在Android中设置ListView警报对话框的默认选定项 [英] Set default selected item of ListView Alert Dialog in Android

问题描述

我创建了一个带有自定义ListView的对话框，该对话框模拟了Spinner的显示，并且最初以"Select Gender"值开始.

I have created a dialog with a custom ListView that models a Spinner display, and originally it starts out with the value "Select Gender".

打开对话框时，提示您进行选择(就像微调框一样).如果再次选择该选项，它将显示相同的选项，但并不表示已经选择了哪个选项.

When the dialog opens it prompts for a selection (just like a spinner). If the selection gets selected again, it shows the same options, but doesn't indicate which option has already been selected.

示例:
默认值:选择性别"
对话框打开且没有选择
用户选择:男"
用户重新打开对话框...
对话框打开且没有选择

Example:
Default Value: "Select Gender"
Dialog opens with no selection
User selects: "Male"
User reopens dialog...
Dialog opens with no selection

(我希望选择男性"，因为这是他们的最后选择)

到目前为止，这是我的代码:

Here's my code so far:

genderItems = getResources().getStringArray(R.array.gender_array);
genderAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, genderItems);

genderDrop.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            if(event.getAction() == MotionEvent.ACTION_DOWN) {
                Builder genderBuilder = new AlertDialog.Builder(Register.this)
                    .setTitle(R.string.gender_prompt)
                    .setAdapter(genderAdapter, new DialogInterface.OnClickListener() {
                    public void onClick(DialogInterface dialog, int which) {
                        inputGender.setText(genderItems[which]);
                        dialog.dismiss();
                    }
                });
                AlertDialog genderAlert = genderBuilder.create();
                genderAlert.show();
                genderAlert.getListView().setSelection(0);
            }
            return false;
        }
});

genderAlert.getListView().setSelection(0) 未将所选默认设置设置为男性"
genderAlert.getListView().setSelection(1) 未将所选默认设置设置为女性"

genderAlert.getListView().setSelection(0) doesn't set the default selected as "Male"
genderAlert.getListView().setSelection(1) doesn't set the default selected as "Female"

推荐答案

弄清楚了:

我从.setAdapter切换到.setSingleChoiceItems，其中有一个用于默认选择的参数.然后，我要做的就是创建一个全局变量，每次单击一个选项时都会对其进行设置.全局变量最初设置为-1，因此未选择任何选项，然后在单击某个对象时将其设置为位置，并在下次创建对话框时，该选择反映了我先前的选择.见下文:

I switched from .setAdapter to .setSingleChoiceItems which has an argument for the default selection. Then all I had to do was create a global variable that got set each time I clicked an option. The global variable is initially set to -1 so no option is selected, then once I click on something it gets set to the position and the next time the dialog is created the selection reflects my previous selection. See below:

Integer selection = -1;

genderItems = getResources().getStringArray(R.array.gender_array);
genderAdapter = new ArrayAdapter<String>(this, android.R.layout.simple_spinner_dropdown_item, genderItems);

genderDrop.setOnTouchListener(new View.OnTouchListener() {
        public boolean onTouch(View v, MotionEvent event) {
            if(event.getAction() == MotionEvent.ACTION_DOWN) {
                Builder genderBuilder = new AlertDialog.Builder(Register.this)
                    .setTitle(R.string.gender_prompt)
                    .setSingleChoiceItems(genderAdapter, selection, new DialogInterface.OnClickListener() {
                        public void onClick(DialogInterface dialog, int which) {
                            inputGender.setText(genderItems[which]);
                            selection = which;
                            dialog.cancel();
                        }
                    });
                AlertDialog genderAlert = genderBuilder.create();
                genderAlert.show();
            }
            return false;
        }
});

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