Question

我有一个方法可以获取SQLite表中的所有值。该应用程序使用SQLite。现在，我想在旋转器中加载这些数据。我该怎么做？

public List<Outlet> getAllOutlet(){

    List<Outlet> outletlist = new ArrayList<>();
    // Select All Query
    String selectQuery = "SELECT  * FROM " + TABLE_OUTLET;

    SQLiteDatabase db = this.getWritableDatabase();
    Cursor cursor = db.rawQuery(selectQuery, null);

    // looping through all rows and adding to list
    if (cursor.moveToFirst()) {
        do {
            Outlet outlet = new Outlet();
            outlet.setOID(Integer.parseInt(cursor.getString(1)));
            outlet.setOutletname((cursor.getString(2)));
            outlet.setOCode(cursor.getString(3));
            // Adding outlet to list
            outletlist.add(outlet);
        } while (cursor.moveToNext());
    }

    // return outlet list
    return outletlist;
}

Answer 1

您可以通过创建数组适配器来实现，如下所示

// Spinner element
    Spinner spinner = (Spinner) findViewById(R.id.spinner);

    // Spinner Drop down elements
    List<String> outletNames = new ArrayList<String>;();
    List<Outlet> outlets = getAllOutlet();
    for(Outlet outlet: outlets){
         outletNames.add(outlet.getOutletname);
    }

    // Creating adapter for spinner
    ArrayAdapter<String> dataAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_item, outletNames);

    // attaching data adapter to spinner
    spinner.setAdapter(dataAdapter);

或者，如果您希望使用自定义视图进行更好的自定义，请创建自己的适配器以扩展ArrayAdapter。如果遇到问题，也可以按照本教程进行操作 Android populating Spinner data from SQLite database

SQLite数据到Spinner

1 个答案: