Question

unitSpinner根据以下选择设置fromSpinner和toSpinner适配器：

unitSpinner.setOnItemSelectedListener(new AdapterView.OnItemSelectedListener() {
        @Override
        public void onItemSelected(AdapterView<?> parent, View view, int position, long id) {
            switch (position) {
                case 0:
                    setUnitSpinnerAdapter(areaHeaders);
                    break;
                .
                .
                .
                case 12:
                    setUnitSpinnerAdapter(volumeHeaders);
                    break;
            }
        @Override
        public void onNothingSelected(AdapterView<?> parent) {
        }
    });

setUnitSpinnerAdapter：

public void setUnitSpinnerAdapter(String[] headers) {
    ArrayAdapter<String> adapter = new ArrayAdapter<>(getActivity(),
            android.R.layout.simple_spinner_item, headers);
    adapterUnits.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
    fromSpinner.setAdapter(adapter);
    toSpinner.setAdapter(adapter);
}

我称之为

unitSpinner.setSelection(getIndex(unitSpinner, cur.getString(1)));
fromSpinner.setSelection(getIndex(fromSpinner, cur.getString(2)));
toSpinner.setSelection(getIndex(toSpinner, cur.getString(3)));

getIndex：

private int getIndex(Spinner spinner, String myString) {
    int index = 0;

    for (int i = 0; i < spinner.getCount(); i++) {
        if (spinner.getItemAtPosition(i).toString().equals(myString)) {
            index = i;
            break;
        }
    }
    return index;
}

fromSpinner和toSpinner适配器设置为新值，因为unitSpinner选择更改但是setSelection对它们不起作用，因为getIndex比较旧适配器并将index返回为0，除非我这样做：

unitSpinner.setSelection(getIndex(unitSpinner, cur.getString(1)));
new Handler().postDelayed(new Runnable() {
                    public void run() {
                         fromSpinner.setSelection(getIndex(fromSpinner, cur.getString(2)));
                         toSpinner.setSelection(getIndex(toSpinner, cur.getString(3)));
                    }
                }, 1000);

这使我的应用程序显得很慢，因为我必须等待1000毫秒才能看到更改。设置较小的等待时间（如100毫秒）并不是每次都有效。我该怎么办？

Answer 1

尝试：

fromSpinnerAdapter.notifdatachanged();

没有postDelayed Runnable，Spinner setSelection（）不起作用

1 个答案: