Class cast exception: cannot convert from Checkboxpreference to SwitchPreference

Question

I am not able to identify the issue with my code and it seems no one face this kind of issue, so not able to track this in stack overflow.

Exception message:

Caused by: java.lang.ClassCastException: android.preference.CheckBoxPreference cannot be cast to android.preference.SwitchPreference

Code:

private Preference preference;

@Override
protected void onCreate(Bundle savedInstanceState)
{
    super.onCreate(savedInstanceState);
    getSupportActionBar().setDisplayHomeAsUpEnabled(true);
    addPreferencesFromResource(R.xml.settings);
    loadAllViews();
}

private void loadAllViews()
{
   if (VERSION.SDK_INT >= VERSION_CODES.ICE_CREAM_SANDWICH)
   {
        preference = (SwitchPreference) findPreference("preference"); //Exception occurs here.
   }
   else
   {
        preference = (CheckBoxPreference) findPreference("preference");
   }
}

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settings.xml:

<?xml version="1.0" encoding="utf-8"?>
<PreferenceScreen xmlns:android="http://schemas.android.com/apk/res/android" >

    <CheckBoxPreference
        android:key="preference"
        android:title="yes_or_no" />

</PreferenceScreen>

Some one please help me to figure it out.

both your switch and checkbox preferences are named preference. CHange that — Atul O Holic, May 26 '14 at 15:34
Sorry I am not able to understand, please elaborate.. @AtulOHolic — Ashokchakravarthi Nagarajan, May 26 '14 at 15:36
Do u have a layout for your SwitchPreference like you have for your CheckboxPreference like — Atul O Holic, May 26 '14 at 15:40
@down voter. Please tell me, if I am doing anything wrong. or if it is duplicated. — Ashokchakravarthi Nagarajan, May 26 '14 at 15:41
got it.. thanks a lot.. I need to create it.. under xml-v14 directory.. — Ashokchakravarthi Nagarajan, May 26 '14 at 15:45

score 3 · Answer 1 · answered May 26 '14 at 15:34

3

CheckBoxPreference does not extends SwitchPreference; hence it cannot be cast to it. Both of these classes are children of TwoStatePreference.

From your code, it seems that you are referencing one preference key for two different preference components:

  if (VERSION.SDK_INT >= VERSION_CODES.ICE_CREAM_SANDWICH)
   {
        preference = (SwitchPreference) findPreference("preference"); //Exception occurs here.
   }
   else
   {
        preference = (CheckBoxPreference) findPreference("preference");
   }

As you can see, this will work fine for the correct preference type, but it will throw a ClassCastException for the incorrect type. Make sure you are referencing the correct key for the correct TwoStatePreference.

answered May 26 '14 at 15:34

Emmanuel

13,083
4
39
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But either SwitchPreference or CheckBoxPreference will be working at a time. so I hope that won't be an issue. Please Correct me what I am doing wrong. @Emmanuel – Ashokchakravarthi Nagarajan May 26 '14 at 15:39
1

Each preference should have its own key. You should give the `SwitchPreference` one key and `CheckBoxPreference` another key. Keys should be unique. Now you are calling both "preference" – Emmanuel May 26 '14 at 15:40
No problem, glad to help. Please mark this question as answered. – Emmanuel May 26 '14 at 15:47

score 0 · Answer 2 · answered May 26 '14 at 16:10

<?xml version="1.0" encoding="utf-8"?>

<SwitchPreference
    android:key="preference1"
    android:title="yes_or_no" />

<CheckBoxPreference
    android:key="preference2"
    android:title="yes_or_no" />

In the code:

Preference preference;

if (VERSION.SDK_INT >= VERSION_CODES.ICE_CREAM_SANDWICH)
{
preference = (SwitchPreference) findPreference("preference1");
}
else
{
preference = (CheckBoxPreference) findPreference("preference2");
}

score 0 · Accepted Answer · answered Oct 01 '14 at 03:47

0

Need to have two separate layout.

One for check preference at layout directory.

And another for SwitchPreference at layout-v14 directory.

answered Oct 01 '14 at 03:47

Ashokchakravarthi Nagarajan

1,638
2
19
34

Class cast exception: cannot convert from Checkboxpreference to SwitchPreference

3 Answers3