如何在使用AlertDialog创建DialogFragment时禁用“确定/取消”按钮? 我尝试调用myAlertDialogFragment.getDialog(),但即使显示片段,它也总是返回null
public static class MyAlertDialogFragment extends DialogFragment {
public static MyAlertDialogFragment newInstance(int title) {
MyAlertDialogFragment frag = new MyAlertDialogFragment();
Bundle args = new Bundle();
args.putInt("title", title);
frag.setArguments(args);
return frag;
}
@Override
public Dialog onCreateDialog(Bundle savedInstanceState) {
int title = getArguments().getInt("title");
return new AlertDialog.Builder(getActivity())
.setIcon(R.drawable.alert_dialog_icon)
.setTitle(title)
.setPositiveButton(R.string.alert_dialog_ok,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
((FragmentAlertDialog)getActivity()).doPositiveClick();
}
}
)
.setNegativeButton(R.string.alert_dialog_cancel,
new DialogInterface.OnClickListener() {
public void onClick(DialogInterface dialog, int whichButton) {
((FragmentAlertDialog)getActivity()).doNegativeClick();
}
}
)
.create();
}
}
我知道我可以通过膨胀包含取消和确定按钮的布局来实现它,但我宁可使用AlertDialog解决方案
答案 0 :(得分:25)
将AlertDialog附加到变量:
AlertDialog.Builder builder = new AlertDialog.Builder(this);
(initialization of your dialog)
AlertDialog alert = builder.create();
alert.show();
然后从AlertDialog获取按钮并将其设置为禁用/启用:
Button buttonNo = alert.getButton(AlertDialog.BUTTON_NEGATIVE);
buttonNo.setEnabled(false);
它为您提供了在运行时更改按钮属性的机会。
然后返回警报变量。
必须在获取其观点之前显示AlertDialog。
答案 1 :(得分:25)
您需要在DialogFragment中覆盖onStart()并保留对该按钮的引用。然后,您可以使用该引用稍后重新启用该按钮:
Button positiveButton;
@Override
public void onStart() {
super.onStart();
AlertDialog d = (AlertDialog) getDialog();
if (d != null) {
positiveButton = d.getButton(Dialog.BUTTON_POSITIVE);
positiveButton.setEnabled(false);
}
}