如何按值而不是按位置设置 Spinner 的选定项目? [英] How to set selected item of Spinner by value, not by position?

问题描述

我有一个更新视图，我需要在其中为微调器预先选择存储在数据库中的值.

I have a update view, where I need to preselect the value stored in database for a Spinner.

我想到了这样的事情，但是 Adapter 没有 indexOf 方法，所以我被卡住了.

I was having in mind something like this, but the Adapter has no indexOf method, so I am stuck.

void setSpinner(String value)
{
    int pos = getSpinnerField().getAdapter().indexOf(value);
    getSpinnerField().setSelection(pos);
}

推荐答案

假设你的 Spinner 被命名为 mSpinner，并且它包含作为它的选择之一:some value".

Suppose your Spinner is named mSpinner, and it contains as one of its choices: "some value".

要查找和比较 Spinner 中某个值"的位置，请使用以下命令:

To find and compare the position of "some value" in the Spinner use this:

String compareValue = "some value";
ArrayAdapter<CharSequence> adapter = ArrayAdapter.createFromResource(this, R.array.select_state, android.R.layout.simple_spinner_item);
adapter.setDropDownViewResource(android.R.layout.simple_spinner_dropdown_item);
mSpinner.setAdapter(adapter);
if (compareValue != null) {
    int spinnerPosition = adapter.getPosition(compareValue);
    mSpinner.setSelection(spinnerPosition);
}

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