context, String name, CursorFactory factory,
// Int version)
// The first parameter: Create the context of the database. For example, if com. example. meinvliulanqi. ui. the actual storage location of the database file in the user's mobile phone is/data/com. example. meinvliulanqi. ui/databases
// The second parameter: name of the database to be created. For example, the name is meinvDB. after the database is successfully created,/data/com. example. meinvliulanqi. meinvDB is available in the ui/databases path. db, meinvDB. db-journal files: database files and log files
// The third and fourth parameters: CursorFactory is used to generate the Cursor object. version is the version used to create the database.
Super (context, DB_NAME, null, version );
}
// Rewrite the onCreate function to create a new database when no database exists on the disk.
@ Override
Public void onCreate (SQLiteDatabase arg0)
{
Arg0.execSQL (DATABASE_CREATE );
}
// Rewrite the onUpgrade function. If the database version is inconsistent, upgrade the database on the disk to the current version. This may happen after overwriting and installation.
@ Override
Public void onUpgrade (SQLiteDatabase arg0, int arg1, int arg2)
{
Arg0.execSQL ("drop table if exist" + DB_TABLE_MEINV_INFO );
OnCreate (arg0 );
}
}

/MeiNvLiuLanQi/src/com/example/meinvliulanqi/basic_service/Task_operate_db.java file:

Package com. example. meinvliulanqi. basic_service;
Import android. content. Context;
Import android. database. sqlite. SQLiteDatabase;
Import android. OS. AsyncTask;
Import android. util. Log;
Public class Task_operate_db extends AsyncTask <Void, Integer, Boolean>
{
Private Context context;
Private int db_version;
Private IDBOperate operate;
Public Task_operate_db (Context _ con, int _ ver, IDBOperate _ ope)
{
Context = _ con;
Db_version = _ ver;
Operate = _ ope;
}
@ Override
Protected Boolean doInBackground (Void... para)
{
MeinvDbHelper helper = new MeinvDbHelper (context, db_version );
SQLiteDatabase db = null;
Try
{
Db = helper. getWritableDatabase ();
Return operate. doOperate (db );
} Catch (Exception e)
{
Log. e ("thinking -------", e. getMessage ());
Return false;
}
}
@ Override
Protected void onProgressUpdate (Integer... values)
{
}
@ Override
Protected void onPostExecute (Boolean result)
{
This. operate. onDBOpreaterFinished (result );
}
}

/MeiNvLiuLanQi/src/com/example/meinvliulanqi/ui/PostActivity. java file:

Package com. example. meinvliulanqi. ui;
Import org. json. JSONArray;
Import org. json. JSONException;
Import com. example. meinvliulanqi. basic_service.IDBOperate;
Import com. example. meinvliulanqi. basic_service.IGetdata;
Import com. example. meinvliulanqi. basic_service.MeinvDbHelper;
Import com. example. meinvliulanqi. basic_service.Task_getimgs;
Import com. example. meinvliulanqi. basic_service.Task_operate_db;
Import com. example. meinvliulanqi. basic_service.Task_postdata;
Import android. app. Activity;
Import android. content. ContentValues;
Import android. database. Cursor;
Import android. database. sqlite. SQLiteDatabase;
Import android. graphics. Bitmap;
Import android. OS. Bundle;
Import android. util. Log;
Import android. widget. GridView;
Public class PostActivity extends Activity implements IGetdata, IDBOperate
{
Private MeinvBaseAdapter ada;
Private GridView gid_meinv;
Private JSONArray meinvs;
@ Override
Protected void onCreate (Bundle savedInstanceState)
{
Super. onCreate (savedInstanceState );
SetContentView (R. layout. activity_post );
Task_postdata task = new Task_postdata (this );
Task.exe cute (new String [] {
"Http: // 192.168.10.111: 8011/MeinvInfo. ashx ",
"{\" Method \ ": \" get_meinv \ ", \" check_num \ ": 1001 }"});
}
@ Override
Public void onGetInfoData (String info)
{
Try
{
Meinvs = new JSONArray (info );
InitUIInfo ();
} Catch (JSONException e)
{
Log. e ("thinking -------", e. getMessage ());
}
}
Private void initUIInfo ()
{
Gid_meinv = (GridView) findViewById (R. id. gid_meinv_post );
Ada = new MeinvBaseAdapter (meinvs, new Bitmap [meinvs. length ()], this );
Gid_meinv.setAdapter (ada );
String [] [] img_infos = new String [meinvs. length ()] [2];
For (int I = 0; I {
Try
{
Img_infos [I] [0] = meinvs. getJSONObject (I)
. GetString ("photoPath ");
} Catch (JSONException e)
{
Img_infos [I] [0] = "";
Log. e ("thinking -------", e. getMessage ());
}
Img_infos [I] [1] = I + "";
}
Task_getimgs task = new Task_getimgs (this );
Task.exe cute (img_infos );
Task_operate_db task_db = new Task_operate_db (this, 1, this );
Task_db.execute ();
}
@ Override
Public void onGetImgData (Bitmap [] img)
{
Ada. setImgs (img );
}
@ Override
Public boolean doOperate (SQLiteDatabase db)
{
Try
{
ContentValues newValues = new ContentValues ();
For (int I = 0; I <meinvs. length (); I ++)
{
NewValues. put (MeinvDbHelper. KEY_NAME, meinvs. getJSONObject (I)
. GetString ("name "));
NewValues. put (MeinvDbHelper. KEY_ADDRESS, meinvs
. GetJSONObject (I). getString ("address "));
NewValues. put (MeinvDbHelper. KEY_HEAD_PATH,
"/Sdcard/meinvliulanqi/" + I + ". jpg ");
NewValues. put (MeinvDbHelper. KEY_BUST, meinvs. getJSONObject (I)
. GetString ("bust "));
NewValues. put (MeinvDbHelper. KEY_HIP, meinvs. getJSONObject (I)
. GetDouble ("hip "));
NewValues. put (MeinvDbHelper. KEY_BIRTHDAY,
Meinvs. getJSONObject (I). getString ("birthday "));
NewValues. put (MeinvDbHelper. KEY_STATURE, meinvs
. GetJSONObject (I). getDouble ("stature "));
NewValues. put (MeinvDbHelper. KEY_WEIGHT, meinvs. getJSONObject (I)
. GetDouble ("weight "));
NewValues. put (MeinvDbHelper. KEY_WAISTLINE, meinvs
. GetJSONObject (I). getDouble ("waistline "));
Db. insert (MeinvDbHelper. DB_TABLE_MEINV_INFO, null, newValues );
}
Return true;
} Catch (Exception e)
{
Log. e ("thinking -------", e. getMessage ());
Return false;
}
}
@ Override
Public void onDBOpreaterFinished (Boolean result)
{
// TODO Auto-generated method stub
}
}

Implementation results:

After the page is loaded, adb can be viewed in the/data/com. example. meinvliulanqi. ui/databases path:

Copy the meinvDB. db file and use the Sqlite3 tool to view the file:

The result indicates that the data has been written to the database.