android preference screen inconvertible types

Question

I am trying to create a preferenceScreen with this command

        PreferenceScreen screen= (PreferenceScreen)getPreferenceScreen().findPreference(KEY);

and the error message is: "inconvertible types, cannot cast android.support.v7.preference.Preference to android.preference.preferenceScreen"

Is there a way to fix it? Thanks!

Update: this is part of the testing code I wrote

        ArrayList<String> cmds = new ArrayList<String>() {{
        add("A");
        add("B");
        add("C");
    }};
    for (String cmd : cmds) {
    CheckBoxPreference cpref = new CheckBoxPreference(getActivity().getApplicationContext());
        cpref.setTitle(cmd);
        cpref.setKey("The Name");
        cpref.setChecked(true);
        cmdScr.addPreference(cpref);
    }

now the last line "addPreference" gives me an error

score 0 · Accepted Answer · edited May 23 '17 at 10:34

0

findPreference returns android.support.v7.preference.Preference and not the PreferenceScreen. What you need to do is this:

Preference screen = (Preference) getPreferenceManager().findPreference(KEY);

Where Preference is imported as the one from the support library:

import android.support.v7.preference.Preference;

To answer your edited question, just visit this link to see what you're doing wrong. Add the category to your screen, and then add the preference to the category.

edited May 23 '17 at 10:34

Community

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answered Jun 22 '16 at 13:53

Vucko

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hi @Vucko thanks for your reply. How do I import preference as the one from the support library so that the "screen" I got is a preferenceScreen? – Deidara Jun 22 '16 at 14:15
If you're extending `PreferenceActivity` you can use `getPreferenceManager()` instead of `getPreferenceScreen()` – Vucko Jun 22 '16 at 14:19
I am extending PreferenceFragmentCompat ,could you write an example please? I am kind of new to android. Thanks. – Deidara Jun 22 '16 at 14:26
What is your problem now dude? Is it not working? I wrote you exactly what you need. `PreferenceFragmentCompat ` has the method `getPreferenceManager()`. Use it to find the preference with the key. – Vucko Jun 22 '16 at 14:29
Hi Vucko I was trying to call the addPreference(screen) method after using the code you wrote. – Deidara Jun 22 '16 at 14:40
Did you make it work? I presume that by accepting the answer, you did? – Vucko Jun 22 '16 at 14:43
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@Xia Edited my answer with a link that'll help you. – Vucko Jun 22 '16 at 15:11

android preference screen inconvertible types

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