Question

我有一个带有四个微调器的活动，这些微调器是从数据库中填充的。您可以选择不同车辆的属性。让我们说我们可以选择品牌，然后马力等等。首先我想测试，如果我点击一个微调器时得到一个值，但我总是得到光标值，而不是我点击旋转器（例如本田，宝马）。我正在寻找几天，我也知道我需要像“getString（）”或/和“selectedItem”这样的东西。但遗憾的是，我仍然无法解决问题。我想，例如点击微调项目“本田”，吐司信息应显示“本田”。我希望有人可以告诉我，我必须把必要的代码放在哪里。我在光标内和下方试了一下。这是我的代码。谢谢： - ）

public class ChooseCar extends Activity {

private Spinner BrandSpinner, HorsePowerSpinner, FuelSpinner, TireSpinner;
private Button btnSearch;
protected Cursor cursor;
protected ListAdapter adapter;
protected EditText searchText;
protected SQLiteDatabase db;

SQLiteDatabase myDB = null;
final static String MY_DATABASE_NAME = "car_directory";
final static String MY_DATABASE_TABLE = "cars";

public void onCreate(Bundle savedInstanceState) {
    super.onCreate(savedInstanceState);

    setContentView(R.layout.car_choice);

    LoadBrandSpinner();
    LoadHorsePowerSpinner();
    LoadFuelSpinner();
    LoadTireSpinner();
    addListenerOnButton();

}



public void LoadBrandSpinner(){
    myDB = this.openOrCreateDatabase(MY_DATABASE_NAME, MODE_PRIVATE, null);

    Cursor myCursor = myDB.rawQuery("SELECT _id, brand FROM " + MY_DATABASE_TABLE + ";", null);        
    startManagingCursor(myCursor);

    BrandSpinner = (Spinner)findViewById(R.id.spinner1);

    myCursor.moveToFirst();


   SimpleCursorAdapter spinadapter = new SimpleCursorAdapter(
            this,
            android.R.layout.simple_spinner_item,
            myCursor,
            new String[] {"brand"},
            new int[] {android.R.id.text1}); 

    spinadapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    BrandSpinner.setAdapter(spinadapter);
    BrandSpinner.setPrompt(this.getResources().getString(R.string.ChooseBrand)); 
    BrandSpinner.setAdapter(spinadapter);
    BrandSpinner.setOnItemSelectedListener(new MyOnItemSelectedListener());
}


public void LoadHorsePowerSpinner(){// The same like the first spinner ;-)}

public void LoadFuelSpinner(){// The same like the first spinner ;-)}

public void LoadTireSpinner(){// The same like the first spinner ;-)}

public class MyOnItemSelectedListener implements OnItemSelectedListener {

public void onItemSelected(AdapterView<?> parent,
    View view, int pos, long id) {
  Toast.makeText(parent.getContext(), "The car is " +
      parent.getItemAtPosition(pos).toString(), Toast.LENGTH_LONG).show();
}

public void onNothingSelected(AdapterView parent) {
  // Do nothing.
}
}

public void addListenerOnButton() {

BrandSpinner = (Spinner) findViewById(R.id.spinner1);
HorsePowerSpinner = (Spinner) findViewById(R.id.spinner2);
FuelSpinner = (Spinner) findViewById(R.id.spinner3);
TireSpinner = (Spinner) findViewById(R.id.spinner4);

btnSearch = (Button) findViewById(R.id.searchButton);

btnSearch.setOnClickListener(new OnClickListener() {

    public void onClick(View v) {

        Toast.makeText(ChooseCar.this,
                "OnClickListener : " + 
                "\nBrand : " +   String.valueOf(BrandSpinner.getSelectedItem()) +
                "\nHorsePower : " + String.valueOf(HorsePowerSpinner.getSelectedItem()) +
                "\nFuel : " + String.valueOf(FuelSpinner.getSelectedItem()) +
                "\nTire : " + String.valueOf(TireSpinner.getSelectedItem()),
                Toast.LENGTH_SHORT).show();
    }

});
}}

Answer 1

将MyOnItemSelectedListener设置为微调器的OnItemSelectedListener是正确的。

在onItemSelected的{{1}}方法中，您应该可以致电MyOnItemSelectedListener，它会为您提供所选品牌的parent.getSelectedItem()对象。

获得Cursor后，请执行

Cursor

检索汽车品牌。

Answer 2

    appCompatSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
                @Override
                public void onItemSelected(AdapterView<?> adapterView, View view, int i, long l) {
                    Toast.makeText(context, String.valueOf(((AppCompatTextView) view).getText()), Toast.LENGTH_LONG).show();
                }

                @Override
                public void onNothingSelected(AdapterView<?> adapterView) {
                    Toast.makeText(context, "NothingSelected!", Toast.LENGTH_SHORT).show();
                }
            });

无法获取单击的微调器项的值，而是获取游标值

2 个答案: