AlertDialog不起作用

Question

@Override
protected Dialog onCreateDialog(int id) {
    switch (id) {
        case IDD_COLOR:
            return new AlertDialog(this); // The constructor AlertDialog(context) is not visible
    }

    return null;
}

Why? What's wrong?

Answer 1

You cannot create an AlertDialog as it has a protected constructor, you can make AlertDialog 's by using AlertDialog.Builder .

More information on that subject.

Answer 2

The constructor AlertDialog(Context context) is protected , and is only visible to its class, sub-classes and classes within the same package.

See this link for how to create an AlertDialog :

• Creating an AlertDialog

Answer 3

please use AlertDialog.Builder , like:

AlertDialog.Builder builder = new AlertDialog.Builder(a)
        .setCustomTitle(buildAlertTitle(a, title, 18))
        .setMultiChoiceItems(choices, checkedChoices, multiChoiceClickListener)
        .setPositiveButton(okButtonLabel, okButtonClickListener)
        .setNegativeButton(cancelButtonLabel, cancelButtonClickListener);

AlertDialog alert = builder.create(); // create one

alert.show(); //display it 

For more information, please use Google "android AlertDialog.Builder sample"
BR shawn