单击另一个项目/小部件可展开/打开微调器?

问题描述

当用户单击另一个按钮时，我正在尝试扩展微调器.例如:当用户单击确定"按钮而不从微调器中选择任何值时，我有一个带值的微调器和一个确定"按钮，微调器会自行扩展.是否有可能获得一个事件来扩展微调器，而无需在微调器上进行用户交互.

I am trying to expand a Spinner when user click on another Button. as example : I have a Spinner with values and a 'OK' button when user click on 'ok' buttton without selecting any value from spinner, Spinner expands itself.Is this possible to get a event to expand spinner without user interaction on spinner.

推荐答案

只需调用Spinner.performClick()即可展开Spinner，而无需用户干预...

Just call Spinner.performClick() to expand Spinner without user interaction...

    final Spinner spinner = (Spinner) findViewById(R.id.spinner);
    Button okButton = (Button) findViewById(R.id.yesButton);
    okButton.setOnClickListener(new View.OnClickListener() {

        @Override
        public void onClick(View v) {
            if(spinner.getSelectedItem() == null) { // user selected nothing...
                spinner.performClick();
            }
        }
    });

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