sqlite的gps數據

Question

我想知道如何在包含gps數據（緯度，經度）的sqlite中創建數據庫，然後從數據庫中檢索以在地圖上顯示數據？

請我需要它迫切

感謝

Answer 1

public class DBAdapter{ 
public static final String KEY_ROWID = "_id"; 
public static final String KEY_latitude = "latitude"; 
public static final String KEY_longitude = "longitude"; 
      Cursor cur=null; 

private static final String DATABASE_NAME = "MyDB.sqlite"; 
private static final String DATABASE_TABLE = "gpsCordinates"; 
private static final int DATABASE_VERSION = 1; 

private static final String DATABASE_CREATE = 
     "create table gpsCordinates(_id integer primary key autoincrement," 
+ "latitude text not null, longitude text not null);"; 

private final Context context; 

private DatabaseHelper DBHelper; 
private SQLiteDatabase db; 

public DBAdapter (Context ctx){ 
    this.context = ctx; 
    DBHelper = new DatabaseHelper(context); 
} 

private static class DatabaseHelper extends SQLiteOpenHelper{ 
    DatabaseHelper (Context context) 
    { 
     super(context, DATABASE_NAME, null, DATABASE_VERSION); 
    } 

    @Override 
    public void onCreate(SQLiteDatabase db) { 
     // TODO Auto-generated method stub 
     try{ 
      db.execSQL(DATABASE_CREATE); 
     } 
     catch (SQLException e){ 
      e.printStackTrace(); 
     } 

    } 

    @Override 
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) { 
    Log.w(TAG,"Upgrading database from version" 
     +oldVersion + " to " +newVersion + ", This will remove all previous data"); 
     db.execSQL("Drop TABLE IF EXISTS"); 
     onCreate(db); 
    } 
} 

public DBAdapter open() throws SQLException { 
    db = DBHelper.getWritableDatabase(); 
    return this; 

} 

public DBAdapter openReadable() throws SQLException { 
    db = DBHelper.getReadableDatabase(); 
    return this; 

} 

public void close(){ 
    DBHelper.close(); 
} 
//*-- inserts a new contact into database --*// 
public long insertContact(String latitudE, String longitudE){ 
    ContentValues initialValues = new ContentValues(); 
    initialValues.put(KEY_latitude, latitudE); 
    initialValues.put(KEY_longitude, longitudE); 
    return db.insert(DATABASE_TABLE, null, initialValues); 

} 

public Cursor retrieveRecord(){ 
    cur= db.rawQuery("YOUR SQL QUERY", null); 
    return cur; 
} 

這應該創建數據庫的照顧。使用光標檢索您的值。