这是我正在使用的Kotlin扩展:

fun Spinner.setItem(list: Array<CharSequence>, value: String) {
    val index = list.indexOf(value)
    this.post { this.setSelection(index) }
}

用法:

spinnerPressure.setItem(resources.getTextArray(R.array.array_pressure), pressureUnit)

使用以下方法: spinnerObject.setSelection (INDEX_OF_CATEGORY2)。

public static void selectSpinnerItemByValue(Spinner spnr, long value) {
    SimpleCursorAdapter adapter = (SimpleCursorAdapter) spnr.getAdapter();
    for (int position = 0; position < adapter.getCount(); position++) {
        if(adapter.getItemId(position) == value) {
            spnr.setSelection(position);
            return;
        }
    }
}

你可以使用上面的方法:

selectSpinnerItemByValue(spinnerObject, desiredValue);

&当然你也可以直接按索引选择

spinnerObject.setSelection(index);

这是我在Kotlin中使用的:

spinner.setSelection(resources.getStringArray(R.array.choices).indexOf("Choice 1"))

  for (int x = 0; x < spRaca.getAdapter().getCount(); x++) {
            if (spRaca.getItemIdAtPosition(x) == reprodutor.getId()) {
                spRaca.setSelection(x);
                break;
            }
        }

我做了一些Spinner的扩展功能，用于加载数据和跟踪项目选择。

Spinner.kt

fun <T> Spinner.load(context: Context, items: List<T>, item: T? = null) {
    adapter = ArrayAdapter(context, android.R.layout.simple_spinner_item, items).apply {
        setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item)
    }

    if (item != null && items.isNotEmpty()) setSelection(items.indexOf(item))
}

inline fun Spinner.onItemSelected(
    crossinline itemSelected: (
        parent: AdapterView<*>,
        view: View,
        position: Int,
        id: Long
    ) -> Unit
) {
    onItemSelectedListener = object : AdapterView.OnItemSelectedListener {
        override fun onNothingSelected(parent: AdapterView<*>?) {
        }

        override fun onItemSelected(parent: AdapterView<*>, view: View, position: Int, id: Long) {
            itemSelected.invoke(parent, view, position, id)
        }
    }
}

每天的例子

val list = listOf("String 1", "String 2", "String 3")
val defaultData = "String 2"

// load data to spinner
your_spinner.load(context, list, defaultData)

// load data without default selection, it points to first item
your_spinner.load(context, list)

// for watching item selection
your_spinner.onItemSelected { parent, view, position, id -> 
    // do on item selection
}