EditTextPreference Disable Buttons?

问题:

I want to have an EditTextPreference that will disable the OK button if there is no text in the EditText field. I created a custom EditTextPreference class and I am able to get the EditText object and set a TextWatcher, but I can't find a way to disable the button. It looks like I just don't have access to the OK and Cancel buttons in the Dialog.

Anyone know a way to get at these buttons or to do what I am trying to do?

Only other option is to try to create from scratch a custom Dialog that looks like and mimics the EditTextPreference.

回答1:

Here is a code sample that enables/disables button depending on whether onCheckValue function returns true or false.

public class ValidatedEditTextPreference extends EditTextPreference
{
    public ValidatedEditTextPreference(Context ctx, AttributeSet attrs, int defStyle)
    {
        super(ctx, attrs, defStyle);        
    }

    public ValidatedEditTextPreference(Context ctx, AttributeSet attrs)
    {
        super(ctx, attrs);                
    }

    private class EditTextWatcher implements TextWatcher
    {    
        @Override
        public void onTextChanged(CharSequence s, int start, int before, int count){}

        @Override
        public void beforeTextChanged(CharSequence s, int start, int before, int count){}

        @Override
        public void afterTextChanged(Editable s)
        {        
            onEditTextChanged();
        }
    }
    EditTextWatcher m_watcher = new EditTextWatcher();

    /**
     * Return true in order to enable positive button or false to disable it.
     */
    protected boolean onCheckValue(String value)
    {        
        return Strings.hasValue(value);
    }

    protected void onEditTextChanged()
    {
        boolean enable = onCheckValue(getEditText().getText().toString());
        Dialog dlg = getDialog();
        if(dlg instanceof AlertDialog)
        {
            AlertDialog alertDlg = (AlertDialog)dlg;
            Button btn = alertDlg.getButton(AlertDialog.BUTTON_POSITIVE);
            btn.setEnabled(enable);                
        }
    }

    @Override
    protected void showDialog(Bundle state)
    {
        super.showDialog(state);

        getEditText().removeTextChangedListener(m_watcher);
        getEditText().addTextChangedListener(m_watcher);
        onEditTextChanged();
    }    
}

回答2:

need change the old EditTextPreference to the new ValidatedEditTextPreference in preference.xml.

I did the following:

Old code:

<EditTextPreference
    android:dialogMessage="Please input your email"
    android:dialogTitle="Set email"
    android:key="Email"
    android:summary="Your email"
    android:title="-Missed call send to" android:defaultValue="[e-mail]"/>

New code:

<com.tanggod.missedcall2mail.ValidatedEditTextPreference
    android:dialogMessage="Please input your email"
    android:dialogTitle="Set email"
    android:key="Email"
    android:summary="Your email"
    android:title="-Missed call send to" android:defaultValue="[e-mail]"/>