安卓下拉框鍵值對

原創

AmazingJ

2020-02-22 00:15

安卓中的下拉框不像html那樣，我們在使用的時候有鍵值對存放的需求網上查了好多說是需要自定義SpinnerAdapter

但是有個方法是不需要的

1：將Key和Value放在一個class中

public class SpinnerArea {

    //這裏將domaincode作爲Key，將domainname作爲Value
    private int domaincode;
    private String domainname;
    
    public SpinnerArea() {
        this.domaincode = 0;
        this.domainname = "";
    }
    public SpinnerArea(int domaincode, String domainname) {
        this.domaincode = domaincode;
        this.domainname = domainname;
    }
    public int getDomaincode() {
        return domaincode;
    }
    public void setDomaincode(int domaincode) {
        this.domaincode = domaincode;
    }
    public String getDomainname() {
        return domainname;
    }
    public void setDomainname(String domainname) {
        this.domainname = domainname;
    }

//這裏纔是重點，將toString的返回值返回value
    @Override
    public String toString() {
        return domainname;
    }
    
}

2：在activity中定義adapter

private ArrayAdapter<SpinnerArea> areadapter;

3：往Adapter中塞值

List<SpinnerArea> spinnerinfo = new ArrayList<SpinnerArea>();
        SpinnerArea sa1 = new SpinnerArea(1,"北京");
        SpinnerArea sa2 = new SpinnerArea(2,"上海");
        spinnerinfo.add(sa1);
        spinnerinfo.add(sa2);
	areadapter =  new ArrayAdapter<SpinnerArea>(this,
 android.R.layout.simple_spinner_item, spinnerinfo);

4：取值

    private OnItemSelectedListener arealistener = new OnItemSelectedListener() {

        @Override
        public void onItemSelected(AdapterView<?> arg0, View arg1,
                int position, long arg3) {
            SpinnerArea sa = (SpinnerArea)arg0.getAdapter().getItem(position);
            Log.v(TAG, String.valueOf(sa.getDomaincode()));
        }

        @Override
        public void onNothingSelected(AdapterView<?> arg0) {

        }

    };

OK,完成