在 SQLite 中存储 Android 标记时出错

Question

我正在尝试在 SQLite 数据库中保存位置并在地图上放置标记。但我收到以下错误：

FATAL EXCEPTION: main Process: com.example.android.myfavplaces, PID: 2354 java.lang.RuntimeException: Unable to start activity ComponentInfo{com.example.android.myfavplaces/com.example.android.myfavplaces.MapsActivity}: android.database.sqlite.SQLiteException: AUTOINCREMENT is only allowed on an INTEGER PRIMARY KEY (code 1): , while compiling: create table locations(loc_idinteger primary key autoincrement, loc_latdouble , loc_lngdouble ,loc_postext);

这是我的代码：

public class LocationsSQLHelper extends SQLiteOpenHelper {

    private SQLiteDatabase mDB;
    public static final String DATABASE_NAME = "MyDBName.db";
    private static final String TABLE_NAME="locations";

    private static final String FIELD_ROW_ID="loc_id";
    private static final String FIELD_LAT="loc_lat";
    private static final String FIELD_LNG="loc_lng";
    private static final String FIELD_ZOOM="loc_pos";

    private static final int D_VERSION=1;

    private static final String DB_NAME="markerlocations.db";
    private static final String DB_CREATE="create table "+TABLE_NAME+ "("
                            +FIELD_ROW_ID + "integer primary key autoincrement, "
                            +FIELD_LAT + "double , "
                            +FIELD_LNG + "double ,"
                            +FIELD_ZOOM + "text"
                            +");"
                    ;


        public LocationsSQLHelper(Context context) {
        super(context, DB_NAME, null, D_VERSION);

        }

    @Override
        public void onCreate(SQLiteDatabase db) {
        db.execSQL(DB_CREATE);
    }


    /** Inserts a new location to the table locations */
    public boolean insert(Integer id, Double lat, Double lon, String zoom) {
     SQLiteDatabase db=this.getWritableDatabase();
        ContentValues contentValues=new ContentValues();
        contentValues.put("id", id);
        contentValues.put("lat", 12.944400 );
        contentValues.put("lon", 75.785966);
        contentValues.put(zoom,"zoom");
        return true;
    }

    /** Deletes all locations from the table */
    public long del(Integer id){
        SQLiteDatabase db = this.getWritableDatabase();
        return db.delete("locations",
                "id = ? ",
                new String[] { Long.toString(id) });
    }

    public ArrayList<String> getAllLocations(){
    ArrayList<String> arrayList=new ArrayList<>();
            SQLiteDatabase db=this.getReadableDatabase();
        Cursor res=db.rawQuery("select * from locations", null );
        res.moveToFirst();
        while(res.isAfterLast() == false){
            arrayList.add(res.getString(res.getColumnIndex(FIELD_ROW_ID)));
            res.moveToNext();
        }
        return arrayList;
    }

    @Override
    public void onUpgrade(SQLiteDatabase db, int oldVersion, int newVersion) {
        db.execSQL("DROP TABLE IF EXISTS" + TABLE_NAME);
        onCreate(db);
    }


}

Answer 1

在"integer primary key"、"double..."和“正文”前加一个space如下：

+FIELD_ROW_ID + " integer primary key autoincrement, " +FIELD_LAT + " double , " +FIELD_LNG + " double ," +FIELD_ZOOM + " text" +");"

请注意 " 符号之后和整数、双精度和文本之前的 space。

在 SQLite 中存储 Android 标记时出错

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java

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android

google-maps

google-maps-markers