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
}

这些答案都没有给我答案，只有这个:

mySpinner.post(new Runnable() {
    @Override
    public void run() {
        mySpinner.setSelection(position);
    }
});

我有一个SimpleCursorAdapter，所以我必须复制在这篇文章中使用响应的数据。所以，我建议你试试这个方法:

for (int i = 0; i < spinnerRegion.getAdapter().getCount(); i++) {
    if (spinnerRegion.getItemIdAtPosition(i) == Integer
        .valueOf(signal.getInt(signal
            .getColumnIndexOrThrow("id_region")))) {
        spinnerRegion.setSelection(i);
        break;
    }
}

我认为这是一个真正的方法

找到一个值并选择它:

private void selectValue(Spinner spinner, Object value) {
    for (int i = 0; i < spinner.getCount(); i++) {
        if (spinner.getItemAtPosition(i).equals(value)) {
            spinner.setSelection(i);
            break;
        }
    }
}

为什么不使用数据库中的值并将它们存储在数组列表中，然后使用:

yourSpinner.setSelection(yourArrayList.indexOf("Category 1"));

Some explanation (at least for Fragments - never tried with pure Activity). Hope it helps someone to understand Android better. Most popular answer by Arun George is correct but don't work in some cases. The answer by Marco HC uses Runnable wich is a last resort due to additional CPU load. The answer is - you should simply choose correct place to call to setSelection(), for example it works for me: @Override public void onResume() { super.onResume(); yourSpinner.setSelection(pos); } But it won't work in onCreateView(). I suspect that is the reason for the interest to this topic. The secret is that with Android you can't do anything you want in any method - oops:( - components may just not be ready. As another example - you can't scroll ScrollView neither in onCreateView() nor in onResume() (see the answer here)